73 m2 (median per year 6; IQR 3–10) was different from that in pa

73 m2 (median per year 6; IQR 3–10) was different from that in patients with normal eGFR (median per year 6; IQR 2–10; Wilcoxon P-value=0.12). The most frequently used NRTI pairs were tenofovir/emtricitabine (24%) and zidovudine/lamivudine (22%); 48% of the person-years of follow-up Everolimus mouse (PYFU) was spent on an NNRTI-containing regimen, 28%

on a ritonavir-boosted PI-containing regimen (not including indinavir) and 11% on a single-PI-containing regimen (not including indinavir) (Table 3). Over 1412 person years of follow-up (PYFU) while patients were receiving at least one antiviral drug, we observed 96 events (confirmed eGFR decrease ≥20% from pre-cART levels), resulting in a crude incidence rate of 6.8 per 100 PYFU (95% CI 5.5–8.2). Factors independently associated with a ≥20% decrease in eGFR were female gender [relative risk (RR)

2.25 vs. male; 95% CI 1.32–3.84] and older age (RR 1.41 per 10 years older; 95% CI 1.11–1.79); compared with patients treated with zidovudine/lamivudine, those currently receiving tenofovir/emtricitabine (RR 4.78; 95% CI 2.19–10.43), tenofovir/lamivudine (RR 4.20; 95% CI 1.95–9.02) or didanosine/emtricitabine (RR 11.88; 95% CI 2.27–62.18) appeared to be at increased risk of a decrease in eGFR. Similarly, patients on a PI-containing cART (even after exclusion of indinavir) were at increased risk compared with those receiving NNRTI-containing ART (RR 3.18; 95% CI 1.62–6.23 if on an old, single-PI regimen and RR 2.15; 95% CI 1.25–3.70 if on a ritonavir-boosted regimen),

mTOR inhibitor although, interestingly, patients receiving NRTIs alone were those at the highest risk (RR 9.39; 95% CI 1.79–49.42; Table 4). After controlling for the most recent CD4 cell count and viral load (as opposed to the baseline values), results were similar; in addition to the confirmed association with female gender and age, the following RR values were estimated for the comparison of NRTI pairs to zidovudine/lamivudine: tenofovir/emtricitabine, RR 4.86 (95% CI 2.28–10.34); tenofovir/lamivudine, RR 4.64 (95% CI 2.22–9.68), and didanosine/emtricitabine, learn more RR 7.68 (95% CI 1.52–38.66); and for the third drug class compared to NNRTIs: RR 4.33 (95% CI 2.24–8.35) for a single PI; RR 2.46 (95% CI 1.48–4.08) for PIs/r, and RR 11.9 (95% CI 2.09–67.48) for NRTIs alone. Results were similar in sensitivity analyses using the alternative cut-offs of 10% and 30% reductions from pre-cART levels (data not shown). In 437 patients who had a value of eGFR >90 mL/min/1.73 m2 at the time of starting cART (68% of the total 644 who started cART), the median eGFR value was 109 mL/min/1.73 m2 (IQR 99–121 mL/min/1.73 m2). In this subset, we observed 104 patients who experienced a decrease in eGFR to a value of <90 mL/min/1.73 m2 over a total of 846 PYFU for a crude incidence rate of 12.3 per 100 PYFU (95% CI 10.2–14.7).

In our diabetes service, we did not receive any funding from loca

In our diabetes service, we did not receive any funding from local health care organisations for psychology services, so we introduced a counselling service for people with type 1 diabetes, using charitable funds, and other money raised by our staff. Our aim was to see if we could address the reportedly higher levels of anxiety in people with diabetes,3 and whether this would be associated with better glycaemic control. We evaluated this new service to assess the effects of the counselling course on glycaemic control, and on the psychological well-being selleck of people who attended. The service is available for all people with type 1 diabetes,

with most referrals to the counsellor coming from other health care professionals in our diabetes service. When counselling is discussed with the person, we make it clear that any issue of concern can be discussed (not only diabetes-related subjects) and that it is entirely confidential, with the counsellor simply informing the referrer of the patient’s attendance (or not!) without divulging any details of what was discussed. Each person receives a six-week course of 50-minute one-to-one sessions with a qualified and experienced counsellor. The style of counselling used within the service is an integrative

approach with a person-centred background, which enables the counsellor to adapt Tanespimycin solubility dmso the style offered depending on the individual and the issues that they are presenting. Person-centred counselling is used with all those who attend the course and offers a non-judgemental approach where they are encouraged to talk freely about their anxieties and fears.5 No judgement is offered as to whether they are right or wrong and not the time is used to enable the person to explore their thoughts

and feelings and to establish their wants and needs. This style of counselling facilitates reflection about self-care or risk taking, such as the occasional omission of medication. Transactional analysis6 is frequently used with people during the course, as it helps the individual to focus on their ability to change their self-management decisions, and focuses on clear goals. This theory in itself is integrative as it incorporates elements of psychoanalytic, person-centred and cognitive approaches, explaining how people function and express their personality in their behaviour. Creative methods are also used within the counselling. An example of this is when the person is requested to choose a picture to reflect their relationship with their diabetes as it is today and how they would like it to be, thus helping the individual to describe their feelings about their diabetes without the use of words. This may be enlightening to the person with diabetes and can offer an insight into how they may be struggling with this all-encompassing illness.

At follow-up, telephone or postal administration was used if face

At follow-up, telephone or postal administration was used if face-to-face was not possible. The questionnaire included the Maudsley Addiction Profile (MAP)[15] and a treatment satisfaction questionnaire.[16] The MAP is a validated tool,[15] which covers substance use, risky injecting behaviour, health symptoms, personal and social functioning over the last 30 days. At follow-up, patients were asked for feedback about interactions with pharmacists. Patients were considered to be retained in treatment if they were Selleckchem Fulvestrant still receiving

treatment from the same or another pharmacy or elsewhere (e.g. a clinic). Where necessary, local specialist pharmacists helped identify patients who had moved pharmacy, were no longer in treatment or were in prison. Patients were not told whether their pharmacy was an intervention or control pharmacy. The sample size calculation was informed by the National Treatment Outcome Research Study (NTORS), a UK cohort GDC-0199 manufacturer study in which regular heroin use of those in a community methadone programme had a mean reduction of 15% over 6 months.[17] To detect an estimated further 12% difference in illicit heroin use, 540 patients were required. Assuming 25% loss to follow-up, 720 recruited patients were needed (approximately 10 per pharmacy). Since this is a cluster RCT,

the sample size calculation was inflated to correct for variability within and between pharmacies using the intra-cluster correlation coefficient (ICC). Since no reliable published ICC estimate for illicit heroin use was available, a conservative estimate of 0.01

was used. Demographic data were stored in an Access database. Statistical analyses were performed using IBM SPSS Statistics version 17.0.3 (Armonk, NY, USA) and Statistical Analysis System (SAS) version 9 (Cary, NC, USA). Analysis of patient data was restricted to those who had completed baseline and follow-up questionnaires Molecular motor with the exception of retention in treatment. Descriptive statistics of baseline demographics were calculated stratified by group. Descriptive statistics for the outcomes were presented by treatment group. Within-group changes between baseline and follow-up were assessed using McNemar’s test for binary outcomes and Wilcoxon signed-rank test for continuous outcomes. Differences between the intervention and control at follow-up were compared using generalised linear mixed models, with randomisation fitted as a fixed effect and the pharmacy the patient was recruited from, fitted as a random effect, adjusting for baseline measures. Further adjustments were made for patient’s age, gender, and length of treatment prior to recruitment. For binary outcomes, odds ratios (ORs) and their 95% confidence intervals (CIs) were reported. For continuous outcomes, parameter estimates and their 95% CIs were reported.

Local perfusion of immepip into the TMN increased, and thioperami

Local perfusion of immepip into the TMN increased, and thioperamide decreased, histamine levels in the TMN but not in the PFC. Local perfusion of immepip into the PFC, however, decreased extracellular histamine levels in both TMN and PFC. It can be concluded that brain H3 receptors, and especially those expressed in the PFC, play an important role in the autoregulation of histamine neurotransmission. It is possible that H3 receptors in the PFC are expressed on pyramidal neurons projecting to the TMN, and activation of these receptors diminishes

glutamate excitatory input from PFC to the TMN. As the brain histamine system has a role in pathophysiology of psychotic, affective, cognitive, sleep and eating disorders, click here H3 receptors are potential targets for future CNS medications. ”
“Previous studies have demonstrated that humans are sometimes capable of initiating arm movements towards visual stimuli at extremely short latencies, implying the presence

of a short-latency neural pathway linking visual input to limb motor output. However, little is known about the neural mechanisms that underlie such hastened arm responses. One clue may come from recent demonstrations that the appearance of a visual target can elicit a rapid response in neck muscles that is time-locked to target appearance and functionally http://www.selleckchem.com/products/Trichostatin-A.html relevant for orienting gaze (head and eye) towards the target. Because oculomotor structures thought to contribute to ‘visual responses’ on neck muscles also target some arm muscles via a tecto-reticulo-spinal pathway, we hypothesized that a similar visual response would be present in arm muscles.

Our results were consistent with this hypothesis as we observed the presence of rapid arm muscle activity (< 100 ms latency) that was time-locked to target appearance and not movement onset. We further found that the visual response in arm muscles: (i) was present only when an immediate reach towards the target was required; (ii) had a magnitude that was predictive of reaction time; (iii) was tuned PAK5 to target location in a manner appropriate for moving the arm towards the target; and (iv) was more prevalent in shoulder muscles than elbow muscles. These results provide evidence for a rapid neural pathway linking visual input to arm motor output and suggest the presence of a common neural mechanism for hastening eye, head and arm movements. ”
“We have previously shown that mice lateral superior olive (LSO) neurons exhibit a large hyperpolarization-activated current (Ih), and that hyperpolarization-activated cyclic-nucleotide-gated type 1 channels are present in both the soma and dendrites of these cells. Here we show that the dendritic Ih in LSO neurons modulates the integration of multiple synaptic inputs.

, 2006; Abram et al, 2008; O’Byrne & Karatzas, 2008), thus it se

, 2006; Abram et al., 2008; O’Byrne & Karatzas, 2008), thus it seemed logical to mTOR inhibitor assess if SigB function contributed to the development of L. monocytogenes GASP. When examined for long-term survival in culture, a ΔsigB mutant exhibited the expected death and long-term stationary growth phases during the course of a 12-day incubation in BHI at 37 °C (Fig. 4a). Similar to the prfA* mutant, ΔsigB long-term stationary phase cultures exhibited final stable bacterial CFU numbers that were approximately twofold lower than those maintained by wild-type L. monocytogenes (Fig. 4a). SigB is thus

required for the optimal fitness of L. monocytogenes during the long-term stationary growth phase. ΔsigB mutant bacteria from 12-day-old cultures were added to 1-day-old mutant cultures at a final ratio of 1 : 100. Over 10 days, bacteria from the 12-day-old culture outcompeted bacteria of the 1-day-old culture such that the ratio at day 10 was 1 : 1 (Fig. 4b), indicating that the ΔsigB mutant

retained its ability to express the GASP phenotype. However, similar to the phenotype expressed by the prfA* mutant, the GASP phenotype exhibited by the ΔsigB strain was not as robust as that exhibited by wild-type L. monocytogenes (Fig. 4b). Although bacteria derived from 12-day-old wild type cultures increased 1000-fold in comparison to 1-day-old wild-type bacteria Trametinib datasheet (Fig. 4b), the bacterial numbers of a 12-day-old ΔsigB culture increased approximately 100-fold in comparison to those of the 1-day-old ΔsigB culture (Fig. 4b). Similar to the situation described above for prfA* strains, the failure of the ΔsigB mutant to express a robust GASP phenotype could reflect an impaired ability to develop GASP or may indicate that the loss of SigB contributed to a partial GASP phenotype for 1-day-old cultures. To distinguish between these two possibilities, the CI between wild type 12-day-old cultures and 1-day-old wild type or ΔsigB cultures was assessed. If the ΔsigB mutant expresses a partial GASP phenotype as the

result of the loss of SigB, then the competitive advantage of a wild-type 12-day-old culture should be less in comparison to 1-day-old ΔsigB than in comparison to for 1-day-old wild type. Interestingly, the difference in the competitive advantage of wild-type 12-day-old cultures observed vs. 1-day-old wild-type or 1-day-old ΔsigB was minimal (Fig. 4c). SigB contributes to L. monocytogenes fitness in broth culture, based on the competitive advantage of 1-day-old wild-type strains vs. 1-day-old ΔsigB mutants (Fig. 4c). Thus, in spite of ΔsigB mutants exhibiting a broth culture fitness defect, the overall magnitude of the competitive defect observed between 12-day-old wild-type L. monocytogenes and 1-day-old wild-type strains and ΔsigB mutants was similar rather than exacerbated for ΔsigB, suggesting that the loss of SigB may indeed contribute to the development of the GASP phenotype. Taken together, these data indicate a role for SigB in L.


“International Journal of Paediatric Dentistry 2012; 22: 2


“International Journal of Paediatric Dentistry 2012; 22: 232–238 Aims.  This study

was conducted to examine the nature, content, and duration of advertisements broadcasted during children’s Tamil television channels and to determine the extent to which television advertising changes during http://www.selleckchem.com/products/KU-60019.html school holiday and non-holiday periods and between prime time and non-prime time broadcast. Methods.  Television broadcasts on two main children’s Tamil television channels were video-recorded over 16 days between 17.00–19.00 hours (non-prime time) and 19.00–21.00 hours (prime time). For each commercial, the type of product advertised, as well as the duration (in seconds), was recorded. Advertisements were categorized as ‘food’ and ‘non-food’. The former category was further subdivided into ‘sugar-rich foods’ and ‘other foods’. The sugar-rich foods were further categorized as liquid, solid and sticky, and slowly dissolving sugars. Commercials related to the promotion of oral health products and non-food products were also recorded. Results.  Among the total of 128 h of television programmes recorded, Selleckchem BEZ235 advertising accounted for

10.15% (13.01 hours). The advertisement of sugar-rich food products, non-food and oral hygiene products occupied 50.36%, 38.41% and 1.90%, respectively, of the total advertising time. Solid and sticky products made up 100% of advertisements in this category on Chithiram television channel, compared with 62.5% of advertisements on Chutti television channel. Conclusion.  It was concluded that the advertising of sugar-rich foods, particularly solid and sticky food products, was broadcasted more in Chithiram television channel, during school holidays and during prime time. ”
“International Journal of Paediatric Dentistry 2011; 22: 60–67 Background.  About 11% of children and adolescents suffer from dental fear.

These young people run an increasing risk of undergoing more invasive treatments. Aim.  We researched the management of dental anxiety in young triclocarban patients by general and paediatric dentists as well as by trained and untrained dentists. Design.  Eight hundred dentists in Germany were interviewed via e-mail regarding their experience, treatment techniques, information material and complications during the treatment of fearful children. We also examined how difficult dentists judge the treatment of anxious children and how often they participate in continuing education courses. Results.  Paediatric dentists applied a greater spectrum of management techniques than general dentists. They used more often psychotherapeutic interventions and anxiety assessment questionnaires. Dentists who frequently attend in continuing education courses judged the treatment to be less difficult and also used psychotherapeutic interventions more often. Conclusions.

Rifampicin reduces the concentration of ritonavir-boosted proteas

Rifampicin reduces the concentration of ritonavir-boosted protease inhibitors [61], risking loss of HIV virological control. Rifampicin and saquinavir/ritonavir coadministration can cause severe hepatocellular toxicity and is contraindicated [62]. There is insufficient evidence on the safety of rifabutin in pregnancy to recommend its use, but if reduced dose rifabutin (150 mg on alternate days or three times per week) is used with lopinavir/ritonavir, therapeutic drug monitoring should be used to monitor lopinavir levels in the pregnant woman. Rifampicin and efavirenz can be coadministered,

but because of the concern of teratogenic effects of efavirenz in pregnancy it should be used with caution. There is increasing experience to suggest it can be considered after the first trimester. CHIR-99021 purchase For those already on a regimen containing efavirenz, this should be continued, with dose alterations according to maternal weight and therapeutic drug monitoring. Another option would be to use a triple nucleoside regimen for pregnant RG7422 ic50 women requiring anti-tuberculous therapy. Alternatively AZT

monotherapy and planned caesarean section could be considered for those with an HIV VL <10 000 copies/mL and able to discontinue antiretroviral therapy following delivery. Advice on drug interactions with antiretroviral therapy can be found in Section 11.6. There is limited experience in the management of multi-drug-resistant TB (MDR-TB) during pregnancy and management should be in conjunction with a specialist in this field. Although there is limited experience with many second-line drugs in pregnancy, untreated TB, especially in those infected with HIV, will lead to increased maternal mortality and

poor obstetric outcomes [53–56] and the risk of congenital and neonatal TB. There are a number of reports of the successful management of MDR-TB in pregnancy [63–65]. Pregnant individuals infected with MDR-TB should be transferred to a unit with expertise in this field. Clarithromycin has been associated with birth defects in mice and GABA Receptor rats, but two reviews failed to show an increase in major malformations in 265 women exposed in the first trimester [66,67]. There is no evidence for teratogenicity of azithromycin in animal studies. One hundred and twenty-three women were reported to the teratogenicity service in Toronto, Canada, having taken azithromycin during pregnancy (88 in the first trimester). No increase in malformations was seen when compared to those exposed to a non-teratogenic antibiotic [67]. There are no trial data examining the optimum time to start ART in the context of treating opportunistic infections in pregnancy. However, there is a consensus that in most situations ART should be started as soon as possible. There have not been any publications describing immune reconstitution inflammatory syndrome (IRIS) relating to opportunistic infections in pregnancy for patients on HAART, but this must at least be a theoretical concern.

Over the last 3 years, four of them have required liver transplan

Over the last 3 years, four of them have required liver transplantation for liver failure and portal hypertension [2,3]. Examination of the explants showed a typical aspect of nodular regenerative hyperplasia related to diffuse obliterative

portal venopathy, as shown in Figure 1. Areas of hepatoportal sclerosis (HPS) were also seen in the explants. For this reason, we prefer the term ‘HIV-associated obliterative portopathy’ (HIV-OP), which better describes the syndrome of NCPH in HIV-positive patients than do the terms HPS, nodular regenerative hyperplasia (NRH), and idiopathic portal hypertension that can be found in the literature. All of these terms refer more to the consequence than to the cause of HIV-associated

NCPH [4,5]. In view of these findings, we have Compound C research buy check details screened all of our patients for coagulation abnormalities and found, in an unexpectedly high proportion of patients, a protein S (PS) deficiency [median PS level 56% of normal (IQR 46–59)] secondary to the abnormal presence of anti-PS immunoglobulin G (IgG) neutralizing antibodies [2]. We believe that the accuracy of the use of PS (activity or antigen) to diagnose early HIV-OP should be assessed. As our data suggest a prothrombotic state, use of anticoagulants is also an important issue that should be addressed in a clinical study, as oral anticoagulants OSBPL9 are effective in preventing thrombosis in congenital PS deficiencies.


“A cold shock domain (CSD)-containing protein, CspD, of molecular mass ∼7.28 kDa in a psychrotolerant Antarctic Janthinobacterium sp. Ant5-2 (ATCC BAA-2154) exhibited constitutive expression at 37, 22, 15, 4 and −1 °C. The cspD gene encoding the CspD protein of Ant5-2 was cloned, sequenced and analyzed. The deduced protein sequence was highly similar to the conserved domains of the cold shock proteins (Csps) from bacteria belonging to the class Betaproteobacteria. Its expression was both time- and growth phase-dependent and increased when exposed to 37 °C and UV radiation (UVC, dose: 1.8 and 2.8 mJ cm−2). The results from the electrophoretic mobility shift and subcellular localization study confirmed its single-stranded DNA-binding property. In silico analysis of the deduced tertiary structure of CspD from Ant5-2 showed a highly stable domain-swapped dimer, forming two similar monomeric Csp folds. This study established an overall framework of the structure, function and phylogenetic analysis of CspD from an Antarctic Janthinobacterium sp. Ant5-2, which may facilitate and stimulate the study of CSD fold proteins in the class Betaproteobacteria. Microorganisms isolated from Antarctica are suitable candidates to study physiological and genetic mechanisms for the adaptation to cold and subzero temperatures.


“The public health response to the spread of HIV relies on


“The public health response to the spread of HIV relies on behavioural changes, especially reductions

Fulvestrant cost in sexual and drug-use-related transmission risk behaviours (TRBs). While understanding the factors that dispose people towards risky behaviours is important scientifically, it can be difficult to distil the many predictors of sexual risk behaviours into a useful clinical tool for focused prevention efforts. Our goal was to evaluate the extent to which known predictors of sexual TRBs (self-efficacy, treatment optimism, engagement with medical care, awareness of risky behaviours, substance use, and relevant behavioural and socio-demographic characteristics) combined with additional attitude-related assessments to identify those who had engaged in recent sexual TRBs and may therefore be at risk of additional TRBs. In this study, we analysed data on beliefs and behaviours related to sex, substance use, HIV prevention and other relevant factors for 280 patients at a publicly funded HIV/AIDS clinic in Seattle. All participants completed a baseline audio computer-assisted self interview (ACASI)

as part of a larger trial focused on reducing TRBs. Our multivariate model yielded three screening questions that could prove effective in identifying HIV-positive patients in need of focused prevention resources. The GDC-0199 mouse resulting screener holds promise as a brief and easily deployed tool that can Molecular motor be used by providers regardless of access to ACASI technology. Additional validation is needed and longitudinal evaluation is currently in progress. Approximately 1.3 million individuals in the USA are infected with HIV, which continues to spread at a rate of 40 000 new cases each year [1]. The development of combination antiretroviral therapies has shifted HIV infection into the realm of manageable chronic illness, with the life

expectancies of infected individuals increasing significantly over the past 20 years [2]. However, combination therapies are not yet cures, and, given the absence of an HIV vaccine, the onus for containing the spread of HIV continues to rest in the hands of those already infected (in combination with others at risk for infection). This has, in fact, been the case since the initial discovery and description of HIV, with advocates and activists from the gay community and the substance abuse treatment community promoting and helping to sustain behavioural changes to reduce the spread of HIV. At its heart, the effectiveness of the public health response to the spread of HIV relies on individual behavioural changes. There are, of course, many people who become infected with HIV without having engaged in any high-risk behaviours, but such behaviours [especially related to unprotected sex and injecting drug use (IDU)] are the clearest targets for public health interventions.

In brief, Asp-535, His-538, Glu-542, His-551, Lys-564 and Arg-570

In brief, Asp-535, His-538, Glu-542, His-551, Lys-564 and Arg-570 were altered to alanine with both strands harbouring a mutation in the middle were synthesized and used in PCR. Construct pJSR3 (for endogenous toxic studies) and pJC4 (for protein purification) were used as template to amplify a double-stranded nicked circle using different primers as listed in Table 1 resulting in pD535A, pH538A, pE542A, pH551A, pK564A, pR570A and pJC4(D535A), pJC4(H538A), pJC4(E542A), find more pJC4(H551A), pJC4(K564A), pJC4(R570A), respectively. All the constructs of pBAD were transformed

in E. coli TOP10 resulting in D535A, H538A, E542A, H551A, K564A and R570A strains, and constructs in pET28 were transformed in BL

21 (DE3) pLysS resulting in JC4(D535A), JC4(H538A), JC4(E542A), JC4(H551A), JC4(K564A) and JC4(R570A) strains. All the strains and plasmid used in this study are listed in Table 2. Endogenous toxicity assays were performed AZD5363 in E. coli TOP10, as all the constructs of pBAD were transformed in E. coli TOP10 resulting in D535A, H538A, E542A, H551A, K564A and R570A strains. For endogenous toxicity assay, overnight cultures were diluted 100-fold in fresh medium and grown till log phase [optical density at 600 nm (OD600) = 0.4–0.5] and then diluted again to OD600 = 0.01 in fresh medium with 0.2% l-(+)-arabinose (Sigma, St. Louis, MO). Optical density was monitored at 600 nm using a spectrophotometer.

All cultures were grown at 37 °C in LB medium containing 100 mg of ampicillin mL−1, with continuous shaking of ≥ 225 r.p.m. All the experiments were performed in triplicates, and mean values of three results were used to show the growth in percentage (%) at different interval of time. In vitro RNase degradation assay was performed as per protocol described earlier (Singh & Banerjee, 2008) with purified recombinant wild-type catalytic domain and its all mutant variants. Briefly, RNase activity was measured using total aminophylline bacterial RNA from E. coli strain BL 21(DE3)/pLysS as the substrate. The reaction mixture (20 μL) contained 1.2 μg of RNA in 50 mM Tris–HCl buffer (pH 7.5), 50 mM NaCl, 5 mM EDTA and the protein sample to be tested. After 1.5 h of incubation at 37 °C, 2.5 μL of the loading buffer (40% sucrose, 0.125 M EDTA, 0.5% sodium dodecyl sulfate; pH 8) was added, and the mixture was heated at 95 °C for 2 min and resolved on a 1% agarose gel containing ethidium bromide. Intrinsic tryptophan fluorescence spectra of wild-type catalytic domain and its mutants were measured by Varian spectrofluorometer. Spectra were recorded in 20 mM sodium phosphate buffer at protein concentration of 1 μM using excitation wavelength of 295 nm with excitation and emission slit width set at 5 nm.