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1.  Bacteriophage-Derived Peptidase CHAPK Eliminates and Prevents Staphylococcal Biofilms 
New antibacterial agents are urgently needed for the elimination of biofilm-forming bacteria that are highly resistant to traditional antimicrobial agents. Proliferation of such bacteria can lead to significant economic losses in the agri-food sector. This study demonstrates the potential of the bacteriophage-derived peptidase, CHAPK, as a biocidal agent for the rapid disruption of biofilm-forming staphylococci, commonly associated with bovine mastitis. Purified CHAPK applied to biofilms of Staphylococcus aureus DPC5246 completely eliminated the staphylococcal biofilms within 4 h. In addition, CHAPK was able to prevent biofilm formation by this strain. The CHAPK lysin also reduced S. aureus in a skin decolonization model. Our data demonstrates the potential of CHAPK as a biocidal agent for prevention and treatment of biofilm-associated staphylococcal infections or as a decontaminating agent in the food and healthcare sectors.
doi:10.1155/2013/625341
PMCID: PMC3574654  PMID: 23431312
2.  Normal expiratory flow rate and lung volumes in patients with combined emphysema and interstitial lung disease: A case series and literature review 
Pulmonary function tests in patients with idiopathic pulmonary fibrosis characteristically show a restrictive pattern including small lung volumes and increased expiratory flow rates resulting from a reduction in pulmonary compliance due to diffuse fibrosis. Conversely, an obstructive pattern with hyperinflation results in emphysema by loss of elastic recoil, expiratory collapse of the peripheral airways and air trapping. When the diseases coexist, pulmonary volumes are compensated, and a smaller than expected reduction or even normal lung volumes can be found. The present report describes 10 patients with progressive breathlessness, three of whom experienced severe limitation in their quality of life. All patients showed lung interstitial involvement and emphysema on computed tomography scan of the chest. The 10 patients showed normal spirometry and lung volumes with severe compromise of gas exchange. Normal lung volumes do not exclude diagnosis of idiopathic pulmonary fibrosis in patients with concomitant emphysema. The relatively preserved lung volumes may underestimate the severity of idiopathic pulmonary fibrosis and attenuate its effects on lung function parameters.
PMCID: PMC3267611  PMID: 21969934
Emphysema; Expiratory flow rates; Intersitial lung disease; Lung volumes
3.  In silico modeling of the staphylococcal bacteriophage-derived peptidase CHAPK 
Bacteriophage  2011;1(4):198-206.
The aim of this study was to use comparative modeling to predict the three-dimensional structure of the CHAPK protein (cysteine, histidine-dependent amidohydrolase/peptidase domain of the LysK endolysin, derived from bacteriophage K). Iterative PSI-BLAST searches against the Protein Data Bank (PDB) and nonredundant (nr) databases were used to populate a multiple alignment for analysis using the T-Coffee Expresso server. A consensus Maximum Parsimony phylogenetic tree with a bootstrap analysis setting of 1,000 replicates was constructed using MEGA4. Structural templates relevant to our target (CHAPK) were identified, processed in Expresso and used to generate a 3D model in the alignment mode of SWISS-MODEL. These templates were also processed in the I-TASSER web server. A Staphylococcus saprophyticus CHAP domain protein, 2K3A, was identified as the structural template in both servers. The I-TASSER server generated the CHAPK model with the best bond geometries when analyzed using PROCHECK and the most logical organization of the structure. The predicted 3D model indicates that CHAPK has a papain-like fold. Circular dichroism spectropolarimetry also indicated that CHAPK has an αβ fold, which is consistent with the model presented. The putative active site maintained a highly conserved Cys54-His117-Glu134 charge relay and an oxyanion hole residue Asn136. The residue triplet, Cys-His-Glu, is known to be a viable proteolytic triad in which we predict the Cys residue is used in a nucleophilic attack on peptide bonds at a specific site in the pentaglycine cross bridge of staphylococcal cell wall peptidoglycan. Use of comparative modeling has allowed approximation of the 3D structure of CHAPK giving information on the structure and an insight into the binding and active site of the catalytic domain. This may facilitate its development as an alternative antibacterial agent.
doi:10.4161/bact.1.4.18245
PMCID: PMC3448105  PMID: 23050213
bacteriophage; CHAP; endolysin; in silico; peptidase; staphylococcus
4.  Sulpiride Augmentation for Schizophrenia 
Schizophrenia Bulletin  2010;36(2):229-230.
doi:10.1093/schbul/sbp163
PMCID: PMC2833130  PMID: 20061345
cochrane; sulpiride; schizophrenia
5.  Recombinant bacteriophage lysins as antibacterials 
Bioengineered Bugs  2010;1(1):9-16.
With the increasing worldwide prevalence of antibiotic resistant bacteria, bacteriophage endolysins (lysins) represent a very promising novel alternative class of antibacterial in the fight against infectious disease. Lysins are phage-encoded peptidoglycan hydrolases which, when applied exogenously (as purified recombinant proteins) to Gram-positive bacteria, bring about rapid lysis and death of the bacterial cell. A number of studies have recently demonstrated the strong potential of these enzymes in human and veterinary medicine to control and treat pathogens on mucosal surfaces and in systemic infections. They also have potential in diagnostics and detection, bio-defence, elimination of food pathogens and control of phytopathogens. This review discusses the extensive research on recombinant bacteriophage lysins in the context of antibacterials, and looks forward to future development and potential.
doi:10.4161/bbug.1.1.9818
PMCID: PMC3035150  PMID: 21327123
lysin; endolysin; bacteriophage; pathogen; antibacterial; infection; lytic; enzyme
6.  The truncated phage lysin CHAPk eliminates Staphylococcus aureus in the nares of mice 
Bioengineered Bugs  2010;1(6):404-407.
The endolysin LysK derived from staphylococcal phage K has previously been shown to have two enzymatic domains, one of which is an N-acetylmuramoyl-L-alanine amidase and the other a cysteine/histidine-dependant amidohydrolase/peptidase designated CHAPk. The latter, when cloned as a single-domain truncated enzyme, is conveniently overexpressed in a highly-soluble form. This enzyme was shown to be highly active in vitro against live cell suspensions of S. aureus. In the current study, the IVIS imaging system was used to demonstrate the effective elimination of a lux labeled S. aureus from the nares of BALB/c mice.
doi:10.4161/bbug.1.6.13422
PMCID: PMC3056090  PMID: 21468207
Staphylococcus; decolonization; lysin; bacteriophage; nasal
7.  Nitrofurantoin-associated bronchiolitis obliterans organizing pneumonia: Report of a case 
Bronchiolitis obliterans organizing pneumonia due to nitrofurantoin has rarely been reported and is associated with poor outcomes. A case of nitrofurantoin-associated bronchiolitis obliterans organizing pneumonia responsive to drug withdrawal and corticosteroids is presented.
PMCID: PMC2679562  PMID: 18818785
Bronchiolitis obliterans organizing pneumonia; Nitrofurantoin pulmonary toxicity
8.  Intracerebral abscess: A complication of severe cystic fibrosis lung disease 
Intracerebral abscess is an uncommon complication of severe cystic fibrosis lung disease. The present report describes a case of fatal multiple intracerebral abscesses in a patient with a severely bronchiectatic, nonfunctioning right lung and chronic low-grade infection. The patient was previously turned down for pneumonectomy. Intracerebral abscess in cystic fibrosis and the potential role of pneumonectomy in the present patient are discussed.
PMCID: PMC2677856  PMID: 18292854
Cystic fibrosis; Intracerebral abscess; Pneumonectomy
9.  How to formulate research recommendations 
BMJ : British Medical Journal  2006;333(7572):804-806.
“More research is needed” is a conclusion that fits most systematic reviews. But authors need to be more specific about what exactly is required
doi:10.1136/bmj.38987.492014.94
PMCID: PMC1602035  PMID: 17038740
10.  Gross Domestic Product (GDP) and productivity of schizophrenia trials: an ecological study 
BMC Psychiatry  2003;3:18.
Background
The 5000 randomised controlled trials (RCTs) in the Cochrane Schizophrenia Group's database affords an opportunity to research for variables related to the differences between nations of their output of schizophrenia trials.
Methods
Ecological study – investigating the relationship between four economic/demographic variables and number of schizophrenia RCTs per country. The variable with closest correlation was used to predict the expected number of studies.
Results
GDP closely correlated with schizophrenia trial output, with 76% of the total variation about the Y explained by the regression line (r = 0.87, 95% CI 0.79 to 0.92, r2 = 0.76). Many countries have a strong tradition of schizophrenia trials, exceeding their predicted output. All nations with no identified trial output had GDPs that predicted zero trial activity. Several nations with relatively small GDPs are, nevertheless, highly productive of trials. Some wealthy countries seem either not to have produced the expected number of randomised trials or not to have disseminated them to the English-speaking world.
Conclusions
This hypothesis-generating study could not investigate causal relationships, but suggests, that for those seeking all relevant studies, expending effort searching the scientific literature of Germany, Italy, France, Brazil and Japan may be a good investment.
doi:10.1186/1471-244X-3-18
PMCID: PMC305357  PMID: 14656379

Results 1-12 (12)