Abstract:
AIMS:Haloarchaeal proteases function optimally in high salt (low water activity); thus, they offer an advantage over the nonhalophilic counterparts as biocatalysts for protease-catalysed peptide synthesis. The haloalkaliphilic archaeon Natrialba magadii secretes a solvent-tolerant protease, Nep (Natrialba magadii extracellular protease). In this work, the ability of Nep to catalyse peptide synthesis was examined. METHODS AND RESULTS:The tripeptide Ac-Phe-Gly-Phe-NH(2) was synthesized using Ac-Phe-OEt and Gly-Phe-NH(2) substrates as building blocks in the presence of Nep, 30% (v/v) dimethyl sulfoxide (DMSO) and 1.5 or 0.5 mol l(-1) NaCl. Purification and identification of the peptide product was achieved by RP-HPLC and ESI-MS, respectively. The native as well as the recombinant enzyme produced in Haloferax volcanii (HvNep) was similarly effective as catalysts for the synthesis of this model tripeptide with yields of up to 60% and without secondary hydrolysis of the product. HvNep catalysed the synthesis of various tripeptides with preference for those having aromatic amino acids in the P1 site. CONCLUSION:Nep is able to catalyse peptide synthesis under different salt concentrations in the presence of DMSO. SIGNIFICANCE AND IMPACT OF STUDY:The catalytic property of Nep in peptide synthesis combined with overproduction of this protease in Hfx. volcanii anticipates the potential applicability of this haloarchaeal protease in biotechnology.
journal_name
Lett Appl Microbioljournal_title
Letters in applied microbiologyauthors
Ruiz DM,Iannuci NB,Cascone O,De Castro REdoi
10.1111/j.1472-765X.2010.02955.xsubject
Has Abstractpub_date
2010-12-01 00:00:00pages
691-6issue
6eissn
0266-8254issn
1472-765Xjournal_volume
51pub_type
杂志文章abstract:AIMS:The present study describes the implementation of real-time PCR to tetrathionate broth enrichment step of Salmonella detection in poultry. METHODS AND RESULTS:Real-time PCR with Salmonella invA-specific primers and a standard bacteriological method was applied to detect Salmonella in tetrathionate enrichment cult...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1046/j.1472-765x.2002.01036.x
更新日期:2002-01-01 00:00:00
abstract:AIMS:Aeromonas hydrophila is recognized as a human pathogen following wound exposure or ingestion of contaminated water and food. For rapid identification of this bacterium, a TaqMan-based real-time PCR assay has been developed. METHODS AND RESULTS:Primers and probes that target specific sequences of the 16S rRNA gene...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.2009.02635.x
更新日期:2009-08-01 00:00:00
abstract:AIM:To quantify the influence of trimethylamine-N-oxide (TMAO) on the heat resistance of Escherichia coli K12 MG1655 cells at static temperatures. METHODS AND RESULTS:Stationary-phase E. coli cells were inactivated at 52, 54 and 58°C. The heat resistance is described as reduction in the inactivation rate, k(max) , and...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.2010.02974.x
更新日期:2011-02-01 00:00:00
abstract::A wild type micro-organism producing antibacterial substances has been isolated from a Chinese fermented soybean seasoning and identified as Bacillus subtilis. A crude antibacterial preparation (CABP) was obtained by ammonium sulphate precipitation. Isoelectric focusing assay revealed at least four antimicrobial compo...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1046/j.1365-2672.1999.00545.x
更新日期:1999-05-01 00:00:00
abstract:AIMS:To investigate the use of mannitol salt agar (MSA) supplemented with acriflavine for selective growth and quantification of Staphylococcus aureus from flushed dairy manure wastewater (FDMW). METHODS AND RESULTS:Minimal inhibitory concentrations of acriflavine in MSA were determined by comparing the growth of S. a...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.2006.01915.x
更新日期:2006-06-01 00:00:00
abstract::The use of energy dispersive analysis of X-rays (EDAX) to identify and quantify the presence of chlorhexidine diacetate (CHA) within Saccharomyces cerevisiae cells was examined. Chlorine was used as the elemental marker tag. Saccharomyces cerevisiae cells exposed to 1000 micrograms ml-1 CHA took up increasing amounts ...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765x.1995.tb01319.x
更新日期:1995-06-01 00:00:00
abstract:AIMS:Tuberculous pleurisy is an important cause of pleural effusions in areas with a high incidence of tuberculosis. In this study, we developed an IS1081-based LAMP for the detection of Mycobacterium tuberculosis complex and investigated its usefulness in the diagnosis of tuberculous pleurisy. METHODS AND RESULTS:Inv...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.2011.03141.x
更新日期:2011-11-01 00:00:00
abstract::The objective of this study was to undertake a microbiological survey of foods, animal faeces and wastewater samples for Clostridium difficile, and determine the genotypes and antimicrobial susceptibilities of isolates. A total of 211 samples were tested for C. difficile using culture methods. Thirteen toxigenic C. di...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.13238
更新日期:2020-01-01 00:00:00
abstract::To enhance the overall expression level of lipase isozymes which catalyse the same reaction in Pichia pastoris through co-expression of isozymes from different sources; several types of co-expression ways were constructed to determine the co-expression efficiencies of lipase isozymes in P. pastoris. The results showed...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.12783
更新日期:2017-10-01 00:00:00
abstract::Control of biofouling on seawater reverse osmosis (SWRO) membranes is a major challenge as treatments can be expensive, damage the membrane material and often biocides do not remove the polymers in which bacteria are embedded. Biological control has been largely ignored for biofouling control. The objective of this st...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.12747
更新日期:2017-07-01 00:00:00
abstract::Suitable conditions for the introduction of bacteriophage DNA into cells of Rhodococcus rhodochrous CF222 by electroporation were established, and penicillin G was found to enhance the transfection frequency. When conditions optimal for the parental strain were applied to its colony-morphological mutants, different tr...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765x.1996.tb01110.x
更新日期:1996-01-01 00:00:00
abstract::The yield of purified recombinant alpha-sarcin increases approximately three- to fourfold when this toxin is co-expressed in Escherichia coli with thioredoxin. This increased production is attributed to the existence, in the presence of thioredoxin, of a reducing environment which allows rearrangement of incorrect dis...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1046/j.1472-765x.2000.00714.x
更新日期:2000-04-01 00:00:00
abstract:AIMS:To examine factors affecting faecal shedding of the foodborne pathogens Escherichia coli O157:H7 and Salmonella in dairy cattle and evaluate antimicrobial susceptibility of these isolates. METHODS:Faecal samples were obtained in replicate from lactating (LAC; n = 60) and non-lactating (NLAC; n = 60) Holstein catt...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1046/j.1472-765x.2003.01417.x
更新日期:2003-01-01 00:00:00
abstract:UNLABELLED:Most of the current research into the quantification of soil-borne pathogenic oomycetes lacks determination of DNA extraction efficiency, probably leading to an incorrect estimation of DNA quantity. In this study, we developed a convenient method by using a 100 bp artificially synthesized DNA sequence derive...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.12441
更新日期:2015-08-01 00:00:00
abstract::An investigation of the biochemical, nutritional and pathogenic reactions of strains of Pseudomonas syringae pv. japonica and Ps. syringae pv. syringae showed them to be indistinguishable. Pseudomonas syringae pv. japonica is a junior synonym of Ps. syringae pv. syringae. ...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.1992.tb00744.x
更新日期:1992-10-01 00:00:00
abstract:UNLABELLED:The probiotic Arthrobacter sp. CW9 isolated from guts of white shrimp (Penaeus vannamei) was used to improve the survival rate, growth rate and immune status of white shrimp (P. vannamei). Arthrobacter sp. CW9 was added to the saline rearing water at 0, 10(5), 10(6) and 10(7) CFU ml(-1) once every 5 days dur...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.12156
更新日期:2014-01-01 00:00:00
abstract:AIMS: Lesions of DNA are removed by nucleotide excision repair (NER) process in the living systems. NER process-related host factors are believed to aid recovery steps during viral integration. Here, we report identification and characterization of a DNA repair molecule Rad23 from kuruma shrimp Marsupenaeus japonicus. ...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.2011.03073.x
更新日期:2011-07-01 00:00:00
abstract::A method was developed to obtain reproducible DNA fingerprints from Campylobacter by PCR-based amplification, without the need to isolate total DNA. Randomly amplified polymorphic DNA (RAPD) profiles were generated with three randomly designed 10-mers, using each separately as an amplification primer. A range of C. je...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765x.1992.tb00700.x
更新日期:1992-06-01 00:00:00
abstract:AIMS:To establish species-specific PCR and DNA probe methods for Streptococcus salivarius and to clarify the distribution of dextranase in oral isolates of Strep. salivarius. METHODS AND RESULTS:A pair of PCR primers and a DNA probe were designed based on the nucleotide sequence of the dextranase gene of Strep. saliva...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1046/j.1472-765x.2001.00928.x
更新日期:2001-06-01 00:00:00
abstract:AIMS: The primary goal of this study was to characterize the existence of a functional c-di-GMP pathway in the bioleaching bacterium Acidithiobacillus ferrooxidans. METHODS AND RESULTS: A bioinformatic search revealed that the genome sequence of At. ferrooxidans ATCC 23270 codes for several proteins involved in the ...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.2011.03180.x
更新日期:2012-02-01 00:00:00
abstract:UNLABELLED:Bioconversion of biomass, particularly crop wastes, into biofuels is being developed as an alternative approach in meeting the high energy demand. In this study, a thermophilic bacterial strain BY-3 that exhibits cellulolytic potential was isolated from faecal samples of Tibetan pigs; this strain was identif...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.12276
更新日期:2014-09-01 00:00:00
abstract:AIMS:We report the analysis of genetic determinants conferring resistance to pristinamycin in Staphylococcus epidermidis strains and epidemiology typing of these strains by pulsed-field gel electrophoresis. METHODS AND RESULTS:Staphylococcus epidermidis (346 isolates) were searched for strains with pristinamycin resis...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.2007.02318.x
更新日期:2008-03-01 00:00:00
abstract::The marine antimicrobial peptide NZ17074, a variant of arenicin-3 from Arenicola marina that has broad antimicrobial activity and high bioavailability, can be designed to treat bacterial and fungal diseases. To reduce the toxicity of NZ17074, N6 was designed by replacing a cysteine in positions 3 and 20 with alanine, ...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.12770
更新日期:2017-09-01 00:00:00
abstract::A total of 87 isolates of Yersinia enterocolitica were examined with randomly amplified polymorphic DNA (RAPD) by use of three different primers. Based on the RAPD profiles, the strains could be divided into three major groups: (1) the pathogenic American serotypes, O:8, O:13ab, O:20 and O:21; (2) the pathogenic Europ...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765x.1994.tb00475.x
更新日期:1994-11-01 00:00:00
abstract:UNLABELLED:In this study, we developed and validated a loop-mediated isothermal amplification (LAMP) assay for Salmonella detection targeting bcfD gene, a conserved fimbrial operon gene existing in Salmonella. The Salmonella LAMP assay we developed successfully amplified 44 Salmonella strains (14 standard strains and 3...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.12328
更新日期:2014-12-01 00:00:00
abstract:AIM:To stimulate poly-beta-hydroxybutyrate (PHB) accumulation in Synechocystis sp. PCC 6803 by manipulating culture conditions. METHODS AND RESULTS:Stationary phase cultures of Synechocystis sp. PCC 6803 were subjected to N- and P-deficiency, chemoheterotrophy and limitations of gas-exchange. Enhanced PHB accumulation...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765X.2006.02048.x
更新日期:2007-02-01 00:00:00
abstract::RAPD technique (randomly amplified polymorphic DNA) was used for epidemiological subtyping of Bacillus licheniformis and other Bacillus spp. Within 46 isolates of B. licheniformis, up to 10 strain types could be determined when two 10-mer primers were used. RAPD patterns, which were found in eight further strains of B...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/j.1472-765x.1994.tb00864.x
更新日期:1994-05-01 00:00:00
abstract::A Multiplex PCR-based assay (m-PCR) with three sets of primers was developed for the detection of all serotypes of Salmonella enterica and the identification of Salmonella Enteritidis and Salmonella Typhimurium. This method was evaluated against a bacteriological method for the analysis of environmental swabs of poult...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1046/j.1365-2672.1999.00488.x
更新日期:1999-02-01 00:00:00
abstract::The fate of Salmonella enteritidis PT4 in home-made mayonnaise prepared with citric acid solution (citric acid concentration of > or = 4.98% (w/v)) was investigated. It was found that pH of mayonnaise is closely related to the ratio of egg yolk to citric acid, and the inactivation rate of the micro-organisms increases...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1046/j.1365-2672.1999.00473.x
更新日期:1999-01-01 00:00:00
abstract::Shigella spp. are water-borne pathogens responsible for mild to severe cases bacilli dysentery all around the world known as Shigellosis. The progressively increasing of antibiotic resistance among Shigella calls for developing and establishing novel alternative therapeutic methods. The present study aimed to evaluate...
journal_title:Letters in applied microbiology
pub_type: 杂志文章
doi:10.1111/lam.13418
更新日期:2020-10-18 00:00:00