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Advanced bacterial genetics
Gut inflammation provides a respiratory electron acceptor for Salmonella
TLDR
It is shown that reactive oxygen species generated during inflammation react with endogenous, luminal sulphur compounds (thiosulphate) to form a new respiratory electron acceptor, tetrathionate, that allows the pathogen to use respiration to compete with fermenting gut microbes.
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Cobalamin (coenzyme B12): synthesis and biological significance.
TLDR
This review examines deoxyadenosylcobalamin (Ado-B12) biosynthesis, transport, use, and uneven distribution among living forms and suggests that the B12 synthetic pathway may have evolved to allow anaerobic fermentation of small molecules in the absence of an external electron acceptor.
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The 17-Gene Ethanolamine (eut) Operon ofSalmonella typhimurium Encodes Five Homologues of Carboxysome Shell Proteins
TLDR
Five of the dispensable eut genes, five encode apparent homologues of proteins that serve (in other organisms) as shell proteins of the carboxysome, which suggests that CO2 fixation may be a feature of ethanolamine catabolism in Salmonella.
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Advanced Bacterial Genetics: A Manual for Genetic Engineering
Procedure for Identifying Nonsense Mutations
TLDR
A method has been devised for the rapid identification of nonsense mutations (UAG, UAA, UGA codons) in Salmonella by replica-printed onto lactose plates spread with lawns of tester strains containing nonsense mutations in the episomal Z gene.
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Selfish operons: horizontal transfer may drive the evolution of gene clusters.
TLDR
A model is presented whereby the formation of gene clusters in bacteria is mediated by transfer of DNA within and among taxa, and predicts a mosaic structure of modern genomes in which ancestral chromosomal material is interspersed with novel, horizontally transferred operons providing peripheral metabolic functions.
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Intestinal inflammation allows Salmonella to use ethanolamine to compete with the microbiota
TLDR
It is shown that use of a specific nutrient (ethanolamine) confers a marked growth advantage on Salmonella enterica serovar Typhimurium in the lumen of the inflamed intestine.
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Tandem genetic duplications in phage and bacteria.
SELECTION OF TANDEM DUPLICATIONS 478 Gene Dosage 478 Coinheritance of Allelic Markers 485 Operon Fusion ..... ....... ...... .... ... ......... 496
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Characterization of the cobalamin (vitamin B12) biosynthetic genes of Salmonella typhimurium
TLDR
Differences in the DNA sequence for the promoter region and the proximal 17.1 kb of the cob operon suggest that the cobalamin biosynthetic pathways differ between the two organisms.
View on ASMUSA
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