The Journal of antimicrobial chemotherapy · 2004
Evolutionary mapping of the SHV beta-lactamase and evidence for two separate IS26-dependent blaSHV mobilization events from the Klebsiella pneumoniae chromosome.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод пока не подготовлен
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Ford Peter J, Avison Matthew B
Аннотация
OBJECTIVES: To determine the most likely evolutionary pathway that has led to the development of extended-spectrum SHV derivatives, and to the mobilization of blaSHV.
MATERIALS AND METHODS: Evolutionary mapping used a shortest-path analysis of aligned blaSHV variants, and other basic bioinformatic approaches, such as CLUSTAL W and Blast were employed.
RESULTS: Two main branches of the blaSHV evolutionary tree were located; both are derived from variant blaSHV-1 alleles. Identical mutations, responsible for extended-spectrum SHV substrate profiles, have been selected independently in each branch. There is evidence for a pool of non-mobile blaSHV framework sequences. Analysis of the genome sequence of Klebsiella pneumoniae confirms the chromosomal origin of blaSHV, whose mobilization has occurred at least twice, once for each of the main evolutionary branches. Both these mobilization events have been catalysed by IS26. Evolution of blaSHV to give common extended-spectrum variants is most likely to have occurred following mobilization.
CONCLUSIONS: These data shed new light on the evolution and mobilization of blaSHV, and these observations may be useful in predicting what might happen in future, both for blaSHV, and for other beta-lactamase genes.
MATERIALS AND METHODS: Evolutionary mapping used a shortest-path analysis of aligned blaSHV variants, and other basic bioinformatic approaches, such as CLUSTAL W and Blast were employed.
RESULTS: Two main branches of the blaSHV evolutionary tree were located; both are derived from variant blaSHV-1 alleles. Identical mutations, responsible for extended-spectrum SHV substrate profiles, have been selected independently in each branch. There is evidence for a pool of non-mobile blaSHV framework sequences. Analysis of the genome sequence of Klebsiella pneumoniae confirms the chromosomal origin of blaSHV, whose mobilization has occurred at least twice, once for each of the main evolutionary branches. Both these mobilization events have been catalysed by IS26. Evolution of blaSHV to give common extended-spectrum variants is most likely to have occurred following mobilization.
CONCLUSIONS: These data shed new light on the evolution and mobilization of blaSHV, and these observations may be useful in predicting what might happen in future, both for blaSHV, and for other beta-lactamase genes.