The molecular biology of barophilic bacteria |
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Authors: | Chiaki Kato Douglas H Bartlett |
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Institution: | The Deepstar Group, Japan Marine Science and Technology Center (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237, Japan Tel. +81-468-67-5555; Fax +81-468-66-6364 ?e-mail: katoc@jamstec.go.jp, JP Marine Biology Research Division, 0202, Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0202, USA, US
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Abstract: | Many microorganisms from the deep-sea display high-pressure-adapted — also described as barophilic or piezophilic — growth
characteristics. Phylogenetic studies have revealed that a large proportion of the barophilic bacteria currently in culture
collections belong to a distinct subgroup of the genus Shewanella, referred to as the “barophile branch.“ Many of the basic properties of barophiles that enable their survival at extremes
of pressure remain to be elucidated. However, several genes whose expression is regulated by pressure, or which appear to
be critical to baroadaptation, have been uncovered. One such operon, whose presence appears to be restricted to the “barophile
branch,” has been identifed in DNA samples obtained from sediments recovered in the deepest ocean trench. In the case of another
set of pressure-regulated genes, regulatory elements required for pressure signaling have been uncovered. The nature and regulation
of these genes is discussed.
Received: February 19, 1997 / Accepted: March 3, 1997 |
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Keywords: | Barophile branch Barophilic bacteria Deep-sea High pressure Photobacterium sp Pressure-regulated gene Pressure sensing Shewanalla sp toxR/S |
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