The Cs sec mutants of Escherichia coli reflect the cold sensitivity of protein export itself.

Abstract:

:We have found that temperature can have a striking effect upon protein export in Escherichia coli, suggesting that there is a cold-sensitive step in the protein export pathway. Cs mutations comprise the largest class of mutations affecting the membrane-localized Sec proteins SecD, SecE, SecF and SecY. Although some of these mutations could encode cold-labile proteins, this is unlikely to account for the Cs phenotype of most export mutants, as mutations which simply produce lower amounts of SecE protein have the same phenotype. Certain signal sequence mutations affecting maltose binding protein are also cold sensitive for export. These effects appear to arise by a specific interaction of cold with certain export defects. We believe that the Cs sec mutations are representative of a large class of conditional lethal mutations, whose conditional phenotype reflects an underlying thermal sensitivity of the process in which they are involved.

journal_name

Genetics

journal_title

Genetics

authors

Pogliano KJ,Beckwith J

subject

Has Abstract

pub_date

1993-04-01 00:00:00

pages

763-73

issue

4

eissn

0016-6731

issn

1943-2631

journal_volume

133

pub_type

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