Regulation of Escherichia coli secA by Cellular Protein Secretion Proficiency Requires an Intact Gene X Signal Sequence and an Active Translocon
1998 ◽
Vol 180
(19)
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pp. 5240-5242
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ABSTRACT secA is translationally regulated by the protein secretion proficiency state of the Escherichia coli cell. This regulation was explored by making signal sequence mutations in the gene upstream of secA, gene X, which promotessecA translational coupling. Gene X signal sequence mutants were constitutive for secA expression, whileprlA alleles partially restored secAregulation. These results show that interaction of the pre-gene X protein with the translocon is required for proper secAregulation. Furthermore, gene X signal sequence mutations disruptedsecA regulation only in the cis configuration. We propose that nascent pre-gene X protein interacts with the translocon during its secretion to constitute the secretion sensor.
1986 ◽
Vol 261
(7)
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pp. 3389-3395
1990 ◽
Vol 265
(28)
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pp. 17118-17125
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1990 ◽
Vol 265
(13)
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pp. 7338-7344
1993 ◽
Vol 268
(23)
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pp. 17069-17073
1994 ◽
Vol 67
(4)
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pp. 1546-1561
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