Abstract:
:The SecYEG heterotrimeric membrane protein complex functions as a channel for protein translocation across the Escherichia coli cytoplasmic membrane. SecY is the central subunit of the SecYEG complex and contains 10 transmembrane segments (TM1 to TM10). Previous mutation studies suggested that TM3 and TM4 are particularly important for SecY function. To further characterize TM3 and TM4, we introduced a series of cysteine-scanning mutations into these segments. With one exception (an unstable product), all the mutant proteins complemented the cold-sensitive growth defect of the secY39 mutant. A combination of this secY mutation and the secG deletion resulted in synthetic lethality, and the TM3 and TM4 SecY cysteine substitution mutations were examined for their ability to complement this lethality. Although they were all positive for complementation, some of the complemented cells exhibited significant retardation of protein export. The substitution-sensitive residues in TM3 can be aligned to one side of the alpha-helix, and those in TM4 revealed a tendency for residues closer to the cytosolic side of the membrane to be more severely affected. Disulfide cross-linking experiments identified a specific contact point for TM3 and SecG TM2 as well as for TM4 and SecG TM1. Thus, although TM3 and TM4 do not contain any single residue that is absolutely required, they include functionally important helix surfaces and specific contact points with SecG. These results are discussed in light of the structural information available for the SecY complex.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Mori H,Shimokawa N,Satoh Y,Ito Kdoi
10.1128/JB.186.12.3960-3969.2004keywords:
subject
Has Abstractpub_date
2004-06-01 00:00:00pages
3960-9issue
12eissn
0021-9193issn
1098-5530pii
186/12/3960journal_volume
186pub_type
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更新日期:1999-06-01 00:00:00
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更新日期:1975-08-01 00:00:00
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更新日期:2006-04-01 00:00:00
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更新日期:1967-04-01 00:00:00
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更新日期:1968-02-01 00:00:00
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更新日期:1990-04-01 00:00:00
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更新日期:1976-05-01 00:00:00
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更新日期:1994-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:1987-09-01 00:00:00
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更新日期:2007-01-01 00:00:00
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更新日期:2004-02-01 00:00:00
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更新日期:2004-06-01 00:00:00
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更新日期:1966-03-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JB.155.3.1429-1433.1983
更新日期:1983-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:1971-09-01 00:00:00
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更新日期:1969-03-01 00:00:00
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pub_type: 杂志文章
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更新日期:1972-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:1971-12-01 00:00:00
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pub_type: 杂志文章
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更新日期:1986-09-01 00:00:00
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更新日期:1979-11-01 00:00:00
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journal_title:Journal of bacteriology
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更新日期:1964-07-01 00:00:00
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journal_title:Journal of bacteriology
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更新日期:2004-09-01 00:00:00
abstract::Spores of all strains of Dictyostelium discoideum tested in this study germinated after a heat shock of 45 C for 30 min. Whereas the strains differed in their rates of germination, the rate for each strain was constant. A correlation existed between the rate of germination and the rate of vegetative growth when spores...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.96.5.1690-1695.1968
更新日期:1968-11-01 00:00:00