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Effects of lipids on the interaction of SecA with model membranes.

Abstract：

:The effects of nonlamellar-prone lipids, diacylglycerol and phosphatidylethanolamine (PE), on the kinetic association of SecA with model membranes were examined by measuring changes in the intrinsic emission fluorescence with a stopped-flow apparatus. Upon interaction with standard liposomes composed of 50 mol% dioleolyphosphatidylcholine (DOPC) and 50 mol% of dioleoylphosphatidylglycerol (DOPG), the intrinsic fluorescence intensity of SecA was decreased after a lapse of time with a rate constant of 0.0049 s(-1). When the DOPC of the standard vesicles was gradually replaced with either dioeloyl PE (DOPE) or Escherichia coli (E. coli) PE, the rate constant increased appreciably as a function of PE concentration, in the order DOPE > E. coli PE. In addition, when the PE of E. coli PE/DOPG (50/50) vesicles was replaced with more than 5 mol% dioleoylglycerol (DOG), the rate constant further increased by 40%. The incorporation of nonlamellar-prone lipids in the vesicles also enhanced the binding of SecA to model membranes in the order DOPE > or = E. coli PE/DOG > E. coli PE > DOPC. These results provide the first kinetic evidence for the importance of nonlamellar-prone phospholipids for the association rate of SecA with membranes.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Ahn T,Kim JS,Lee BC,Yun CH

doi

10.1006/abbi.2001.2565

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

14-20

issue

1

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(01)92565-2

journal_volume

395

pub_type

杂志文章

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