Membrane interactions and self‐association of the TatA and TatB components of the twin‐arginine translocation pathway

FEBS Letters

Porcelli, Ida¹  Sargent, Frank¹  De Leeuw, Erik¹  Berks, Ben C.¹  Palmer, Tracy¹ 

[1] Centre for Metalloprotein Spectroscopy and Biology, School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK

关键词: Tat protein translocase;    Chemical crosslinking;    Protein transport;    Escherichia coli;    CHAPS;    3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate;    DSS;    disuccinimidyl suberate;    IMVs;    inner membrane vesicles;   

DOI  :  10.1016/S0014-5793(01)02904-0

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The Escherichia coli Tat system mediates Sec-independent export of protein precursors bearing twin-arginine signal peptides. The essential Tat pathway components TatA, TatB and TatC are shown to be integral membrane proteins. Upon removal of the predicted N-terminal transmembrane helix TatA becomes a water-soluble protein. In contrast the homologous TatB protein retains weak peripheral interactions with the cytoplasmic membrane when the analogous helix is deleted. Chemical crosslinking studies indicate that TatA forms at least homotrimers, and TatB minimally homodimers, in the native membrane environment. The presence of such homo-oligomeric interactions is supported by size exclusion chromatography.

【 授权许可】

Unknown