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Originally published In Press as doi:10.1074/jbc.M101034200 on April 20, 2001
J. Biol. Chem., Vol. 276, Issue 26, 23607-23615, June 29, 2001
SopE Acts as an Rab5-specific Nucleotide Exchange Factor and
Recruits Non-prenylated Rab5 on Salmonella-containing
Phagosomes to Promote Fusion with Early Endosomes*
Konark
Mukherjee ,
Seetharaman
Parashuraman ,
Manoj
Raje§, and
Amitabha
Mukhopadhyay ¶
From the National Institute of Immunology, Aruna Asaf
Ali Marg, New Delhi 110067 and the § Institute of Microbial
Technology, Sector 39A, Chandigarh 160036, India
Rab-GTPase regulates the fusion between two
specific vesicles. It is well documented that, for their biological
function, Rab proteins need to be prenylated for attachment to the
vesicle membrane. In contrast, we showed in the present investigation that SopE, a type III secretory protein of Salmonella,
translocates onto Salmonella-containing phagosomes (LSP)
and mediates the recruitment of non-prenylated Rab5 (Rab5: C4) on LSP
in GTP form. Simultaneously, SopE present in infected cell cytosol acts
as an Rab5-specific exchange factor and converts the inactive Rab-GDP
to the GTP form. The non-prenylated Rab5 subsequently promoted
efficient fusion of LSP with early endosomes. This is the first
demonstration that a prenylation-deficient Rab protein retains
biological activity and can promote vesicle fusion, if it is recruited
on the membrane by some other method.
*
These studies are supported by grants from the Department of
Biotechnology and Indian Council of Medical Research.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
¶
To whom correspondence should be addressed: Cell Biology
Laboratory, National Institute of Immunology, New Delhi 110067, India. Tel.: 91-11-6162281 or 91-11-6183004; Fax: 91-11-6109433 or
91-11-6162125; E-mail: amitabha@nii.res.in.
Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2001 by the American Society for Biochemistry and Molecular Biology.
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