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Vol. 10, Issue 2, 435-453, February 1999
Membrane Biology Laboratory, Institute of Molecular and Cell
Biology, Singapore 117609, Singapore
Yeast Sec22p participates in both anterograde and retrograde
vesicular transport between the endoplasmic reticulum (ER) and the
Golgi apparatus by functioning as a v-SNARE (soluble
N-ethylmaleimide-sensitive factor [NSF] attachment
protein receptor) of transport vesicles. Three mammalian proteins
homologous to Sec22p have been identified and are referred to as
Sec22a, Sec22b/ERS-24, and Sec22c, respectively. The existence of three
homologous proteins in mammalian cells calls for detailed cell
biological and functional examinations of each individual protein. The
epitope-tagged forms of all three proteins have been shown to be
primarily associated with the ER, although functional examination has
not been carefully performed for any one of them. In this study, using
antibodies specific for Sec22b/ERS-24, it is revealed that endogenous
Sec22b/ERS-24 is associated with vesicular structures in both the
perinuclear Golgi and peripheral regions. Colabeling experiments for
Sec22b/ERS-24 with Golgi mannosidase II, the KDEL receptor, and
the envelope glycoprotein G (VSVG) of vesicular stomatitis virus (VSV)
en route from the ER to the Golgi under normal, brefeldin A, or
nocodazole-treated cells suggest that Sec22b/ERS-24 is enriched in the
pre-Golgi intermediate compartment (IC). In a well-established
semi-intact cell system that reconstitutes transport from the ER to the
Golgi, transport of VSVG is inhibited by antibodies against
Sec22b/ERS-24. EGTA is known to inhibit ER-Golgi transport at a stage
after vesicle/transport intermediate docking but before the actual
fusion event. Antibodies against Sec22b/ERS-24 inhibit ER-Golgi
transport only when they are added before the EGTA-sensitive stage.
Transport of VSVG accumulated in pre-Golgi IC by incubation at 15°C
is also inhibited by Sec22b/ERS-24 antibodies. Morphologically, VSVG is
transported from the ER to the Golgi apparatus via vesicular
intermediates that scatter in the peripheral as well as the Golgi
regions. In the presence of antibodies against Sec22b/ERS-24, VSVG is
seen to accumulate in these intermediates, suggesting that
Sec22b/ERS-24 functions at the level of the IC in ER-Golgi transport.
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