Jr. Wolf et al., THE PUTATIVE MEMBRANE ANCHOR PROTEIN FOR YEAST SEC7P RECRUITMENT, Biochemical and biophysical research communications, 224(1), 1996, pp. 126-133
Proteins required For yeast secretory pathway function have been ident
ified by genetic selection and characterization of the temperature-sen
sitive secretory (sec) mutants. The use of genetic and biochemical app
roaches has expanded the catalog of components of the secretory pathwa
y, yet many proteins, especially membrane and lumenal proteins, remain
to be identified. Sec7p, one of the original SEC gene products to be
described, is required at multiple stages of the yeast secretory pathw
ay in the coating of transport vesicles. A chemical cross-linking appr
oach was used to identify proteins associated with Sec7p protein compl
exes from yeast cell lysates. A 90 kDa integral membrane protein (p90)
was isolated whose interactions with Sec7p were reproduced in the abs
ence of chemical cross-linking. Further biochemical analysis indicated
that p90 may act as the anchor protein for Sec7p membrane recruitment
in transport vesicle assembly. (C) 1996 Academic Press, Inc.