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J. Bacteriol., Mar 1996, 1770-1773, Vol 178, No. 6
SW Lazar and R Kolter
Many proteins require enzymatic assistance in order to achieve a functional
conformation. One rate-limiting step in protein folding is the cis-trans
isomerization of prolyl residues, a reaction catalyzed by prolyl
isomerases. SurA, a periplasmic protein of Escherichia coli, has sequence
similarity with the prolyl isomerase parvulin. We tested whether SurA was
involved in folding periplasmic and outer membrane proteins by using
trypsin sensitivity as an assay for protein conformation. We determined
that the efficient folding of three outer membrane proteins (OmpA, OmpF,
and LamB) requires SurA in vivo, while the folding of four periplasmic
proteins was independent of SurA. We conclude that SurA assists in the
folding of certain secreted proteins.
Copyright © 1996, American Society for Microbiology
SurA assists the folding of Escherichia coli outer membrane proteins
Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston MA 02115, USA.
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