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1m5y, resolution 3.00Å ()
Gene: sura (Escherichia coli)
Activity: Peptidylprolyl isomerase, with EC number
Resources: FirstGlance, OCA, RCSB, PDBsum
Coordinates: save as pdb, mmCIF, xml

Crystallographic Structure of SurA, a Molecular Chaperone that Facilitates Outer Membrane Porin Folding

Publication Abstract from PubMed

The SurA protein facilitates correct folding of outer membrane proteins in gram-negative bacteria. The sequence of Escherichia coli SurA presents four segments, two of which are peptidyl-prolyl isomerases (PPIases); the crystal structure reveals an asymmetric dumbbell, in which the amino-terminal, carboxy-terminal, and first PPIase segments of the sequence form a core structural module, and the second PPIase segment is a satellite domain tethered approximately 30 A from this module. The core module, which is implicated in membrane protein folding, has a novel fold that includes an extended crevice. Crystal contacts show that peptides bind within the crevice, suggesting a model for chaperone activity whereby segments of polypeptide may be repetitively sequestered and released during the membrane protein-folding process.

Crystallographic structure of SurA, a molecular chaperone that facilitates folding of outer membrane porins., Bitto E, McKay DB, Structure. 2002 Nov;10(11):1489-98. PMID:12429090

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

About this Structure

1m5y is a 4 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA.


  • Bitto E, McKay DB. Crystallographic structure of SurA, a molecular chaperone that facilitates folding of outer membrane porins. Structure. 2002 Nov;10(11):1489-98. PMID:12429090

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