PMID:14506253

Citation	Bitto, E and McKay, DB (2003) The periplasmic molecular chaperone protein SurA binds a peptide motif that is characteristic of integral outer membrane proteins. J. Biol. Chem. 278:49316-22
Abstract	The Escherichia coli SurA protein is a periplasmic molecular chaperone that facilitates correct folding of outer membrane porins. The peptide binding specificity of SurA has been characterized using phage display of heptameric peptides of random sequence. The consensus binding pattern of aromatic-polar-aromatic-nonpolar-proline amino acids emerges for both SurA and a SurA "core domain," which remains after deletion of a peripheral peptidyl-proline isomerase domain. Isothermal titration calorimetry with a high affinity heptameric peptide of sequence WEYIPNV yields peptide affinities in the range of 1-14 microm for both SurA and its core domain. Although the peptide consensus aromatic-polar-aromatic-nonpolar-proline occurs infrequently in E. coli proteins, the less restrictive tripeptide motif aromatic-random-aromatic appears with greater-than-random frequency in outer membrane proteins and is prevalent in the "aromatic bands" of the porin beta barrel structures. Thus, SurA recognizes a peptide motif that is characteristic of integral outer membrane proteins.
Links	PubMed Online version:10.1074/jbc.M308853200
Keywords	Amino Acid Sequence; Bacterial Outer Membrane Proteins/chemistry; Bacterial Outer Membrane Proteins/metabolism; Base Sequence; Carrier Proteins; DNA Primers; Enzyme-Linked Immunosorbent Assay; Escherichia coli/metabolism; Escherichia coli Proteins; Models, Molecular; Molecular Chaperones/chemistry; Molecular Chaperones/metabolism; Peptidylprolyl Isomerase/chemistry; Peptidylprolyl Isomerase/metabolism; Periplasm/metabolism; Protein Binding
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
ECOLI:SURA	enables	GO:0042277: peptide binding	ECO:0000314: direct assay evidence used in manual assertion		F		Seeded From UniProt	complete

References

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