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1a3y

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ODORANT BINDING PROTEIN FROM NASAL MUCOSA OF PIG

Structural highlights

1a3y is a 2 chain structure with sequence from Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.25Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

OBP_PIG This protein is found in nasal epithelium and it binds a wide variety of chemical odorants.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The X-ray structure of the porcine odorant binding protein (OBPp) was determined at 2.25 A resolution. This lipocalin is a monomer and is devoid of naturally occurring bound ligand, contrary to what was observed in the case of bovine OBP [Tegoni, M., et al. (1996) Nat. Struct. Biol. 3, 863-867; Bianchet, M. A., et al. (1996) Nat. Struct. Biol. 3, 934-939]. In this latter protein, a dimer without any disulfide bridges, domain swapping was found to occur between the beta- and alpha-domains. A single Gly (121) insertion was found in OBPp when it was compared to OBPb, which may prevent domain swapping from taking place. The presence of a disulfide bridge between the OBPp beta- and alpha-domains (cysteines 63 and 155) may lock the resulting fold in a nonswapped monomeric conformation. Comparisons with other OBPs indicate that the two cysteines involved in the OBPp disulfide bridge are conserved in the sequence, suggesting that OBPp may be considered a prototypic OBP fold, and not OBPb.

The structure of the monomeric porcine odorant binding protein sheds light on the domain swapping mechanism.,Spinelli S, Ramoni R, Grolli S, Bonicel J, Cambillau C, Tegoni M Biochemistry. 1998 Jun 2;37(22):7913-8. PMID:9609684^[1]

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

References

↑ Spinelli S, Ramoni R, Grolli S, Bonicel J, Cambillau C, Tegoni M. The structure of the monomeric porcine odorant binding protein sheds light on the domain swapping mechanism. Biochemistry. 1998 Jun 2;37(22):7913-8. PMID:9609684 doi:10.1021/bi980179e