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Science 15 July 1988:
Vol. 241. no. 4863, pp. 336 - 339
DOI: 10.1126/science.3388043
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Articles

Science, Vol 241, Issue 4863, 336-339
Copyright © 1988 by American Association for the Advancement of Science

articles

Molecular cloning of odorant-binding protein: member of a ligand carrier family

J Pevsner, RR Reed, PG Feinstein, and SH Snyder

Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205.

Odorant-binding protein (OBP) is found in nasal epithelium, and it selectively binds odorants. Three complementary DNAs encoding rat odorant-binding protein have now been cloned and sequenced. One clone contains an open reading frame predicted to encode an 18,091-dalton protein. RNA blot analysis confirms the localization of OBP messenger RNA in the nasal epithelium. This OBP has 33 percent amino acid identity to alpha 2-microglobulin, a secreted plasma protein. Other members of an alpha 2-microglobulin superfamily bind and transport hydrophobic ligands. Thus, OBP probably binds and carries odorants within the nasal epithelium to putative olfactory receptors.


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