Purification and characterization of pheromaxein, the porcine steroid-binding protein. A member of the secretoglobin superfamily

Austin, Corrine J. and Emberson, Louise M. and Nicholls, Peter J. (2004) Purification and characterization of pheromaxein, the porcine steroid-binding protein. A member of the secretoglobin superfamily. European Journal of Biochemistry, 271 (13). pp. 2593-2606. ISSN 0014-2956. (Access to this publication is restricted)

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Abstract

Low molecular mass proteins are implicated in chemical communication throughout mammalian species, being involved in both perception and delivery of pheromonal compounds. In boars, pheromones are secreted in saliva to cause oestrous sows to take up the mating stance. These pheromones are the 16-androstene steroids, 5alpha-androsten-3alpha-ol and 5alpha-androsten-3-one. The submaxillary glands of boars contain a low molecular mass protein, pheromaxein, which is capable of binding these 16-androstene pheromones. Pheromaxein was purified, cloned and characterized. It was found to be a nonglycosylated heterodimeric protein, belonging to the secretoglobin superfamily and the major 16-androstene-binding protein present in submaxillary salivary glands of the boar. One subunit, pheromaxein A, was found to be homologous to prostatein peptides, C1 and C2 and lipophilin A and B, whereas the other subunit, pheromaxein C, was homologous to prostatein peptide C3 and lipophilin C. Transcription of pheromaxein A was limited to the prostate and submaxillary salivary glands from both the boar and sow, whereas transcription of the other subunit, pheromaxein C, was more widespread. This is similar to the transcription distribution of lipophilin in humans. Many isoforms of pheromaxein were found to exist, with a molecular mass range of 17,415-18,159 Da; these are probably products of a multigene family. Post-translational modifications, to generate mature pheromaxein isoforms, probably include C-terminal cleavage of pheromaxein A, followed by additional modifications.

Item Type: Article
Uncontrolled keywords: androstenone; lipocalin; pheromaxein; secretoglobin; steroid-binding protein
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences > Biomedical Research Group
Depositing User: Sue Davies
Date Deposited: 19 Dec 2007 17:51
Last Modified: 03 Jun 2014 08:42
Resource URI: http://kar.kent.ac.uk/id/eprint/57 (The current URI for this page, for reference purposes)
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