We report the molecular cloning of the cDNA sequence for pig peripheral benzodiazepine receptor (PBR) by using RT-PCR and 5′/3′ terminal extension. Three different transcripts (long, middle, and short) are identified. The open reading frame (ORF) of the longest PBR mRNA encodes a deduced polypeptide of 169 amino acids with a calculated molecular weight of 18,609 Da and an estimated pI of 9.70, which corresponds to the authentic PBR of other mammalian species. The middle transcript (PBR-M) contains a 141-codon ORF, which is consistent with that of the authentic PBR, but lacks a region of 84 bp so that its encoded polypeptide lacks a region of 28 amino acids from 35 to 62 of the authentic PBR polypeptide. The short transcript (PBR-S) contains a 104-codon ORF, which overlaps that of the authentic PBR, but lacks a region of 211 bp so that its encoded polypeptide lacks a region of 65 amino acids of the N-terminal of the authentic PBR. The pig PBR gene was mapped to the telomeric end of SSC5p. In addition, PBR mRNA was the more abundant detected form in pig tissues and in warm kidney that underwent ischemia suggesting functional implications of PBR during the renal repair process.
Mammalian Genome – Springer Journals
Published: Oct 3, 2006
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