Molecular cloning and sequencing of the cDNA coding for a novel regucalcin gene promoter region-related protein in rat, mouse and human liver

International Journal of Molecular Medicine
H Misawa, M Yamaguchi

Abstract

The molecular cloning and sequencing of the cDNA coding for a novel regucalcin gene promoter region-related protein (RGPR) was investigated using rat, mouse and human liver cDNA library with a yeast one-hybrid system and a rapid amplification of cDNA ends (RACE) method. The clone coding an unknown protein was isolated, and a novel protein was identified. This protein was termed as RGPR-p117. RGPR-p117 in rat, mouse and human liver consisted of 1058, 1051 and 1060 amino acid residues with calculated molecular mass of 117, 115 and 117 kDa and estimated pI of 5.69, 5.70 and 5.71, respectively. The homologies of amino acids among rat, mouse and human RGPR-p117 were at least 70%. RGPR-p117 had a leucine zipper motif. The expression of RGPR-p117 mRNA was found in the liver, kidney, heart, spleen, and brain of rats. The database search of the human RGPR-p117 showed that its gene consisted of at least 26 exons spanning approximately 4.1 kbp and localized on human chromosome 1q25.2. Furthermore, we found a cDNA clone which was highly identical to a front half part of the human RGPR-p117 cDNA, using the BLAST search of human RGPR-p117. This cDNA clone was a splicing variant of human RGPR-p117, which derived from human placental choriocar...Continue Reading

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