TY - JOUR
T1 - A major estrogen-regulated protein secreted from the liver of xenopus Laevis is a member of the serpin superfamily
T2 - Nucleotide sequence of cDNA and hormonal Induction of mRNA
AU - Holland, Lené J.
AU - Suksang, Chanatip
AU - Wall, Amy A.
AU - Roberts, Lewis R.
AU - Moser, David R.
AU - Bhattacharya, Anuradha
N1 - Copyright:
Copyright 2004 Elsevier B.V., All rights reserved.
PY - 1992/4/5
Y1 - 1992/4/5
N2 - Estrogen treatment of Xenopus frogs causes four mRNAs to become highly abundant in the liver. Three of these mRNAs have been previously identified as coding for vitellogenin, ferritin, and serum retinol binding protein. We show here that the fourth abundant liver messenger RNA comprises about 1500 nucleotides and codes for a 45-kDa secreted protein, designated Ep45. A clone complementary to Ep45 mRNA was isolated, and its identity was confirmed by hybridization selection of mRNA that translated in vitro into the Ep45 precursor. Nucleotide sequence analysis of the nearly full length cDNA revealed a total length of 1454 base pairs consisting of: 36 nucleotides of the 5′ noncoding region, 1308 base pairs encoding an open reading frame of 436 amino acids, and 110 nucleotides of the 3′ untranslated region. Ep45 mRNA may originate from as many as four closely spaced transcription start sites, which are 15 to 21 bases upstream of the first nucleotide of the cDNA clone. The Xenopus laevis genome appears to contain a single Ep45 gene. The deduced amino acid sequence indicates that Ep45 has features typical of a secreted protein, including a signal peptide of 16 amino acids and three potential sites for N-linked glycosylation, and is related to the serine protease inhibitors, a large family of proteins with very diverse physiological functions. Ep45 mRNA was absent in the liver of normal male frogs and increased at least 100-fold in response to estradiol-17β. Thus, both Ep45 and vitellogenin mRNAs are switched from undetectable to very high levels, a pattern of expression not found for any other mRNAs in Xenopus liver.
AB - Estrogen treatment of Xenopus frogs causes four mRNAs to become highly abundant in the liver. Three of these mRNAs have been previously identified as coding for vitellogenin, ferritin, and serum retinol binding protein. We show here that the fourth abundant liver messenger RNA comprises about 1500 nucleotides and codes for a 45-kDa secreted protein, designated Ep45. A clone complementary to Ep45 mRNA was isolated, and its identity was confirmed by hybridization selection of mRNA that translated in vitro into the Ep45 precursor. Nucleotide sequence analysis of the nearly full length cDNA revealed a total length of 1454 base pairs consisting of: 36 nucleotides of the 5′ noncoding region, 1308 base pairs encoding an open reading frame of 436 amino acids, and 110 nucleotides of the 3′ untranslated region. Ep45 mRNA may originate from as many as four closely spaced transcription start sites, which are 15 to 21 bases upstream of the first nucleotide of the cDNA clone. The Xenopus laevis genome appears to contain a single Ep45 gene. The deduced amino acid sequence indicates that Ep45 has features typical of a secreted protein, including a signal peptide of 16 amino acids and three potential sites for N-linked glycosylation, and is related to the serine protease inhibitors, a large family of proteins with very diverse physiological functions. Ep45 mRNA was absent in the liver of normal male frogs and increased at least 100-fold in response to estradiol-17β. Thus, both Ep45 and vitellogenin mRNAs are switched from undetectable to very high levels, a pattern of expression not found for any other mRNAs in Xenopus liver.
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M3 - Article
C2 - 1551912
AN - SCOPUS:0026656330
SN - 0021-9258
VL - 267
SP - 7053
EP - 7059
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 10
ER -