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• W2034804273 abstract "A full-length cDNA clone encoding osteocalcin from the bullfrog, Rana catesbeiana (bone Gla-protein, BGP) has been isolated, and the complete coding sequence for the 100-amino-acid pre-pro-osteocalcin protein was determined. The amino acid sequence of Rana catesbeiana osteocalcin, especially the mature 49-amino acid sequence, is closer to the mammalian than to the fish, Sparus osteocalcin. Rana mature osteocalcin has a similarity of 67% with human or 59% with rat osteocalcin, and only 42% with fish mature osteocalcin. The 51-amino-acid pre-pro-peptide contains the expected hydrophobic leader sequence and the dibasic Arg-Arg sequence preceding the NH2-terminal Ser of the mature 49-amino-acid Rana osteocalcin. The pro-peptide sequence also contains the expected motif of polar and hydrophobic residues, which targets vitamin K-dependent gamma-carboxylation of three specific Glu residues at positions 17, 21, and 24 in the mature protein. At the native protein expression levels, extraction from Rana cortical bone in the presence of protease inhibitor cocktail resulted in the isolation of two distinct forms of osteocalcin, P-1 and P-2, with a 3:2 distribution. Using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) and amino acid sequence analysis of the N-terminal domain, we confirmed that P-1 is the intact 49-residue osteocalcin with N-terminal SNLRNAVFG., and that P-2 lacks four amino acids from the N-terminus, (NAVFG.). These results demonstrate the existence of a form of osteocalcin lacking four N-terminal amino acids in Rana bone, and that mature Rana osteocalcins remained highly conserved in their molecular evolution, especially with respect to the conservation of the C-terminal domain (residues 14-49)." @default.
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• W2034804273 date "2004-07-01" @default.
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• W2034804273 title "Characterization of the cDNA encoding bullfrog, Rana catesbeiana, osteocalcin and two forms of the protein isolated from bone*" @default.
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• W2034804273 doi "https://doi.org/10.1016/j.biochi.2004.06.004" @default.
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