title: Characterization of the post-translational modification of recombinant human BMP-15 mature protein.
abstract: Bone morphogenetic protein-15 (BMP-15) is an oocyte-secreted factor critical for the regulation of ovarian physiology. When recombinant human BMP-15 (rhBMP-15) produced in human embryonic kidney 293 cells was subjected to SDS-PAGE analysis, two mature protein forms corresponding to 16 kDa (P16) and 17 kDa (P17) were observed. Despite the physiological relevance and critical function of BMP-15 in female reproduction, little is known about the structure of rhBMP-15. Here, we have analyzed the structure of the rhBMP-15 mature proteins (P16 and P17) using state-of-the-art proteomics technology. Our findings are as follows: (1) the N-terminal amino acid of P16 and P17 is pyroglutamic acid; (2) the Ser residue at the sixth position of P16 is phosphorylated; (3) P17 is O-glycosylated at Thr10; and (4) the C-terminal amino acid of P16 and P17 is truncated. These findings are the first knowledge of the structure of rhBMP-15 mature protein toward understanding the molecular basis of BMP-15 function and could provide an important contribution to the rapidly progressing research area involving oocyte-specific growth factors in modulation of female fertility.
authors.affiliation: Antibody Research Laboratories, Pharmaceutical Research Center, Kyowa Hakko Kogyo Co., Ltd., Tokyo 194-8533, Japan.
authors.forename: Seiji
authors.initials: S
authors.lastname: Saito
authors.forename: Keiichi
authors.initials: K
authors.lastname: Yano
authors.forename: Shweta
authors.initials: S
authors.lastname: Sharma
authors.forename: Heather E
authors.initials: HE
authors.lastname: McMahon
authors.forename: Shunichi
authors.initials: S
authors.lastname: Shimasaki
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D055430:Bone Morphogenetic Protein 15; D006031:Glycosylation; D055429:Growth Differentiation Factor 9; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000737:chemistry* / Q000378:metabolism*; D008969:Molecular Sequence Data; D010766:Phosphorylation; D011499:Protein Processing, Post-Translational; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D016415:Sequence Alignment
chemical_list: C525901:BMP15 protein, human; D055430:Bone Morphogenetic Protein 15; C525897:GDF9 protein, human; D055429:Growth Differentiation Factor 9; D036341:Intercellular Signaling Peptides and Proteins; D011994:Recombinant Proteins