Document Detail


The bioactivity of human bone morphogenetic protein-15 is sensitive to C-terminal modification: characterization of the purified untagged processed mature region.
MedLine Citation:
PMID:  20937357     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Oocyte-derived bone morphogenetic protein-15 (BMP15) is critical for the regulation of mammalian fertility. Previously we have found that a C-terminal His(6)-tag destroys the bioactivity of growth differentiation-9 (GDF9, a homolog of BMP15). In this study we found that recombinant human BMP15 is produced by HEK-293T cells in an active form, but the bioactivity is lost by C-terminal modification, specifically, fusion to a Flag tag. After purification the mature BMP15 wt is active in transcriptional reporter assays specific for Smad1/5/8 in human granulosa-luteal (hGL) and COV434 granulosa tumor cells, whereas BMP15 with a carboxy-terminal Flag tag remains inactive. Using these same cell models we found that treatment with purified mature BMP15 wt causes a rapid phosphorylation of Smad1. The purified BMP15 wt is a potent stimulator of rat granulosa cell DNA synthesis, which could be antagonized by the BMPRII ectodomain-Fc fusion molecule, whereas the BMP15C-Flag was completely inactive. Further, the BMP15 wt form is a potent stimulator of inhibin B production in hGL cells. We found that the purified BMP15 wt consists of P16 and -17, both of which are post-translationally modified forms. This is the first characterization of a purified untagged human BMP15 mature region, which is stable and highly bioactive in human and rodent granulosa cells and as such is of importance for studies on human fertility.
Authors:
Minna M Pulkki; Samu Myllymaa; Arja Pasternack; Stanley Lun; Helen Ludlow; Ahmed Al-Qahtani; Olexandr Korchynskyi; Nigel Groome; Jennifer L Juengel; Nisse Kalkkinen; Mika Laitinen; Olli Ritvos; David G Mottershead
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-16
Journal Detail:
Title:  Molecular and cellular endocrinology     Volume:  332     ISSN:  1872-8057     ISO Abbreviation:  Mol. Cell. Endocrinol.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7500844     Medline TA:  Mol Cell Endocrinol     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  106-15     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.
Affiliation:
Department of Bacteriology and Immunology, Haartman Institute, 00014 University of Helsinki, Helsinki, Finland. Minna.Pulkki@helsinki.fi
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