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J. Biol. Chem., Vol. 278, Issue 20, 18045-18049, May 16, 2003
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From the Wellcome Trust Centre for Cell-Matrix Research, School of
Biological Sciences, University of Manchester, Stopford Building 2.205, Oxford Road, Manchester M13 9PT, United Kingdom
Bone morphogenetic protein-1 (BMP-1) is a shorter
spliced variant of mammalian tolloid (mTld), both of which cleave the
C-propeptides of type I procollagen during the synthesis of
extracellular matrix collagen fibrils. The fact that BMP-1 and mTld
both exhibit procollagen C-proteinase (PCP) activity and that BMP-1 is
the smaller variant might indicate that BMP-1 comprises the minimal
required sequences for PCP activity. BMP-1 comprises a
metalloproteinase domain, three CUB domains, and an epidermal growth
factor (EGF)-like domain, which is located between the second and third
CUB (complement components C1r/C1s, the sea urchin
protein Uegf, and BMP-1) domains. In this study
we showed the following. 1) The CUB1 domain is required for secretion
of the molecule. Domain swapping experiments, in which CUB1 and other
CUB domains were interchanged, resulted in retention of the proteins by
cells. Therefore, CUB1 and its location immediately adjacent to the
metalloproteinase domain are essential for secretion of the protein. 2)
Mutants lacking the EGF-like and CUB3 domains exhibited full
C-proteinase activity. In contrast, mutants lacking the CUB2 domain
were poor C-proteinases. 3) Further studies showed that Glu-483
on the
Bone Morphogenetic Protein-1 (BMP-1)
IDENTIFICATION OF THE MINIMAL DOMAIN STRUCTURE FOR PROCOLLAGEN
C-PROTEINASE ACTIVITY*
4-
5 loop of CUB2 is essential for C-proteinase activity of
BMP-1. In conclusion, the study showed that the minimal domain
structure for PCP activity is considerably shorter than expected
and comprises the metalloproteinase domain and the CUB1 and CUB2
domains of BMP-1.
*
These studies were supported by grants from the Wellcome
Trust (to K. E. K.) and by a Wellcome Trust prize studentship (to N. H.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed. Tel.: 44-161-275-5086;
Fax: 44-161-275-1505; E-mail: karl.kadler@man.ac.uk.
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