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J. Biol. Chem., Vol. 275, Issue 29, 22495-22502, July 21, 2000
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From the The basement membrane protein laminin-5, a
heterotrimer of laminin
Structural Requirement of Carboxyl-terminal Globular Domains of
Laminin
3 Chain for Promotion of Rapid Cell Adhesion and Migration
by Laminin-5*
§¶,
¶,
§,
, and
§
Division of Cell Biology, Kihara Institute
for Biological Research and § Graduate School of Integrated
Sciences, Yokohama City University, 641-12 Maioka-cho, Totsuka-ku,
Yokohama 244-0813, Japan
3,
3, and
2 chains, potently promotes
cellular adhesion and motility. It has been supposed that the
carboxyl-terminal globular region of the
3 chain consisting of five
distinct domains (G1 to G5) is important for its interaction with
integrins. To clarify the function of each G domain, we transfected
cDNAs for the full-length (wild type (WT)) and five deletion
derivatives (
Gs) of the
3 chain into human fibrosarcoma cell line
HT1080, which expressed and secreted the laminin
3 and
2 chains
but not the
3 chain. The transfectants with the
3 chain cDNAs
lacking G5 (
G5), G4-5 (
G4-5),
G3-5 (
G3-5), and G2-5 (
G2-5) secreted
laminin-5 variants at levels comparable to that with WT cDNA.
However, the transfectant with the cDNA without any G domains
(
G1-5) secreted little laminin-5, suggesting that the G
domains are essential for the efficient assembly and secretion of the
heterotrimer
3
3
2. The transfectants with WT,
G5, and
G4-5 cDNAs survived in
serum-free medium longer than those with
G3-5,
G2-5, and
G1-5 cDNAs. The
transfectants with WT,
G5, and
G4-5
cDNAs secreted apparently the same size of laminin-5, which lacked
G4 and G5 due to proteolytic cleavage between G3 and G4, and these
laminin-5 forms potently promoted integrin
3
1-dependent cell adhesion
and migration. However, the laminin-5 forms of
G3-5 and
G2-5 hardly promoted the cell adhesion and motility.
These findings demonstrate that the G3 domain, but not the G4 and G5
domains, of the
3 chain is essential for the potent promotion of
cell adhesion and motility by laminin-5.
*
This work was supported by a Grant-in-aid from the Ministry
of Education, Science, Sports and Culture of Japan.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: Division of Cell
Biology, Kihara Institute for Biological Research, Yokohama City University, 642-12 Maioka-cho, Totsuka-ku, Yokohama 244-0813. Tel.:
81-45-820-1905; Fax: 81-45-820-1901; E-mail:
miyazaki@yokohama-cu.ac.jp.
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