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Originally published In Press as doi:10.1074/jbc.M212715200 on March 6, 2003
J. Biol. Chem., Vol. 278, Issue 20, 18491-18498, May 16, 2003
Domains in Tropoelastin That Mediate Elastin Deposition
in Vitro and in Vivo*
Beth A.
Kozel ,
Hiroshi
Wachi§,
Elaine
C.
Davis¶, and
Robert P.
Mecham
From the Department of Cell Biology and Physiology,
Washington University School of Medicine, St. Louis, Missouri 63110, the § Department of Clinical Chemistry, Hoshi University
School of Pharmacy, Tokyo 142-850, Japan, and the
¶ Department of Anatomy and Cell Biology, McGill University,
Montreal, Quebec H3A 2B2, Canada
Elastic fiber assembly is a complicated process
involving multiple different proteins and enzyme activities. However,
the specific protein-protein interactions that facilitate elastin polymerization have not been defined. To identify domains in the tropoelastin molecule important for the assembly process, we utilized an in vitro assembly model to map sequences within
tropoelastin that facilitate its association with fibrillin-containing
microfibrils in the extracellular matrix. Our results show that an
essential assembly domain is located in the C-terminal region of the
molecule, encoded by exons 29-36. Fine mapping studies using an exon
deletion strategy and synthetic peptides identified the hydrophobic
sequence in exon 30 as a major functional element in this region and
suggested that the assembly process is driven by the propensity of this sequence to form -sheet structure. Tropoelastin molecules lacking the C-terminal assembly domain expressed as transgenes in mice did not
assemble nor did they interfere with assembly of full-length normal
mouse elastin. In addition to providing important information about
elastin assembly in general, the results of this study suggest how
removal or alteration of the C terminus through stop or frameshift mutations might contribute to the elastin-related diseases
supravalvular aortic stenosis and cutis laxa.
*
This work was supported by Grants HL53325, HL62295, and
HL61006 from the National Institutes of Health and by a grant from the
National Marfan Foundation.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: Dept. of Cell
Biology and Physiology, Washington University School of Medicine, Campus Box 8228, 660 South Euclid Ave., St. Louis, MO 63110. Tel.: 314-362-2254; Fax: 314-362-2252; E-mail:
bmecham@cellbiology.wustl.edu.
Copyright © 2003 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2003 by the American Society for Biochemistry and Molecular Biology.
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