Fibrillin-1 interactions with fibulins depend on the first hybrid domain and provide an adaptor function to tropoelastin

Ehab El-Hallous, Takako Sasaki, Dirk Hubmacher, Melkamu Getie, Kerstin Tiedemann, Jürgen Brinckmann, Boris Bätge, Elaine C. Davis, Dieter P. Reinhardt

Research output: Contribution to journalArticlepeer-review

101 Scopus citations

Abstract

Fibrillin-containing microfibrils in elastic and nonelastic extracellular matrices play important structural and functional roles in various tissues, including blood vessels, lung, skin, and bone. Microfibrils are supramolecular aggregates of several protein and nonprotein components. Recently, a large region in the N-terminal portion of fibrillin-1 was characterized as a multifunctional protein interaction site, including binding sites for fibulin-2 and -5 among others. Using a panel of recombinant fibrillin-1 swapped domain and deletion fragments, we demonstrate here that the conserved first hybrid domain in fibrillin-1 is essential for binding to fibulin-2, -4, and -5. Fibulin-3 and various isoforms of fibulin-1 did not interact with fibrillin-1. Although the first hybrid domain in fibrillin-1 is located in close vicinity to the self-assembly epitope, binding of fibulin-2, -4, and -5 did not interfere with self-assembly. However, these fibulins can associate with microfibrils at various levels of maturity. Formation of ternary complexes between fibrillin-1, fibulins, and tropoelastin demonstrated that fibulin-2 and -5 but much less fibulin-4, are able to act as molecular adaptors between fibrillin-1 and tropoelastin.

Original languageEnglish
Pages (from-to)8935-8946
Number of pages12
JournalJournal of Biological Chemistry
Volume282
Issue number12
DOIs
StatePublished - 23 Mar 2007
Externally publishedYes

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