Crystal structure of a ternary FGF-FGFR-heparin complex reveals a dual role for heparin in FGFR binding and dimerization

Joseph Schlessinger, Alexander N. Plotnikov, Omar A. Ibrahimi, Anna V. Eliseenkova, Brian K. Yeh, Avner Yayon, Robert J. Linhardt, Moosa Mohammadi

Research output: Contribution to journalArticlepeer-review

1008 Scopus citations

Abstract

The crystal structure of a dimeric 2:2:2 FGF:FGFR:heparin ternary complex at 3 Å resolution has been determined. Within each 1:1 FGF:FGFR complex, heparin makes numerous contacts with both FGF and FGFR, thereby augmenting FGF-FGFR binding. Heparin also interacts with FGFR in the adjoining 1:1 FGF:FGFR complex to promote FGFR dimerization. The 6-O-sulfate group of heparin plays a pivotal role in mediating both interactions. The unexpected stoichiometry of heparin binding in the structure led us to propose a revised model for FGFR dimerization. Biochemical data in support of this model are also presented. This model provides a structural basis for FGFR activation by small molecule heparin analogs and may facilitate the design of heparin mimetics capable of modulating FGF signaling.

Original languageEnglish
Pages (from-to)743-750
Number of pages8
JournalMolecular Cell
Volume6
Issue number3
DOIs
StatePublished - 2000
Externally publishedYes

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