Computational design of an integrin I domain stabilized in the open high affinity conformation

Motomu Shimaoka, Julia M. Shifman, Hua Jing, Junichi Takagi, Stephen L. Mayo, Timothy A. Springer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

Abstract

We have taken a computational approach to design mutations that stabilize a large protein domain of ~200 residues in two alternative conformations. Mutations in the hydrophobic core of the αMβ2 integrin I domain were designed to stabilize the crystallographically defined or closed conformers. When expressed on the cell surface as part of the intact heterodimeric receptor, binding of the designed open and closed I domains to the ligand iC3b, a form of the complement component C3, was either increased or decreased, respectively, compared to wild type. Moreover, when expressed in isolation from other integrin domains using an artificial transmembrane domain, designed open I domains were active in ligand binding, whereas designed closed and wild type I domains were inactive. Comparison to a human expert designed open mutant showed that the computationally designed mutants are far more active. Thus, computational design can be used to stabilize a molecule in a desired conformation, and conformational change in the I domain is physiologically relevant to regulation of ligand binding.

Original languageAmerican English
Pages (from-to)674-678
Number of pages5
JournalNature Structural Biology
Volume7
Issue number8
DOIs
StatePublished - Aug 2000
Externally publishedYes

Bibliographical note

Funding Information:
We thank M. Ferzly for technical assistance. This work was supported by the NIH.

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