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Letter

Nature Structural & Molecular Biology 9, 900–905 (1 December 2002) | doi:10.1038/nsb864

Structural characterization of a proline-driven conformational switch within the Itk SH2 domain

Robert J. Mallis , Kristine N. Brazin , D. Bruce Fulton & Amy H. Andreotti

Interleukin-2 tyrosine kinase (Itk) is a T cell-specific kinase required for a proper immune response following T cell receptor engagement. In addition to the kinase domain, Itk is composed of several noncatalytic regulatory domains, including a Src homology 2 (SH2) domain that contains a conformationally heterogeneous Pro residue.