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The role of the Src homology 3-Src homology 2 interface in the regulation of Src kinases

The role of the Src homology 3-Src homology 2 interface in the regulation of Src kinases
The role of the Src homology 3-Src homology 2 interface in the regulation of Src kinases
The regulatory fragment of Src kinases, comprising Src homology (SH) 3 and SH2 domains, is responsible for controlled repression of kinase activity. We have used a multidisciplinary approach involving crystallography, NMR, and isothermal titration calorimetry to study the regulatory fragment of Fyn (FynSH32) and its interaction with a physiological activator: a fragment of focal adhesion kinase that contains both phosphotyrosine and polyproline motifs. Although flexible, the preferred disposition of SH3 and SH2 domains in FynSH32 resembles the inactive forms of Hck and Src, differing significantly from LckSH32. This difference, which results from variation in the SH3-SH2 linker sequences, will affect the potential of the regulatory fragments to repress kinase activity. This surprising result implies that the mechanism of repression of Src family members may vary, explaining functional distinctions between Fyn and Lck. The interaction between FynSH32 and focal adhesion kinase is restricted to the canonical SH3 and SH2 binding sites and does not affect the dynamic independence of the two domains. Consequently, the interaction shows no enhancement by an avidity effect. Such an interaction may have evolved to gain specificity through an extended recognition site while maintaining rapid dissociation after signaling.
0021-9258
17199-17205
Arold, S.T.
090f41a6-3696-4377-8427-a952d145fcca
Ulmer, T.S.
6a7fbd4d-5a48-4945-9f58-ff79336bfd85
Mulhern, T.D.
0af28e04-e9e8-4bc2-b530-de034c9fb14d
Werner, J.M.
1b02513a-8310-4f4f-adac-dc2a466bd115
Ladbury, J.E.
fd560b78-1cb4-4137-9f66-1141b2f7371d
Campbell, I.D.
36f9eac7-5354-4334-9d77-dc660f260ef1
Noble, M.E.M.
060fccbc-c576-461f-b7bf-c611fa57bd23
Arold, S.T.
090f41a6-3696-4377-8427-a952d145fcca
Ulmer, T.S.
6a7fbd4d-5a48-4945-9f58-ff79336bfd85
Mulhern, T.D.
0af28e04-e9e8-4bc2-b530-de034c9fb14d
Werner, J.M.
1b02513a-8310-4f4f-adac-dc2a466bd115
Ladbury, J.E.
fd560b78-1cb4-4137-9f66-1141b2f7371d
Campbell, I.D.
36f9eac7-5354-4334-9d77-dc660f260ef1
Noble, M.E.M.
060fccbc-c576-461f-b7bf-c611fa57bd23

Arold, S.T., Ulmer, T.S., Mulhern, T.D., Werner, J.M., Ladbury, J.E., Campbell, I.D. and Noble, M.E.M. (2001) The role of the Src homology 3-Src homology 2 interface in the regulation of Src kinases. The Journal of Biological Chemistry, 276 (20), 17199-17205. (doi:10.1074/jbc.M011185200).

Record type: Article

Abstract

The regulatory fragment of Src kinases, comprising Src homology (SH) 3 and SH2 domains, is responsible for controlled repression of kinase activity. We have used a multidisciplinary approach involving crystallography, NMR, and isothermal titration calorimetry to study the regulatory fragment of Fyn (FynSH32) and its interaction with a physiological activator: a fragment of focal adhesion kinase that contains both phosphotyrosine and polyproline motifs. Although flexible, the preferred disposition of SH3 and SH2 domains in FynSH32 resembles the inactive forms of Hck and Src, differing significantly from LckSH32. This difference, which results from variation in the SH3-SH2 linker sequences, will affect the potential of the regulatory fragments to repress kinase activity. This surprising result implies that the mechanism of repression of Src family members may vary, explaining functional distinctions between Fyn and Lck. The interaction between FynSH32 and focal adhesion kinase is restricted to the canonical SH3 and SH2 binding sites and does not affect the dynamic independence of the two domains. Consequently, the interaction shows no enhancement by an avidity effect. Such an interaction may have evolved to gain specificity through an extended recognition site while maintaining rapid dissociation after signaling.

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Published date: 1 May 2001

Identifiers

Local EPrints ID: 56068
URI: http://eprints.soton.ac.uk/id/eprint/56068
ISSN: 0021-9258
PURE UUID: 50e06e4c-bb44-4b75-811a-3443122b91a4
ORCID for J.M. Werner: ORCID iD orcid.org/0000-0002-4712-1833

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Date deposited: 07 Aug 2008
Last modified: 16 Mar 2024 03:36

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Contributors

Author: S.T. Arold
Author: T.S. Ulmer
Author: T.D. Mulhern
Author: J.M. Werner ORCID iD
Author: J.E. Ladbury
Author: I.D. Campbell
Author: M.E.M. Noble

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