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An Isaac Newton Institute Workshop

Protein-Protein Interactions in Vitro and in Vivo

Protein-protein interactions from a structural perspective

Authors: Janet Thornton (EMBL-EBI), Thomas Kabir (UCL), Irene Nooren (EMBL-EBI), Hannes Ponstingl (EMBL-EBI)


An update of the structural features of multimeric proteins will be presented. We have compiled low redundancy sets of homomeric proteins with different symmetry and subunit composition as well as sets of heteromeric proteins for comparison. We find significant variations between monomers and multimers and with the additional data we compare dimers, trimers, tetramers and hexamers. The variations we observe can all be seen as consequences of the hydrophobic effect, which has long been noted as a major driving force in protein folding and association. A comparison with transient complexes will also be presented.

Ponstingl, H., Kabir, T. & Thornton, J.M. (2003) Automatic Inference of Protein Quaternary Structure from Crystals. J. Appl. Cryst. 36, 1116-1122.

Nooren, I.M.A. & Thornton, J.M. (2003a) Structural characterisation and functional significance of transient protein-protein interactions J. Mol. Biol. 325, 991-1018. PMID: 12527304

Nooren, I. & Thornton, J.M. (2003b) Diversity of protein-protein interactions. EMBO Journal. 22, 3486-3492. PMID: 12853464