Transforming growth factor type beta 2 (TGF-beta 2) is a member of an expanding family of growth factors that regulate proliferation and differentiation of many different cell types. TGF-beta 2 binds to various receptors, one of which was shown to be a serine/threonine kinase ...
Transforming growth factor type beta 2 (TGF-beta 2) is a member of an expanding family of growth factors that regulate proliferation and differentiation of many different cell types. TGF-beta 2 binds to various receptors, one of which was shown to be a serine/threonine kinase. TGF-beta 2 is involved in wound healing, bone formation and modulation of immune functions. We report here the crystal structure of TGF-beta 2 at 2.2 A resolution, which reveals a novel monomer fold and dimer association. The monomer consists of two antiparallel pairs of beta-strands forming a flat curved surface and a separate, long alpha-helix. The disulphide-rich core has one disulphide bone pointing through a ring formed by the sequence motifs Cys-Ala-Gly-Ala-Cys and Cys-Lys-Cys, which are themselves connected through the cysteines. Two monomers are connected through a single disulphide bridge and associate such that the helix of one subunit interacts with the concave beta-sheet surface of the other. Four exposed loop regions might determine receptor specificity. The structure provides a suitable model for the TGF-beta s and other members of the super-family and is the basis for the analysis of the TGF-beta 2 interactions with the receptor.
Related Citations:
Crystallization and Preliminary X-Ray Analysis of Recombinant Human Transforming Growth Factor Beta2 Schlunegger, M.P., Cerletti, N., Cox, D.A., Mcmaster, G.K., Schmitz, A., Gruetter, M.G. (1992) FEBS Lett 303: 91
Crystal Structure of Transforming Growth Factor-Beta2: An Unusual Fold for the Superfamily Daopin, S., Piez, K.A., Ogawa, Y., Davies, D.R. (1992) Science 257: 369
Organizational Affiliation:
Department of Biotechnology, Pharmaceuticals Division, Ciba-Geigy, Basel, Switzerland.
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