1far

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RAF-1 CYSTEINE RICH DOMAIN, NMR, MINIMIZED AVERAGE STRUCTURE

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

The Raf-1 protein kinase is the best-characterized downstream effector of, activated Ras. Interaction with Ras leads to Raf-1 activation and results, in transduction of cell growth and differentiation signals. The details of, Raf-1 activation are unclear, but our characterization of a second, Ras-binding site in the cysteine-rich domain (CRD) and the involvement of, both Ras-binding sites in effective Raf-1-mediated transformation provides, insight into the molecular aspects and consequences of Ras-Raf, interactions. The Raf-1 CRD is a member of an emerging family of domains, many of which are found within signal transducing proteins. Several, contain binding sites for diacylglycerol (or phorbol esters) and, phosphatidylserine and are believed to play a role in membrane, translocation and enzyme activation. The CRD from Raf-1 does not bind, diacylglycerol but interacts with Ras and phosphatidylserine. To, investigate the ligand-binding specificities associated with CRDs, we have, determined the solution structure of the Raf-1 CRD using heteronuclear, multidimensional NMR. We show that there are differences between this, structure and the structures of two related domains from protein kinase C, (PKC). The differences are confined to regions of the CRDs involved in, binding phorbol ester in the PKC domains. Since phosphatidylserine is a, common ligand, we expect its binding site to be located in regions where, the structures of the Raf-1 and PKC domains are similar. The structure of, the Raf-1 CRD represents an example of this family of domains that does, not bind diacylglycerol and provides a framework for investigating its, interactions with other molecules.

Disease

Known diseases associated with this structure: LEOPARD syndrome 2 OMIM:[164760], Noonan syndrome 5 OMIM:[164760]

About this Structure

1FAR is a Single protein structure of sequence from Homo sapiens with as ligand. Known structural/functional Sites: and . Full crystallographic information is available from OCA.

Reference

The solution structure of the Raf-1 cysteine-rich domain: a novel ras and phospholipid binding site., Mott HR, Carpenter JW, Zhong S, Ghosh S, Bell RM, Campbell SL, Proc Natl Acad Sci U S A. 1996 Aug 6;93(16):8312-7. PMID:8710867

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