Solution structure of GAP SH3 domain by 1H NMR and spatial arrangement of essential R
 

Solution structure of GAP SH3 domain by 1H NMR and spatial arrangement of essential Ras signaling-involved sequence.

http://www.ncbi.nlm.nih.gov/corehtml...pubmed-pmc.gif Related Articles Solution structure of GAP SH3 domain by 1H NMR and spatial arrangement of essential Ras signaling-involved sequence.

EMBO J. 1994 Mar 15;13(6):1270-9

Authors: Yang YS, Garbay C, Duchesne M, Cornille F, Jullian N, Fromage N, Tocque B, Roques BP

Src homology 3 (SH3) domains are found in numerous cytoplasmic proteins involved in intracellular signal transduction. We used 2-D 1H NMR to determine the structure of the SH3 domain of the guanosine triphosphatase-activating protein (GAP), an essential component of the Ras signaling pathway. The structure of the GAP SH3 domain (275-350) was found to be a compact beta-barrel made of six antiparallel beta-strands arranged in two roughly perpendicular beta-sheets with the acidic residues located at the surface of the protein. The Trp317, Trp319, Thr321 and Leu323 residues belonging to the sequence (317-326), which was shown to be essential for Ras signaling, formed two nearby lipophilic bulges followed by a hydrophilic domain (Arg324-Asp326). These structural data could be used to characterize the still unidentified downstream components of GAP, which are involved in Ras signaling, and to rationally design inhibitors of this pathway.

PMID: 8137811 [PubMed - indexed for MEDLINE]



Source: PubMed