The C-terminal SH3 domain of p67Ph(phox) binds its natural ligand in a reverse orientation

被引:9
作者
Finan, P
Koga, H
Zvelebil, MJ
Waterfield, MD
Kellie, S
机构
[1] LITTLEMORE HOSP, YAMANOUCHI RES INST, OXFORD OX4 4XN, ENGLAND
[2] LUDWIG INST CANC RES, LONDON W1P 8BT, ENGLAND
[3] YAMANOUCHI PHARMACEUT CO LTD, INST DRUG DISCOVERY RES, TSUKUBA, IBARAKI 305, JAPAN
[4] UCL, DEPT BIOCHEM & MOL BIOL, LONDON, ENGLAND
关键词
SH3; domain; NADPH oxidase; molecular modelling;
D O I
10.1006/jmbi.1996.0450
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Src-homology 3 (SH3) domains are small protein modules that bind to proline-rich motifs and mediate the formation of signalling complexes. SH3 domains have been implicated in the assembly of the phagocyte NADPH oxidase complex, a multicomponent enzyme responsible for the production of antimicrobial oxidants. Two components of the NADPH oxidase, p67(phax) and p47(phax), each contain two SH3 domains and we have previously shown that the SH3 domain near the carboxyl terminus of p67(phax) interacts with a proline-rich region of p47(phax). In order to gain an insight into the specificity of this interaction, a structural model of the p67(phax) SH3 domain has been produced using the known structure of the c-abl SH3 domain as a template. The model suggests that the proline-rich ligand of p47(phax) can bind to the SH3 domain in either of two orientations. In each orientation, the key residues of the SH3 domain that contact the ligand have been identified and altered by site-directed mutagenesis. The ability of the mutated SH3 domains to associate with p47(phax) from cell lysates was tested and the results provide the first evidence for the binding of a full-length protein to an SH3 domain in a reversed orientation. (C) 1996 Academic Press Limited
引用
收藏
页码:173 / 180
页数:8
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