期刊
PLANTA
卷 216, 期 1, 页码 136-139出版社
SPRINGER-VERLAG
DOI: 10.1007/s00425-002-0915-1
关键词
C-terminal autoinhibitory domain; H+-ATPase; fusicoccin; Nicotiana; 14-3-3
The plant plasma membrane H+-ATPase contains a C-terminal autoinhibitory domain whose displacement from the catalytic site is caused by binding of regulatory 14-3-3 proteins. Members of the highly conserved 14-3-3 family bind their individual target proteins in a sequence-specific and phosphorylation-dependent manner within a central groove, the latter characterized by the presence of highly invariant residues. However, an atypical binding site for 14-3-3s within the H+-ATPase has been identified that does not resemble any other 14-3-3 binding motif. Combination of site-directed mutagenesis with glutathione S-transferase pull-down assays points to the importance of the central 14-3-3 groove for the interaction with the apparently unique site of the H+-ATPase. Furthermore, a 14-3-3 dimer is essential for binding such unusual motif.
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