Previous Article | Next Article ![]()
Mol. Cell. Biol., 04 1995, 2304-2310, Vol 15, No. 4
K Datta, TF Franke, TO Chan, A Makris, SI Yang, DR Kaplan, DK Morrison, EA Golemis and PN Tsichlis
The cytoplasmic serine-threonine protein kinase coded for by the c-akt
proto-oncogene features a protein kinase C-like catalytic domain and a
unique NH2-terminal domain (AH domain). The AH domain is a member of a
domain superfamily whose prototype was observed in pleckstrin (pleckstrin
homology, or PH, domain). In this communication, we present evidence that
the AH/PH domain is a domain of protein-protein interaction which mediates
the formation of Akt protein complexes. The interaction between c-akt AH/PH
domains is highly specific, as determined by the failure of this domain to
bind AKT2. The AH/PH domain- mediated interactions depend on the integrity
of the entire domain. Akt molecules with deletions of the NH2-terminal
portion (amino acids 11 to 60) and AH/PH constructs with deletions of the
C-terminal portion of this domain (amino acids 107 to 147) fail to interact
with c-akt. To determine the significance of these findings, we carried out
in vitro kinase assays using Akt immunoprecipitates from serum-starved and
serum- starved, platelet-derived growth factor-stimulated NIH 3T3 cells.
Addition of maltose-binding protein-AH/PH fusion recombinant protein, which
is expected to bind Akt, to the immunoprecipitates from serum- starved
cells induced the activation of the Akt kinase.
Copyright © 1995, American Society for Microbiology
AH/PH domain-mediated interaction between Akt molecules and its potential role in Akt regulation
Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»