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• W2045794384 abstract "Background Asymmetric cell division in the Caenorhabditis elegans embryos requires products of par (partitioning defective) genes 1–6 and atypical protein kinase C (aPKC), whereas Cdc42 and Rac, members of the Rho family GTPases, play an essential role in cell polarity establishment in yeast and mammalian cells. However, little is known about a link between PAR proteins and the GTPases in cell polarization. Results Here we have cloned cDNAs for three human homologues of PAR6, designated PAR6α, β and γ, comprising 345, 372 and 376 amino acids, respectively. The PAR6 proteins harbour a PDZ domain and a CRIB-like motif, and directly interact with GTP-bound Rac and Cdc42 via this motif and with the aPKC isoforms PKCι/λ and PKCζ via the N-terminal head-to–head association. These interactions are not mutually exclusive, thereby allowing the PAR6 proteins to form a ternary complex with the GTPases and aPKC, both in vitro and in vivo. When PAR6 and aPKC are expressed with a constitutively active form of Rac in HeLa or COS-7 cells, these proteins co-localize to membrane ruffles, which are known to occur at the leading edge of polarized cells during cell movement. Conclusion Human PAR6 homologues most likely play an important role in the cell polarization of mammalian cells, by functioning as an adaptor protein that links activated Rac and Cdc42 to aPKC signalling." @default.
• W2045794384 created "2016-06-24" @default.
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• W2045794384 date "2001-02-01" @default.
• W2045794384 modified "2023-09-28" @default.
• W2045794384 title "Human homologues of the<i>Caenorhabditis elegans</i>cell polarity protein PAR6 as an adaptor that links the small GTPases Rac and Cdc42 to atypical protein kinase C" @default.
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• W2045794384 doi "https://doi.org/10.1046/j.1365-2443.2001.00404.x" @default.
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