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PMID:15215315

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Citation

Gao, XD, Caviston, JP, Tcheperegine, SE and Bi, E (2004) Pxl1p, a paxillin-like protein in Saccharomyces cerevisiae, may coordinate Cdc42p and Rho1p functions during polarized growth. Mol. Biol. Cell 15:3977-85

Abstract

Rho-family GTPases Cdc42p and Rho1p play critical roles in the budding process of the yeast Saccharomyces cerevisiae. However, it is not clear how the functions of these GTPases are coordinated temporally and spatially during this process. Based on its ability to suppress cdc42-Ts mutants when overexpressed, a novel gene PXL1 was identified. Pxl1p resembles mammalian paxillin, which is involved in integrating various signaling events at focal adhesion. Both proteins share amino acid sequence homology and structural organization. When expressed in yeast, chicken paxillin localizes to the sites of polarized growth as Pxl1p does. In addition, the LIM domains in both proteins are the primary determinant for targeting the proteins to the cortical sites in their native cells. These data strongly suggest that Pxl1p is the "ancient paxillin" in yeast. Deletion of PXL1 does not produce any obvious phenotype. However, Pxl1p directly binds to Rho1p-GDP in vitro, and inhibits the growth of rho1-2 and rho1-3 mutants in a dosage-dependent manner. The opposite effects of overexpressed Pxl1p on cdc42 and rho1 mutants suggest that the functions of Cdc42p and Rho1p may be coordinately regulated during budding and that Pxl1p may be involved in this coordination.

Links

PubMed PMC515332 Online version:10.1091/mbc.E04-01-0079

Keywords

Adaptor Proteins, Signal Transducing; Amino Acid Sequence; Animals; Carrier Proteins/chemistry; Carrier Proteins/genetics; Carrier Proteins/metabolism; Cell Polarity; Chickens; Cytoskeletal Proteins/genetics; Cytoskeletal Proteins/metabolism; Genes, Fungal; Molecular Sequence Data; Mutation; Paxillin; Phosphoproteins/genetics; Phosphoproteins/metabolism; Protein Binding; Recombinant Proteins/genetics; Recombinant Proteins/metabolism; Saccharomyces cerevisiae/cytology; Saccharomyces cerevisiae/genetics; Saccharomyces cerevisiae/growth & development; Saccharomyces cerevisiae/metabolism; Saccharomyces cerevisiae Proteins/chemistry; Saccharomyces cerevisiae Proteins/genetics; Saccharomyces cerevisiae Proteins/metabolism; Sequence Homology, Amino Acid; Signal Transduction; cdc42 GTP-Binding Protein, Saccharomyces cerevisiae/genetics; cdc42 GTP-Binding Protein, Saccharomyces cerevisiae/metabolism; rho GTP-Binding Proteins/genetics; rho GTP-Binding Proteins/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

YEAST:PXL1

enables

GO:0005094: Rho GDP-dissociation inhibitor activity

ECO:0000316: genetic interaction evidence used in manual assertion

SGD:S000006369

F

Seeded From UniProt

complete

YEAST:PXL1

involved_in

GO:0035023: regulation of Rho protein signal transduction

ECO:0000316: genetic interaction evidence used in manual assertion

SGD:S000004219
SGD:S000006369

P

Seeded From UniProt

complete

YEAST:PXL1

involved_in

GO:0035023: regulation of Rho protein signal transduction

ECO:0000353: physical interaction evidence used in manual assertion

SGD:S000006369

P

Seeded From UniProt

complete


See also

References

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