tropomyosin TPM2, L000002329, YIL138C
Minor isoform of tropomyosin; binds to and stabilizes actin cables and filaments, which direct polarized cell growth and the distribution of several organelles; appears to have distinct and also overlapping functions with Tpm1p; TPM2 has a paralog, TPM1, that arose from the whole genome duplication
Saccharomyces cerevisiae (S288c)


L000001832, YIL068C
Essential 88kDa subunit of the exocyst complex; the exocyst mediates polarized targeting and tethering of post-Golgi secretory vesicles to active sites of exocytosis at the plasma membrane prior to SNARE-mediated fusion; anchors the assembled complex to sites of secretion; interacts with SM-like protein and SNARE regulator Sec1p and may recruit it to sites of secretion; interacts with Sec9p and inhibits formation of the t-SNARE complex between Sec9p and Sso1p
Saccharomyces cerevisiae (S288c)

Phenotypic Suppression

A genetic interaction is inferred when mutation or over expression of one gene results in suppression of any phenotype (other than lethality/growth defect) associated with mutation or over expression of another gene.


The GAP activity of Msb3p and Msb4p for the Rab GTPase Sec4p is required for efficient exocytosis and actin organization.

Gao XD, Albert S, Tcheperegine SE, Burd CG, Gallwitz D, Bi E

Polarized growth in Saccharomyces cerevisiae is thought to occur by the transport of post-Golgi vesicles along actin cables to the daughter cell, and the subsequent fusion of the vesicles with the plasma membrane. Previously, we have shown that Msb3p and Msb4p genetically interact with Cdc42p and display a GTPase-activating protein (GAP) activity toward a number of Rab GTPases in vitro. ... [more]

J. Cell Biol. Aug. 18, 2003; 162(4);635-46 [Pubmed: 12913108]


  • Low Throughput

Ontology Terms

  • phenotype: actin cytoskeleton morphology (APO:0000120)

Additional Notes

  • deletion of sec6 increases polarized organization of actin cables from o% in a tpm1/tpm2 double mutant to 51%
  • genetic complex

Curated By

  • BioGRID