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Genetic interactions link ARF1, YPT31/32 and TRS130.

A genetic screen for synthetic lethal interactions with arf1(-) identified a recessive mutation in TRS130, one of 10 components in the trafficking protein particle (TRAPP) complex (Sacher et al., 2000). As TRS130 is an essential gene, the synthetic lethal allele (trs130-101) is a novel one that requires ARF1 for viability. This allele was found to exhibit no defects in secretory function, i.e. processing of carboxypeptidase Y or invertase. YPT31 and YPT32 were identified in a subsequent screen as high-copy suppressors of arf1(-)trs130-101. Increasing the gene dosage of YPT31/32 also suppressed lethality resulting from deletion of TRS130 or TRS120 but not three other essential TRAPP subunit-encoding genes. Although unable to suppress defects in several alleles of ARF1, increasing the gene dosage of YPT31/32 suppressed the cold sensitivity of gcs1(-), an Arf GTPase-activating protein (GAP). Thus, these genetic interactions provide initial evidence for linkage of Arf and TRAPP signalling and for Ypt31/32 proteins functioning downstream of both components in the TRAPP complex and of Arf signalling via the Gcs1 Arf GAP.[1]

References

  1. Genetic interactions link ARF1, YPT31/32 and TRS130. Zhang, C.J., Bowzard, J.B., Greene, M., Anido, A., Stearns, K., Kahn, R.A. Yeast (2002) [Pubmed]
 
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