Suppressors of YCK-encoded yeast casein kinase 1 deficiency define the four subunits of a novel clathrin AP-like complex

Heather R. Panek, J. David Stepp, Holly M. Engle, Kim M. Marks, Philip K. Tan, Sandra Lemmon, Lucy C. Robinson

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

In Saccharomyces cerevisiae, the redundant YCK1 and YCK2 genes (Yeast Casein Kinase 1) are required for viability. We describe here the molecular analysis of four mutations that eliminate the requirement for Yck activity. These mutations alter proteins that resemble the four subunits of clathrin adaptors (APs), with highest sequence similarity to those of the recently identified AP-3 complex. The four yeast subunits are associated in a high-molecular-weight complex. These proteins have no essential function and are not redundant for function with other yeast AP-related proteins. Combination of suppressor mutations with a clathrin heavy chain mutation (chc1-ts) confers no synthetic growth defects. However, a yck(ts) mutation shows a strong synthetic growth defect with chc1-ts. Moreover, endocytosis of Ste3p is dramatically decreased in yck(ts) cells and is partially restored by the AP suppressor mutations. These results suggest that vesicle trafficking at the plasma membrane requires the activity of Yck protein kinases, and that the new AP-related complex may participate in this process.

Original languageEnglish
Pages (from-to)4194-4204
Number of pages11
JournalEMBO Journal
Volume16
Issue number14
DOIs
StatePublished - Jul 16 1997
Externally publishedYes

Fingerprint

Casein Kinase I
Vesicular Transport Adaptor Proteins
Yeast
Yeasts
Genetic Suppression
Mutation
Clathrin Heavy Chains
Defects
Proteins
Cell membranes
Growth
Endocytosis
Protein Kinases
Saccharomyces cerevisiae
Genes
Molecular Weight
Molecular weight
Cell Membrane

Keywords

  • Casein kinase 1
  • Clathrin adaptors
  • Vesicular trafficking

ASJC Scopus subject areas

  • Genetics
  • Cell Biology

Cite this

Suppressors of YCK-encoded yeast casein kinase 1 deficiency define the four subunits of a novel clathrin AP-like complex. / Panek, Heather R.; Stepp, J. David; Engle, Holly M.; Marks, Kim M.; Tan, Philip K.; Lemmon, Sandra; Robinson, Lucy C.

In: EMBO Journal, Vol. 16, No. 14, 16.07.1997, p. 4194-4204.

Research output: Contribution to journalArticle

Panek, Heather R. ; Stepp, J. David ; Engle, Holly M. ; Marks, Kim M. ; Tan, Philip K. ; Lemmon, Sandra ; Robinson, Lucy C. / Suppressors of YCK-encoded yeast casein kinase 1 deficiency define the four subunits of a novel clathrin AP-like complex. In: EMBO Journal. 1997 ; Vol. 16, No. 14. pp. 4194-4204.
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