Yeast centrin Cdc31 is linked to the nuclear mRNA export machinery.
Centrins are calmodulin-like proteins that function in the duplication of microtubule-organizing centres. Here we describe a new function of the yeast centrin Cdc31. We show that overproduction of a sequence, termed CID, in the carboxy-terminal domain of the nuclear export factor Sac3 titrates Cdc31, causing a dominant-lethal phenotype and a block in spindle pole body (SPB) duplication. Under normal conditions, the CID motif recruits Cdc31 and Sus1 (a subunit of the SAGA transcription complex) to the Sac3-Thp1 complex, which functions in mRNA export together with specific nucleoporins at the nuclear basket. A previously reported cdc31 temperature-sensitive allele, which is neither defective in SPB duplication nor Kic1 kinase activation, induces mRNA export defects. Thus, Cdc31 has an unexpected link to the mRNA export machinery.
Biochemie-Zentrum der Universität Heidelberg (BZH), Im Neuenheimer Feld 328, D-69120 Heidelberg, Germany.
Tamás
T
Fischer
Susana
S
Rodríguez-Navarro
Gislene
G
Pereira
Attila
A
Rácz
Elmar
E
Schiebel
Ed
E
Hurt
D021581:Active Transport, Cell Nucleus; D002135:Calcium-Binding Proteins / Q000378:metabolism / Q000502:physiology*; D018797:Cell Cycle Proteins / Q000378:metabolism / Q000502:physiology*; D005656:Fungal Proteins / Q000378:metabolism / Q000502:physiology; D009687:Nuclear Proteins / Q000378:metabolism; D029543:Nucleocytoplasmic Transport Proteins; D018272:Porins; D011485:Protein Binding; D012333:RNA, Messenger / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000378:metabolism; D012261:Ribonucleoproteins / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism; D008941:Spindle Apparatus / Q000378:metabolism
C083769:CDC31 protein, S cerevisiae; D002135:Calcium-Binding Proteins; D018797:Cell Cycle Proteins; D005656:Fungal Proteins; D009687:Nuclear Proteins; D029543:Nucleocytoplasmic Transport Proteins; D018272:Porins; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D012261:Ribonucleoproteins; C103382:SAC3 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; C481300:Sus1 protein, S cerevisiae; C476348:Thp1 protein, S cerevisiae