SIC1 cyclin-dependent protein serine/threonine kinase inhibiting protein SIC1 [Saccharomyces cerevisiae S288C] - Gene

Summary

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Official Symbol: SIC1
Official Full Name: cyclin-dependent protein serine/threonine kinase inhibiting protein SIC1
Primary source: SGD:S000004069
Locus tag: YLR079W
See related: AllianceGenome:SGD:S000004069; FungiDB:YLR079W; VEuPathDB:YLR079W
Gene type: protein coding
RefSeq status: REVIEWED
Organism: Saccharomyces cerevisiae S288C (strain: S288C)
Lineage: Eukaryota; Fungi; Dikarya; Ascomycota; Saccharomycotina; Saccharomycetes; Saccharomycetales; Saccharomycetaceae; Saccharomyces
Also known as: BYC1; SDB25
Summary: Enables cyclin-dependent protein serine/threonine kinase inhibitor activity. Involved in G1/S transition of mitotic cell cycle and negative regulation of macroautophagy. Located in cytoplasm and nucleus. [provided by Alliance of Genome Resources, Nov 2024]
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Genomic context

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See SIC1 in Genome Data Viewer

Location:: chromosome: XII

Exon count:: 1

Sequence:: Chromosome: XII; NC_001144.5 (286820..287674)

Chromosome XII - NC_001144.5 Genomic Context describing neighboring genes

Genomic regions, transcripts, and products

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Go to reference sequence details

Genomic Sequence:: NC_001144.5

Go to nucleotide: Graphics FASTA GenBank

Bibliography

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GeneRIFs: Gene References Into Functions

What's a GeneRIF?

Cdc6 is sequentially regulated by PP2A-Cdc55, Cdc14, and Sic1 for origin licensing in S. cerevisiae.
Title: Cdc6 is sequentially regulated by PP2A-Cdc55, Cdc14, and Sic1 for origin licensing in S. cerevisiae.
Studies propose that Sic1, Cdc37, and Hsp82 may orchestrate parts of the cellular starvation response by regulating transcription factor- and kinase activities.
Title: Quantitative proteomics identifies unanticipated regulators of nitrogen- and glucose starvation.
Data indicate that Sic1 function in analogy to its human counterpart p27(Kip1), whose deregulation leads to failure in timing of kinase activation and, therefore, to cancer.
Title: Molecular systems biology of Sic1 in yeast cell cycle regulation through multiscale modeling.
Ime2 does not directly catalyze Sic1 phosphorylation to target it for destabilization as Cln1,-2/Cdk1 do during the cell cycle
Title: Yeast IME2 functions early in meiosis upstream of cell cycle-regulated SBF and MBF targets.
We analyse oscillations of B-type (Clb) cyclins, focusing on the role of their inhibitor Sic1.
Title: Sic1 plays a role in timing and oscillatory behaviour of B-type cyclins.
Individually weak dispersed Sic1 phospho sites engage Cdc4 in a dynamic equilibrium. The multisite nature of this interaction confers cooperative dependence on kinase activity for Sic1 recognition & ubiquitination at equilibrium.
Title: Composite low affinity interactions dictate recognition of the cyclin-dependent kinase inhibitor Sic1 by the SCFCdc4 ubiquitin ligase.
Sic1 regulates waves of Clbs, acting as a timer in their appearance, thus controlling Cdk1-Clbs activation. The molecular mechanism is not yet fully understood but is hypothesized to occur via stoichiometric binding of Sic1 to Cdk1-Clb complexes.
Title: Unraveling interactions of cell cycle-regulating proteins Sic1 and B-type cyclins in living yeast cells: a FLIM-FRET approach.
Computational simulation revealed that an increased amount of SIC1 mRNAs lead to an amplified dispersion of Sic1 protein levels, suggesting mRNA control being critical to set timing of Sic1 downregulation and, therefore, S phase onset
Title: A low number of SIC1 mRNA molecules ensures a low noise level in cell cycle progression of budding yeast.
we discovered previously unrecognized levels of regulation of the Ace2 transcription factor and the cyclin-dependent protein kinase inhibitor Sic1
Title: New insight into the role of the Cdc34 ubiquitin-conjugating enzyme in cell cycle regulation via Ace2 and Sic1.
analysis of structure/function of a dynamic complex of the intrinsically disordered Sic1 with the Cdc4 subunit of an SCF ubiquitin ligase
Title: Structure/function implications in a dynamic complex of the intrinsically disordered Sic1 with the Cdc4 subunit of an SCF ubiquitin ligase.

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Interactions

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Products	Interactant	Other Gene	Complex	Source	Pubs	Description

General gene information

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Homology

Orthologs from OrthoDB

Gene Ontology Provided by SGD

Function	Evidence Code	Pubs
enables cyclin-dependent protein serine/threonine kinase inhibitor activity	IDA Inferred from Direct Assay more info	PubMed

Process	Evidence Code	Pubs
involved_in G1/S transition of mitotic cell cycle	IGI Inferred from Genetic Interaction more info	PubMed
involved_in negative regulation of macroautophagy	IMP Inferred from Mutant Phenotype more info	PubMed

Component	Evidence Code	Pubs
located_in cytoplasm	IDA Inferred from Direct Assay more info	PubMed
located_in cytoplasm	IEA Inferred from Electronic Annotation more info
located_in nucleus	IDA Inferred from Direct Assay more info	PubMed
located_in nucleus	IEA Inferred from Electronic Annotation more info

General protein information

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Preferred Names: cyclin-dependent protein serine/threonine kinase inhibiting protein SIC1

NP_013180.1

Cyclin-dependent kinase inhibitor (CKI); inhibitor of Cdc28-Clb kinase complexes that controls G1/S phase transition, preventing premature S phase and ensuring genomic integrity; phosphorylated by Clb5/6-Cdk1 and Cln1/2-Cdk1 kinase which regulate timing of Sic1p degradation; phosphorylation targets Sic1p for SCF(CDC4)-dependent turnover; functional homolog of mammalian Kip1