Cyclin-H is a
protein
Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residue (biochemistry), residues. Proteins perform a vast array of functions within organisms, including Enzyme catalysis, catalysing metab ...
that in humans is encoded by the ''CCNH''
gene
In biology, the word gene has two meanings. The Mendelian gene is a basic unit of heredity. The molecular gene is a sequence of nucleotides in DNA that is transcribed to produce a functional RNA. There are two types of molecular genes: protei ...
.
Function
The protein encoded by this gene belongs to the highly conserved
cyclin
Cyclins are proteins that control the progression of a cell through the cell cycle by activating cyclin-dependent kinases (CDK).
Etymology
Cyclins were originally discovered by R. Timothy Hunt in 1982 while studying the cell cycle of sea urch ...
family, whose members are characterized by a dramatic periodicity in protein abundance through the cell cycle. Cyclins function as regulators of CDK kinases. Different cyclins exhibit distinct expression and degradation patterns which contribute to the temporal coordination of each mitotic event. This cyclin forms a complex with CDK7 kinase and ring finger protein MAT1. The kinase complex is able to phosphorylate CDK2 and CDC2 kinases, thus functions as a CDK-activating kinase (CAK). This cyclin and its kinase partner are components of TFIIH, as well as RNA polymerase II protein complexes. They participate in two different transcriptional regulation processes, suggesting an important link between basal transcription control and the cell cycle machinery.
Interactions
Cyclin H has been shown to
interact
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with
P53
p53, also known as tumor protein p53, cellular tumor antigen p53 (UniProt name), or transformation-related protein 53 (TRP53) is a regulatory transcription factor protein that is often mutated in human cancers. The p53 proteins (originally thou ...
,
Cyclin-dependent kinase 7
Cyclin-dependent kinase 7, or cell division protein kinase 7, is an enzyme that in humans is encoded by the ''CDK7'' gene.
The protein encoded by this gene is a member of the cyclin-dependent protein kinase (CDK) family. CDK family members are ...
and
MNAT1
CDK-activating kinase assembly factor MAT1 is an enzyme that in humans is encoded by the ''MNAT1'' gene.
Function
Cyclin-dependent kinases (CDKs), which play an essential role in cell cycle control of eukaryotic cells, are phosphorylated an ...
.
References
Further reading
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{{PDB Gallery, geneid=902