Cyclin-A1 is a
protein
Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, res ...
that in humans is encoded by the ''CCNA1''
gene
In biology, the word gene (from , ; "...Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity..." meaning ''generation'' or ''birth'' or ''gender'') can have several different meanings. The Mendelian gene is a b ...
.
Function
The protein encoded by this gene belongs to the highly conserved cyclin family, whose members are characterized by a dramatic periodicity in protein abundance through the
cell division cycle. Cyclins function as activating subunits of enzymatic
complex together with
cyclin-dependent kinases (CDKs). Different cyclins exhibit distinct expression and degradation patterns that contribute to the temporal coordination of cell cycle events. Cyclin A1 was shown to be expressed in testis and brain, as well as in several leukemic cell lines, and is thought to primarily function in the control of
meiosis
Meiosis (; , since it is a reductional division) is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells. It involves two rounds of division that ultimately ...
. This cyclin binds both
Cdk1 and
Cdk2 kinases, which give two distinct kinase activities, one appearing in S phase, the other in G2, and thus regulate separate functions in cell cycle. This cyclin was found to bind to important cell cycle regulators, such as Rb family proteins, transcription factor
E2F1
Transcription factor E2F1 is a protein that in humans is encoded by the ''E2F1'' gene.
Function
The protein encoded by this gene is a member of the E2F family of transcription factors. The E2F family plays a crucial role in the control of c ...
, and the Kip/Cip family of CDK-inhibitor proteins.
Interactions
Cyclin-A1
interacts with:
*
CDC20,
*
Cyclin-dependent kinase 2
Cyclin-dependent kinase 2, also known as cell division protein kinase 2, or Cdk2, is an enzyme that in humans is encoded by the ''CDK2'' gene. The protein encoded by this gene is a member of the cyclin-dependent kinase family of Ser/Thr protein ...
,
*
E2F1
Transcription factor E2F1 is a protein that in humans is encoded by the ''E2F1'' gene.
Function
The protein encoded by this gene is a member of the E2F family of transcription factors. The E2F family plays a crucial role in the control of c ...
,
*
GNB2L1,
[
* GPS2,][ and
* Retinoblastoma protein.][
]
References
Further reading
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{{Cell cycle proteins
Cell cycle regulators