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Cyclin D3
G1/S-specific cyclin-D3 is a protein that in humans is encoded by the ''CCND3'' gene. 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 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 and functions as a regulatory subunit of CDK4 or CDK6, whose activity is required for cell cycle G1/S transition. This protein has been shown to interact with and be involved in the phosphorylation of tumor suppressor protein Rb. The CDK4 activity associated with this cyclin was reported to be necessary for cell cycle progression through G2 phase into mitosis after UV radiation. Clinical significance Mutations in ''CCND3'' are implicated in cases of breast cancer. Interactions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 metabolic reactions, DNA replication, Cell signaling, responding to stimuli, providing Cytoskeleton, structure to cells and Fibrous protein, organisms, and Intracellular transport, transporting molecules from one location to another. Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the Nucleic acid sequence, nucleotide sequence of their genes, and which usually results in protein folding into a specific Protein structure, 3D structure that determines its activity. A linear chain of amino acid residues is called a polypeptide. A protein contains at least one long polypeptide. Short polypeptides, containing less than 20–30 residues, are rarely considered to be proteins and are commonly called pep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AKAP8
A-kinase anchor protein 8 is an enzyme that, in humans, is encoded by the ''AKAP8'' gene. Function The A-kinase anchor proteins (AKAPs) are a group of structurally diverse proteins, which have the common function of binding to the regulatory subunit of protein kinase A (PKA) and confining it to discrete locations within the cell. This gene encodes a member of the AKAP family. The encoded protein is located in the nucleus during interphase and is redistributed to distinct locations during mitosis. This protein has a cell cycle-dependent interaction with the RII subunit of PKA. Interactions AKAP8 has been demonstrated to interact with: * Cyclin D3 * DDX5, * MCM2, * MYCBP, and * PRKAR2A cAMP-dependent protein kinase type II-alpha regulatory subunit is an enzyme that in humans is encoded by the ''PRKAR2A'' gene. Function cAMP is a signaling molecule important for a variety of cellular functions. cAMP exerts its effects by act .... References Further reading * * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 urchins. In an interview hosted by Jim Al-Khalili and R. Timothy Hunt for "The Life Scientific", which aired on December 13, 2011, explained that the name "cyclin" was originally named after his hobby cycling. It was only after the naming did its importance in the cell cycle become apparent. As it was appropriate, the name stuck. R. Timothy Hunt: "By the way, the name cyclin, which I coined, was really a joke, it's because I liked cycling so much at the time, but they did come and go in the cell..." Function Cyclins were originally named because their concentration varies in a cyclical fashion during the cell cycle. (Note that the cyclins are now classified according to their conserved cyclin box structure, and not all these cyclins alt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Retinoic Acid Receptor Alpha
Retinoic acid receptor alpha (RAR-α), also known as NR1B1 (nuclear receptor subfamily 1, group B, member 1), is a nuclear receptor that in humans is encoded by the ''RARA'' gene. ''NR1B1'' is a gene with a protein product and has a chromosomal location of 17q21.2. ''RARA'' codes for the nuclear hormone receptor retinoic acid receptor, alpha subtype, a transcription factor. There are another two subtypes of RARs: beta and gamma subtypes. Function Retinoid signaling is transduced by two families of nuclear receptors, retinoic acid receptor ( RAR) and retinoid X receptor ( RXR), which form RXR/RAR heterodimers. In the absence of ligand, DNA-bound RXR/RARA represses transcription by recruiting the corepressors NCOR1, SMRT ( NCOR2), and histone deacetylase. When ligand binds to the complex, it induces a conformational change allowing the recruitment of coactivators, histone acetyltransferases, and the basic transcription machinery. Retinoic acid receptor-alpha, the protein, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EIF3K
Eukaryotic translation initiation factor 3 subunit K (eIF3k) is a protein that in humans is encoded by the ''EIF3K'' gene. Function The ~800 kDa eukaryotic initiation factor 3 Eukaryotic initiation factor 3 (eIF3) is a multiprotein complex that functions during the initiation phase of eukaryotic translation. It is essential for most forms of cap-dependent and cap-independent translation initiation. In humans, eIF3 co ... (eIF3) is the largest eIF and contains at least 12 subunits, including eIF3k/EIF2S12. eIF3 plays an essential role in translation by binding directly to the 40S ribosomal subunit and promoting formation of the 43S preinitiation complex. Interactions eIF3k has been shown to interact with Cyclin D3 and eIF3a. See also * Eukaryotic initiation factor 3 (eIF3) References Further reading * * * * External links * {{gene-19-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyclin-dependent Kinase 6
Cell division protein kinase 6 (CDK6) is an enzyme encoded by the ''CDK6'' gene. It is regulated by cyclins, more specifically by Cyclin D proteins and Cyclin-dependent kinase inhibitor proteins. The protein encoded by this gene is a member of the cyclin-dependent kinase, (CDK) family, which includes CDK4. CDK family members are highly similar to the gene products of ''Saccharomyces cerevisiae'' cdc28, and ''Schizosaccharomyces pombe'' cdc2, and are known to be important regulators of cell cycle progression in the point of regulation named R or restriction point. This kinase is a catalytic subunit of the protein kinase complex, important for the G1 phase progression and G1/S transition of the cell cycle and the complex is composed also by an activating sub-unit; the cyclin D. The activity of this kinase first appears in mid-G1 phase, which is controlled by the regulatory subunits including D-type cyclins and members of INK4 family of CDK inhibitors. This kinase, as well as CDK4, h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyclin-dependent Kinase 4
Cyclin-dependent kinase 4 (CDK4), also known as cell division protein kinase 4, is an enzyme that is encoded by the ''CDK4'' gene in humans. CDK4 is a member of the cyclin-dependent kinase family, a group of serine/threonine kinases which regulate the cell cycle. CDK4 regulates the G1/S transition by contributing to the phosphorylation of retinoblastoma (RB) protein, which leads to the release of protein factors like E2F1 that promote S-phase progression. It is regulated by cyclins like cyclin D proteins, regulatory kinases, and cyclin kinase inhibitors (CKIs). Dysregulation of the CDK4 pathway is common in many cancers, and CDK4 is a new therapeutic target in cancer treatment. Structure The CDK4 gene is located on chromosome 12 in humans. The gene is composed of 4,583 base pairs which together code for the 303 amino acid protein with a molecular mass of 33,730 Da. All CDK proteins, including CDK4, have two lobes: the smaller N-terminal lobe (which contains an inhibitory G-l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CRABP2
Cellular retinoic acid-binding protein 2 is a cytoplasmic binding protein that in humans is encoded by the ''CRABP2'' gene. CRABP2 is structurally similar to CRABP1, but CRABP2 has a lower affinity for retinoic acid (RA). CRABP2 is associated with cells that produce large amounts of retinoic acid and may play a role in mediating the effects of retinoic acid in the cell. Function A number of specific carrier proteins for members of the vitamin A family have been discovered. Retinoic acid is an active metabolite of vitamin A (retinol). Cellular retinoic acid binding proteins (CRABP) are low molecular weight proteins whose precise function remains largely unknown. The inducibility of the CRABP2 gene suggests that this isoform is important in retinoic acid-mediated regulation of human skin growth, differentiation and development. CRABP2 is involved in the metabolism and transportation of retinoic acid from the cytosol to the RARs (retinoic acid receptors) located in the nucleus. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CDKN1B
Cyclin-dependent kinase inhibitor 1B (p27Kip1) is an enzyme inhibitor that in humans is encoded by the CDKN1B gene. It encodes a protein which belongs to the CIP/KIP, ''Cip/Kip'' family of cyclin dependent kinase (Cdk) inhibitor proteins. The encoded protein binds to and prevents the activation of cyclin E-Cyclin-dependent kinase 2, CDK2 or cyclin D-Cyclin-dependent kinase 4, CDK4 complexes, and thus controls the cell cycle progression at G1. It is often referred to as a cell cycle inhibitor protein because its major function is to stop or slow down the cell division cycle. Function The p27Kip1 gene has a DNA sequence similar to other members of the "Cip/Kip" family which include the p21Cip1/Waf1 and p57 (gene), p57Kip2 genes. In addition to this structural similarity the "Cip/Kip" proteins share the functional characteristic of being able to bind several different classes of Cyclin and Cdk molecules. For example, p27Kip1 binds to cyclin D either alone, or when complexed to it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CDC2L1
PITSLRE serine/threonine-protein kinase CDC2L1 is an enzyme that in humans is encoded by the ''CDK11B'' gene. This gene encodes a member of the p34Cdc2 protein kinase family. p34Cdc2 kinase family members are known to be essential for eukaryotic cell cycle control. This gene is in close proximity to CDC2L2, a nearly identical gene in the same chromosomal region. The gene loci including this gene, CDC2L2, as well as metalloprotease MMP21/22, consist of two identical, tandemly linked genomic regions which are thought to be a part of the larger region that has been duplicated. This gene and CDC2L2 were shown to be deleted or altered frequently in neuroblastoma with amplified MYCN genes. The protein kinase encoded by this gene could be cleaved by caspases and was demonstrated to play roles in cell apoptosis. Several alternatively spliced variants of this gene have been reported. Interactions CDC2L1 has been shown to interact with Cyclin D3 G1/S-specific cyclin-D3 is a protein th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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: protein-coding genes and non-coding genes. During gene expression (the synthesis of Gene product, RNA or protein from a gene), DNA is first transcription (biology), copied into RNA. RNA can be non-coding RNA, directly functional or be the intermediate protein biosynthesis, template for the synthesis of a protein. The transmission of genes to an organism's offspring, is the basis of the inheritance of phenotypic traits from one generation to the next. These genes make up different DNA sequences, together called a genotype, that is specific to every given individual, within the gene pool of the population (biology), population of a given species. The genotype, along with environmental and developmental factors, ultimately determines the phenotype ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
