Adenomatous polyposis coli

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Adenomatous polyposis coli
PBB Protein APC image.jpg
PDB rendering based on 1deb.
Available structures
PDB Ortholog search: PDBe, RCSB
Identifiers
Symbols APC ; BTPS2; DP2; DP2.5; DP3; GS; PPP1R46
External IDs OMIM611731 MGI88039 HomoloGene30950 ChEMBL: 3233 GeneCards: APC Gene
RNA expression pattern
PBB GE APC 216933 x at tn.png
More reference expression data
Orthologs
Species Human Mouse
Entrez 324 11789
Ensembl ENSG00000134982 ENSMUSG00000005871
UniProt P25054 n/a
RefSeq (mRNA) NM_000038 NM_007462
RefSeq (protein) NP_000029 NP_031488
Location (UCSC) Chr 5:
112.04 – 112.18 Mb
Chr 18:
34.22 – 34.32 Mb
PubMed search [1] [2]

This article refers to the tumor suppressor APC, in which mutations lead to colon cancer. For the cell-cycle regulatory complex, APC/C, see Anaphase-promoting complex.

Adenomatous polyposis coli (APC) also known as deleted in polyposis 2.5 (DP2.5) is a protein that in humans is encoded by the APC gene.[1] The APC protein is a negative regulator that controls Beta-catenin concentrations and interacts with E-cadherin, which are involved in cell adhesion. Mutations in the APC gene may result in colorectal cancer.[2]

APC is classified as a tumor suppressor gene. Tumor suppressor genes prevent the uncontrolled growth of cells that may result in cancerous tumors. The protein made by the APC gene plays a critical role in several cellular processes that determine whether a cell may develop into a tumor. The APC protein helps control how often a cell divides, how it attaches to other cells within a tissue, or whether a cell moves within or away from a tissue. This protein also helps ensure that the chromosome number in cells produced through cell division is correct. The APC protein accomplishes these tasks mainly through association with other proteins, especially those that are involved in cell attachment and signaling. The activity of one protein in particular, beta-catenin, is controlled by the APC protein (see: Wnt signaling pathway). Regulation of beta-catenin prevents genes that stimulate cell division from being turned on too often and prevents cell overgrowth.

The human APC gene is located on the long (q) arm of chromosome 5 in band q22.2 The APC gene has been shown to contain an internal ribosome entry site. APC orthologs[3] have also been identified in all mammals for which complete genome data are available.

Structure[edit]

The full-length human protein comprises 2843 amino acids with a (predicted) molecular mass of 311646 Da. Several N-terminal domains have been structurally elucidated in unique atomistic high-resolution complex structures. Most of the protein is predicted to be intrinsically disordered. It is not known if this large predicted unstructured region from amino acid 800 to 2843 persists in vivo or would form stabilised complexes - possibly with yet unidentified interacting proteins.[4] Recently, it has been experimentally confirmed that the mutation cluster region around the center of APC is intrinsically disordered in vitro.[5]

Role in cancer[edit]

The most common mutation in colon cancer is inactivation of APC. When APC does not have an inactivating mutation, frequently there are activating mutations in beta catenin. Mutations in APC can be inherited, or arise sporadically in the somatic cells, often as the result of mutations in other genes that result in the inability to repair mutations in the DNA. In order for cancer to develop, both alleles (copies of the APC gene) must be mutated. Mutations in APC or β-catenin must be followed by other mutations to become cancerous; however, in carriers of an APC inactivating mutations, the risk of colorectal cancer by age 40 is almost 100%.[2]

Familial adenomatous polyposis (FAP) is caused by an inherited, inactivating mutation in the APC gene. More than 800 mutations[citation needed]in the APC gene have been identified in families with classic and attenuated types of familial adenomatous polyposis. Most of these mutations cause the production of an APC protein that is abnormally short and presumably nonfunctional. This short protein cannot suppress the cellular overgrowth that leads to the formation of polyps, which can become cancerous. The most common mutation in familial adenomatous polyposis is a deletion of five bases in the APC gene. This mutation changes the sequence of amino acids in the resulting APC protein beginning at position 1309.

Another mutation is carried by approximately 6 percent of people of Ashkenazi (eastern and central European) Jewish heritage. This mutation results in the substitution of the amino acid lysine for isoleucine at position 1307 in the APC protein (also written as I1307K or Ile1307Lys). This change was initially thought to be harmless, but has recently been shown to be associated with a 10 to 20 percent increased risk of colon cancer.

Regulation of proliferation[edit]

The (Adenomatous Polyposis Coli) APC protein normally builds a complex with glycogen synthase kinase 3-beta( GSK-3β) and axin via interactions with the 20 AA and SAMP repeats[citation needed]. This complex is then able to bind β- catenins in the cytoplasm, that have dissociated from adherens contacts between cells. With the help of casein kinase 1 (CK1), which carries out an initial phosphorylation of β-catenin, GSK-3β is able to phosphorylate β-catenin a second time. This targets β-catenin for ubiquitination and degradation by cellular proteasomes. This prevents it from translocating into the nucleus, where it acts as a transcription factor for proliferation genes. APC is also thought to be targeted to microtubules via the PDZ binding domain, stabilizing them[citation needed]. The deactivation of the APC protein can take place after certain chain reactions in the cytoplasm are started, e.g. through the Wnt signals that destroy the conformation of the complex[citation needed]. In the nucleus it complexes with legless/BCL9, TCF, and Pygo[citation needed].

Mutations[edit]

Mutations in APC often occur early on in cancers such as colon cancer[citation needed]. Patients with familial adenomatous polyposis (FAP) have germline mutations, with 95% being nonsense/frameshift mutations leading to premature stop codons. 33% of mutations occur between amino acids 1061-1309. In somatic mutations, over 60% occur within a mutation cluster region (1286-1513), causing loss of axin binding sites in all but 1 of the 20AA repeats. Mutations in APC lead to loss of β-catenin regulation, altered cell migration and chromosome instability[citation needed].

Neurological role[edit]

Rosenberg et al. found that APC directs cholinergic synapse assembly between neurons, a finding with implications for autonomic neuropathies, for Alzheimer's disease, for age-related hearing loss, and for some forms of epilepsy and schizophrenia[citation needed].

Interactions[edit]

APC (gene) has been shown to interact with:

Overview of signal transduction pathways involved in apoptosis.

See also[edit]

References[edit]

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  3. ^ "OrthoMaM phylogenetic marker: APC coding sequence". 
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  7. ^ Nakamura T, Hamada F, Ishidate T, Anai K, Kawahara K, Toyoshima K, Akiyama T (1998). "Axin, an inhibitor of the Wnt signalling pathway, interacts with beta-catenin, GSK-3beta and APC and reduces the beta-catenin level". Genes Cells 3 (6): 395–403. doi:10.1046/j.1365-2443.1998.00198.x. PMID 9734785. 
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  15. ^ Satoh K, Yanai H, Senda T, Kohu K, Nakamura T, Okumura N, Matsumine A, Kobayashi S, Toyoshima K, Akiyama T (1997). "DAP-1, a novel protein that interacts with the guanylate kinase-like domains of hDLG and PSD-95". Genes Cells 2 (6): 415–24. doi:10.1046/j.1365-2443.1997.1310329.x. PMID 9286858. 
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Further reading[edit]

External links[edit]