P53 geneThe p53 gene is a gene that codes for a protein for tumor suppression. It is very important for cells in multicellular organisms to suppress uncontrolled cell division.
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2 Protein structure
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The human p53 gene is located on chromosome 17.
The p53 protein is a phosphoprotein made of ~390 amino acids. It consists of three units (or domains):
p53 protein has been voted molecule of the year.
The p53 protein can regulate the cell in several ways:
If the p53 gene is damaged, tumor suppression is severely reduced. People who inherit only one functional copy of p53 will most likely develop tumors in early adulthood, a disease known as Li-Fraumeni syndrome. p53 can also be damaged in cells by mutagens (chemicals, radiation or viruses), increasing the likelihood that the cell will begin uncontrolled division. More than 50 percent of human tumors contain a mutation or deletion of the p53 gene.