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Proto-oncogene tyrosine-protein kinase Src, also known as proto-oncogene c-Src or simply c-Src , is a non-receptor tyrosine kinase protein that in humans is encoded by the SRC gene. This protein phosphorylates specific tyrosine residues in other protein c-Src stands for "cellular Src kinase" and should not be confused with "C-terminal Src kinase" (CSK) which is an enzyme which phosphorylates c-Src at its C-terminus and provides negative regulation of Src's enzymatic activity. c-Src is a widely studied member of non-receptor tyrosine kinases which are not associated with a cell-surface receptor. Src (pronounced "sarc" as it is short for sarcoma) is a proto-oncogene encoding a tyrosine kinase originally discovered by J. Michael Bishop and Harold E. Varmus, for which they were awarded the 1989 Nobel Prize in Physiology or Medicine. It belongs to a family of non-receptor tyrosine kinases called Src family kinases. This gene is similar to the v-Src gene of Rous sarcoma virus. This proto-oncogene may play a role in the regulation of embryonic development and cell growth. The protein encoded by this gene is a tyrosine-protein kinase whose activity can be inhibited by phosphorylation by CSK. Mutations in this gene could be involved in the malignant progression of colon cancer. Two transcript variants encoding the same protein have been found for this gene. == Discovery == In 1979, J. Michael Bishop and Harold E. Varmus discovered that normal chickens contain a gene that is structurally closely related to ''v-Src''. The normal cellular gene was called ''c-src'' (cellular-src). This discovery changed the current thinking about cancer from a model wherein cancer is caused by a foreign substance (a viral gene) to one where a gene that is normally present in the cell can cause cancer. It is believed that at one point an ancestral virus mistakenly incorporated the ''c-Src'' gene of its cellular host. Eventually this normal gene mutated into an abnormally functioning oncogene within the Rous sarcoma virus. Once the oncogene is transfected back into a chicken, it can lead to cancer. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Proto-oncogene tyrosine-protein kinase Src」の詳細全文を読む スポンサード リンク
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