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Proto-oncogene tyrosine-protein kinase Src

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This article is about the kinase c-Src, for the kinase that phosphorylates c-Src, see CSK.
SRC
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesSRC, ASV, SRC1, c-p60-Src, SRC proto-oncogene, non-receptor tyrosine kinase, THC6
External IDsOMIM: 190090; MGI: 98397; HomoloGene: 21120; GeneCards: SRC; OMA:SRC - orthologs
EC number2.7.10.2
Orthologs
SpeciesHumanMouse
Entrez

6714

20779

Ensembl

ENSG00000197122

ENSMUSG00000027646

UniProt

P12931

P05480

RefSeq (mRNA)

NM_005417
NM_198291

NM_001025395
NM_009271

RefSeq (protein)

NP_005408
NP_938033

NP_001020566
NP_033297

Location (UCSC)Chr 20: 37.34 – 37.41 MbChr 2: 157.42 – 157.47 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Proto-oncogene tyrosine-protein kinase Src, also known as proto-oncogene c-Src, or simply c-Src (cellular Src; pronounced "sarc", as it is short for sarcoma), is a non-receptor tyrosine kinase protein that in humans is encoded by the SRC gene. It belongs to a family of Src family kinases and is similar to the v-Src (viral Src) gene of Rous sarcoma virus. It includes an SH2 domain, an SH3 domain and a tyrosine kinase domain. Two transcript variants encoding the same protein have been found for this gene.[5]

c-Src phosphorylates specific tyrosine residues in other tyrosine kinases. It plays a role in the regulation of embryonic development and cell growth. An elevated level of activity of c-Src is suggested to be linked to cancer progression by promoting other signals.[6] Mutations in c-Src could be involved in the malignant progression of colon cancer. c-Src should not be confused with CSK (C-terminal Src kinase), an enzyme that phosphorylates c-Src at its C-terminus and provides negative regulation of Src's enzymatic activity.

c-Src was originally discovered by American scientists J. Michael Bishop and Harold E. Varmus, for which they were awarded the 1989 Nobel Prize in Physiology or Medicine.[7]

Discovery[edit]

In 1979, J. Michael Bishop and Harold E. Varmus discovered that normal chickens possess a gene that is structurally closely related to v-Src.[8] The normal cellular gene was called c-src (cellular-src).[9] 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.

Structure[edit]

There are 9 members of the Src family kinases: c-Src, Yes, Fyn, Fgr, Yrk, Lyn, Blk, Hck, and Lck.[10] The expression of these Src family members are not the same throughout all tissues and cell types. Src, Fyn and Yes are expressed ubiquitously in all cell types while the others are generally found in hematopoietic cells.[11][12][13][14]

c-Src is made up of 6 functional regions: Src homology 4 domain (SH4 domain), unique region, SH3 domain, SH2 domain, catalytic domain and short regulatory tail.[15] When Src is inactive, the phosphorylated tyrosine group at the 527 position interacts with the SH2 domain which helps the SH3 domain interact with the flexible linker domain and thereby keeps the inactive unit tightly bound. The activation of c-Src causes the dephosphorylation of the tyrosine 527. This induces long-range allostery via protein domain dynamics, causing the structure to be destabilized, resulting in the opening up of the SH3, SH2 and kinase domains and the autophosphorylation of the residue tyrosine 416.[16][17][18]

The autophosphorylation of Y416 as well as phosphorylation of selected Src substrates is enhanced through dimerization of c-Src.[19] The dimerization of c-Src is mediated by the interaction of the myristoylated N-terminal region of one partner and the kinase domain of another partner.[19] Both the N-terminally attached myristic acid and the peptide sequences of the unique region are involved in the interaction.[19] Given the versatility inherent in this intrinsically disordered region, its multisite phosphorylations, and its divergence within the family, the unique domain likely functions as a central signaling hub overseeing much of the enzymatic activities and unique functions of Src family kinases.[19]

c-Src can be activated by many transmembrane proteins that include: adhesion receptors, receptor tyrosine kinases, G-protein coupled receptors and cytokine receptors. Most studies have looked at the receptor tyrosine kinases and examples of these are platelet derived growth factor receptor (PDGFR) pathway and epidermal growth factor receptor (EGFR).

Src contains at least three flexible protein domains, which, in conjunction with myristoylation, can mediate attachment to membranes and determine subcellular localization.[20]

Function[edit]

This proto-oncogene may play a role in the regulation of embryonic development and cell growth.

When src is activated, it promotes survival, angiogenesis, proliferation and invasion pathways. It also regulates angiogenic factors and vascular permeability after focal cerebral ischemia-reperfusion,[21][22] and regulates matrix metalloproteinase-9 activity after intracerebral hemorrhage.[23]

Role in cancer[edit]

The activation of the c-Src pathway has been observed in about 50% of tumors from colon, liver, lung, breast and the pancreas.[24] Since the activation of c-Src leads to the promotion of survival, angiogenesis, proliferation and invasion pathways, the aberrant growth of tumors in cancers is observed. A common mechanism is that there are genetic mutations that result in the increased activity or the overexpression of the c-Src leading to the constant activation of the c-Src.

Colon cancer[edit]

The activity of c-Src has been best characterized in colon cancer. Researchers have shown that Src expression is 5 to 8 fold higher in premalignant polyps than normal mucosa.[25][26][27] The elevated c-Src levels have also been shown to have a correlation with advanced stages of the tumor, size of tumor, and metastatic potential of tumors.[28][29]

Breast cancer[edit]

EGFR activates c-Src while EGF also increases the activity of c-Src. In addition, overexpression of c-Src increases the response of EGFR-mediated processes. So both EGFR and c-Src enhance the effects of one another. Elevated expression levels of c-Src were found in human breast cancer tissues compared to normal tissues.[30][31][32]

Overexpression of Human Epidermal Growth Factor Receptor 2 (HER2), also known as erbB2, is correlated with a worse prognosis for breast cancer.[33][34] Thus, c-Src plays a key role in the tumor progression of breast cancers.

Prostate cancer[edit]

Members of the Src family kinases Src, Lyn and Fgr are highly expressed in malignant prostate cells compared to normal prostate cells.[35] When the primary prostate cells are treated with KRX-123, which is an inhibitor of Lyn, the cells in vitro were reduced in proliferation, migration and invasive potential.[36] So the use of a tyrosine kinase inhibitor is a possible way of reducing the progression of prostate cancers.

As a drug target[edit]

A number of tyrosine kinase inhibitors that target c-Src tyrosine kinase (as well as related tyrosine kinases) have been developed for therapeutic use.[37] One notable example is dasatinib which has been approved for the treatment of chronic myeloid leukemia (CML) and Philadelphia chromosome-positive (PH+) acute lymphocytic leukemia (ALL).[38] Dasatinib is also in clinical trials for the use in non-Hodgkin’s lymphoma, metastatic breast cancer and prostate cancer. Other tyrosine kinase inhibitor drugs that are in clinical trials include bosutinib,[39] bafetinib, Saracatinib(AZD-0530), XLl-999, KX01 and XL228.[6] HSP90 inhibitor NVP-BEP800 has been described to affect stability of Src tyrosine kinase and growth of T-cell and B-cell acute lymphoblastic leukemias. [40]

Interactions[edit]

Src (gene) has been shown to interact with the following signaling pathways:

Survival[edit]

Angiogenesis[edit]

Proliferation[edit]

Motility[edit]

Additional images[edit]

Overview of signal transduction pathways involved in apoptosis.
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Top row:    Beta-strand region

   Hydrogen bonded turn    Helical region

site 2 2 lipid-binding
site 17 17 Phosphoserine
site 35 35 Phosphoserine
site 69 69 Phosphoserine
site 74 74 Phosphothreonine
site 75 75 Phosphoserine; by CDK5
region 87 93 Beta-strand region
region 88 143 SH3
site 88 88 swapped dimer interface [polypeptide binding]
site 93 93 peptide ligand binding site [polypeptide binding]
region 99 102 Beta-strand region
region 110 114 Beta-strand region
region 117 117 Splicing variant
region 118 126 Beta-strand region
region 127 129 Hydrogen bonded turn
region 132 136 Beta-strand region
region 137 139 Helical region
region 140 142 Beta-strand region
region 146 148 Helical region
region 147 247 SH2
region 152 154 Beta-strand region
site 158 158 autoinhibitory site [polypeptide binding]
site 158 158 phosphotyrosine binding pocket [polypeptide binding]
region 158 165 Helical region
region 167 170 Beta-strand region
region 174 179 Beta-strand region
region 176 176 Variant
region 181 183 Beta-strand region
region 187 195 Beta-strand region
site 187 187 Phosphotyrosine (By similarity)
region 196 198 Hydrogen bonded turn
region 199 209 Beta-strand region
site 205 205 hydrophobic binding pocket [polypeptide binding]
region 211 213 Beta-strand region
region 215 218 Beta-strand region
region 221 225 Beta-strand region
region 226 233 Helical region
region 237 237 Variant
region 240 242 Beta-strand region
region 256 259 Beta-strand region
region 267 269 Helical region
region 270 519 Tyrosine kinase
region 270 278 Beta-strand region
site 276 276 Active site (ATP binding)
region 283 289 Beta-strand region
site 290 290 SH3/SH2 domain interface [polypeptide binding]
region 290 292 Hydrogen bonded turn
region 293 299 Beta-strand region
site 298 298 ATP
region 302 304 Hydrogen bonded turn
region 307 319 Helical region
region 328 332 Beta-strand region
region 334 336 Beta-strand region
region 338 341 Beta-strand region
region 349 353 Helical region
region 355 358 Helical region
region 363 382 Helical region
site 389 389 Proton acceptor
region 392 394 Helical region
region 395 397 Beta-strand region
region 399 401 Helical region
region 403 405 Beta-strand region
site 406 406 activation loop (A-loop)
region 410 413 Helical region
region 417 420 Helical region
site 419 419 Phosphotyrosine; by autocatalysis; alternate
site 419 419 Phosphotyrosine; by FAK2; alternate (By similarity)
region 423 426 Hydrogen bonded turn
region 429 431 Helical region
region 434 439 Helical region
site 439 439 Phosphotyrosine
region 444 459 Helical region
region 460 462 Hydrogen bonded turn
region 471 479 Helical region
region 492 501 Helical region
site 501 501 S-nitrosocysteine (By similarity)
region 506 508 Helical region
site 511 511 Phosphothreonine
region 512 520 Helical region
region 521 523 Hydrogen bonded turn
site 522 522 Phosphotyrosine
site 530 530 Phosphotyrosine; by CSK

References[edit]

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External links[edit]

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