TARGETID

T12499

FORMERID

TTDS00407

UNIPROID

LCK_HUMAN

TARGNAME

LCK tyrosine protein kinase (LCK)

GENENAME

LCK

TARGTYPE

Successful target

SYNONYMS

p56-LCK; Tyrosine-protein kinase Lck; T cell-specific protein-tyrosine kinase; Proto-oncogene tyrosine-protein kinase LCK; Proto-oncogene Lck; Protein YT16; Lymphocyte cell-specific protein-tyrosine kinase; Leukocyte C-terminal Src kinase; LSK; LCK p59-Fyn; LCK Protooncogene Syn

FUNCTION

Plays a key role in T-cell antigen receptor (TCR)-linked signal transduction pathways. Constitutively associated with the cytoplasmic portions of the CD4 and CD8 surface receptors. Association of the TCR with a peptide antigen-bound MHC complex facilitates the interaction of CD4 and CD8 with MHC class II and class I molecules, respectively, thereby recruiting the associated LCK protein to the vicinity of the TCR/CD3 complex. LCK then phosphorylates tyrosine residues within the immunoreceptor tyrosine-based activation motifs (ITAM) of the cytoplasmic tails of the TCR-gamma chains and CD3 subunits, initiating the TCR/CD3 signaling pathway. Once stimulated, the TCR recruits the tyrosine kinase ZAP70, that becomes phosphorylated and activated by LCK. Following this, a large number of signaling molecules are recruited, ultimately leading to lymphokine production. LCK also contributes to signaling by other receptor molecules. Associates directly with the cytoplasmic tail of CD2, which leads to hyperphosphorylation and activation of LCK. Also plays a role in the IL2 receptor-linked signaling pathway that controls the T-cell proliferative response. Binding of IL2 to its receptor results in increased activity of LCK. Is expressed at all stages of thymocyte development and is required for the regulation of maturation events that are governed by both pre-TCR and mature alpha beta TCR. Phosphorylates other substrates including RUNX3, PTK2B/PYK2, the microtubule-associated protein MAPT, RHOH or TYROBP. Interacts with FYB2. Non-receptor tyrosine-protein kinase that plays an essential role in the selection and maturation of developing T-cells in the thymus and in the function of mature T-cells.

PDBSTRUC

6H6A; 5MTN; 5MTM; 4D8K; 4C3F

BIOCLASS

Kinase

ECNUMBER

EC 2.7.10.2

SEQUENCE

MGCGCSSHPEDDWMENIDVCENCHYPIVPLDGKGTLLIRNGSEVRDPLVTYEGSNPPASPLQDNLVIALHSYEPSHDGDLGFEKGEQLRILEQSGEWWKAQSLTTGQEGFIPFNFVAKANSLEPEPWFFKNLSRKDAERQLLAPGNTHGSFLIRESESTAGSFSLSVRDFDQNQGEVVKHYKIRNLDNGGFYISPRITFPGLHELVRHYTNASDGLCTRLSRPCQTQKPQKPWWEDEWEVPRETLKLVERLGAGQFGEVWMGYYNGHTKVAVKSLKQGSMSPDAFLAEANLMKQLQHQRLVRLYAVVTQEPIYIITEYMENGSLVDFLKTPSGIKLTINKLLDMAAQIAEGMAFIEERNYIHRDLRAANILVSDTLSCKIADFGLARLIEDNEYTAREGAKFPIKWTAPEAINYGTFTIKSDVWSFGILLTEIVTHGRIPYPGMTNPEVIQNLERGYRMVRPDNCPEELYQLMRLCWKERPEDRPTFDYLRSVLEDFFTATEGQYQPQP

DRUGINFO

Dasatinib

DRUGINFO

VX-680

DRUGINFO

ISIS-CRP

DRUGINFO

JNJ-26483327

DRUGINFO

(4-Phenoxy-phenyl)-quinazolin-4-yl-amine

DRUGINFO

2-(3,4,5-Trihydroxy-benzylidene)-malononitrile

DRUGINFO

3-(4-(o-toluidino)pyrimidin-2-ylamino)benzamide

DRUGINFO

4-(3-Chloro-phenoxy)-6,7-dimethoxy-quinazoline