This gene encodes a member of the cancer testis antigen gene family. The encoded protein functions as a scaffold protein that structurally organizes mitogen-activated protein kinases and mediates c-Jun-terminal kinase signaling. This protein also binds to kinesin-1 and may be involved in microtubule-based membrane transport. This protein may play a role in tumor growth and development. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Oct 2011],
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Function:
Function:The JNK-interacting protein (JIP) group of scaffold proteins selectively mediates JNK signaling by aggregating specific components of the MAPK cascade to form a functional JNK signaling module. Isoform 5 may play a role in spermatozoa-egg-interaction.,induction:Isoform 3 is increased in systemic sclerosis fibroblasts.,PTM:Phosphorylated by MAPK8 and MAPK14 (By similarity). Phosphorylated upon DNA damage, probably by ATM or ATR.,similarity:Belongs to the JIP scaffold family.,subcellular location:Associated with the plasma membrane of the acrosomal compartment and also localizes in the acrosome matrix.,subcellular location:Perinuclear distribution in response to stress signals such as UV radiation.,subunit:Homo-oligomer. Interacts with MAX, MAPK8, MAPK9, MAPK10, MAPK14, MAP3K3, MYC, KNS2 and MAP2K4. Interaction with KNS2 is important in the formation of ternary complex with MAPK8. Interacts with NFKB1.,tissue specificity:Isoform 5 is expressed only in testis on the round spermatids of stage I, II and II. Isoform 5 is absent in spermatogonia and spermatocyte. Isoform 3 is expressed in testis. Isoform 4 is expressed in testis and in acute myeloid leukemia (AML) patients.,
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Cellular Localization:
Cytoplasm . Cytoplasm, perinuclear region . Lysosome membrane . Perinuclear distribution in response to stress signals such as UV radiation. .; [Isoform 5]: Cytoplasmic vesicle, secretory vesicle, acrosome . Associated with the plasma membrane of the acrosomal compartment and also localizes in the acrosome matrix. .
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Tissue Expression:
Expressed only in testis on the round spermatids of stage I, II and II. Absent in spermatogonia and spermatocyte. ; [Isoform 4]: Expressed in testis and in acute myeloid leukemia (AML) patients. ; [Isoform 3]: Expressed in testis.