Recombinant Human EF-hand calcium-binding domain-containing protein 4B (EFCAB4B)

Uniprot Id

Q9BSW2

Target Species

Human

Target Name

CRACR2A

Target Full Name

EF-hand calcium-binding domain-containing protein 4B

Target Function

Ca(2+)-binding protein that plays a key role in store-operated Ca(2+) entry (SOCE) in T-cells by regulating CRAC channel activation. Acts as a cytoplasmic calcium-sensor that facilitates the clustering of ORAI1 and STIM1 at the junctional regions between the plasma membrane and the endoplasmic reticulum upon low Ca(2+) concentration. It thereby regulates CRAC channel activation, including translocation and clustering of ORAI1 and STIM1. Upon increase of cytoplasmic Ca(2+) resulting from opening of CRAC channels, dissociates from ORAI1 and STIM1, thereby destabilizing the ORAI1-STIM1 complex.; Rab GTPase that mediates the trafficking of Weibel-Palade bodies (WPBs) to microtubule organizing center (MTOC) in endothelial cells in response to acute inflammatory stimuli. During histamine (but not thrombin) stimulation of endothelial cells, the dynein-bound form induces retrograde transport of a subset of WPBs along microtubules to the MTOC in a Ca(2+)-independent manner and its GTPase activity is essential for this function. Ca(2+)-regulated dynein adapter protein that activates dynein-mediated transport and dynein-dynactin motility on microtubules and regulates endosomal trafficking of CD47. Acts as an intracellular signaling module bridging two important T-cell receptor (TCR) signaling pathways, Ca(2+)-NFAT and JNK, to affect T-cell activation. In resting T-cells, is predominantly localized near TGN network in a GTP-bound form, upon TCR stimulation, localizes at the immunological synapse via interaction with VAV1 to activate downstream Ca(2+)-NFAT and JNK signaling pathways. Plays a role in T-helper 1 (Th1) cell differentiation and T-helper 17 (Th17) cell effector function. Plays a role in store-operated Ca(2+) entry (SOCE) in T-cells by regulating CRAC channel activation.

Target Subcellular Location

[Isoform 1]: Cytoplasm.; [Isoform 2]: Cytoplasm. Cytoplasm, cytoskeleton, microtubule organizing center. Cell membrane. Golgi apparatus membrane. Golgi apparatus, trans-Golgi network membrane. Vesicle.

Target Protein Families

EFCAB4 family

Target Tissue Specificity

[Isoform 1]: Expressed in the Jurkat T-cell line.; [Isoform 2]: Expressed in endothelial cells. Expressed in Weibel-Palade bodies (which are P-selectin/SELP negative) in endothelial cells. Expressed in the Jurkat T-cell line.

Target Synonyms

CRACR2A; EFCAB4B; EF-hand calcium-binding domain-containing protein 4B; Calcium release-activated calcium channel regulator 2A; CRAC channel regulator 2A; Calcium release-activated channel regulator 2A

Target Background

Enables GTPase activity and calcium ion binding activity. Involved in several processes, including activation of store-operated calcium channel activity; positive regulation of JNK cascade; and store-operated calcium entry. Located in several cellular components, including Golgi apparatus; Weibel-Palade body; and immunological synapse.