突触结合蛋白样蛋白2 (乳腺癌相关抗原SGA-72M) (Exophilin-4)
突触结合蛋白样蛋白2 (乳腺癌相关抗原SGA-72M) (Exophilin-4)
Q9HCH5功能描述
Isoform 1 作为 RAB27A 效应蛋白发挥作用,并在淋巴细胞细胞毒性颗粒胞吐中起作用。它是细胞毒性颗粒在免疫突触处停靠所必需的。Isoform 4 结合磷脂酰丝氨酸 (PS) 和磷脂酰肌醇-4,5-二磷酸 (PIP2),并促进胰腺α细胞中含胰高血糖素颗粒向细胞膜的募集。与 PS 的结合受 Ca(2+) 抑制,而与 PIP2 的结合对 Ca(2+) 不敏感。 {ECO:0000269|PubMed:17182843, ECO:0000269|PubMed:18266782, ECO:0000269|PubMed:18812475}。
组织特异性
Isoform 1 is expressed in hematopoietic lineages with a strong expression in CD4 and CD8 T-lymphocytes. It is also widely expressed in nonhematopoietic tissues. Isoform 5 is expressed only in nonhematopoietic tissues. Isoform 4 is expressed in pancreatic alpha cells.
亚细胞定位
[Isoform 1]: Cytoplasm
关键词