ACVR1B
位於12號人類染色體的基因
1B型激活素受體(Activin receptor type-1B),縮寫為ACVR1B或ALK-4,在人體中是一種由ACVR1B基因編碼的蛋白質[5][6]。
ALK-4能夠對激活素或激活素樣配體(即抑制素)的信號進行轉導。激活素首先與ACVR2A或ACVR2B結合,之後再與ALK-4形成複合物。上述過程能夠招募R-SMAD、SMAD2或者SMAD3分子[7]。ALK-4也可以轉導NODAL、GDF-1、Vg1的信號。但是,和激活素不同,這些分子(與ALK-4的結合)需要Cripto蛋白等共受體[8]。
功能
激活素是一類二聚體生長分化因子,屬於TGF-β蛋白質超家族,一類結構上相關的信號蛋白。激活素信號能夠通過一個包含至少兩分子1型以及兩分子2型受體的受體絲氨酸激酶異聚複合體進行轉導。這些受體都屬於跨膜蛋白,包含一個含有豐富半胱氨酸區域的細胞外配體結合結構域,一個跨膜結構域,以及一個推測具有絲氨酸或蘇氨酸專一性的細胞內(即細胞質中的)(激酶)結構域。1型受體對信號轉導來說是必要的,2型受體則對1型受體的表達以及配體的結合來說不可或缺。在配體結合後,1型受體以及2型受體能夠形成一個穩定的複合物,並使1型受體被2型受體磷酸化[6]。
基因結構與表達
編碼ALK-4基因含有11個外含子。可變剪接以及Poly(A)(多聚腺嘌呤)尾巴的變化使該基因擁有多個轉錄本,目前已有3個轉錄本得到闡明,另外,此基因可能存在第四個包含8號外顯子,且8號外顯子與11號外顯子缺乏9號外顯子的轉錄本,但是這種轉錄本對應的mRNA還沒有得到確認[6]。
相互作用
參考
- ^ 1.0 1.1 1.2 GRCh38: Ensembl release 89: ENSG00000135503 - Ensembl, May 2017
- ^ 2.0 2.1 2.2 GRCm38: Ensembl release 89: ENSMUSG00000000532 - Ensembl, May 2017
- ^ Human PubMed Reference:. National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ Mouse PubMed Reference:. National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ ten Dijke P, Ichijo H, Franzén P, Schulz P, Saras J, Toyoshima H, Heldin CH, Miyazono K. Activin receptor-like kinases: a novel subclass of cell-surface receptors with predicted serine/threonine kinase activity. Oncogene. October 1993, 8 (10): 2879–87. PMID 8397373.
- ^ 6.0 6.1 6.2 Entrez Gene: ACVR1B activin A receptor, type IB. (原始內容存檔於2019-09-18).
- ^ Inman GJ, Nicolás FJ, Callahan JF, Harling JD, Gaster LM, Reith AD, Laping NJ, Hill CS. SB-431542 is a potent and specific inhibitor of transforming growth factor-beta superfamily type I activin receptor-like kinase (ALK) receptors ALK4, ALK5, and ALK7. Mol. Pharmacol. 2002, 62 (1): 65–74. PMID 12065756. doi:10.1124/mol.62.1.65.
- ^ Harrison CA, Gray PC, Koerber SC, Fischer W, Vale W. Identification of a functional binding site for activin on the type I receptor ALK4. J. Biol. Chem. 2003, 278 (23): 21129–35. PMID 12665502. doi:10.1074/jbc.M302015200.
- ^ Lebrun JJ, Takabe K, Chen Y, Vale W. Roles of pathway-specific and inhibitory Smads in activin receptor signaling. Mol. Endocrinol. January 1999, 13 (1): 15–23. PMID 9892009. doi:10.1210/mend.13.1.0218.
- ^ Attisano L, Wrana JL, Montalvo E, Massagué J. Activation of signalling by the activin receptor complex. Mol. Cell. Biol. March 1996, 16 (3): 1066–73. PMC 231089 . PMID 8622651.
- ^ De Winter JP, De Vries CJ, Van Achterberg TA, Ameerun RF, Feijen A, Sugino H, De Waele P, Huylebroeck D, Verschueren K, Van Den Eijden-Van Raaij AJ. Truncated activin type II receptors inhibit bioactivity by the formation of heteromeric complexes with activin type I. receptors. Exp. Cell Res. May 1996, 224 (2): 323–34. PMID 8612709. doi:10.1006/excr.1996.0142.
拓展閱讀
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