Α-輔肌動蛋白2
α-輔肌動蛋白2(英語:Alpha-actinin-2)是一種蛋白質,在人類中由ACTN2基因編碼。[6]該基因編碼一種在骨骼肌和心肌中表達的α-輔肌動蛋白異構體,其功能是將肌原纖維肌動蛋白細絲和肌聯蛋白錨定到Z盤上。
結構
[編輯]α-輔肌動蛋白2是一種103.8kDa的蛋白質,由894個氨基酸組成。[7][8]每個分子都是棒狀的(長度為35nm),並且以反平行的方式同源二聚化。每個單體都有一個N端肌動蛋白結合區,由兩個鈣調理蛋白同源結構域、兩個C端EF手結構域和四個串聯血影蛋白樣重複序列組成,形成分子中心區域的杆狀結構域。[9] 人類α-輔肌動蛋白2在3.5Å處的高解像度晶體結構最近得到解決。[10]α輔肌動蛋白屬於血影蛋白基因超家族,它代表一組不同的肌動蛋白結合細胞骨架蛋白,包括血影蛋白、抗肌萎縮蛋白、肌營養相關蛋白和絲束蛋白。[9]骨骼肌、心臟和平滑肌亞型定位於Z盤和類似的緻密體,它們有助於錨定肌原纖維肌動蛋白絲。α-肌動蛋白2已被證明與KCNA5、[11][12]DLG1、[11]DISC1、[13]MYOZ1、[14]GRIN2B、[15]ADAM12、[16]ACTN3、[17]MYPN、[18]PDLIM3、[19]PKN、[20]MYOT、[21]TTN、[22]NMDAR、[23]SYNPO2、[24]LDB3、[25]和MYOZ1[14]產生相互作用。
功能
[編輯]α-輔肌動蛋白2的主要功能是在Z盤上交聯絲狀肌動蛋白分子和來自相鄰肌小節的肌聯蛋白分子,該功能受磷脂調節。[26][27]從漢普頓等人的研究中可以清楚地看出,這種交聯可以呈現多種構象,偏好60°和120°的角度。[28]α-輔肌動蛋白2還在Z盤上的對接信號分子中發揮作用,另外的研究還表明α-輔肌動蛋白2與心臟離子通道的結合有關,尤其是Kv1.5。[11]
臨床意義
[編輯]ACTN2的突變與肥厚型心肌病、[29]擴張型心肌病和心內膜彈力纖維增生症有關。[30]α-輔肌動蛋白2的不同功能反映在攜帶ACTN2突變的患者的不同臨床表現中。[31]
參考資料
[編輯]- ^ 與Α-辅肌动蛋白2相關的疾病;在維基數據上查看/編輯參考.
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延申閱讀
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- Wyszynski M, Lin J, Rao A, Nigh E, Beggs AH, Craig AM, Sheng M. Competitive binding of alpha-actinin and calmodulin to the NMDA receptor. Nature. January 1997, 385 (6615): 439–42. PMID 9009191. S2CID 4266742. doi:10.1038/385439a0.
- Mukai H, Toshimori M, Shibata H, Takanaga H, Kitagawa M, Miyahara M, Shimakawa M, Ono Y. Interaction of PKN with alpha-actinin. The Journal of Biological Chemistry. February 1997, 272 (8): 4740–6. PMID 9030526. doi:10.1074/jbc.272.8.4740 .
- Young P, Ferguson C, Bañuelos S, Gautel M. Molecular structure of the sarcomeric Z-disk: two types of titin interactions lead to an asymmetrical sorting of alpha-actinin. The EMBO Journal. March 1998, 17 (6): 1614–24. PMC 1170509 . PMID 9501083. doi:10.1093/emboj/17.6.1614.
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- Maruoka ND, Steele DF, Au BP, Dan P, Zhang X, Moore ED, Fedida D. alpha-actinin-2 couples to cardiac Kv1.5 channels, regulating current density and channel localization in HEK cells. FEBS Letters. May 2000, 473 (2): 188–94. PMID 10812072. doi:10.1016/S0014-5793(00)01521-0 .
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外部連結
[編輯]- Mass spectrometry characterization of human ACTN2 at COPaKB
- GeneReviews/NIH/NCBI/UW entry on Familial Hypertrophic Cardiomyopathy Overview (頁面存檔備份,存於互聯網檔案館)
- Human ACTN2 genome location and ACTN2 gene details page in the UCSC Genome Browser.