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Α-輔肌動蛋白2

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Α-輔肌動蛋白2
已知的結構
PDB直系同源搜索: PDBe RCSB
識別號
別名ACTN2;, CMD1AA, CMH23, actinin alpha 2, MYOCOZ, MPD6
外部IDOMIM102573 MGI109192 HomoloGene31016 GeneCardsACTN2
相關疾病
牙周炎、​dilated cardiomyopathy 1AA[1]
基因位置(人類
1號染色體
染色體1號染色體[2]
1號染色體
Α-輔肌動蛋白2的基因位置
Α-輔肌動蛋白2的基因位置
基因座1q43起始236,664,141 bp[2]
終止236,764,631 bp[2]
RNA表達模式




查閱更多表達數據
直系同源
物種人類小鼠
Entrez
Ensembl
UniProt
mRNA​序列

NM_001103
​NM_001278343
​NM_001278344

NM_033268

蛋白序列

NP_001094
​NP_001265272
​NP_001265273

NP_150371

基因位置​(UCSC)Chr 1: 236.66 – 236.76 MbChr 13: 12.28 – 12.36 Mb
PubMed​查找[4][5]
維基數據
檢視/編輯人類檢視/編輯小鼠

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

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處的高分辨率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]MYOZ1[14]產生相互作用。

功能

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

ACTN2的突變與肥厚型心肌病[29]擴張型心肌病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

  1. ^ 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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  4. ^ Human PubMed Reference:. National Center for Biotechnology Information, U.S. National Library of Medicine. 
  5. ^ Mouse PubMed Reference:. National Center for Biotechnology Information, U.S. National Library of Medicine. 
  6. ^ Entrez Gene: ACTN2 actinin, alpha 2. [2023-03-10]. (原始內容存檔於2010-03-05). 
  7. ^ Protein Information – Basic Information: Protein COPaKB ID: P35609. Cardiac Organellar Protein Atlas Knowledgebase. [2015-04-13]. (原始內容存檔於2015-04-13). 
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