Α-輔肌動蛋白2

位於1號人類染色體的基因

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現的α-輔肌動蛋白異構物,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。

Α-輔肌動蛋白2
已知的結構
PDB直系同源搜尋: 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表現模式




查閱更多表現資料
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]
維基資料
檢視/編輯人類檢視/編輯小鼠

結構

α-輔肌動蛋白2是一種103.8kDa的蛋白質,由894個胺基酸組成。[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處的高解析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盤上的對接傳訊分子中發揮作用,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. 
  2. ^ 2.0 2.1 2.2 GRCh38: Ensembl release 89: ENSG00000077522 - Ensembl, May 2017
  3. ^ 3.0 3.1 3.2 GRCm38: Ensembl release 89: ENSMUSG00000052374 - Ensembl, May 2017
  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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  9. ^ 9.0 9.1 Luther PK. The vertebrate muscle Z-disc: sarcomere anchor for structure and signalling. Journal of Muscle Research and Cell Motility. 2009, 30 (5–6): 171–85. PMC 2799012 . PMID 19830582. doi:10.1007/s10974-009-9189-6. 
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  11. ^ 11.0 11.1 11.2 Eldstrom J, Choi WS, Steele DF, Fedida D. SAP97 increases Kv1.5 currents through an indirect N-terminal mechanism. FEBS Letters. July 2003, 547 (1–3): 205–11. PMID 12860415. doi:10.1016/S0014-5793(03)00668-9 . 
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  13. ^ Morris JA, Kandpal G, Ma L, Austin CP. DISC1 (Disrupted-In-Schizophrenia 1) is a centrosome-associated protein that interacts with MAP1A, MIPT3, ATF4/5 and NUDEL: regulation and loss of interaction with mutation. Human Molecular Genetics. July 2003, 12 (13): 1591–608. PMID 12812986. doi:10.1093/hmg/ddg162 . 
  14. ^ 14.0 14.1 Faulkner G, Pallavicini A, Comelli A, Salamon M, Bortoletto G, Ievolella C, Trevisan S, Kojic' S, Dalla Vecchia F, Laveder P, Valle G, Lanfranchi G. FATZ, a filamin-, actinin-, and telethonin-binding protein of the Z-disc of skeletal muscle. The Journal of Biological Chemistry. December 2000, 275 (52): 41234–42. PMID 10984498. doi:10.1074/jbc.M007493200 . 
  15. ^ 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. 
  16. ^ Galliano MF, Huet C, Frygelius J, Polgren A, Wewer UM, Engvall E. Binding of ADAM12, a marker of skeletal muscle regeneration, to the muscle-specific actin-binding protein, alpha -actinin-2, is required for myoblast fusion. The Journal of Biological Chemistry. May 2000, 275 (18): 13933–9. PMID 10788519. doi:10.1074/jbc.275.18.13933 . 
  17. ^ Chan Y, Tong HQ, Beggs AH, Kunkel LM. Human skeletal muscle-specific alpha-actinin-2 and -3 isoforms form homodimers and heterodimers in vitro and in vivo. Biochemical and Biophysical Research Communications. July 1998, 248 (1): 134–9. PMID 9675099. doi:10.1006/bbrc.1998.8920. 
  18. ^ Bang ML, Mudry RE, McElhinny AS, Trombitás K, Geach AJ, Yamasaki R, Sorimachi H, Granzier H, Gregorio CC, Labeit S. Myopalladin, a novel 145-kilodalton sarcomeric protein with multiple roles in Z-disc and I-band protein assemblies. The Journal of Cell Biology. April 2001, 153 (2): 413–27. PMC 2169455 . PMID 11309420. doi:10.1083/jcb.153.2.413. 
  19. ^ Pomiès P, Macalma T, Beckerle MC. Purification and characterization of an alpha-actinin-binding PDZ-LIM protein that is up-regulated during muscle differentiation. The Journal of Biological Chemistry. October 1999, 274 (41): 29242–50. PMID 10506181. doi:10.1074/jbc.274.41.29242 . 
  20. ^ 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 . 
  21. ^ Salmikangas P, Mykkänen OM, Grönholm M, Heiska L, Kere J, Carpén O. Myotilin, a novel sarcomeric protein with two Ig-like domains, is encoded by a candidate gene for limb-girdle muscular dystrophy. Human Molecular Genetics. July 1999, 8 (7): 1329–36. PMID 10369880. doi:10.1093/hmg/8.7.1329. 
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  23. ^ Chunn CJ, Starr PR, Gilbert DN. Neutrophil toxicity of amphotericin B. Antimicrobial Agents and Chemotherapy. August 1977, 12 (2): 226–30. PMC 429889 . PMID 900919. doi:10.1128/aac.12.2.226. 
  24. ^ Linnemann A, van der Ven PF, Vakeel P, Albinus B, Simonis D, Bendas G, Schenk JA, Micheel B, Kley RA, Fürst DO. The sarcomeric Z-disc component myopodin is a multiadapter protein that interacts with filamin and alpha-actinin. European Journal of Cell Biology. September 2010, 89 (9): 681–92. PMID 20554076. doi:10.1016/j.ejcb.2010.04.004. 
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