CTCF

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維基百科,自由的百科全書
CCCTC-結合因子(鋅指蛋白)
PDB rendering based on 1x6h.
有效結構
PDB 直系同源檢索:PDBe, RCSB
標識
代號 CTCF
擴展標識 遺傳學604167 鼠基因109447 同源基因4786 GeneCards: CTCF Gene
RNA表達模式
更多表達數據
直系同源體
物種 人類 小鼠
Entrez 10664 13018
Ensembl ENSG00000102974 ENSMUSG00000005698
UniProt P49711 Q61164
mRNA序列 NM_001191022 NM_181322
蛋白序列 NP_001177951 NP_851839
基因位置 Chr 16:
67.6 – 67.67 Mb
Chr 8:
105.64 – 105.68 Mb
PubMed查詢 [1] [2]

轉錄阻抑物CTCF,也被稱為11鋅指蛋白或CCCTC結合因子,是由人類CTCF基因編碼的轉錄因子[1][2]。CTCF參與多個細胞進程,包括轉錄調控、絕緣子活性調控、V(D)J重組、染色質結構調控等[3][4]

發現[編輯]

CTCF最早被認為在雞體內抑制c-myc基因表達。CTCF蛋白和以CCCTC為核心序列的三個規則間隔重複蛋白相結合,故得名CCCTC結合因子[5]

功能[編輯]

CTCF的主要功能是調控染色質的3D結構[4]。CTCF和DNA雙鏈結合形成染色質環,並把DNA錨定在細胞結構上(例如核纖層)[6]。此外,CTCF還能充當常染色質和異染色質的邊界。

DNA的3D結構會影響基因的調控,因此CTCF的活性會影響基因表達。絕緣子能阻礙增強子和啟動子的結合,而CTCF是絕緣子的主要活性部分[5]

已觀測到的活性[編輯]

CTCF的結合有多種效應。目前尚不能確定下列功能是直接由CTCF導致。

轉錄調控[編輯]

CTCF對於IGF2的抑制起重要作用。具體機制為CTCF和H19基因的基因銘印(ICR)區域、差異甲基化區域-1(DMR-1)和MAR3區域結合[7]

絕緣子[編輯]

CTCF能通過和目標區域結合以阻礙增強子和啟動子的相互作用,從而降低增強子對某些功能域的調控能力[8]。除此之外,CTCF還能作為染色質「路障」,阻止異染色質的進一步形成。

染色質結構調控[編輯]

CTCF往往以二聚體的形式存在,這會導致DNA形成環狀結構。CTCF也經常在DNA和核纖層的結合處出現。使用ChIP-seq技術可以發現CTCF同黏連蛋白一起在基因組內廣泛存在,並對染色質的高級結構起調節作用[9][10][11]

RNA剪切調控[編輯]

CTCF對mRNA剪切有調控作用[12]

與DNA結合[編輯]

CTCF和共有序列CCGCGNGGNGGCAG相結合。這條序列在其結構域中有11個鋅指結構。CTCF和基因的結合被CpG的甲基化所影響[13][14]

CTCF在19個細胞系中大約有55000個共同的DNA結合位點(共77811個獨特位點)。CTCF能和不同的鋅指結構結合,這讓它的功能非常多樣化。大約有30000個CTCF的位點功能已經被定義。在人類的不同細胞中大約有15000-40000個CTCF結合位點。除此之外,高分辨率的核小體比對現實CTCF的不同結合位點可能和核小體的定位有關[15][16][17][18]

蛋白互作[編輯]

CTCF可能和Y box結合蛋白1有相互作用[19]。黏連蛋白對CTCF形成的環狀結構有穩定作用[20]

參考[編輯]

  1. ^ Malik, V. S.; Reusser, F. Restriction enzyme map for streptomycete plasmid pUC3. Plasmid. 1979-10, 2 (4): 627–631 [2018-10-01]. ISSN 0147-619X. PMID 231272. (原始內容存檔於2018-10-02). 
  2. ^ Zuccato, E.; Mussini, E.; Spignoli, G.; Pupita, F. Evidence of a lack of enteric side-effects induced by DEAE-dextran in man. Pharmacological Research Communications. 1987-8, 19 (8): 547–553 [2018-10-01]. ISSN 0031-6989. PMID 2448833. (原始內容存檔於2018-10-02). 
  3. ^ Ishikawa, H. [Effect of anesthetized antral mucosa on anti-peristaltic discharge]. Nihon Heikatsukin Gakkai Zasshi. 1987-4, 23 (2): 115–124 [2018-10-01]. ISSN 0374-3527. PMID 3444155. (原始內容存檔於2018-10-02). 
  4. ^ 4.0 4.1 Dahlgren, C. Difference in extracellular radical release after chemotactic factor and calcium ionophore activation of the oxygen radical-generating system in human neutrophils. Biochimica Et Biophysica Acta. 1987-08-19, 930 (1): 33–38 [2018-10-01]. ISSN 0006-3002. PMID 3040116. (原始內容存檔於2018-10-02). 
  5. ^ 5.0 5.1 Lobanenkov, V. V.; Nicolas, R. H.; Adler, V. V.; Paterson, H.; Klenova, E. M.; Polotskaja, A. V.; Goodwin, G. H. A novel sequence-specific DNA binding protein which interacts with three regularly spaced direct repeats of the CCCTC-motif in the 5'-flanking sequence of the chicken c-myc gene. Oncogene. 1990-12, 5 (12): 1743–1753 [2018-10-01]. ISSN 0950-9232. PMID 2284094. (原始內容存檔於2018-10-02). 
  6. ^ Guelen, Lars; Pagie, Ludo; Brasset, Emilie; Meuleman, Wouter; Faza, Marius B.; Talhout, Wendy; Eussen, Bert H.; de Klein, Annelies; Wessels, Lodewyk. Domain organization of human chromosomes revealed by mapping of nuclear lamina interactions. Nature. 2008-06-12, 453 (7197): 948–951 [2018-10-01]. ISSN 1476-4687. PMID 18463634. doi:10.1038/nature06947. (原始內容存檔於2018-10-02). 
  7. ^ Dunn, Katherine L.; Davie, James R. The many roles of the transcriptional regulator CTCF. Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire. 2003-6, 81 (3): 161–167 [2018-10-01]. ISSN 0829-8211. PMID 12897849. doi:10.1139/o03-052. (原始內容存檔於2018-10-02). 
  8. ^ Malyshev, Iu I.; Iarygin, A. S.; Malyshev, M. Iu. [Surgical correction of multivalvular defects in patients who had earlier undergone heart surgery]. Grudnaia Khirurgiia (Moscow, Russia). 1989-11, (6): 17–20 [2018-10-01]. ISSN 0017-4866. PMID 2612964. (原始內容存檔於2018-10-02). 
  9. ^ Yusufzai, Timur M.; Tagami, Hideaki; Nakatani, Yoshihiro; Felsenfeld, Gary. CTCF tethers an insulator to subnuclear sites, suggesting shared insulator mechanisms across species. Molecular Cell. 2004-01-30, 13 (2): 291–298 [2018-10-01]. ISSN 1097-2765. PMID 14759373. (原始內容存檔於2018-10-02). 
  10. ^ Hou, Chunhui; Zhao, Hui; Tanimoto, Keiji; Dean, Ann. CTCF-dependent enhancer-blocking by alternative chromatin loop formation. Proceedings of the National Academy of Sciences of the United States of America. 2008-12-23, 105 (51): 20398–20403 [2018-10-01]. ISSN 1091-6490. PMC 2629272可免費查閱. PMID 19074263. doi:10.1073/pnas.0808506106. (原始內容存檔於2018-10-02). 
  11. ^ Johnson, E. K.; Kardong, K. V.; Mackessy, S. P. Electric shocks are ineffective in treatment of lethal effects of rattlesnake envenomation in mice. Toxicon: Official Journal of the International Society on Toxinology. 1987, 25 (12): 1347–1349 [2018-10-01]. ISSN 0041-0101. PMID 3438923. (原始內容存檔於2018-10-02). 
  12. ^ Shukla, Sanjeev; Kavak, Ersen; Gregory, Melissa; Imashimizu, Masahiko; Shutinoski, Bojan; Kashlev, Mikhail; Oberdoerffer, Philipp; Sandberg, Rickard; Oberdoerffer, Shalini. CTCF-promoted RNA polymerase II pausing links DNA methylation to splicing. Nature. 2011-11-03, 479 (7371): 74–79 [2018-10-01]. ISSN 1476-4687. PMID 21964334. doi:10.1038/nature10442. (原始內容存檔於2018-10-02). 
  13. ^ Kroeker, L. [Nursing--a new future]. Krankenpflege (Frankfurt Am Main, Germany). 1989-9, 43 (9): 426–429 [2018-10-01]. ISSN 0944-9183. PMID 2572726. (原始內容存檔於2018-10-02). 
  14. ^ Bell, A. C.; Felsenfeld, G. Methylation of a CTCF-dependent boundary controls imprinted expression of the Igf2 gene. Nature. 2000-05-25, 405 (6785): 482–485 [2018-10-01]. ISSN 0028-0836. PMID 10839546. doi:10.1038/35013100. (原始內容存檔於2018-10-02). 
  15. ^ Gomoliako, I. V. [Morphological diagnosis of chronic bronchitis in patients with tuberculosis of the lungs]. Problemy Tuberkuleza. 1991, (4): 64–68 [2018-10-01]. ISSN 0032-9533. PMID 1852749. (原始內容存檔於2018-10-02). 
  16. ^ Reiher, H.; Peschke, G.; May, G.; Göbel, U.; Randow, H. [Severe impalement injury with primary surgical, gynecologic and urologic management]. Zentralblatt Fur Chirurgie. 1990, 115 (16): 1041–1043 [2018-10-01]. ISSN 0044-409X. PMID 2238977. (原始內容存檔於2018-10-02). 
  17. ^ Suzuki, S. S.; Smith, G. K. Spontaneous EEG spikes in the normal hippocampus. II. Relations to synchronous burst discharges. Electroencephalography and Clinical Neurophysiology. 1988-6, 69 (6): 532–540 [2018-10-01]. ISSN 0013-4694. PMID 2453330. (原始內容存檔於2018-10-02). 
  18. ^ Teif, Vladimir B.; Vainshtein, Yevhen; Caudron-Herger, Maïwen; Mallm, Jan-Philipp; Marth, Caroline; Höfer, Thomas; Rippe, Karsten. Genome-wide nucleosome positioning during embryonic stem cell development. Nature Structural & Molecular Biology. 2012-11, 19 (11): 1185–1192 [2018-10-01]. ISSN 1545-9985. PMID 23085715. doi:10.1038/nsmb.2419. (原始內容存檔於2018-10-02). 
  19. ^ Chernukhin, I. V.; Shamsuddin, S.; Robinson, A. F.; Carne, A. F.; Paul, A.; El-Kady, A. I.; Lobanenkov, V. V.; Klenova, E. M. Physical and functional interaction between two pluripotent proteins, the Y-box DNA/RNA-binding factor, YB-1, and the multivalent zinc finger factor, CTCF. The Journal of Biological Chemistry. 2000-09-22, 275 (38): 29915–29921 [2018-10-01]. ISSN 0021-9258. PMID 10906122. doi:10.1074/jbc.M001538200. (原始內容存檔於2018-10-02). 
  20. ^ Kagey, Michael H.; Newman, Jamie J.; Bilodeau, Steve; Zhan, Ye; Orlando, David A.; van Berkum, Nynke L.; Ebmeier, Christopher C.; Goossens, Jesse; Rahl, Peter B. Mediator and cohesin connect gene expression and chromatin architecture. Nature. 2010-09-23, 467 (7314): 430–435 [2018-10-01]. ISSN 1476-4687. PMC 2953795可免費查閱. PMID 20720539. doi:10.1038/nature09380. (原始內容存檔於2018-10-02). 

衍生閱讀[編輯]