The condensin complex is a mechanochemical motor that translocates along DNA.

The condensin complex is a mechanochemical motor that translocates along DNA.
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DOI:
10.1126/science.aan6516
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发表时间:
2017-11-03
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Greene EC
Greene EC
中科院分区:
其他
文献类型:
--
作者:
Terakawa T;Bisht S;Eeftens JM;Dekker C;Haering CH;Greene EC

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凝聚蛋白在染色体组织和致密化中起着至关重要的作用,但其功能的机制基础仍然不清楚。我们使用单分子成像技术证明酿酒酵母凝聚素是一种分子马达,能够沿着沿着双链DNA进行腺苷三磷酸水解依赖性易位。凝聚素的转运活性是快速和高度进行性的,单个复合物以每秒约60个碱基对的速度移动≥10个酶的平均距离。我们的研究结果表明,凝聚素可能采取的步骤,其~50纳米的卷曲螺旋亚基的长度相当,这表明一个易位机制,是不同于任何报道的DNA马达蛋白。凝聚素是一种机械化学马达,这一发现对于理解染色体组织和凝聚的机制具有重要意义。
Condensin plays crucial roles in chromosome organization and compaction, but the mechanistic basis for its functions remains obscure. We used single-molecule imaging to demonstrate that Saccharomyces cerevisiae condensin is a molecular motor capable of adenosine triphosphate hydrolysis–dependent translocation along double-stranded DNA. Condensin’s translocation activity is rapid and highly processive, with individual complexes traveling an average distance of ≥10 kilobases at a velocity of ~60 base pairs per second. Our results suggest that condensin may take steps comparable in length to its ~50-nanometer coiled-coil subunits, indicative of a translocation mechanism that is distinct from any reported for a DNA motor protein. The finding that condensin is a mechanochemical motor has important implications for understanding the mechanisms of chromosome organization and condensation.
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发表时间: 2016-03-10
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