A streptavidin variant with slower biotin dissociation and increased mechanostability.

A streptavidin variant with slower biotin dissociation and increased mechanostability.
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DOI:
10.1038/nmeth.1450
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发表时间:
2010-05
期刊:
影响因子:
48
通讯作者:
Howarth, Mark
Howarth, Mark
中科院分区:
生物学1区
文献类型:
--
作者:
Chivers, Claire E.;Crozat, Estelle;Chu, Calvin;Moy, Vincent T.;Sherratt, David J.;Howarth, Mark

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链霉亲和素结合生物素缀合物具有异常的稳定性,但解离确实发生,并且可能限制成像,DNA扩增和纳米技术。我们发现了一种突变的链霉亲和素,我们称之为traptavidin,显示出生物素解离速率慢10倍,机械强度增加,热稳定性提高;这种弹性应该找到不同的应用。我们发现,马达蛋白FtsK可以从DNA中剥离蛋白质,迅速取代链霉亲和素从生物素化的DNA,traptavidin抵抗位移,从而表明FtsK易位产生的力。
Streptavidin binds biotin-conjugates with exceptional stability, but dissociation does occur and can be limiting in imaging, DNA amplification, and nanotechnology. We identified a mutant streptavidin, which we call traptavidin, showing ~10-fold slower biotin off-rate, increased mechanical strength, and improved thermostability; this resilience should find diverse applications. We show that the motor protein FtsK could strip proteins from DNA, rapidly displacing streptavidin from biotinylated DNA; traptavidin resisted displacement and thus indicated the force generated by FtsK translocation.
FTSK的序列指导DNA负载和易位的分子机制。
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