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mengsk

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[求助] 盐离子如何影响DNA和蛋白质

本人非生物专业,想请教两个问题:

1. 请问NDA的A, B, Z三种结构是不是受盐离子的调控?   

2. 盐对DNA或者蛋白质的构象和功能,大致有什么影响,能否大致分一下类?

最好给些综述文献。非常谢谢!
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mengsk

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希望能够得到更多专业的回复,和文献。
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4楼2013-10-22 16:28:28
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pennchem

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【答案】应助回帖

★ ★
感谢参与,应助指数 +1
mengsk: 金币+2, ★★★很有帮助 2013-10-22 16:17:07
(1)是DNA,受盐离子影响,也受湿度的影响

(2)盐离子可以中和蛋白质或者DNA的电荷,让蛋白质和DNA更加稳定(或者不稳定,取决于什么盐,还有盐离子的浓度),除非发生化学反应改变共价键,个人认为盐离子对蛋白或者核酸的构象影响没有那么大
行至水穷处,坐看云起时
2楼2013-10-22 09:24:53
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pennchem

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【答案】应助回帖

Form A :right handed double helix
Most RNA present in this form
Major conformation of RNA
the most favorable conformation at low concentration of water
Bases are displaced away from the axis
Major groove is narrow while minor groove is wide
Over all shape short and wide

Form B : Right handed double helix
the most common type of DNA
Major conformation of DNA
the most favorable conformation at high concentration of water
Bases are perpendicular to the axis
Major groove is wide while minor groove is narrow
Over all shape is long and narrow

Form z : Left handed double helix
Zigzag form
Minor conformation of DNA
the most favorable conformation at high concentration of salt
Bases are perpendicular to the axis
Both major and minor groove are narrow
Over all shape is elongate and narrow
行至水穷处,坐看云起时
3楼2013-10-22 09:30:00
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