B-DNA and A-DNA

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Sue4
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B-DNA and A-DNA

Post by Sue4 » Mon Aug 25, 2014 10:06 am

What does B in B-DNA stand for? And A in A-DNA? I couldn't find any answer by searching.I'm thankful if you can explain it to me. Thank you
:shock:

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JackBean
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Post by JackBean » Mon Aug 25, 2014 6:49 pm

I think it's just A as the first discovered and B as the next.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

Sue4
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Post by Sue4 » Tue Aug 26, 2014 3:27 am

Thank you.. But B-DNA is the normal Watson Crick double helix form of DNA isn't it? So it should be the one discovered first right?

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JackBean
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Post by JackBean » Tue Aug 26, 2014 6:54 pm

I don't know, but here http://en.wikipedia.org/wiki/DNA#Altern ... structures it sounds to me that the A-DNA is rather present in crystalographic studies.
Did they have it at such low resolution?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

noncentric
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Re: B-DNA and A-DNA

Post by noncentric » Wed Oct 29, 2014 12:09 pm

The "A" and "B" were arbitrary labels Rosie Franklin gave to the two types of DNA fibers she obtained under different conditions of salt concentration and relative humidity. She thought the A form was a potentially more interesting structure and wavered back and forth as to whether or not the A-form was helical, like the B-form clearly was. Franklin never received enough credit for her contributions.

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