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A helix

A helix

The helical (commonly right-handed) form present in many proteins, deduced by Pauling and Corey from x-ray diffraction studies of proteins such as alpha-keratin; the helix is stabilised by hydrogen bonds between, e.g., ==C==O and HN== groups (symbolised by the centre dot in ==CO-HN==) of different eupeptide bonds. In a true a helix, there are 3.6 amino acid residues per turn of the helix.

Synonym: 3.613 helix, Pauling-Corey helix.

collagen helix, an extended left-handed helix resulting from the high levels of glycine, l-proline, and l-hydroxyproline present in the collagens. There are 3.3 amino acids per turn of the helix. Three of those left-handed helices form a triple superhelix that is right-handed.

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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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by Sue4
Tue Aug 26, 2014 3:27 am
Forum: Molecular Biology
Topic: B-DNA and A-DNA
Replies: 3
Views: 617

Protein structure

Hi guys, I know that Protein structure related to their function. Certain protein usually have alpha helix is more prominent but certain protein have beta structure more prominent. My question is which amino acid is favourable to form alpha helix and beta structure? What ...

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by kanagasundar
Sat Sep 14, 2013 2:40 am
Forum: Cell Biology
Topic: Protein structure
Replies: 1
Views: 864

DNA helix and gene

Do the two strands of DNA helix carry the same genetic information?

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by Fearnot
Sat Aug 17, 2013 10:30 am
Forum: Molecular Biology
Topic: DNA helix and gene
Replies: 2
Views: 2965

Questions on the Sodium Potassium Pump and Enzymes

... bonds between Okazaki fragments... What about when one job involves two enzymes ie. DNA Gyrase and DNA Helicase in unwinding the double helix or when an enzyme has two jobs such as DNA Polymerase forming phosphodiester bonds between nucleotides and adding new nucleotides to the RNA Primer. ...

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by JoWillyTso
Mon Nov 05, 2012 5:50 pm
Forum: Cell Biology
Topic: Questions on the Sodium Potassium Pump and Enzymes
Replies: 3
Views: 3793

Formation of helices in heterogeneous protein vs. homogeneou

... in a heterogeneous protein compared to homogeneous protein, other than the propensity for helices being sequence dependent. Relate it to the coil-helix transition, fractional helicity and melting temperature.

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by JordanGo
Fri Oct 19, 2012 8:16 pm
Forum: Cell Biology
Topic: Formation of helices in heterogeneous protein vs. homogeneou
Replies: 0
Views: 1198
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