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Pi helix

pi helix

A rare right-handed helix found only in small portions of certain proteins. Stabilised by similar hydrogen bonds as in an a helix; there are 4.3 amino acid residues per turn of the helix.


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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: 926

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: 454

Help - Why can't DNA be parallel?

... know specifically what might happen or why it doesn't occur. Looking at it again though, I realized, does it have to do with the RH/LH-ness of the helix? Cause if you look at the phosphates of bottom image (my version), one strand will be twisting to the right, while the other strand will be to ...

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by keetner
Sun Sep 30, 2012 6:18 pm
 
Forum: Molecular Biology
Topic: Help - Why can't DNA be parallel?
Replies: 7
Views: 1437

Re: question for evolutionary biologist.

... During transcription, Enzymes called RNA polymerases build RNA molecules that are complementary to a portion of one strand of the DNA double helix. Now what is an enzyme? Guess what? It is a protein. This basic refresher tell us that a Protein is required at the start of a process to make ...

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by scottie
Sat Aug 25, 2012 10:40 pm
 
Forum: Evolution
Topic: question for evolutionary biologist.
Replies: 26
Views: 13543

What is a non-integral repeat in an alpha helix?

... is more important, because if it was exactly 4, then you would have all amino acids stacked one above other. Also, I think the hydrogen bonds in helix are not exactly linear.

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by JackBean
Thu Aug 16, 2012 3:07 pm
 
Forum: Molecular Biology
Topic: What is a non-integral repeat in an alpha helix?
Replies: 3
Views: 2344
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