sandeep wrote:
> does anybody know why left handed helix is not found in naturally
> occuring proteins i got one PDB entry(1MIC) with a left handed protein
> please comment on it
Because with l-amino acids in a left handed helix the beta-carbon and
carbonyl-oxygen would collide. Since that is not possible, there would
be considerable strain on the backbone, which makes such a structure
improbable.
Both this and your other question could have been easily answered by
appropriate textbooks. Are you a troll?
