Difference between alpha helix and beta-sheet
What is the basic difference between alpha helix and beta-sheet protein conformations?
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Alpha helix and beta-sheet conformations are the two major kinds of secondary structure of a protein molecule. According to primary protein structure, its secondary structure can be of one kind or other.
In alpha-helix structure, the polypeptide curls longitudinally by the act of hydrogen bonds making a spiral, or helix. In the beta-sheet conformation, the protein is much distended and the hydrogen bonds form a zigzag shaped protein structure termed as B-strand. Most of the assembled beta-strands form a beta-sheet.
At sequence alignment we do not get complete similarity for all the sequences. There will be similar regions as well as variable regions. The similar regions are structurally conserved regions (SCRs) where as the variable regions are variable regions (VRs).When we ali
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