Structural similarity of loops in protein families: toward the understanding of protein evolution.

Abstract excerpt

BACKGROUND: Protein evolution and protein classification are usually inferred by comparing protein cores in their conserved aligned parts. Structurally aligned protein regions are separated by less conserved loop regions, where sequence and structure locally deviate from each other and do not superimpose well. RESULTS: Our results indicate that even longer protein loops can not be viewed as "random coils" and for...

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