PDBsum entry 3o4a

De novo protein

PDB id: 3o4a

Contents

Protein chains

123 a.a.

Ligands

TRS ×4

SO4 ×10

Waters ×624

References listed in PDB file

Key reference

• Title: Experimental support for the evolution of symmetric protein architecture from a simple peptide motif.
• Authors: J.Lee, M.Blaber.
• Ref.: Proc Natl Acad Sci U S A, 2011, 108, 126-130.
• PubMed id: 21173271

Abstract

The majority of protein architectures exhibit elements of structural symmetry, and "gene duplication and fusion" is the evolutionary mechanism generally hypothesized to be responsible for their emergence from simple peptide motifs. Despite the central importance of the gene duplication and fusion hypothesis, experimental support for a plausible evolutionary pathway for a specific protein architecture has yet to be effectively demonstrated. To address this question, a unique "top-down symmetric deconstruction" strategy was utilized to successfully identify a simple peptide motif capable of recapitulating, via gene duplication and fusion processes, a symmetric protein architecture (the threefold symmetric β-trefoil fold). The folding properties of intermediary forms in this deconstruction agree precisely with a previously proposed "conserved architecture" model for symmetric protein evolution. Furthermore, a route through foldable sequence-space between the simple peptide motif and extant protein fold is demonstrated. These results provide compelling experimental support for a plausible evolutionary pathway of symmetric protein architecture via gene duplication and fusion processes.