Adaptation in protein fitness landscapes is facilitated by indirect paths

ELife
Nicholas C WuRen Sun

Abstract

The structure of fitness landscapes is critical for understanding adaptive protein evolution. Previous empirical studies on fitness landscapes were confined to either the neighborhood around the wild type sequence, involving mostly single and double mutants, or a combinatorially complete subgraph involving only two amino acids at each site. In reality, the dimensionality of protein sequence space is higher (20(L)) and there may be higher-order interactions among more than two sites. Here we experimentally characterized the fitness landscape of four sites in protein GB1, containing 20(4) = 160,000 variants. We found that while reciprocal sign epistasis blocked many direct paths of adaptation, such evolutionary traps could be circumvented by indirect paths through genotype space involving gain and subsequent loss of mutations. These indirect paths alleviate the constraint on adaptive protein evolution, suggesting that the heretofore neglected dimensions of sequence space may change our views on how proteins evolve.

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Related Concepts

Protein G', Streptococcus
Bacterial Proteins
Evolution, Molecular
Epistasis, Genetic
Biological Evolution
Site
Anatomical Space Structure
Adaptation
Structure
Empirical Study

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