Biology – Quantitative Biology – Populations and Evolution
Scientific paper
2004-07-15
Biology
Quantitative Biology
Populations and Evolution
20 pages (including figures), 4 figures, to be submitted to PNAS
Scientific paper
10.1529/biophysj.104.051433
It has recently been discovered that many biological systems, when represented as graphs, exhibit a scale-free topology. One such system is the set of structural relationships among protein domains. The scale-free nature of this and other systems has previously been explained using network growth models that, while motivated by biological processes, do not explicitly consider the underlying physics or biology. In the present work we explore a sequence-based model for the evolution protein structures and demonstrate that this model is able to recapitulate the scale-free nature observed in graphs of real protein structures. We find that this model also reproduces other statistical feature of the protein domain graph. This represents, to our knowledge, the first such microscopic, physics-based evolutionary model for a scale-free network of biological importance and as such has strong implications for our understanding of the evolution of protein structures and of other biological networks.
Deeds Eric J.
Shakhnovich Eugene I.
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