Freezing Transition of Compact Polyampholytes

Details Freezing Transition of Compact Polyampholytes Freezing Transition of Compact Polyampholytes

1996-09-05

arxiv.org/abs/cond-mat/9609062v1

Physics

Condensed Matter

4 pages, 3 eps figures

Scientific paper

10.1103/PhysRevLett.77.3565

Polyampholytes (PAs) are heteropolymers with long range Coulomb interactions. Unlike polymers with short range forces, PA energy levels have non-vanishing correlations and are thus very different from the Random Energy Model (REM). Nevertheless, if charges in the PA globule are screened as in a regular plasma, PAs freeze in REM fashion. Our results shed light on the potential role of Coulomb interactions in folding and evolution of {\it proteins}, which are weakly charged PAs, in particular making connection with the finding that sequences of charged amino acids in proteins are not random.

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