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- W4238372945 abstract "Electrostatic interactions are important for protein folding. At low resolution, the electrostatic field of the whole molecule can be described in terms of charge center(s). To study electrostatic effects, the centers of positive and negative charge were calculated for 20 small proteins of known structure, for which hydrogen exchange cores had been determined experimentally. Two observations seem to be important. First, in all 20 proteins studied 30–100% of the residues forming hydrogen exchange core(s) were clustered around the charge centers. Moreover, in each protein more than half of the core sequences are located near the centers of charge. Second, the general architecture of all-α proteins from the set seems to be stabilized by interactions of residues surrounding the charge centers. In most of the α-β proteins, either or both of the centers are located near a pair of consecutive strands, and this is even more characteristic for α/B and all-β structures. Consecutive strands are very probable sites of early folding events. These two points lead to the conclusion that charge centers, defined solely from the structure of the folded protein may indicate the location of a protein's hydrogen exchange/folding core. In addition, almost all the proteins contain well-conserved continuous hydrophobic sequences of three or more residues located in the vicinity of the charge centers. These hydrophobic sequences may be primary nucleation sites for protein folding. The results suggest the following scheme for the order of events in folding: local hydrophobic nucleation, electrostatic collapse of the core, global hydrophobic collapse, and slow annealing to the native state. This analysis emphasizes the importance of treating electrostatics during protein-folding simulations. Proteins 2001;43:353–364. © 2001 Wiley-Liss, Inc." @default.
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- W4238372945 date "2001-06-01" @default.
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- W4238372945 title "Charge centers and formation of the protein folding core" @default.
- W4238372945 doi "https://doi.org/10.1002/prot.1048.abs" @default.
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