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- W2108480862 abstract "In the current study, the puckering states of the Proline ring occurring in diproline segments ((L) Pro-(L) Pro) in proteins has been investigated with a segregation made on the basis of cis and trans states for the Pro-Pro peptide bond and the conformational states for the diproline segment to investigate the effects of conformation of the diproline segment on the corresponding puckering state of the Proline ring in the segment if any. The value of the endocyclic ring torsional angles of the pyrrolidine ring has been used for calculating and visualizing various puckering states using a proposed new sign convention (+/-) nomenclature. The results have been compared to that obtained in a previous study on peptides from this group. In this study, quite interestingly, the Planar (G) conformation that was present in 14.3% of the cases in peptides, appears to be nearly a rare conformation in the case of proteins (1.9%). The present study indicates that the (C(γ)-exo/C(γ)-exo), (C(γ)-exo/Twisted C(γ)-exo-C(β)-endo) and (Twisted C(γ)-endo-C(β)-exo/Twisted C(γ)-endo-C(β)-exo) categories are the most preferred combinations. For Proline rings in proteins, the states C(γ)-exo, Twisted C(γ)-exo-C(β)-endo and Twisted C(γ)-endo-C(β)-exo are the most preferred states. Within diproline segments, the pyrrolidine ring conformations do not show a strong co-relation to the backbone conformation in which they are observed. It is likely that five-membered rings have a considerable plasticity of structure and are readily deformed to accommodate a variety of energetically preferred backbone conformations." @default.
- W2108480862 created "2016-06-24" @default.
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- W2108480862 date "2013-06-22" @default.
- W2108480862 modified "2023-10-09" @default.
- W2108480862 title "Investigating proline puckering states in diproline segments in proteins" @default.
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- W2108480862 doi "https://doi.org/10.1002/bip.22224" @default.
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