Polyproline Helices in Protein Structures: A Statistical Survey

Author(s): Rita Berisio, Salvatore Loguercio, Alfonso De Simone, Adriana Zagari, Luigi Vitagliano.

Journal Name: Protein & Peptide Letters

Volume 13 , Issue 8 , 2006

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Abstract:

A statistical survey of polyproline II (PPII) helices extracted from protein crystal structures is here reported. The average hydrophobicity of these helices is intermediate between those displayed by β-strands and coil regions and is similar to that of α-helices. PPII helices with amphipathic properties have been identified and classified. Amino acid propensities for PPII helices derived in this study differ significantly from those previously reported. They show a little albeit significant correlation with propensities for α-helices whereas they are fully non-correlated to propensities for β-sheets. Finally, PPII propensities have been correlated with amino acid frequencies in structural proteins, such as collagen and extensins.

Keywords: PPII helices, collagen, imino-acids, statistical survey, bioinformatics

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Article Details

VOLUME: 13
ISSUE: 8
Year: 2006
Page: [847 - 854]
Pages: 8
DOI: 10.2174/092986606777841154
Price: $58

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