Anima: Could you please add some relevant references - Thanks.
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Khader Shameer
Beta Turn In Protein
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β-turns are supposed to be stable secondary structures promoting the formation of antiparallel β-sheets. So, I suppose its presence could stabilize β-barrels, which are tipycal transmembran structures based on antiparallel β-sheets.
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Anima Mundi
As elisa asked for opinions, I speculated a bit on β-turns' role with a syllogism: a) β-turns promote antiparallel β-sheets; b) β-barrels are based on antiparallel β-sheets; β-turns promote β-barrels. Beside this, Qamra R, Taneja B, Mande SC 2002 state: "Our study suggests that the conserved type II beta-turn and the non-polar residues in the barrel core are crucial for the folding of the protein's primary sequence into the beta-barrel conformation".
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Anima Mundi
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