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glossary:beta_turn [2008/08/11 10:27]
glossary:beta_turn [2008/09/17 12:41] (current)
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 +====== Beta Turn =======
 +A beta turn occurs where the polypeptide chain makes a sharp reversal by 180 degrees
 +within 4 residues. A turn is defined by 4 consecutive residues (i to i+3) if the C-alpha(i)
 +to C-alpha(i+3) distance is less than 7 angstroms, and if the central two residues are
 +not helical.  There is often a [[glossary:hydrogen_bond | hydrogen bond]] between the CO(i) and NH(i+3). There are several different types of beta turns (see references below).
 +===== References ====