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| + | {{tag>beta}} | ||
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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 ==== | ||
| + | |||
| + | {{pubmed>long:4351002}} | ||
| + | {{pubmed>long:4358939}} | ||
| + | {{pubmed>long:2865874}} | ||
| + | {{pubmed>long:2371257}} | ||
| + | {{pubmed>long:3184187}} | ||
| + | {{pubmed>long:7756980}} | ||
