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| + | {{tag>structure}} | ||
| + | ====== Crossover ======= | ||
| + | |||
| + | This is a term used to describe one possible type of backbone connection observed between | ||
| + | [[glossary:beta_strand |beta strands]] in which the chain loops around to re-enter the sheet on the opposite end. For [[glossary:beta_sheet | beta sheet]] connectivity, cross over connections are denoted by nx, | ||
| + | where n denotes how many strands it moves over in the sheet and in which direction. | ||
| + | +1x denotes a crossover connection between nearest neighbours, +2x | ||
| + | denotes a crossover connection that misses one intervening strand in the sheet, and so on. The term | ||
| + | 'crossover' has also been extended to include crossover loops which connect two sequential [[glossary:alpha_helix | alpha helices]] | ||
| + | that lie parallel in three dimensions. | ||
| + | |||
| + | The example shown is a transferase (CATH domain ID 1rwiA00)). | ||
| + | |||
| + | {{cath:feature>1rwiA00}} | ||
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| + | ===== References ===== | ||
| + | |||
| + | {{pubmed>long:183204}} | ||
| + | {{pubmed>long:329147}} | ||
