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--- glossary:crossover [2008/08/07 15:32] – cuff
+++ glossary:crossover [2008/09/19 10:31] (current) – garner
@@ Line 1: / Line 1: @@
+{{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}}
+===== References =====
+{{pubmed>long:183204}}
+{{pubmed>long:329147}}

CATH