1. d.89.1 Origin of replication-binding domain, RBD-like Origin of replication-binding domain, RBD-like alpha-beta-alpha-beta(2)-alpha-beta-alpha-beta; 3 layers: a/b/a; antiparallel sheet 41325 1l5i d1l5ia_ A:24-36,39-52,54-66,76-80,110-115