4y65 is a 3 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
↑ Fong ST, Camakaris J, Lee BT. Molecular genetics of a chromosomal locus involved in copper tolerance in Escherichia coli K-12. Mol Microbiol. 1995 Mar;15(6):1127-37. PMID:7623666