Abstract:
:The bacterial CopC family of proteins are periplasmic copper binding proteins that act in copper detoxification. These proteins contain Cu(I) and/or Cu(II) binding sites, with the family that binds Cu(II) only the most prevalent, based on sequence analyses. Here we present three crystal structures of the CopC protein from Pseudomonas fluorescens (Pf-CopC) that include the wild type protein bound to Cu(II) and two variant proteins, where Cu(II) coordinating ligands were mutated, in Cu-free states. We show that the Cu(II) atom in Pf-CopC is coordinated by two His residues, an Asp residue and the N-terminus of the protein (therefore a 3N + O site). This coordination structure is consistent with all structurally characterized proteins from the CopC family to date. Structural and sequence analyses of the CopC family allow a relationship between protein sequence and the Cu(II) binding affinity of these proteins to be proposed.
journal_name
J Inorg Biochemjournal_title
Journal of inorganic biochemistryauthors
Udagedara SR,Wijekoon CJK,Xiao Z,Wedd AG,Maher MJdoi
10.1016/j.jinorgbio.2019.03.007subject
Has Abstractpub_date
2019-06-01 00:00:00pages
194-200eissn
0162-0134issn
1873-3344pii
S0162-0134(18)30753-0journal_volume
195pub_type
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