Reversible S-nitrosylation in an engineered azurin
- Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
- Stanford Univ., Stanford, CA (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Oregon Health & Sciences Univ., Portland, OR (United States)
Here, S-Nitrosothiols are known as reagents for NO storage and transportation and as regulators in many physiological processes. Although the S-nitrosylation catalysed by haem proteins is well known, no direct evidence of S-nitrosylation in copper proteins has been reported. Here, we report reversible insertion of NO into a copper–thiolate bond in an engineered copper centre in Pseudomonas aeruginosa azurin by rational design of the primary coordination sphere and tuning its reduction potential by deleting a hydrogen bond in the secondary coordination sphere. The results not only provide the first direct evidence of S-nitrosylation of Cu(II)-bound cysteine in metalloproteins, but also shed light on the reaction mechanism and structural features responsible for stabilizing the elusive Cu(I)–S(Cys)NO species. The fast, efficient and reversible S-nitrosylation reaction is used to demonstrate its ability to prevent NO inhibition of cytochrome bo3 oxidase activity by competing for NO binding with the native enzyme under physiologically relevant conditions.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- OSTI ID:
- 1340343
- Alternate ID(s):
- OSTI ID: 1351345
- Report Number(s):
- BNL--112002-2016-JA
- Journal Information:
- Nature Chemistry, Journal Name: Nature Chemistry Journal Issue: 7 Vol. 8; ISSN 1755-4330
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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