Pro5 is not essential for the formation of ‘Ni-hook’ in nickel superoxide dismutase

Basak, Priyanka; Zambelli, Barbara; Cabelli, Diane E.; Ciurli, Stefano; Maroney, Michael J.

doi:10.1016/j.jinorgbio.2022.111858

Title: Pro5 is not essential for the formation of ‘Ni-hook’ in nickel superoxide dismutase

Journal Article · Sat May 21 00:00:00 EDT 2022 · Journal of Inorganic Biochemistry

DOI:https://doi.org/10.1016/j.jinorgbio.2022.111858· OSTI ID:1873169

Basak, Priyanka ^[1]; Zambelli, Barbara ^[2]; Cabelli, Diane E. ^[3]; Ciurli, Stefano ^[2]; Maroney, Michael J. ^[1]

Univ. of Massachusetts, Amherst, MA (United States)
Univ. of Bologna (Italy)
Brookhaven National Lab. (BNL), Upton, NY (United States)

The N-terminus of nickel-dependent superoxide dismutase (NiSOD) forms a structural motif known as the "Ni-hook," where the peptide wraps around the metal to bring cysteine-2 and cysteine-6 into spatial proximity, allowing these residues to coordinate in a cis-geometry. A highly conserved proline-5 residue in the Ni-hook adopts a cis-conformation that is widely considered important for its formation. Herein, we investigate this role by point mutation of Pro5 to alanine. The results obtained show that the variant exhibits wild-type-like redox catalysis and features a Ni(III) center very similar to that found in enzyme. Structural analysis using x-ray absorption spectroscopy of the nickel sites in as-isolated P5A-NiSOD reveals changes in the variant and are consistent with a six-coordinate Ni site with (N/O)₄S₂ coordination. These changes are attributed to changes in the Ni(II) site structure. Nickel-binding studies using isothermal titration calorimetry reveal two binding events with K_d = 25(20) nM, and 250(60) nM. These events are attributed to i) Ni(II) binding to a preformed Ni-hook containing cis-Pro5 and ii) the combination of trans- to cis- isomerization upon Ni(II) binding, respectively. Finally, the higher-affinity binding event is absent in P5A-NiSOD, an observation attributed to the low abundance of the cis-Ala5 isomer in the apo-protein.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; -AC02-76SF00515

OSTI ID:: 1873169

Report Number(s):: BNL-223091-2022-JAAM

Journal Information:: Journal of Inorganic Biochemistry, Vol. 234; ISSN 0162-0134

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Pro5 is not essential for the formation of ‘Ni-hook’ in nickel superoxide dismutase

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