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. 1986 Feb 1;233(3):893–898. doi: 10.1042/bj2330893

An investigation of the ligand-binding properties of Pseudomonas aeruginosa nitrite reductase.

J Sutherland, C Greenwood, J Peterson, A J Thomson
PMCID: PMC1153113  PMID: 3010946

Abstract

The low-temperature e.p.r. and m.c.d. (magnetic-circular-dichroism) spectra of Pseudomonas aeruginosa nitrite reductase, together with those of its partially and fully cyanide-bound derivatives, were investigated. The m.c.d. spectra in the range 600-2000 nm indicate that the native axial ligands to haem c are histidine and methionine, and furthermore that it is the methionine ligand that must be displaced before cyanide binding at this haem. The m.c.d. spectra in the range 1000-2000 nm contain no charge-transfer bands arising from low-spin ferric haem d1, a chlorin. New optical transitions in the region 700-850 nm were found for the cyanide adduct of haem d1. The g-values of haem d1 in the native enzyme are 2.51, 2.43 and 1.71, suggesting co-ordination by two histidine ligands in the oxidized state. There is clear evidence in the e.p.r. data of an interaction between the c and d1 haem groups. This is not apparent in the optical spectra. The results are interpreted in terms of haem groups that are remote from each other, their interaction being mediated through protein conformational changes. The possible implications of this in relation to reduction processes catalysed by the enzyme are considered.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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