Abstract
The manganese-dependent 3,4-dihydroxyphenylacetate 2,3-dioxygenase (MndD) from Arthrobacter globiformis CM-2 is an extradiol-cleaving catechol dioxygenase that catalyzes aromatic ring cleavage of 3,4-dihydroxyphenylacetate (DHPA). Based on the recent crystal structure of the MndD–DHPA complex, a series of site-directed mutations were made at a conserved second-sphere residue, histidine 200, to gain insight into and clarify the role this residue plays in the Mn(II)-dependent catalytic mechanism. In this study, we report the activities and spectroscopic data of these H200 variants and their DHPA and 4-nitrocatechol (4-NC) complexes. The data collected from wild-type and mutant MndDs are consistent with a role for H200 interacting with a manganese-bound dioxygen moiety and are inconsistent with other previously proposed roles involving proton transfer. Spectroscopic observations, including unique low-field EPR signals found when DHPA and 4-NC are bound to the Mn(II) center of MndD, are discussed and their relationship to dioxygen activation catalyzed in MndD is explored.
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Abbreviations
- BphC:
-
2,3-Dihydroxybiphenyl 1,2-dioxygenase
- CHMSA:
-
5-(Carboxymethyl)-2-hydroxymuconic semialdehyde
- CTD:
-
Catechol 2,3-dioxygenase from Pseudomonas stutzeri OX1
- DHPA:
-
3,4-Dihydroxyphenylacetate or homoprotocatechuate
- DHPP:
-
2,3-Dihydroxyphenyl propionic acid
- EPR:
-
Electron paramagnetic resonance
- HPCD:
-
Fe(II)-dependent 3,4-dihydroxyphenylacetate 2,3-dioxygenase from Brevibacterium fuscum
- Mb:
-
Myoglobin
- MhpB:
-
Fe(II)-dependent 2,3-dihydroxyphenylpropionate 1,2-dioxygenase from Escherichia coli
- MndD:
-
Mn(II)-dependent 3,4-dihydroxyphenylacetate 2,3-dioxygenase from Arthrobacter globiformis CM-2
- 4-NC:
-
4-Nitrocatechol
- ZFS:
-
Zero-field splitting
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Acknowledgments
This work was financially supported by grants from the National Institutes of Health (GM 43315 to LQ and LPW, GM 33162 to LQ, GM 08347 for MLW, and GM 072287 to JPE), the BioTechnology Institute at the University of Minnesota (LPW), and the University of Minnesota Agricultural Experiment Station (MJS).
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Emerson, J.P., Wagner, M.L., Reynolds, M.F. et al. The role of histidine 200 in MndD, the Mn(II)-dependent 3,4-dihydroxyphenylacetate 2,3-dioxygenase from Arthrobacter globiformis CM-2, a site-directed mutagenesis study. J Biol Inorg Chem 10, 751–760 (2005). https://doi.org/10.1007/s00775-005-0017-1
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DOI: https://doi.org/10.1007/s00775-005-0017-1