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Zhu W, Klinman JP. Biogenesis of the peptide-derived redox cofactor pyrroloquinoline quinone. Curr Opin Chem Biol 2020; 59:93-103. [PMID: 32731194 PMCID: PMC7736144 DOI: 10.1016/j.cbpa.2020.05.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/04/2020] [Accepted: 05/06/2020] [Indexed: 12/15/2022]
Abstract
Pyrroloquinoline quinone (PQQ) is a peptide-derived redox cofactor produced by prokaryotes that also plays beneficial roles in organisms from other kingdoms. We review recent developments on the pathway of PQQ biogenesis, focusing on the mechanisms of PqqE, PqqF/G, and PqqB. These advances may shed light on other, uncharacterized biosynthetic pathways.
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Affiliation(s)
- Wen Zhu
- California Institute for Quantitative Biosciences and Department of Chemistry, University of California, Berkeley, CA, 94720-3220, USA
| | - Judith P Klinman
- California Institute for Quantitative Biosciences and Department of Chemistry, University of California, Berkeley, CA, 94720-3220, USA; Department of Molecular and Cell Biology, University of California, Berkeley, CA, 94720-3220, USA.
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Tu X, Latham JA, Klema VJ, Evans RL, Li C, Klinman JP, Wilmot CM. Crystal structures reveal metal-binding plasticity at the metallo-β-lactamase active site of PqqB from Pseudomonas putida. J Biol Inorg Chem 2017; 22:1089-1097. [PMID: 28825148 DOI: 10.1007/s00775-017-1486-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 08/16/2017] [Indexed: 02/02/2023]
Abstract
PqqB is an enzyme involved in the biosynthesis of pyrroloquinoline quinone and a distal member of the metallo-β-lactamase (MBL) superfamily. PqqB lacks two residues in the conserved signature motif HxHxDH that makes up the key metal-chelating elements that can bind up to two metal ions at the active site of MBLs and other members of its superfamily. Here, we report crystal structures of PqqB bound to Mn2+, Mg2+, Cu2+, and Zn2+. These structures demonstrate that PqqB can still bind metal ions at the canonical MBL active site. The fact that PqqB can adapt its side chains to chelate a wide spectrum of metal ions with different coordination features on a uniform main chain scaffold demonstrates its metal-binding plasticity. This plasticity may provide insights into the structural basis of promiscuous activities found in ensembles of metal complexes within this superfamily. Furthermore, PqqB belongs to a small subclass of MBLs that contain an additional CxCxxC motif that binds a structural Zn2+. Our data support a key role for this motif in dimerization.
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Affiliation(s)
- Xiongying Tu
- Department of Biochemistry, Molecular Biology, and Biophysics, and The Biotechnology Institute, University of Minnesota, St Paul, MN, 55108, USA
| | - John A Latham
- Departments of Chemistry, and Molecular and Cellular Biology, University of California, Berkeley, CA, 94720, USA
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO, 80208, USA
| | - Valerie J Klema
- Department of Biochemistry, Molecular Biology, and Biophysics, and The Biotechnology Institute, University of Minnesota, St Paul, MN, 55108, USA
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, 77555, USA
| | - Robert L Evans
- Department of Biochemistry, Molecular Biology, and Biophysics, and The Biotechnology Institute, University of Minnesota, St Paul, MN, 55108, USA
| | - Chao Li
- Department of Biochemistry, Molecular Biology, and Biophysics, and The Biotechnology Institute, University of Minnesota, St Paul, MN, 55108, USA
| | - Judith P Klinman
- Departments of Chemistry, and Molecular and Cellular Biology, University of California, Berkeley, CA, 94720, USA
| | - Carrie M Wilmot
- Department of Biochemistry, Molecular Biology, and Biophysics, and The Biotechnology Institute, University of Minnesota, St Paul, MN, 55108, USA.
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