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Jensen EL, Receveur-Brechot V, Hachemane M, Wils L, Barbier P, Parsiegla G, Gontero B, Launay H. Structural Contour Map of the Iota Carbonic Anhydrase from the Diatom Thalassiosira pseudonana Using a Multiprong Approach. Int J Mol Sci 2021; 22:ijms22168723. [PMID: 34445427 PMCID: PMC8395977 DOI: 10.3390/ijms22168723] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/10/2021] [Accepted: 08/11/2021] [Indexed: 02/07/2023] Open
Abstract
Carbonic anhydrases (CAs) are a family of ubiquitous enzymes that catalyze the interconversion of CO2 and HCO3−. The “iota” class (ι-CA) was first found in the marine diatom Thalassiosira pseudonana (tpι-CA) and is widespread among photosynthetic microalgae and prokaryotes. The ι-CA has a domain COG4875 (or COG4337) that can be repeated from one to several times and resembles a calcium–calmodulin protein kinase II association domain (CaMKII-AD). The crystal structure of this domain in the ι-CA from a cyanobacterium and a chlorarachniophyte has been recently determined. However, the three-dimensional organization of the four domain-containing tpι-CA is unknown. Using biophysical techniques and 3-D modeling, we show that the homotetrameric tpι-CA in solution has a flat “drone-like” shape with a core formed by the association of the first two domains of each monomer, and four protruding arms formed by domains 3 and 4. We also observe that the short linker between domains 3 and 4 in each monomer confers high flexibility, allowing for different conformations to be adopted. We propose the possible 3-D structure of a truncated tpι-CA containing fewer domain repeats using experimental data and discuss the implications of this atypical shape on the activity and metal coordination of the ι-CA.
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Affiliation(s)
- Erik L. Jensen
- Aix Marseille Univ, CNRS, BIP, UMR 7281, IMM, FR 3479, 31 Chemin J. Aiguier, CEDEX 20, 13 402 Marseille, France; (E.L.J.); (V.R.-B.); (M.H.); (L.W.); (G.P.)
| | - Véronique Receveur-Brechot
- Aix Marseille Univ, CNRS, BIP, UMR 7281, IMM, FR 3479, 31 Chemin J. Aiguier, CEDEX 20, 13 402 Marseille, France; (E.L.J.); (V.R.-B.); (M.H.); (L.W.); (G.P.)
| | - Mohand Hachemane
- Aix Marseille Univ, CNRS, BIP, UMR 7281, IMM, FR 3479, 31 Chemin J. Aiguier, CEDEX 20, 13 402 Marseille, France; (E.L.J.); (V.R.-B.); (M.H.); (L.W.); (G.P.)
| | - Laura Wils
- Aix Marseille Univ, CNRS, BIP, UMR 7281, IMM, FR 3479, 31 Chemin J. Aiguier, CEDEX 20, 13 402 Marseille, France; (E.L.J.); (V.R.-B.); (M.H.); (L.W.); (G.P.)
| | - Pascale Barbier
- Aix Marseille Univ, CNRS, INP, Inst Neurophysiopathol, 13 402 Marseille, France;
| | - Goetz Parsiegla
- Aix Marseille Univ, CNRS, BIP, UMR 7281, IMM, FR 3479, 31 Chemin J. Aiguier, CEDEX 20, 13 402 Marseille, France; (E.L.J.); (V.R.-B.); (M.H.); (L.W.); (G.P.)
| | - Brigitte Gontero
- Aix Marseille Univ, CNRS, BIP, UMR 7281, IMM, FR 3479, 31 Chemin J. Aiguier, CEDEX 20, 13 402 Marseille, France; (E.L.J.); (V.R.-B.); (M.H.); (L.W.); (G.P.)
- Correspondence: (B.G.); (H.L.)
| | - Hélène Launay
- Aix Marseille Univ, CNRS, BIP, UMR 7281, IMM, FR 3479, 31 Chemin J. Aiguier, CEDEX 20, 13 402 Marseille, France; (E.L.J.); (V.R.-B.); (M.H.); (L.W.); (G.P.)
- Correspondence: (B.G.); (H.L.)
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