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Guo Y, Zhou D, Zhang H, Zhang NN, Qi X, Chen X, Chen Q, Li J, Ge H, Teng YB. Structural insights into a new substrate binding mode of a histidine acid phosphatase from Legionella pneumophila. Biochem Biophys Res Commun 2021; 540:90-94. [PMID: 33450485 DOI: 10.1016/j.bbrc.2020.12.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 12/18/2020] [Indexed: 10/22/2022]
Abstract
MapA is a histidine acid phosphatase (HAP) from Legionella pneumophila that catalyzes the hydroxylation of a phosphoryl group from phosphomonoesters by an active-site histidine. Several structures of HAPs, including MapA, in complex with the inhibitor tartrate have been solved and the substrate binding tunnel identified; however, the substrate recognition mechanism remains unknown. To gain insight into the mechanism of substrate recognition, the crystal structures of apo-MapA and the MapAD281A mutant in complex with 5'-AMP were solved at 2.2 and 2.6 Å resolution, respectively. The structure of the MapAD281A/5'-AMP complex reveals that the 5'-AMP fits fully into the substrate binding tunnel, with the 2'-hydroxyl group of the ribose moiety stabilized by Glu201 and the adenine moiety sandwiched between His205 and Phe237. This is the second structure of a HAP/AMP complex solved with 5'-AMP binding in a unique manner in the active site. The structure presents a new substrate recognition mechanism of HAPs.
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Affiliation(s)
- Yu Guo
- School of Life Sciences, Anhui Medical University, Hefei, Anhui, 230032, People's Republic of China.
| | - Dan Zhou
- Institute of Health Sciences and School of Life Science, Anhui University, Hefei, Anhui, 230601, People's Republic of China.
| | - Hui Zhang
- School of Life Sciences, Anhui Medical University, Hefei, Anhui, 230032, People's Republic of China.
| | - Nan-Nan Zhang
- Institute of Health Sciences and School of Life Science, Anhui University, Hefei, Anhui, 230601, People's Republic of China.
| | - Xiaoyu Qi
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of University of Science and Technology of China, Hefei, 230001, People's Republic of China.
| | - Xiaofang Chen
- Institute of Health Sciences and School of Life Science, Anhui University, Hefei, Anhui, 230601, People's Republic of China.
| | - Qi Chen
- School of Life Sciences, Anhui Medical University, Hefei, Anhui, 230032, People's Republic of China.
| | - Jing Li
- School of Life Sciences, Anhui Medical University, Hefei, Anhui, 230032, People's Republic of China.
| | - Honghua Ge
- Institute of Health Sciences and School of Life Science, Anhui University, Hefei, Anhui, 230601, People's Republic of China.
| | - Yan-Bin Teng
- School of Life Sciences, Anhui Medical University, Hefei, Anhui, 230032, People's Republic of China.
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Dhatwalia R, Singh H, Reilly TJ, Tanner JJ. Crystal structure and tartrate inhibition of Legionella pneumophila histidine acid phosphatase. Arch Biochem Biophys 2015; 585:32-38. [PMID: 26380880 DOI: 10.1016/j.abb.2015.09.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 09/03/2015] [Accepted: 09/12/2015] [Indexed: 11/28/2022]
Abstract
Histidine acid phosphatases (HAPs) utilize a nucleophilic histidine residue to catalyze the transfer of a phosphoryl group from phosphomonoesters to water. HAPs function as protein phosphatases and pain suppressors in mammals, are essential for Giardia lamblia excystation, and contribute to virulence of the category A pathogen Francisella tularensis. Herein we report the first crystal structure and steady-state kinetics measurements of the HAP from Legionella pneumophila (LpHAP), also known as Legionella major acid phosphatase. The structure of LpHAP complexed with the inhibitor l(+)-tartrate was determined at 2.0 Å resolution. Kinetics assays show that l(+)-tartrate is a 50-fold more potent inhibitor of LpHAP than of other HAPs. Electrostatic potential calculations provide insight into the basis for the enhanced tartrate potency: the tartrate pocket of LpHAP is more positive than other HAPs because of the absence of an ion pair partner for the second Arg of the conserved RHGXRXP HAP signature sequence. The structure also reveals that LpHAP has an atypically expansive active site entrance and lacks the nucleotide substrate base clamp found in other HAPs. These features imply that nucleoside monophosphates may not be preferred substrates. Kinetics measurements confirm that AMP is a relatively inefficient in vitro substrate of LpHAP.
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Affiliation(s)
- Richa Dhatwalia
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA
| | - Harkewal Singh
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA
| | - Thomas J Reilly
- Veterinary Medical Diagnostic Laboratory, University of Missouri-Columbia, Columbia, MO 65211, USA; Department of Veterinary Pathobiology, University of Missouri-Columbia, Columbia, MO 65211, USA
| | - John J Tanner
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA; Department of Biochemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.
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