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Livingstone EK, Mittelstädt G, Given FM, Parker EJ. Independent catalysis of the short form HisG from Lactococcus lactis. FEBS Lett 2016; 590:2603-10. [PMID: 27393206 DOI: 10.1002/1873-3468.12277] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 06/07/2016] [Accepted: 06/25/2016] [Indexed: 12/26/2022]
Abstract
ATP-phosphoribosyltransferase (ATP-PRT) catalyses the first step of histidine biosynthesis. Two different forms of ATP-PRT have been described; the homo-hexameric long form, and the hetero-octameric short form. Lactococcus lactis possesses the short form ATP-PRT comprising four subunits of HisGS , the catalytic subunit, and four subunits of HisZ, a histidyl-tRNA synthetase paralogue. Previous studies have suggested that HisGS requires HisZ for catalysis. Here, we reveal that the dimeric HisGS does display ATP-PRT activity in the absence of HisZ. This result reflects the evolutionary relationship between the long and short form ATP-PRT, which acquired allosteric inhibition and enhanced catalysis via two divergent strategies.
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Affiliation(s)
- Emma K Livingstone
- Department of Chemistry and Biomolecular Interaction Centre, University of Canterbury, Christchurch, New Zealand
| | - Gerd Mittelstädt
- Department of Chemistry and Biomolecular Interaction Centre, University of Canterbury, Christchurch, New Zealand
| | - Fiona M Given
- Department of Chemistry and Biomolecular Interaction Centre, University of Canterbury, Christchurch, New Zealand
| | - Emily J Parker
- Department of Chemistry and Biomolecular Interaction Centre, University of Canterbury, Christchurch, New Zealand
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Wan PJ, Tang YH, Yuan SY, Wang WX, Lai FX, Yu XP, Fu Q. ATP phosphoribosyltransferase from symbiont Entomomyces delphacidicola invovled in histidine biosynthesis of Nilaparvata lugens (Stål). Amino Acids 2016; 48:2605-2617. [PMID: 27373692 DOI: 10.1007/s00726-016-2287-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 06/22/2016] [Indexed: 12/11/2022]
Abstract
Histidine is an essential amino acid assumed to be synthesized by an obligatory yeast-like symbiont (Entomomyces delphacidicola str. NLU) in Nilaparvata lugens, an important rice pest. The adenosine-triphosphate phosphoribosyltransferase (ATP-PRTase) facilities the committed first step of the histidine biosynthesis pathway. In the current study, a putative ATP-PRTase was cloned and verified to be of E. delphacidicola origin (EdePRTase). The expression of the gene was spatial and temporal universal with a profile that matched the distribution of the fungal symbiont. RNA interference aided the knockdown of the EdePRTase-suppressed EdePRTase expression by 32-48 %. Hemolymph histidine level was also reduced followed by significant reduction of adult body weight. However, other performance characters including nymph development, survival, and adult sex ratio were not adversely affected by the knockdown. Furthermore, forced histidine exposure (through injection or feeding) significantly inhibited the EdePRTase mRNA levels at higher concentrations, but significantly increased EdePRTase expression levels at lower concentrations (feeding only). The significance of these findings support that the EdePRTase is from symbiont E. delphacidicola, and its involvement in histidine biosynthesis of N. lugens was discussed. The results provide a better understanding of EdePRTase and the encoded functional ATP-PRTase enzyme regulation in N. lugens and insects in general.
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Affiliation(s)
- Pin-Jun Wan
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
| | - Yao-Hua Tang
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China.,Zhejiang Provincial Key Laboratory of Biometrology and Inspection and Quarantine, College of Life Sciences, China Jiliang University, Hangzhou, 310018, China
| | - San-Yue Yuan
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
| | - Wei-Xia Wang
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
| | - Feng-Xiang Lai
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
| | - Xiao-Ping Yu
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection and Quarantine, College of Life Sciences, China Jiliang University, Hangzhou, 310018, China.
| | - Qiang Fu
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China.
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Mittelstädt G, Moggré GJ, Panjikar S, Nazmi AR, Parker EJ. Campylobacter jejuni adenosine triphosphate phosphoribosyltransferase is an active hexamer that is allosterically controlled by the twisting of a regulatory tail. Protein Sci 2016; 25:1492-506. [PMID: 27191057 DOI: 10.1002/pro.2948] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 05/08/2016] [Accepted: 05/11/2016] [Indexed: 02/03/2023]
Abstract
Adenosine triphosphate phosphoribosyltransferase (ATP-PRT) catalyzes the first committed step of the histidine biosynthesis in plants and microorganisms. Here, we present the functional and structural characterization of the ATP-PRT from the pathogenic ε-proteobacteria Campylobacter jejuni (CjeATP-PRT). This enzyme is a member of the long form (HisGL ) ATP-PRT and is allosterically inhibited by histidine, which binds to a remote regulatory domain, and competitively inhibited by AMP. In the crystalline form, CjeATP-PRT was found to adopt two distinctly different hexameric conformations, with an open homohexameric structure observed in the presence of substrate ATP, and a more compact closed form present when inhibitor histidine is bound. CjeATP-PRT was observed to adopt only a hexameric quaternary structure in solution, contradicting previous hypotheses favoring an allosteric mechanism driven by an oligomer equilibrium. Instead, this study supports the conclusion that the ATP-PRT long form hexamer is the active species; the tightening of this structure in response to remote histidine binding results in an inhibited enzyme.
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Affiliation(s)
- Gerd Mittelstädt
- Maurice Wilkins Centre, Biomolecular Interaction Centre, Christchurch, 8140, New Zealand.,Department of Chemistry, University of Canterbury, Christchurch, 8140, New Zealand
| | - Gert-Jan Moggré
- Maurice Wilkins Centre, Biomolecular Interaction Centre, Christchurch, 8140, New Zealand.,Department of Chemistry, University of Canterbury, Christchurch, 8140, New Zealand
| | - Santosh Panjikar
- Australian Synchrotron, Clayton, Melbourne, Victoria, 3168, Australia.,Department of Biochemistry and Molecular Biology, Monash University, Clayton, Campus, Melbourne, Victoria, 3800, Australia
| | - Ali Reza Nazmi
- Biomolecular Interaction Centre and School of Biological Sciences, University of Canterbury, Christchurch, 8140, New Zealand
| | - Emily J Parker
- Maurice Wilkins Centre, Biomolecular Interaction Centre, Christchurch, 8140, New Zealand.,Department of Chemistry, University of Canterbury, Christchurch, 8140, New Zealand
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