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Lykins JD, Filippova EV, Halavaty AS, Minasov G, Zhou Y, Dubrovska I, Flores KJ, Shuvalova LA, Ruan J, El Bissati K, Dovgin S, Roberts CW, Woods S, Moulton JD, Moulton H, McPhillie MJ, Muench SP, Fishwick CWG, Sabini E, Shanmugam D, Roos DS, McLeod R, Anderson WF, Ngô HM. CSGID Solves Structures and Identifies Phenotypes for Five Enzymes in Toxoplasma gondii. Front Cell Infect Microbiol 2018; 8:352. [PMID: 30345257 PMCID: PMC6182094 DOI: 10.3389/fcimb.2018.00352] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 09/14/2018] [Indexed: 12/23/2022] Open
Abstract
Toxoplasma gondii, an Apicomplexan parasite, causes significant morbidity and mortality, including severe disease in immunocompromised hosts and devastating congenital disease, with no effective treatment for the bradyzoite stage. To address this, we used the Tropical Disease Research database, crystallography, molecular modeling, and antisense to identify and characterize a range of potential therapeutic targets for toxoplasmosis. Phosphoglycerate mutase II (PGMII), nucleoside diphosphate kinase (NDK), ribulose phosphate 3-epimerase (RPE), ribose-5-phosphate isomerase (RPI), and ornithine aminotransferase (OAT) were structurally characterized. Crystallography revealed insights into the overall structure, protein oligomeric states and molecular details of active sites important for ligand recognition. Literature and molecular modeling suggested potential inhibitors and druggability. The targets were further studied with vivoPMO to interrupt enzyme synthesis, identifying the targets as potentially important to parasitic replication and, therefore, of therapeutic interest. Targeted vivoPMO resulted in statistically significant perturbation of parasite replication without concomitant host cell toxicity, consistent with a previous CRISPR/Cas9 screen showing PGM, RPE, and RPI contribute to parasite fitness. PGM, RPE, and RPI have the greatest promise for affecting replication in tachyzoites. These targets are shared between other medically important parasites and may have wider therapeutic potential.
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Affiliation(s)
- Joseph D. Lykins
- Pritzker School of Medicine, University of Chicago, Chicago, IL, United States
| | - Ekaterina V. Filippova
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Andrei S. Halavaty
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - George Minasov
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Ying Zhou
- Department of Ophthalmology and Visual Sciences, University of Chicago, Chicago, IL, United States
| | - Ievgeniia Dubrovska
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Kristin J. Flores
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Ludmilla A. Shuvalova
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Jiapeng Ruan
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Kamal El Bissati
- Department of Ophthalmology and Visual Sciences, University of Chicago, Chicago, IL, United States
| | - Sarah Dovgin
- Illinois Math and Science Academy, Aurora, IL, United States
| | - Craig W. Roberts
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Stuart Woods
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | | | - Hong Moulton
- Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR, United States
| | - Martin J. McPhillie
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, United Kingdom
| | - Stephen P. Muench
- School of Biomedical Sciences, Faculty of Biological Sciences, and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Colin W. G. Fishwick
- School of Chemistry and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Elisabetta Sabini
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | | | - David S. Roos
- Department of Biology, University of Pennsylvania, Philadelphia, PA, United States
| | - Rima McLeod
- Department of Ophthalmology and Visual Sciences, University of Chicago, Chicago, IL, United States
- Department of Pediatrics (Infectious Diseases), Institute of Genomics, Genetics, and Systems Biology, Global Health Center, Toxoplasmosis Center, CHeSS, The College, University of Chicago, Chicago, IL, United States
| | - Wayne F. Anderson
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Huân M. Ngô
- Center for Structural Genomics of Infectious Diseases and the Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
- BrainMicro LLC, New Haven, CT, United States
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Fothergill-Gilmore LA, Watson HC. The phosphoglycerate mutases. ADVANCES IN ENZYMOLOGY AND RELATED AREAS OF MOLECULAR BIOLOGY 2006; 62:227-313. [PMID: 2543188 DOI: 10.1002/9780470123089.ch6] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The phosphoglycerate mutase family is generally very well documented with respect to structure, evolution, and mode of action. However, a few individuals in the family remain relatively poorly characterized and will clearly require more detailed study. Furthermore, certain aspects of the detailed behavior of these enzymes are, as yet, incompletely understood and require further investigation. Cofactor-dependent monophosphoglycerate mutase and bisphosphoglycerate mutase are undoubtedly very closely related. Their amino acid sequences are strongly similar, they can form active heterodimers, and they catalyze the same three reactions, albeit at substantially different relative rates. Both enzymes catalyze a ping-pong type of reaction with a phosphohistidine intermediate. The presence of an additional phospho ligand at the active site of monophosphoglycerate mutase helps to explain why this enzyme is better at retaining the 2,3-bisphosphoglycerate intermediate and why it is thus more efficient (by a factor of about 10(3)) at catalyzing the interconversion of 3- and 2-phosphoglycerates. The reason why 1,3-bisphosphoglycerate is a better substrate for bisphosphoglycerate mutase than for monophosphoglycerate mutase (by a factor of about 30) is not yet apparent but presumably relates to the relative positioning of the two phospho-binding sites. Both enzymes are equally good as phosphatases when the reaction is activated by 2-phosphoglycollate. Available evidence indicates that these mutases are similar in many respects to the much smaller, cofactor-dependent monophosphoglycerate mutase from Schizosaccharomyces pombe, but further information is required to define the relationship more precisely. Cofactor-independent monophosphoglycerate mutase belongs to a quite distinct branch of the phosphoglycerate mutase family. It is not known at present whether this branch is related divergently or convergently to the cofactor-dependent monophosphoglycerate mutase/bisphosphoglycerate mutase branch. Existing evidence can be argued both ways. For example, the kinetic evidence shows a ping-pong type of reaction and would be consistent with a phosphohistidine intermediate as encountered in the other mutases. Thus the cofactor-independent enzyme may also have arisen by gene duplication--but, in this case, yielding an enzyme of about twice the size, with slightly different residues at the active site and C-terminal tail. An alternative possibility, of course, is that the two branches of the phosphoglycerate mutase family are quite unrelated in a divergent sense and are little more similar structurally than is, for example, the catalytically similar enzyme phosphoglucomutase.(ABSTRACT TRUNCATED AT 400 WORDS)
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White MF, Fothergill-Gilmore LA. Development of a mutagenesis, expression and purification system for yeast phosphoglycerate mutase. Investigation of the role of active-site His181. EUROPEAN JOURNAL OF BIOCHEMISTRY 1992; 207:709-14. [PMID: 1386023 DOI: 10.1111/j.1432-1033.1992.tb17099.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A system has been developed to allow the convenient production, expression and purification of site-directed mutants of the enzyme phosphoglycerate mutase from Saccharomyces cerevisiae. This enzyme is well characterised; both the amino acid sequence and crystal structure have been determined and a reaction mechanism has been proposed. However, the molecular basis for catalysis remains poorly understood, with only circumstantial evidence for the roles of most of the active site residues other than His8, which is phosphorylated during the reaction cycle. A vector/host expression system has been designed which allows recombinant forms of phosphoglycerate mutase to be efficiently expressed in yeast with no background wild-type activity. A simple one-column purification protocol typically yields 30 mg pure enzyme/1 l of culture. The active-site residue, His181, which is thought to be involved in proton transfer during the catalytic cycle, has been mutated to an alanine. The resultant mutant has been purified and characterised. Kinetic analysis shows a large decrease (1.6 x 10(4)) in the catalytic efficiency, and an 11-fold increase in the Km for the cofactor 2,3-bisphosphoglycerate. These observations are consistent with an integral role for His181 in the reaction mechanism of phosphoglycerate mutase, probably as a general acid or base.
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Affiliation(s)
- M F White
- Department of Biochemistry, University of Edinburgh, Scotland
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