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Esquirol L, Newman J, Nebl T, Scott C, Vickers C, Sainsbury F, Peat TS. Characterization of novel mevalonate kinases from the tardigrade Ramazzottius varieornatus and the psychrophilic archaeon Methanococcoides burtonii. Acta Crystallogr D Struct Biol 2024; 80:203-215. [PMID: 38411551 PMCID: PMC10910542 DOI: 10.1107/s2059798324001360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Accepted: 02/12/2024] [Indexed: 02/28/2024] Open
Abstract
Mevalonate kinase is central to the isoprenoid biosynthesis pathway. Here, high-resolution X-ray crystal structures of two mevalonate kinases are presented: a eukaryotic protein from Ramazzottius varieornatus and an archaeal protein from Methanococcoides burtonii. Both enzymes possess the highly conserved motifs of the GHMP enzyme superfamily, with notable differences between the two enzymes in the N-terminal part of the structures. Biochemical characterization of the two enzymes revealed major differences in their sensitivity to geranyl pyrophosphate and farnesyl pyrophosphate, and in their thermal stabilities. This work adds to the understanding of the structural basis of enzyme inhibition and thermostability in mevalonate kinases.
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Affiliation(s)
- Lygie Esquirol
- Environment, Commonwealth Scientific and Industrial Research Organisation, GPO Box 1700, Canberra, ACT 2601, Australia
| | - Janet Newman
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
| | - Tom Nebl
- Manufacturing, Commonwealth Scientific and Industrial Research Organisation, GPO Box 1700, Canberra, ACT 2601, Australia
| | - Colin Scott
- Environment, Commonwealth Scientific and Industrial Research Organisation, GPO Box 1700, Canberra, ACT 2601, Australia
- Advanced Engineering Biology Future Science Platform, Commonwealth Scientific and Industrial Research Organisation, GPO Box 1700, Canberra, ACT 2601, Australia
| | - Claudia Vickers
- Centre for Cell Factories and Biopolymers, Griffith Institute for Drug Discovery, Griffith University, Brisbane, QLD 4111, Australia
- Synbio Future Science Platform, Commonwealth Scientific and Industrial Research Organisation, GPO Box 1700, Canberra, ACT 2601, Australia
- Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Frank Sainsbury
- Centre for Cell Factories and Biopolymers, Griffith Institute for Drug Discovery, Griffith University, Brisbane, QLD 4111, Australia
- Synbio Future Science Platform, Commonwealth Scientific and Industrial Research Organisation, GPO Box 1700, Canberra, ACT 2601, Australia
| | - Thomas S. Peat
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
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2
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Tang P, Harding CJ, Dickson AL, da Silva RG, Harrison DJ, Czekster CM. Snapshots of the Reaction Coordinate of a Thermophilic 2'-Deoxyribonucleoside/ribonucleoside Transferase. ACS Catal 2024; 14:3090-3102. [PMID: 38449528 PMCID: PMC10913048 DOI: 10.1021/acscatal.3c06260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 01/24/2024] [Accepted: 01/26/2024] [Indexed: 03/08/2024]
Abstract
Nucleosides are ubiquitous to life and are required for the synthesis of DNA, RNA, and other molecules crucial for cell survival. Despite the notoriously difficult organic synthesis of nucleosides, 2'-deoxynucleoside analogues can interfere with natural DNA replication and repair and are successfully employed as anticancer, antiviral, and antimicrobial compounds. Nucleoside 2'-deoxyribosyltransferase (dNDT) enzymes catalyze transglycosylation via a covalent 2'-deoxyribosylated enzyme intermediate with retention of configuration, having applications in the biocatalytic synthesis of 2'-deoxynucleoside analogues in a single step. Here, we characterize the structure and function of a thermophilic dNDT, the protein from Chroococcidiopsis thermalis (CtNDT). We combined enzyme kinetics with structural and biophysical studies to dissect mechanistic features in the reaction coordinate, leading to product formation. Bell-shaped pH-rate profiles demonstrate activity in a broad pH range of 5.5-9.5, with two very distinct pKa values. A pronounced viscosity effect on the turnover rate indicates a diffusional step, likely product (nucleobase1) release, to be rate-limiting. Temperature studies revealed an extremely curved profile, suggesting a large negative activation heat capacity. We trapped a 2'-fluoro-2'-deoxyarabinosyl-enzyme intermediate by mass spectrometry and determined high-resolution structures of the protein in its unliganded, substrate-bound, ribosylated, 2'-difluoro-2'-deoxyribosylated, and in complex with probable transition-state analogues. We reveal key features underlying (2'-deoxy)ribonucleoside selection, as CtNDT can also use ribonucleosides as substrates, albeit with a lower efficiency. Ribonucleosides are the building blocks of RNA and other key intracellular metabolites participating in energy and metabolism, expanding the scope of use of CtNDT in biocatalysis.
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Affiliation(s)
- Peijun Tang
- School
of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom
| | - Christopher J. Harding
- School
of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom
| | - Alison L. Dickson
- School
of Medicine, University of St Andrews, North Haugh, St Andrews KY16 9TF, United Kingdom
| | - Rafael G. da Silva
- School
of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom
| | - David J. Harrison
- School
of Medicine, University of St Andrews, North Haugh, St Andrews KY16 9TF, United Kingdom
| | - Clarissa Melo Czekster
- School
of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom
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3
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Zhang J, Liu S, Chen M, Chu H, Wang M, Wang Z, Yu J, Ni N, Yu F, Chen D, Yang YI, Xue B, Yang L, Liu Y, Gao YQ. Unsupervisedly Prompting AlphaFold2 for Accurate Few-Shot Protein Structure Prediction. J Chem Theory Comput 2023; 19:8460-8471. [PMID: 37947474 DOI: 10.1021/acs.jctc.3c00528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
Data-driven predictive methods that can efficiently and accurately transform protein sequences into biologically active structures are highly valuable for scientific research and medical development. Determining an accurate folding landscape using coevolutionary information is fundamental to the success of modern protein structure prediction methods. As the state of the art, AlphaFold2 has dramatically raised the accuracy without performing explicit coevolutionary analysis. Nevertheless, its performance still shows strong dependence on available sequence homologues. Based on the interrogation on the cause of such dependence, we presented EvoGen, a meta generative model, to remedy the underperformance of AlphaFold2 for poor MSA targets. By prompting the model with calibrated or virtually generated homologue sequences, EvoGen helps AlphaFold2 fold accurately in the low-data regime and even achieve encouraging performance with single-sequence predictions. Being able to make accurate predictions with few-shot MSA not only generalizes AlphaFold2 better for orphan sequences but also democratizes its use for high-throughput applications. Besides, EvoGen combined with AlphaFold2 yields a probabilistic structure generation method that could explore alternative conformations of protein sequences, and the task-aware differentiable algorithm for sequence generation will benefit other related tasks including protein design.
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Affiliation(s)
- Jun Zhang
- Changping Laboratory, Beijing 102200, China
| | - Sirui Liu
- Changping Laboratory, Beijing 102200, China
| | - Mengyun Chen
- Huawei Hangzhou Research Institute, Huawei Technologies Co. Ltd., Hangzhou 310051, China
| | - Haotian Chu
- Huawei Hangzhou Research Institute, Huawei Technologies Co. Ltd., Hangzhou 310051, China
| | - Min Wang
- Huawei Hangzhou Research Institute, Huawei Technologies Co. Ltd., Hangzhou 310051, China
| | - Zidong Wang
- Huawei Hangzhou Research Institute, Huawei Technologies Co. Ltd., Hangzhou 310051, China
| | - Jialiang Yu
- Huawei Hangzhou Research Institute, Huawei Technologies Co. Ltd., Hangzhou 310051, China
| | - Ningxi Ni
- Huawei Hangzhou Research Institute, Huawei Technologies Co. Ltd., Hangzhou 310051, China
| | - Fan Yu
- Huawei Hangzhou Research Institute, Huawei Technologies Co. Ltd., Hangzhou 310051, China
| | - Dechin Chen
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen 518055, China
| | - Yi Isaac Yang
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen 518055, China
| | - Boxin Xue
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Lijiang Yang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yuan Liu
- Department of Chemical Biology, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yi Qin Gao
- Changping Laboratory, Beijing 102200, China
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen 518055, China
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Biomedical Pioneering Innovation Center, Peking University, Beijing 100871, China
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4
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Zhang W, Bhoobalan-Chitty Y, Zhai X, Hui Y, Hansen LH, Deng L, Peng X. Replication Protein Rep Provides Selective Advantage to Viruses in the Presence of CRISPR-Cas Immunity. CRISPR J 2023; 6:32-42. [PMID: 36576859 DOI: 10.1089/crispr.2022.0037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Anti-Clustered regularly interspaced small palindromic repeat (CRISPR) (Acr) phages cooperate to establish a successful infection in CRISPR-containing host. We report here the selective advantage provided by a replication initiator, Rep, toward cooperative host immunosuppression by viruses encoding Acrs. A rep knockout mutant (Δgp16) of Sulfolobus islandicus rod-shaped virus 2 produced around fourfold less virus in a CRISPR-null host, suggesting that Rep is the major replication initiator. In addition to Rep-dependent replication initiation from the viral genomic termini, we detected Rep-independent replication initiation from nonterminal sites. Intriguingly, despite the presence of Acrs, lack of Rep showed a profound effect on virus propagation in a host carrying CRISPR-Cas immunity. Accordingly, the co-infecting parental virus (rep-containing) outcompeted the Δgp16 mutant much more quickly in the CRISPR-containing host than in CRISPR-null host. Despite the nonessentiality, rep is carried by all known members of Rudiviridae, which is likely an evolutionary outcome driven by the ubiquitous presence of CRISPR-Cas in Sulfolobales.
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Affiliation(s)
- Weijia Zhang
- Department of Biology, University of Copenhagen, Copenhagen N, Denmark
| | | | - Xichuan Zhai
- Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
| | - Yan Hui
- Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
| | - Lars Hestbjerg Hansen
- Department of Plant and Environmental Science, University of Copenhagen, Frederiksberg, Denmark
| | - Ling Deng
- Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
| | - Xu Peng
- Department of Biology, University of Copenhagen, Copenhagen N, Denmark
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5
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Kadkhodazadeh M, Mohajel N, Behdani M, Baesi K, Khodaei B, Azadmanesh K, Arashkia A. Fiber manipulation and post-assembly nanobody conjugation for adenoviral vector retargeting through SpyTag-SpyCatcher protein ligation. Front Mol Biosci 2022; 9:1039324. [PMID: 36545512 PMCID: PMC9760943 DOI: 10.3389/fmolb.2022.1039324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 11/22/2022] [Indexed: 12/12/2022] Open
Abstract
For adenoviruses (Ads) to be optimally effective in cancer theranostics, they need to be retargeted toward target cells and lose their natural tropism. Typically, this is accomplished by either engineering fiber proteins and/or employing bispecific adapters, capable of bonding Ad fibers and tumor antigen receptors. This study aimed to present a simple and versatile method for generating Ad-based bionanoparticles specific to target cells, using the SpyTag-SpyCatcher system. The SpyTag peptide was inserted into the HI loop of fiber-knob protein, which could act as a covalent anchoring site for a targeting moiety fused to a truncated SpyCatcher (SpyCatcherΔ) pair. After confirming the presence and functionality of SpyTag on the Ad type-5 (Ad5) fiber knob, an adapter molecule, comprising of SpyCatcherΔ fused to an anti-vascular endothelial growth factor receptor 2 (VEGFR2) nanobody, was recombinantly expressed in Escherichia coli and purified before conjugation to fiber-modified Ad5 (fmAd5). After evaluating fmAd5 detargeting from its primary coxsackie and adenovirus receptor (CAR), the nanobody-decorated fmAd5 could be efficiently retargeted to VEGFR2-expressing 293/KDR and human umbilical vein endothelial (HUVEC) cell lines. In conclusion, a plug-and-play platform was described in this study for detargeting and retargeting Ad5 through the SpyTag-SpyCatcher system, which could be potentially applied to generate tailored bionanoparticles for a broad range of specific targets; therefore, it can be introduced as a promising approach in cancer nanotheranostics.
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Affiliation(s)
| | - Nasir Mohajel
- Department of Molecular Virology, Pasture Institute of Iran, Tehran, Iran
| | - Mahdi Behdani
- Venom and Biotherapeutics Molecules Laboratory, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Kazem Baesi
- Hepatitis and AIDS Department, Pasteur institute of Iran, Tehran, Iran
| | - Behzad Khodaei
- School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Kayhan Azadmanesh
- Department of Molecular Virology, Pasture Institute of Iran, Tehran, Iran,*Correspondence: Kayhan Azadmanesh, ; Arash Arashkia,
| | - Arash Arashkia
- Department of Molecular Virology, Pasture Institute of Iran, Tehran, Iran,*Correspondence: Kayhan Azadmanesh, ; Arash Arashkia,
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6
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Feathers JR, Richael EK, Simanek KA, Fromme JC, Paczkowski JE. Structure of the RhlR-PqsE complex from Pseudomonas aeruginosa reveals mechanistic insights into quorum-sensing gene regulation. Structure 2022; 30:1626-1636.e4. [PMID: 36379213 PMCID: PMC9722607 DOI: 10.1016/j.str.2022.10.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 08/26/2022] [Accepted: 10/20/2022] [Indexed: 11/16/2022]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen that is responsible for thousands of deaths every year in the United States. P. aeruginosa virulence factor production is mediated by quorum sensing, a mechanism of bacterial cell-cell communication that relies on the production and detection of signal molecules called autoinducers. In P. aeruginosa, the transcription factor receptor RhlR is activated by a RhlI-synthesized autoinducer. We recently showed that RhlR-dependent transcription is enhanced by a physical interaction with the enzyme PqsE via increased affinity of RhlR for promoter DNA. However, the molecular basis for complex formation and how complex formation enhanced RhlR transcriptional activity remained unclear. Here, we report the structure of ligand-bound RhlR in complex with PqsE. Additionally, we determined the structure of the complex bound with DNA, revealing the mechanism by which RhlR-mediated transcription is enhanced by PqsE, thereby establishing the molecular basis for RhlR-dependent virulence factor production in P. aeruginosa.
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Affiliation(s)
- J Ryan Feathers
- Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA
| | - Erica K Richael
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, NY 12208, USA
| | - Kayla A Simanek
- Department of Biomedical Sciences, University at Albany, School of Public Health, Albany, NY 12201, USA
| | - J Christopher Fromme
- Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA
| | - Jon E Paczkowski
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, NY 12208, USA; Department of Biomedical Sciences, University at Albany, School of Public Health, Albany, NY 12201, USA.
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7
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Abstract
Advances in our understanding of prokaryotic antiphage defense mechanisms in the past few years have revealed a multitude of new cyclic nucleotide signaling molecules that play a crucial role in switching infected cells into an antiviral state. Defense pathways including type III CRISPR (clustered regularly interspaced palindromic repeats), CBASS (cyclic nucleotide-based antiphage signaling system), PYCSAR (pyrimidine cyclase system for antiphage resistance), and Thoeris all use cyclic nucleotides as second messengers to activate a diverse range of effector proteins. These effectors typically degrade or disrupt key cellular components such as nucleic acids, membranes, or metabolites, slowing down viral replication kinetics at great cost to the infected cell. Mechanisms to manipulate the levels of cyclic nucleotides are employed by cells to regulate defense pathways and by viruses to subvert them. Here we review the discovery and mechanism of the key pathways, signaling molecules and effectors, parallels and differences between the systems, open questions, and prospects for future research in this area.
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Affiliation(s)
- Januka S Athukoralage
- Department of Microbiology and Immunology, University of California, San Francisco, California, USA
| | - Malcolm F White
- School of Biology, University of St Andrews, St Andrews, United Kingdom;
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8
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Karamycheva S, Wolf YI, Persi E, Koonin EV, Makarova KS. Analysis of lineage-specific protein family variability in prokaryotes combined with evolutionary reconstructions. Biol Direct 2022; 17:22. [PMID: 36042479 PMCID: PMC9425974 DOI: 10.1186/s13062-022-00337-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 08/13/2022] [Indexed: 12/24/2022] Open
Abstract
Background Evolutionary rate is a key characteristic of gene families that is linked to the functional importance of the respective genes as well as specific biological functions of the proteins they encode. Accurate estimation of evolutionary rates is a challenging task that requires precise phylogenetic analysis. Here we present an easy to estimate protein family level measure of sequence variability based on alignment column homogeneity in multiple alignments of protein sequences from Clade-Specific Clusters of Orthologous Genes (csCOGs). Results We report genome-wide estimates of variability for 8 diverse groups of bacteria and archaea and investigate the connection between variability and various genomic and biological features. The variability estimates are based on homogeneity distributions across amino acid sequence alignments and can be obtained for multiple groups of genomes at minimal computational expense. About half of the variance in variability values can be explained by the analyzed features, with the greatest contribution coming from the extent of gene paralogy in the given csCOG. The correlation between variability and paralogy appears to originate, primarily, not from gene duplication, but from acquisition of distant paralogs and xenologs, introducing sequence variants that are more divergent than those that could have evolved in situ during the lifetime of the given group of organisms. Both high-variability and low-variability csCOGs were identified in all functional categories, but as expected, proteins encoded by integrated mobile elements as well as proteins involved in defense functions and cell motility are, on average, more variable than proteins with housekeeping functions. Additionally, using linear discriminant analysis, we found that variability and fraction of genomes carrying a given gene are the two variables that provide the best prediction of gene essentiality as compared to the results of transposon mutagenesis in Sulfolobus islandicus. Conclusions Variability, a measure of sequence diversity within an alignment relative to the overall diversity within a group of organisms, offers a convenient proxy for evolutionary rate estimates and is informative with respect to prediction of functional properties of proteins. In particular, variability is a strong predictor of gene essentiality for the respective organisms and indicative of sub- or neofunctionalization of paralogs. Supplementary Information The online version contains supplementary material available at 10.1186/s13062-022-00337-7.
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Affiliation(s)
- Svetlana Karamycheva
- National Center for Biotechnology Information, National Library of Medicine, Bethesda, MD, 20894, USA
| | - Yuri I Wolf
- National Center for Biotechnology Information, National Library of Medicine, Bethesda, MD, 20894, USA
| | - Erez Persi
- National Center for Biotechnology Information, National Library of Medicine, Bethesda, MD, 20894, USA
| | - Eugene V Koonin
- National Center for Biotechnology Information, National Library of Medicine, Bethesda, MD, 20894, USA
| | - Kira S Makarova
- National Center for Biotechnology Information, National Library of Medicine, Bethesda, MD, 20894, USA.
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9
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SpySwitch enables pH- or heat-responsive capture and release for plug-and-display nanoassembly. Nat Commun 2022; 13:3714. [PMID: 35764623 PMCID: PMC9240080 DOI: 10.1038/s41467-022-31193-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 06/07/2022] [Indexed: 11/23/2022] Open
Abstract
Proteins can be empowered via SpyTag for anchoring and nanoassembly, through covalent bonding to SpyCatcher partners. Here we generate a switchable version of SpyCatcher, allowing gentle purification of SpyTagged proteins. We introduce numerous histidines adjacent to SpyTag’s binding site, giving moderate pH-dependent release. After phage-based selection, our final SpySwitch allows purification of SpyTag- and SpyTag003-fusions from bacterial or mammalian culture by capture at neutral pH and release at pH 5, with purity far beyond His-tag methods. SpySwitch is also thermosensitive, capturing at 4 °C and releasing at 37 °C. With flexible choice of eluent, SpySwitch-purified proteins can directly assemble onto multimeric scaffolds. 60-mer multimerization enhances immunogenicity and we use SpySwitch to purify receptor-binding domains from SARS-CoV-2 and 11 other sarbecoviruses. For these receptor-binding domains we determine thermal resilience (for mosaic vaccine development) and cross-recognition by antibodies. Antibody EY6A reacts across all tested sarbecoviruses, towards potential application against new coronavirus pandemic threats. The SpyCatcher-SpyTag system allows protein anchoring and nanoassembly. Here, the authors engineer SpySwitch, a dually switchable Catcher which allows gentle purification of SpyTagged proteins prior to downstream applications such as the assembly of virus-like particles.
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10
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Yang J, Banas VS, Patel KD, Rivera GSM, Mydy LS, Gulick AM, Wencewicz TA. An acyl-adenylate mimic reveals the structural basis for substrate recognition by the iterative siderophore synthetase DesD. J Biol Chem 2022; 298:102166. [PMID: 35750210 PMCID: PMC9356276 DOI: 10.1016/j.jbc.2022.102166] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 06/13/2022] [Accepted: 06/16/2022] [Indexed: 11/18/2022] Open
Abstract
Siderophores are conditionally essential metabolites used by microbes for environmental iron sequestration. Most Streptomyces strains produce hydroxamate-based desferrioxamine (DFO) siderophores composed of repeating units of N1-hydroxy-cadaverine (or N1-hydroxy-putrescine) and succinate. The DFO biosynthetic operon, desABCD, is highly conserved in Streptomyces; however, expression of desABCD alone does not account for the vast structural diversity within this natural product class. Here, we report the in vitro reconstitution and biochemical characterization of four DesD orthologs from Streptomyces strains that produce unique DFO siderophores. Under in vitro conditions, all four DesD orthologs displayed similar saturation steady-state kinetics (Vmax = 0.9–2.5 μM⋅min−1) and produced the macrocyclic trimer DFOE as the favored product, suggesting a conserved role for DesD in the biosynthesis of DFO siderophores. We further synthesized a structural mimic of N1-hydroxy-N1-succinyl-cadaverine (HSC)-acyl-adenylate, the HSC-acyl sulfamoyl adenosine analog (HSC-AMS), and obtained crystal structures of DesD in the ATP-bound, AMP/PPi-bound, and HSC-AMS/Pi-bound forms. We found HSC-AMS inhibited DesD orthologs (IC50 values = 48–53 μM) leading to accumulation of linear trimeric DFOG and di-HSC at the expense of macrocyclic DFOE. Addition of exogenous PPi enhanced DesD inhibition by HSC-AMS, presumably via stabilization of the DesD–HSC-AMS complex, similar to the proposed mode of adenylate stabilization where PPi remains buried in the active site. In conclusion, our data suggest that acyl-AMS derivatives may have utility as chemical probes and bisubstrate inhibitors to reveal valuable mechanistic and structural insight for this unique family of adenylating enzymes.
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Affiliation(s)
- Jinping Yang
- Department of Chemistry, Washington University in St Louis, St Louis, Missouri, USA
| | - Victoria S Banas
- Department of Chemistry, Washington University in St Louis, St Louis, Missouri, USA
| | - Ketan D Patel
- Department of Structural Biology, Jacobs School of Medicine & Biomedical Sciences at the University at Buffalo, Buffalo, New York, USA
| | - Gerry S M Rivera
- Department of Chemistry, Washington University in St Louis, St Louis, Missouri, USA
| | - Lisa S Mydy
- Department of Structural Biology, Jacobs School of Medicine & Biomedical Sciences at the University at Buffalo, Buffalo, New York, USA
| | - Andrew M Gulick
- Department of Structural Biology, Jacobs School of Medicine & Biomedical Sciences at the University at Buffalo, Buffalo, New York, USA.
| | - Timothy A Wencewicz
- Department of Chemistry, Washington University in St Louis, St Louis, Missouri, USA.
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11
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Sweeney P, Galliford A, Kumar A, Raju D, Krishna NB, Sutherland E, Leo CJ, Fisher G, Lalitha R, Muthuraj L, Sigamani G, Oehler V, Synowsky S, Shirran SL, Gloster TM, Czekster CM, Kumar P, da Silva RG. Structure, dynamics, and molecular inhibition of the Staphylococcus aureus m 1A22-tRNA methyltransferase TrmK. J Biol Chem 2022; 298:102040. [PMID: 35595101 PMCID: PMC9190014 DOI: 10.1016/j.jbc.2022.102040] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 05/02/2022] [Accepted: 05/04/2022] [Indexed: 11/29/2022] Open
Abstract
The enzyme m1A22-tRNA methyltransferase (TrmK) catalyzes the transfer of a methyl group to the N1 of adenine 22 in bacterial tRNAs. TrmK is essential for Staphylococcus aureus survival during infection but has no homolog in mammals, making it a promising target for antibiotic development. Here, we characterize the structure and function of S. aureus TrmK (SaTrmK) using X-ray crystallography, binding assays, and molecular dynamics simulations. We report crystal structures for the SaTrmK apoenzyme as well as in complexes with methyl donor SAM and co-product product SAH. Isothermal titration calorimetry showed that SAM binds to the enzyme with favorable but modest enthalpic and entropic contributions, whereas SAH binding leads to an entropic penalty compensated for by a large favorable enthalpic contribution. Molecular dynamics simulations point to specific motions of the C-terminal domain being altered by SAM binding, which might have implications for tRNA recruitment. In addition, activity assays for SaTrmK-catalyzed methylation of A22 mutants of tRNALeu demonstrate that the adenine at position 22 is absolutely essential. In silico screening of compounds suggested the multifunctional organic toxin plumbagin as a potential inhibitor of TrmK, which was confirmed by activity measurements. Furthermore, LC-MS data indicated the protein was covalently modified by one equivalent of the inhibitor, and proteolytic digestion coupled with LC-MS identified Cys92 in the vicinity of the SAM-binding site as the sole residue modified. These results identify a cryptic binding pocket of SaTrmK, laying a foundation for future structure-based drug discovery.
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Affiliation(s)
- Pamela Sweeney
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | - Ashleigh Galliford
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | | | - Dinesh Raju
- Kcat Enzymatic Private Limited, Bangalore, India
| | | | - Emmajay Sutherland
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | - Caitlin J Leo
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | - Gemma Fisher
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | | | | | | | - Verena Oehler
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | - Silvia Synowsky
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | - Sally L Shirran
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | - Tracey M Gloster
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | - Clarissa M Czekster
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK
| | - Pravin Kumar
- Kcat Enzymatic Private Limited, Bangalore, India.
| | - Rafael G da Silva
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 9ST, UK.
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12
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Caswell BT, de Carvalho CC, Nguyen H, Roy M, Nguyen T, Cantu DC. Thioesterase enzyme families: Functions, structures, and mechanisms. Protein Sci 2022; 31:652-676. [PMID: 34921469 PMCID: PMC8862431 DOI: 10.1002/pro.4263] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 12/11/2021] [Accepted: 12/14/2021] [Indexed: 12/12/2022]
Abstract
Thioesterases are enzymes that hydrolyze thioester bonds in numerous biochemical pathways, for example in fatty acid synthesis. This work reports known functions, structures, and mechanisms of updated thioesterase enzyme families, which are classified into 35 families based on sequence similarity. Each thioesterase family is based on at least one experimentally characterized enzyme, and most families have enzymes that have been crystallized and their tertiary structure resolved. Classifying thioesterases into families allows to predict tertiary structures and infer catalytic residues and mechanisms of all sequences in a family, which is particularly useful because the majority of known protein sequence have no experimental characterization. Phylogenetic analysis of experimentally characterized thioesterases that have structures with the two main structural folds reveal convergent and divergent evolution. Based on tertiary structure superimposition, catalytic residues are predicted.
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Affiliation(s)
- Benjamin T. Caswell
- Department of Chemical and Materials EngineeringUniversity of Nevada, RenoRenoNevadaUSA
| | - Caio C. de Carvalho
- Department of Chemical and Materials EngineeringUniversity of Nevada, RenoRenoNevadaUSA
| | - Hung Nguyen
- Department of Computer Science and EngineeringUniversity of Nevada, RenoRenoNevadaUSA
| | - Monikrishna Roy
- Department of Computer Science and EngineeringUniversity of Nevada, RenoRenoNevadaUSA
| | - Tin Nguyen
- Department of Computer Science and EngineeringUniversity of Nevada, RenoRenoNevadaUSA
| | - David C. Cantu
- Department of Chemical and Materials EngineeringUniversity of Nevada, RenoRenoNevadaUSA
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13
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Lewis AM, Recalde A, Bräsen C, Counts JA, Nussbaum P, Bost J, Schocke L, Shen L, Willard DJ, Quax TEF, Peeters E, Siebers B, Albers SV, Kelly RM. The biology of thermoacidophilic archaea from the order Sulfolobales. FEMS Microbiol Rev 2021; 45:fuaa063. [PMID: 33476388 PMCID: PMC8557808 DOI: 10.1093/femsre/fuaa063] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 11/26/2020] [Indexed: 12/13/2022] Open
Abstract
Thermoacidophilic archaea belonging to the order Sulfolobales thrive in extreme biotopes, such as sulfuric hot springs and ore deposits. These microorganisms have been model systems for understanding life in extreme environments, as well as for probing the evolution of both molecular genetic processes and central metabolic pathways. Thermoacidophiles, such as the Sulfolobales, use typical microbial responses to persist in hot acid (e.g. motility, stress response, biofilm formation), albeit with some unusual twists. They also exhibit unique physiological features, including iron and sulfur chemolithoautotrophy, that differentiate them from much of the microbial world. Although first discovered >50 years ago, it was not until recently that genome sequence data and facile genetic tools have been developed for species in the Sulfolobales. These advances have not only opened up ways to further probe novel features of these microbes but also paved the way for their potential biotechnological applications. Discussed here are the nuances of the thermoacidophilic lifestyle of the Sulfolobales, including their evolutionary placement, cell biology, survival strategies, genetic tools, metabolic processes and physiological attributes together with how these characteristics make thermoacidophiles ideal platforms for specialized industrial processes.
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Affiliation(s)
- April M Lewis
- Department of Chemical and Biomolecular Engineering, North Carolina State University. Raleigh, NC 27695, USA
| | - Alejandra Recalde
- Institute for Biology, Molecular Biology of Archaea, University of Freiburg, 79104 Freiburg, Germany
| | - Christopher Bräsen
- Department of Molecular Enzyme Technology and Biochemistry, Environmental Microbiology and Biotechnology, and Centre for Water and Environmental Research, University of Duisburg-Essen, 45117 Essen, Germany
| | - James A Counts
- Department of Chemical and Biomolecular Engineering, North Carolina State University. Raleigh, NC 27695, USA
| | - Phillip Nussbaum
- Institute for Biology, Molecular Biology of Archaea, University of Freiburg, 79104 Freiburg, Germany
| | - Jan Bost
- Institute for Biology, Molecular Biology of Archaea, University of Freiburg, 79104 Freiburg, Germany
| | - Larissa Schocke
- Department of Molecular Enzyme Technology and Biochemistry, Environmental Microbiology and Biotechnology, and Centre for Water and Environmental Research, University of Duisburg-Essen, 45117 Essen, Germany
| | - Lu Shen
- Department of Molecular Enzyme Technology and Biochemistry, Environmental Microbiology and Biotechnology, and Centre for Water and Environmental Research, University of Duisburg-Essen, 45117 Essen, Germany
| | - Daniel J Willard
- Department of Chemical and Biomolecular Engineering, North Carolina State University. Raleigh, NC 27695, USA
| | - Tessa E F Quax
- Archaeal Virus–Host Interactions, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Eveline Peeters
- Research Group of Microbiology, Department of Bioengineering Sciences, Vrije Universiteit Brussel, 1050 Brussels, Belgium
| | - Bettina Siebers
- Department of Molecular Enzyme Technology and Biochemistry, Environmental Microbiology and Biotechnology, and Centre for Water and Environmental Research, University of Duisburg-Essen, 45117 Essen, Germany
| | - Sonja-Verena Albers
- Institute for Biology, Molecular Biology of Archaea, University of Freiburg, 79104 Freiburg, Germany
| | - Robert M Kelly
- Department of Chemical and Biomolecular Engineering, North Carolina State University. Raleigh, NC 27695, USA
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14
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Keeble AH, Yadav VK, Ferla MP, Bauer CC, Chuntharpursat-Bon E, Huang J, Bon RS, Howarth M. DogCatcher allows loop-friendly protein-protein ligation. Cell Chem Biol 2021; 29:339-350.e10. [PMID: 34324879 PMCID: PMC8878318 DOI: 10.1016/j.chembiol.2021.07.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 06/09/2021] [Accepted: 07/02/2021] [Indexed: 12/14/2022]
Abstract
There are many efficient ways to connect proteins at termini. However, connecting at a loop is difficult because of lower flexibility and variable environment. Here, we have developed DogCatcher, a protein that forms a spontaneous isopeptide bond with DogTag peptide. DogTag/DogCatcher was generated initially by splitting a Streptococcus pneumoniae adhesin. We optimized DogTag/DogCatcher through rational design and evolution, increasing reaction rate by 250-fold and establishing millimolar solubility of DogCatcher. When fused to a protein terminus, DogTag/DogCatcher reacts slower than SpyTag003/SpyCatcher003. However, inserted in loops of a fluorescent protein or enzyme, DogTag reacts much faster than SpyTag003. Like many membrane proteins, the ion channel TRPC5 has no surface-exposed termini. DogTag in a TRPC5 extracellular loop allowed normal calcium flux and specific covalent labeling on cells in 1 min. DogTag/DogCatcher reacts under diverse conditions, at nanomolar concentrations, and to 98% conversion. Loop-friendly ligation should expand the toolbox for creating protein architectures. Spontaneous transamidation at internal sites harnessing a DogTag/DogCatcher pair DogCatcher is designed and bred for high solubility and rapid reaction Within protein loops DogTag can clamp on its partner faster than SpyTag003 Fast and faithful fluorescent labeling of an ion channel at the cell surface via DogTag
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Affiliation(s)
- Anthony H Keeble
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Vikash K Yadav
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Matteo P Ferla
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Claudia C Bauer
- Discovery and Translational Science Department, Leeds Institute of Cardiovascular and Metabolic Medicine, School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | - Eulashini Chuntharpursat-Bon
- Discovery and Translational Science Department, Leeds Institute of Cardiovascular and Metabolic Medicine, School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | - Jin Huang
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Robin S Bon
- Discovery and Translational Science Department, Leeds Institute of Cardiovascular and Metabolic Medicine, School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | - Mark Howarth
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
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15
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Thompson MK, Sobol RW, Prakash A. Exploiting DNA Endonucleases to Advance Mechanisms of DNA Repair. BIOLOGY 2021; 10:530. [PMID: 34198612 PMCID: PMC8232306 DOI: 10.3390/biology10060530] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 06/09/2021] [Accepted: 06/11/2021] [Indexed: 12/17/2022]
Abstract
The earliest methods of genome editing, such as zinc-finger nucleases (ZFN) and transcription activator-like effector nucleases (TALENs), utilize customizable DNA-binding motifs to target the genome at specific loci. While these approaches provided sequence-specific gene-editing capacity, the laborious process of designing and synthesizing recombinant nucleases to recognize a specific target sequence, combined with limited target choices and poor editing efficiency, ultimately minimized the broad utility of these systems. The discovery of clustered regularly interspaced short palindromic repeat sequences (CRISPR) in Escherichia coli dates to 1987, yet it was another 20 years before CRISPR and the CRISPR-associated (Cas) proteins were identified as part of the microbial adaptive immune system, by targeting phage DNA, to fight bacteriophage reinfection. By 2013, CRISPR/Cas9 systems had been engineered to allow gene editing in mammalian cells. The ease of design, low cytotoxicity, and increased efficiency have made CRISPR/Cas9 and its related systems the designer nucleases of choice for many. In this review, we discuss the various CRISPR systems and their broad utility in genome manipulation. We will explore how CRISPR-controlled modifications have advanced our understanding of the mechanisms of genome stability, using the modulation of DNA repair genes as examples.
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Affiliation(s)
- Marlo K. Thompson
- Mitchell Cancer Institute, University of South Alabama Health, Mobile, AL 36604, USA; (M.K.T.); (R.W.S.)
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, AL 36688, USA
| | - Robert W. Sobol
- Mitchell Cancer Institute, University of South Alabama Health, Mobile, AL 36604, USA; (M.K.T.); (R.W.S.)
- Department of Pharmacology, University of South Alabama, Mobile, AL 36688, USA
| | - Aishwarya Prakash
- Mitchell Cancer Institute, University of South Alabama Health, Mobile, AL 36604, USA; (M.K.T.); (R.W.S.)
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, AL 36688, USA
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16
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Vella P, Rudraraju RS, Lundbäck T, Axelsson H, Almqvist H, Vallin M, Schneider G, Schnell R. A FabG inhibitor targeting an allosteric binding site inhibits several orthologs from Gram-negative ESKAPE pathogens. Bioorg Med Chem 2021; 30:115898. [PMID: 33388594 DOI: 10.1016/j.bmc.2020.115898] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 11/22/2020] [Indexed: 11/26/2022]
Abstract
The spread of antibiotic resistance within the ESKAPE group of human pathogenic bacteria poses severe challenges in the treatment of infections and maintenance of safe hospital environments. This motivates efforts to validate novel target proteins within these species that could be pursued as potential targets for antibiotic development. Genetic data suggest that the enzyme FabG, which is part of the bacterial fatty acid biosynthetic system FAS-II, is essential in several ESKAPE pathogens. FabG catalyzes the NADPH dependent reduction of 3-keto-acyl-ACP during fatty acid elongation, thus enabling lipid supply for production and maintenance of the cell envelope. Here we report on small-molecule screening on the FabG enzymes from A. baumannii and S. typhimurium to identify a set of µM inhibitors, with the most potent representative (1) demonstrating activity against six FabG-orthologues. A co-crystal structure with FabG from A. baumannii (PDB:6T65) confirms inhibitor binding at an allosteric site located in the subunit interface, as previously demonstrated for other sub-µM inhibitors of FabG from P. aeruginosa. We show that inhibitor binding distorts the oligomerization interface in the FabG tetramer and displaces crucial residues involved in the interaction with the co-substrate NADPH. These observations suggest a conserved allosteric site across the FabG family, which can be potentially targeted for interference with fatty acid biosynthesis in clinically relevant ESKAPE pathogens.
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Affiliation(s)
- Peter Vella
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17 165 Stockholm, Sweden
| | | | - Thomas Lundbäck
- Chemical Biology Consortium Sweden, Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 65 Stockholm, Sweden
| | - Hanna Axelsson
- Chemical Biology Consortium Sweden, Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 65 Stockholm, Sweden
| | - Helena Almqvist
- Chemical Biology Consortium Sweden, Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 65 Stockholm, Sweden
| | - Michaela Vallin
- Chemical Biology Consortium Sweden, Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 65 Stockholm, Sweden
| | - Gunter Schneider
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17 165 Stockholm, Sweden
| | - Robert Schnell
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17 165 Stockholm, Sweden.
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17
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Mydy LS, Bailey DC, Patel KD, Rice MR, Gulick AM. The Siderophore Synthetase IucA of the Aerobactin Biosynthetic Pathway Uses an Ordered Mechanism. Biochemistry 2020; 59:2143-2153. [PMID: 32432457 DOI: 10.1021/acs.biochem.0c00250] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Biosynthesis of the hydroxamate siderophore aerobactin requires the activity of four proteins encoded within the iuc operon. Recently, we biochemically reconstituted the biosynthetic pathway and structurally characterized IucA and IucC, two enzymes that sequentially couple N6-acetyl-N6-hydroxylysine to the primary carboxylates of citrate. IucA and IucC are members of a family of non-ribosomal peptide synthetase-independent siderophore (NIS) synthetases that are involved in the production of other siderophores, including desferrioxamine, achromobactin, and petrobactin. While structures of several members of this family were solved previously, there is limited mechanistic insight into the reaction catalyzed by NIS synthetases. Therefore, we performed a terreactant steady-state kinetic analysis and herein provide evidence for an ordered mechanism in which the chemistry is preceded by the formation of the quaternary complex. We further probed two regions of the active site with site-directed mutagenesis and identified several residues, including a conserved motif that is present on a dynamic loop, that are important for substrate binding and catalysis.
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Affiliation(s)
- Lisa S Mydy
- Department of Structural Biology, University at Buffalo, The State University of New York, Buffalo, New York 14203, United States
| | - Daniel C Bailey
- Department of Structural Biology, University at Buffalo, The State University of New York, Buffalo, New York 14203, United States
| | - Ketan D Patel
- Department of Structural Biology, University at Buffalo, The State University of New York, Buffalo, New York 14203, United States
| | - Matthew R Rice
- Department of Structural Biology, University at Buffalo, The State University of New York, Buffalo, New York 14203, United States
| | - Andrew M Gulick
- Department of Structural Biology, University at Buffalo, The State University of New York, Buffalo, New York 14203, United States
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18
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Discovery and Characterization of Thermoproteus Spherical Piliferous Virus 1: a Spherical Archaeal Virus Decorated with Unusual Filaments. J Virol 2020; 94:JVI.00036-20. [PMID: 32213609 DOI: 10.1128/jvi.00036-20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 03/08/2020] [Indexed: 11/20/2022] Open
Abstract
We describe the discovery of an archaeal virus, one that infects archaea, tentatively named Thermoproteus spherical piliferous virus 1 (TSPV1), which was purified from a Thermoproteales host isolated from a hot spring in Yellowstone National Park (USA). TSPV1 packages an 18.65-kb linear double-stranded DNA (dsDNA) genome with 31 open reading frames (ORFs), whose predicted gene products show little homology to proteins with known functions. A comparison of virus particle morphologies and gene content demonstrates that TSPV1 is a new member of the Globuloviridae family of archaeal viruses. However, unlike other Globuloviridae members, TSPV1 has numerous highly unusual filaments decorating its surface, which can extend hundreds of nanometers from the virion. To our knowledge, similar filaments have not been observed in any other archaeal virus. The filaments are remarkably stable, remaining intact across a broad range of temperature and pH values, and they are resistant to chemical denaturation and proteolysis. A major component of the filaments is a glycosylated 35-kDa TSPV1 protein (TSPV1 GP24). The filament protein lacks detectable homology to structurally or functionally characterized proteins. We propose, given the low host cell densities of hot spring environments, that the TSPV1 filaments serve to increase the probability of virus attachment and entry into host cells.IMPORTANCE High-temperature environments have proven to be an important source for the discovery of new archaeal viruses with unusual particle morphologies and gene content. Our isolation of Thermoproteus spherical piliferous virus 1 (TSPV1), with numerous filaments extending from the virion surface, expands our understanding of viral diversity and provides new insight into viral replication in high-temperature environments.
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19
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Abboud A, Bédoucha P, Byška J, Arnesen T, Reuter N. Dynamics-function relationship in the catalytic domains of N-terminal acetyltransferases. Comput Struct Biotechnol J 2020; 18:532-547. [PMID: 32206212 PMCID: PMC7078549 DOI: 10.1016/j.csbj.2020.02.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 02/14/2020] [Accepted: 02/25/2020] [Indexed: 12/15/2022] Open
Abstract
N-terminal acetyltransferases (NATs) belong to the superfamily of acetyltransferases. They are enzymes catalysing the transfer of an acetyl group from acetyl coenzyme A to the N-terminus of polypeptide chains. N-terminal acetylation is one of the most common protein modifications. To date, not much is known on the molecular basis for the exclusive substrate specificity of NATs. All NATs share a common fold called GNAT. A characteristic of NATs is the β6β7 hairpin loop covering the active site and forming with the α1α2 loop a narrow tunnel surrounding the catalytic site in which cofactor and polypeptide meet and exchange an acetyl group. We investigated the dynamics-function relationships of all available structures of NATs covering the three domains of Life. Using an elastic network model and normal mode analysis, we found a common dynamics pattern conserved through the GNAT fold; a rigid V-shaped groove formed by the β4 and β5 strands and splitting the fold in two dynamical subdomains. Loops α1α2, β3β4 and β6β7 all show clear displacements in the low frequency normal modes. We characterized the mobility of the loops and show that even limited conformational changes of the loops along the low-frequency modes are able to significantly change the size and shape of the ligand binding sites. Based on the fact that these movements are present in most low-frequency modes, and common to all NATs, we suggest that the α1α2 and β6β7 loops may regulate ligand uptake and the release of the acetylated polypeptide.
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Affiliation(s)
- Angèle Abboud
- Department of Informatics, University of Bergen, Bergen, Norway
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway
| | - Pierre Bédoucha
- Department of Informatics, University of Bergen, Bergen, Norway
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway
| | - Jan Byška
- Department of Informatics, University of Bergen, Bergen, Norway
- Faculty of Informatics, Masaryk University, Brno, Czech Republic
| | - Thomas Arnesen
- Department of Biological Sciences, University of Bergen, Bergen, Norway
- Department of Biomedicine, University of Bergen, Bergen, Norway
- Department of Surgery, Haukeland University Hospital, Bergen, Norway
| | - Nathalie Reuter
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway
- Department of Chemistry, University of Bergen, Bergen, Norway
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20
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An anti-CRISPR viral ring nuclease subverts type III CRISPR immunity. Nature 2020; 577:572-575. [PMID: 31942067 PMCID: PMC6986909 DOI: 10.1038/s41586-019-1909-5] [Citation(s) in RCA: 107] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 11/14/2019] [Indexed: 02/07/2023]
Abstract
The CRISPR system in bacteria and archaea provides adaptive immunity against mobile genetic elements. Type III CRISPR systems detect viral RNA, resulting in the activation of two regions of the Cas10 protein: an HD nuclease domain (which degrades viral DNA)1,2 and a cyclase domain (which synthesizes cyclic oligoadenylates from ATP)3-5. Cyclic oligoadenylates in turn activate defence enzymes with a CRISPR-associated Rossmann fold domain6, sculpting a powerful antiviral response7-10 that can drive viruses to extinction7,8. Cyclic nucleotides are increasingly implicated in host-pathogen interactions11-13. Here we identify a new family of viral anti-CRISPR (Acr) enzymes that rapidly degrade cyclic tetra-adenylate (cA4). The viral ring nuclease AcrIII-1 is widely distributed in archaeal and bacterial viruses and in proviruses. The enzyme uses a previously unknown fold to bind cA4 specifically, and a conserved active site to rapidly cleave this signalling molecule, allowing viruses to neutralize the type III CRISPR defence system. The AcrIII-1 family has a broad host range, as it targets cA4 signalling molecules rather than specific CRISPR effector proteins. Our findings highlight the crucial role of cyclic nucleotide signalling in the conflict between viruses and their hosts.
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21
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Abstract
Interactions between proteins normally depend on a range of noncovalent contacts. Under challenging conditions, such as with mechanical force or over long time periods, noncovalent interactions break. Unbreakable protein–protein interactions, linked by covalent bonding, provide many opportunities for robust connection of molecular building blocks, including for biomaterials, enzymes, and vaccines. When evaluating unbreakable interactions, it is important to consider whether reaction happens quickly even at low concentrations. Here we establish a genetically encoded peptide that reacts with its genetically encoded protein partner with a speed close to the limit set by diffusion. We apply a range of biophysical methods to understand the dynamics required for this interaction, demonstrating applicability to rapid and specific detection in a range of species. Much of life’s complexity depends upon contacts between proteins with precise affinity and specificity. The successful application of engineered proteins often depends on high-stability binding to their target. In recent years, various approaches have enabled proteins to form irreversible covalent interactions with protein targets. However, the rate of such reactions is a major limitation to their use. Infinite affinity refers to the ideal where such covalent interaction occurs at the diffusion limit. Prototypes of infinite affinity pairs have been achieved using nonnatural reactive groups. After library-based evolution and rational design, here we establish a peptide–protein pair composed of the regular 20 amino acids that link together through an amide bond at a rate approaching the diffusion limit. Reaction occurs in a few minutes with both partners at low nanomolar concentration. Stopped flow fluorimetry illuminated the conformational dynamics involved in docking and reaction. Hydrogen–deuterium exchange mass spectrometry gave insight into the conformational flexibility of this split protein and the process of enhancing its reaction rate. We applied this reactive pair for specific labeling of a plasma membrane target in 1 min on live mammalian cells. Sensitive and specific detection was also confirmed by Western blot in a range of model organisms. The peptide–protein pair allowed reconstitution of a critical mechanotransmitter in the cytosol of mammalian cells, restoring cell adhesion and migration. This simple genetic encoding for rapid irreversible reaction should provide diverse opportunities to enhance protein function by rapid detection, stable anchoring, and multiplexing of protein functionality.
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22
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Oke M, Oni O, Bello R, Samuel-Omoyajowo K, Senbadejo T. Structure-function relationships of the 5-oxoprolinase subunit A: Guiding biological sciences students down the path less traveled. BIOCHEMISTRY AND MOLECULAR BIOLOGY EDUCATION : A BIMONTHLY PUBLICATION OF THE INTERNATIONAL UNION OF BIOCHEMISTRY AND MOLECULAR BIOLOGY 2019; 47:620-631. [PMID: 31520514 DOI: 10.1002/bmb.21300] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Revised: 08/02/2019] [Accepted: 08/22/2019] [Indexed: 06/10/2023]
Abstract
Bioinformatics was recently introduced as a module for both undergraduate and postgraduate biological sciences students at our institution. Our experience shows that inquiry-based hands-on exercises provide the most efficient approach to bioinformatic straining. In this article, we report a structural bioinformatics project carried out by Master degree students to determine structure-function relationships of the uncharacterized prokaryotic 5-oxoprolinase subunit A (PxpA). PxpA associates with the PxpBC complex to form a functional 5-oxoprolinase enzyme for conversion of 5-oxoproline to L-glutamate. Although the exact role of PxpA is yet to be determined, it has been demonstrated that PxpBC catalyses the first step of the reaction, which is phosphorylation of 5-oxoproline. Here, we provide evidence that PxpA is involved in the last two steps of the reaction:decyclization of the labile phosphorylated 5-oxoproline to the equally labile γ-glutamylphosphate, and subsequent dephosphorylation to L-glutamate. Structural bioinformatics analysis of four putative PxpA structures revealed that PxpA adopts a non-canonical TIM barrel fold with well-characterized TIM barrel enzyme features. These include a C-terminal groove comprising potentially essential conserved amino acid residues organized into putative motifs. Phylogenetic analysis suggests a relationship between taxonomic grouping and PxpA oligomerization. PxpA forms a tunnel upon ligand binding, thus suggesting that the PxpABC complex employs the mechanism of substrate channeling to protect labile intermediates. Ultimately, students were able to form a testable hypothesis on the function of PxpA, an achievement we consider encouraging other students to emulate. © 2019 International Union of Biochemistry and Molecular Biology, 47(6):620-631, 2019.
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Affiliation(s)
- Muse Oke
- Department of Biological Sciences, Fountain University, Osogbo, Nigeria
| | - Omobukola Oni
- Department of Chemical Sciences, Fountain University, Osogbo, Nigeria
| | - Ronke Bello
- Department of Chemical Sciences, Fountain University, Osogbo, Nigeria
| | | | - Tosin Senbadejo
- Department of Biological Sciences, Fountain University, Osogbo, Nigeria
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23
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Dávila-Ramos S, Castelán-Sánchez HG, Martínez-Ávila L, Sánchez-Carbente MDR, Peralta R, Hernández-Mendoza A, Dobson ADW, Gonzalez RA, Pastor N, Batista-García RA. A Review on Viral Metagenomics in Extreme Environments. Front Microbiol 2019; 10:2403. [PMID: 31749771 PMCID: PMC6842933 DOI: 10.3389/fmicb.2019.02403] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 10/04/2019] [Indexed: 12/22/2022] Open
Abstract
Viruses are the most abundant biological entities in the biosphere, and have the ability to infect Bacteria, Archaea, and Eukaryotes. The virome is estimated to be at least ten times more abundant than the microbiome with 107 viruses per milliliter and 109 viral particles per gram in marine waters and sediments or soils, respectively. Viruses represent a largely unexplored genetic diversity, having an important role in the genomic plasticity of their hosts. Moreover, they also play a significant role in the dynamics of microbial populations. In recent years, metagenomic approaches have gained increasing popularity in the study of environmental viromes, offering the possibility of extending our knowledge related to both virus diversity and their functional characterization. Extreme environments represent an interesting source of both microbiota and their virome due to their particular physicochemical conditions, such as very high or very low temperatures and >1 atm hydrostatic pressures, among others. Despite the fact that some progress has been made in our understanding of the ecology of the microbiota in these habitats, few metagenomic studies have described the viromes present in extreme ecosystems. Thus, limited advances have been made in our understanding of the virus community structure in extremophilic ecosystems, as well as in their biotechnological potential. In this review, we critically analyze recent progress in metagenomic based approaches to explore the viromes in extreme environments and we discuss the potential for new discoveries, as well as methodological challenges and perspectives.
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Affiliation(s)
- Sonia Dávila-Ramos
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - Hugo G. Castelán-Sánchez
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - Liliana Martínez-Ávila
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | | | - Raúl Peralta
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - Armando Hernández-Mendoza
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - Alan D. W. Dobson
- School of Microbiology, University College Cork, Cork, Ireland
- Environmental Research Institute, University College Cork, Cork, Ireland
| | - Ramón A. Gonzalez
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - Nina Pastor
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - Ramón Alberto Batista-García
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
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Lux MC, Standke LC, Tan DS. Targeting adenylate-forming enzymes with designed sulfonyladenosine inhibitors. J Antibiot (Tokyo) 2019; 72:325-349. [PMID: 30982830 PMCID: PMC6594144 DOI: 10.1038/s41429-019-0171-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 02/19/2019] [Accepted: 02/26/2019] [Indexed: 02/07/2023]
Abstract
Adenylate-forming enzymes are a mechanistic superfamily that are involved in diverse biochemical pathways. They catalyze ATP-dependent activation of carboxylic acid substrates as reactive acyl adenylate (acyl-AMP) intermediates and subsequent coupling to various nucleophiles to generate ester, thioester, and amide products. Inspired by natural products, acyl sulfonyladenosines (acyl-AMS) that mimic the tightly bound acyl-AMP reaction intermediates have been developed as potent inhibitors of adenylate-forming enzymes. This simple yet powerful inhibitor design platform has provided a wide range of biological probes as well as several therapeutic lead compounds. Herein, we provide an overview of the nine structural classes of adenylate-forming enzymes and examples of acyl-AMS inhibitors that have been developed for each.
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Affiliation(s)
- Michaelyn C Lux
- Tri-Institutional PhD Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY, 10065, USA
| | - Lisa C Standke
- Pharmacology Graduate Program, Weill Cornell Graduate School of Medical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY, 10065, USA
| | - Derek S Tan
- Tri-Institutional PhD Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY, 10065, USA. .,Pharmacology Graduate Program, Weill Cornell Graduate School of Medical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY, 10065, USA. .,Chemical Biology Program, Sloan Kettering Institute, and Tri-Institutional Research Program, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY, 10065, USA.
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25
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Ronan JL, Kadi N, McMahon SA, Naismith JH, Alkhalaf LM, Challis GL. Desferrioxamine biosynthesis: diverse hydroxamate assembly by substrate-tolerant acyl transferase DesC. Philos Trans R Soc Lond B Biol Sci 2019; 373:rstb.2017.0068. [PMID: 29685972 DOI: 10.1098/rstb.2017.0068] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2017] [Indexed: 12/16/2022] Open
Abstract
Hydroxamate groups play key roles in the biological function of diverse natural products. Important examples include trichostatin A, which inhibits histone deacetylases via coordination of the active site zinc(II) ion with a hydroxamate group, and the desferrioxamines, which use three hydroxamate groups to chelate ferric iron. Desferrioxamine biosynthesis in Streptomyces species involves the DesD-catalysed condensation of various N-acylated derivatives of N-hydroxycadaverine with two molecules of N-succinyl-N-hydroxycadaverine to form a range of linear and macrocyclic tris-hydroxamates. However, the mechanism for assembly of the various N-acyl-N-hydroxycadaverine substrates of DesD from N-hydroxycadaverine has until now been unclear. Here we show that the desC gene of Streptomyces coelicolor encodes the acyl transferase responsible for this process. DesC catalyses the N-acylation of N-hydroxycadaverine with acetyl, succinyl and myristoyl-CoA, accounting for the diverse array of desferrioxamines produced by S. coelicolor The X-ray crystal structure of DesE, the ferrioxamine lipoprotein receptor, in complex with ferrioxamine B (which is derived from two units of N-succinyl-N-hydroxycadaverine and one of N-acetyl-N-hydroxycadaverine) was also determined. This showed that the acetyl group of ferrioxamine B is solvent exposed, suggesting that the corresponding acyl group in longer chain congeners can protrude from the binding pocket, providing insights into their likely function. This article is part of a discussion meeting issue 'Frontiers in epigenetic chemical biology'.This article is part of a discussion meeting issue 'Frontiers in epigenetic chemical biology'.
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Affiliation(s)
- Jade L Ronan
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - Nadia Kadi
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - Stephen A McMahon
- Biomedical Sciences Research Complex, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
| | - James H Naismith
- Biomedical Sciences Research Complex, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
| | - Lona M Alkhalaf
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - Gregory L Challis
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
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26
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Wang D, Weng J, Wang W. An unconventional ligand‐binding mechanism of substrate‐binding proteins: MD simulation and Markov state model analysis of BtuF. J Comput Chem 2019; 40:1440-1448. [DOI: 10.1002/jcc.25798] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 12/22/2018] [Accepted: 01/28/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Dongdong Wang
- Department of Chemistry, Institutes of Biomedical Sciences and Multiscale Research Institute of Complex System Fudan University Shanghai 200438 People's Republic of China
| | - Jingwei Weng
- Department of Chemistry, Institutes of Biomedical Sciences and Multiscale Research Institute of Complex System Fudan University Shanghai 200438 People's Republic of China
| | - Wenning Wang
- Department of Chemistry, Institutes of Biomedical Sciences and Multiscale Research Institute of Complex System Fudan University Shanghai 200438 People's Republic of China
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27
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Wang W, Liu Z, Zhou X, Guo Z, Zhang J, Zhu P, Yao S, Zhu M. Ferritin nanoparticle-based SpyTag/SpyCatcher-enabled click vaccine for tumor immunotherapy. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2019; 16:69-78. [DOI: 10.1016/j.nano.2018.11.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 10/23/2018] [Accepted: 11/19/2018] [Indexed: 01/21/2023]
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28
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Rouillon C, Athukoralage JS, Graham S, Grüschow S, White MF. Investigation of the cyclic oligoadenylate signaling pathway of type III CRISPR systems. Methods Enzymol 2019; 616:191-218. [PMID: 30691643 DOI: 10.1016/bs.mie.2018.10.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Type III CRISPR effector complexes utilize a bound CRISPR RNA (crRNA) to detect the presence of RNA from invading mobile genetic elements in the cell. This RNA binding results in the activation of two enzymatic domains of the Cas10 subunit-the HD nuclease domain, which degrades DNA, and PALM/cyclase domain. The latter synthesizes cyclic oligoadenylate (cOA) molecules by polymerizing ATP, and cOA acts as a second messenger in the cell, switching on the antiviral response by activating host ribonucleases and other proteins. In this chapter, we focus on the methods required to study the biochemistry of this recently discovered cOA signaling pathway. We cover protein expression and purification, synthesis of cOA and its linear analogues, kinetic analysis of cOA synthesis and cOA-stimulated ribonuclease activity, and small molecule detection and identification with thin-layer chromatography and mass spectrometry. The methods described are based on our recent studies of the type III CRISPR system in Sulfolobus solfataricus, but are widely applicable to other type III systems.
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Affiliation(s)
- Christophe Rouillon
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, St Andrews, Fife, United Kingdom
| | - Januka S Athukoralage
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, St Andrews, Fife, United Kingdom
| | - Shirley Graham
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, St Andrews, Fife, United Kingdom
| | - Sabine Grüschow
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, St Andrews, Fife, United Kingdom
| | - Malcolm F White
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, St Andrews, Fife, United Kingdom.
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29
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Miller BR, Kung Y. Structural insight into substrate and product binding in an archaeal mevalonate kinase. PLoS One 2018; 13:e0208419. [PMID: 30521590 PMCID: PMC6283576 DOI: 10.1371/journal.pone.0208419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 11/18/2018] [Indexed: 12/03/2022] Open
Abstract
Mevalonate kinase (MK) is a key enzyme of the mevalonate pathway, which produces the biosynthetic precursors for steroids, including cholesterol, and isoprenoids, the largest class of natural products. Currently available crystal structures of MK from different organisms depict the enzyme in its unbound, substrate-bound, and inhibitor-bound forms; however, until now no structure has yet been determined of MK bound to its product, 5-phosphomevalonate. Here, we present crystal structures of mevalonate-bound and 5-phosphomevalonate-bound MK from Methanosarcina mazei (MmMK), a methanogenic archaeon. In contrast to the prior structure of a eukaryotic MK bound with mevalonate, we find a striking lack of direct interactions between this archaeal MK and its substrate. Further, these two MmMK structures join the prior structure of the apoenzyme to complete the first suite of structural snapshots that depict unbound, substrate-bound, and product-bound forms of the same MK. With this collection of structures, we now provide additional insight into the catalytic mechanism of this biologically essential enzyme.
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Affiliation(s)
- Bradley R. Miller
- Department of Chemistry, Bryn Mawr College, Bryn Mawr, PA, United States of America
| | - Yan Kung
- Department of Chemistry, Bryn Mawr College, Bryn Mawr, PA, United States of America
- * E-mail:
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30
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Carroll CS, Moore MM. Ironing out siderophore biosynthesis: a review of non-ribosomal peptide synthetase (NRPS)-independent siderophore synthetases. Crit Rev Biochem Mol Biol 2018; 53:356-381. [DOI: 10.1080/10409238.2018.1476449] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
| | - Margo M. Moore
- Department of Biological Sciences, Simon Fraser University, Burnaby, Canada
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31
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A complete structural characterization of the desferrioxamine E biosynthetic pathway from the fire blight pathogen Erwinia amylovora. J Struct Biol 2018; 202:236-249. [DOI: 10.1016/j.jsb.2018.02.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/30/2018] [Accepted: 02/07/2018] [Indexed: 01/01/2023]
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32
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Drees SL, Ernst S, Belviso BD, Jagmann N, Hennecke U, Fetzner S. PqsL uses reduced flavin to produce 2-hydroxylaminobenzoylacetate, a preferred PqsBC substrate in alkyl quinolone biosynthesis in Pseudomonas aeruginosa. J Biol Chem 2018; 293:9345-9357. [PMID: 29669807 DOI: 10.1074/jbc.ra117.000789] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 04/06/2018] [Indexed: 01/05/2023] Open
Abstract
Alkyl hydroxyquinoline N-oxides (AQNOs) are antibiotic compounds produced by the opportunistic bacterial pathogen Pseudomonas aeruginosa They are products of the alkyl quinolone (AQ) biosynthetic pathway, which also generates the quorum-sensing molecules 2-heptyl-4(1H)-quinolone (HHQ) and 2-heptyl-3-hydroxy-4(1H)-quinolone (PQS). Although the enzymatic synthesis of HHQ and PQS had been elucidated, the route by which AQNOs are synthesized remained elusive. Here, we report on PqsL, the key enzyme for AQNO production, which structurally resembles class A flavoprotein monooxygenases such as p-hydroxybenzoate 3-hydroxylase (pHBH) and 3-hydroxybenzoate 6-hydroxylase. However, we found that unlike related enzymes, PqsL hydroxylates a primary aromatic amine group, and it does not use NAD(P)H as cosubstrate, but unexpectedly required reduced flavin as electron donor. We also observed that PqsL is active toward 2-aminobenzoylacetate (2-ABA), the central intermediate of the AQ pathway, and forms the unstable compound 2-hydroxylaminobenzoylacetate, which was preferred over 2-ABA as substrate of the downstream enzyme PqsBC. In vitro reconstitution of the PqsL/PqsBC reaction was feasible by using the FAD reductase HpaC, and we noted that the AQ:AQNO ratio is increased in an hpaC-deletion mutant of P. aeruginosa PAO1 compared with the ratio in the WT strain. A structural comparison with pHBH, the model enzyme of class A flavoprotein monooxygenases, revealed that structural features associated with NAD(P)H binding are missing in PqsL. Our study completes the AQNO biosynthetic pathway in P. aeruginosa, indicating that PqsL produces the unstable product 2-hydroxylaminobenzoylacetate from 2-ABA and depends on free reduced flavin as electron donor instead of NAD(P)H.
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Affiliation(s)
| | - Simon Ernst
- From the Institute for Molecular Microbiology and Biotechnology and
| | - Benny Danilo Belviso
- the Institute of Crystallography, Consiglio Nazionale delle Ricerche, 70126 Bari, Italy
| | - Nina Jagmann
- From the Institute for Molecular Microbiology and Biotechnology and
| | - Ulrich Hennecke
- Organic Chemistry Institute, University of Münster, D-48149 Münster, Germany and
| | - Susanne Fetzner
- From the Institute for Molecular Microbiology and Biotechnology and
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33
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Raynes JM, Young PG, Proft T, Williamson DA, Baker EN, Moreland NJ. Protein adhesins as vaccine antigens for Group A Streptococcus. Pathog Dis 2018; 76:4919728. [DOI: 10.1093/femspd/fty016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 03/01/2018] [Indexed: 12/20/2022] Open
Affiliation(s)
- J M Raynes
- School of Medical Sciences, The University of Auckland, 85 Park Road, Auckland 1023, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
| | - P G Young
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
- School of Biological Sciences, University of Auckland, 5 Symonds Street, Auckland 1010, New Zealand
| | - T Proft
- School of Medical Sciences, The University of Auckland, 85 Park Road, Auckland 1023, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
| | - D A Williamson
- Microbiological Diagnostic Unit Public Health Laboratory, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - E N Baker
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
- School of Biological Sciences, University of Auckland, 5 Symonds Street, Auckland 1010, New Zealand
| | - N J Moreland
- School of Medical Sciences, The University of Auckland, 85 Park Road, Auckland 1023, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
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34
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Rollie C, Graham S, Rouillon C, White MF. Prespacer processing and specific integration in a Type I-A CRISPR system. Nucleic Acids Res 2018; 46:1007-1020. [PMID: 29228332 PMCID: PMC5815122 DOI: 10.1093/nar/gkx1232] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 11/22/2017] [Accepted: 11/29/2017] [Indexed: 12/15/2022] Open
Abstract
The CRISPR-Cas system for prokaryotic adaptive immunity provides RNA-mediated protection from viruses and mobile genetic elements. Adaptation is dependent on the Cas1 and Cas2 proteins along with varying accessory proteins. Here we analyse the process in Sulfolobus solfataricus, showing that while Cas1 and Cas2 catalyze spacer integration in vitro, host factors are required for specificity. Specific integration also requires at least 400 bp of the leader sequence, and is dependent on the presence of hydrolysable ATP, suggestive of an active process that may involve DNA remodelling. Specific spacer integration is associated with processing of prespacer 3' ends in a PAM-dependent manner. This is reflected in PAM-dependent processing of prespacer 3' ends in vitro in the presence of cell lysate or the Cas4 nuclease, in a reaction consistent with PAM-directed binding and protection of prespacer DNA. These results highlight the diverse interplay between CRISPR-Cas elements and host proteins across CRISPR types.
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Affiliation(s)
- Clare Rollie
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, UK
| | - Shirley Graham
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, UK
| | - Christophe Rouillon
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, UK
| | - Malcolm F White
- Biomedical Sciences Research Complex, School of Biology, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, UK
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35
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Dhusia K, Bajpai A, Ramteke PW. Overcoming antibiotic resistance: Is siderophore Trojan horse conjugation an answer to evolving resistance in microbial pathogens? J Control Release 2017; 269:63-87. [PMID: 29129658 DOI: 10.1016/j.jconrel.2017.11.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 10/30/2017] [Accepted: 11/01/2017] [Indexed: 01/11/2023]
Abstract
Comparative study of siderophore biosynthesis pathway in pathogens provides potential targets for antibiotics and host drug delivery as a part of computationally feasible microbial therapy. Iron acquisition using siderophore models is an essential and well established model in all microorganisms and microbial infections a known to cause great havoc to both plant and animal. Rapid development of antibiotic resistance in bacterial as well as fungal pathogens has drawn us at a verge where one has to get rid of the traditional way of obstructing pathogen using single or multiple antibiotic/chemical inhibitors or drugs. 'Trojan horse' strategy is an answer to this imperative call where antibiotic are by far sneaked into the pathogenic cell via the siderophore receptors at cell and outer membrane. This antibiotic once gets inside, generates a 'black hole' scenario within the opportunistic pathogens via iron scarcity. For pathogens whose siderophore are not compatible to smuggle drug due to their complex conformation and stiff valence bonds, there is another approach. By means of the siderophore biosynthesis pathways, potential targets for inhibition of these siderophores in pathogenic bacteria could be achieved and thus control pathogenic virulence. Method to design artificial exogenous siderophores for pathogens that would compete and succeed the battle of intake is also covered with this review. These manipulated siderophore would enter pathogenic cell like any other siderophore but will not disperse iron due to which iron inadequacy and hence pathogens control be accomplished. The aim of this review is to offer strategies to overcome the microbial infections/pathogens using siderophore.
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Affiliation(s)
- Kalyani Dhusia
- Deptartment of Computational Biology and Bioinformatics, Jacob Institute of Biotechnology and Bio-Engineering, Sam Higginbottom University of Agriculture, Technology and Sciences (SHUATS), Allahabad-211007 (U.P.), India
| | - Archana Bajpai
- Laboratory for Disease Systems Modeling, Center for Integrative Medical Sciences, RIKEN, Yokohama City, Kanagawa, 230-0045, Japan
| | - P W Ramteke
- Deptartment of Computational Biology and Bioinformatics, Jacob Institute of Biotechnology and Bio-Engineering, Sam Higginbottom University of Agriculture, Technology and Sciences (SHUATS), Allahabad-211007 (U.P.), India
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36
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Characterization of a dual function macrocyclase enables design and use of efficient macrocyclization substrates. Nat Commun 2017; 8:1045. [PMID: 29051530 PMCID: PMC5648786 DOI: 10.1038/s41467-017-00862-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 08/02/2017] [Indexed: 01/30/2023] Open
Abstract
Peptide macrocycles are promising therapeutic molecules because they are protease resistant, structurally rigid, membrane permeable, and capable of modulating protein-protein interactions. Here, we report the characterization of the dual function macrocyclase-peptidase enzyme involved in the biosynthesis of the highly toxic amanitin toxin family of macrocycles. The enzyme first removes 10 residues from the N-terminus of a 35-residue substrate. Conformational trapping of the 25 amino-acid peptide forces the enzyme to release this intermediate rather than proceed to macrocyclization. The enzyme rebinds the 25 amino-acid peptide in a different conformation and catalyzes macrocyclization of the N-terminal eight residues. Structures of the enzyme bound to both substrates and biophysical analysis characterize the different binding modes rationalizing the mechanism. Using these insights simpler substrates with only five C-terminal residues were designed, allowing the enzyme to be more effectively exploited in biotechnology.
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37
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Kudryavtseva AA, Osetrova MS, Livinyuk VY, Manukhov IV, Zavilgelsky GB. The importance of C-terminal aspartic acid residue (D141) to the antirestriction activity of the ArdB (R64) protein. Mol Biol 2017. [DOI: 10.1134/s0026893317050119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Comparison and analysis of the structures and binding modes of antifungal SE and CYP51 inhibitors. J Mol Graph Model 2017; 77:1-8. [DOI: 10.1016/j.jmgm.2017.07.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 07/28/2017] [Accepted: 07/30/2017] [Indexed: 11/15/2022]
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39
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Carroll CS, Grieve CL, Murugathasan I, Bennet AJ, Czekster CM, Liu H, Naismith J, Moore MM. The rhizoferrin biosynthetic gene in the fungal pathogen Rhizopus delemar is a novel member of the NIS gene family. Int J Biochem Cell Biol 2017; 89:136-146. [DOI: 10.1016/j.biocel.2017.06.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Revised: 05/30/2017] [Accepted: 06/03/2017] [Indexed: 11/29/2022]
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40
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Peeters E, Boon M, Rollie C, Willaert RG, Voet M, White MF, Prangishvili D, Lavigne R, Quax TEF. DNA-Interacting Characteristics of the Archaeal Rudiviral Protein SIRV2_Gp1. Viruses 2017; 9:v9070190. [PMID: 28718834 PMCID: PMC5537682 DOI: 10.3390/v9070190] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 07/06/2017] [Accepted: 07/10/2017] [Indexed: 12/02/2022] Open
Abstract
Whereas the infection cycles of many bacterial and eukaryotic viruses have been characterized in detail, those of archaeal viruses remain largely unexplored. Recently, studies on a few model archaeal viruses such as SIRV2 (Sulfolobus islandicus rod-shaped virus) have revealed an unusual lysis mechanism that involves the formation of pyramidal egress structures on the host cell surface. To expand understanding of the infection cycle of SIRV2, we aimed to functionally characterize gp1, which is a SIRV2 gene with unknown function. The SIRV2_Gp1 protein is highly expressed during early stages of infection and it is the only protein that is encoded twice on the viral genome. It harbours a helix-turn-helix motif and was therefore hypothesized to bind DNA. The DNA-binding behavior of SIRV2_Gp1 was characterized with electrophoretic mobility shift assays and atomic force microscopy. We provide evidence that the protein interacts with DNA and that it forms large aggregates, thereby causing extreme condensation of the DNA. Furthermore, the N-terminal domain of the protein mediates toxicity to the viral host Sulfolobus. Our findings may lead to biotechnological applications, such as the development of a toxic peptide for the containment of pathogenic bacteria, and add to our understanding of the Rudiviral infection cycle.
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Affiliation(s)
- Eveline Peeters
- Research Group of Microbiology, Department of Bio-Engineering Sciences, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium.
| | - Maarten Boon
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21 box 2462, Heverlee, 3001 Leuven, Belgium.
| | - Clare Rollie
- Biomedical Sciences Research Complex, University of St Andrews, Fife, North Haugh, St. Andrews KY16 9AJ, UK.
| | - Ronnie G Willaert
- Alliance Research Group VUB-UGhent NanoMicrobiology, IJRG VUB-EPFL, BioNanotechnology & NanoMedicine, Research Group Structural Biology Brussels, Department of Bio-Engineering Sciences, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium.
| | - Marleen Voet
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21 box 2462, Heverlee, 3001 Leuven, Belgium.
| | - Malcolm F White
- Biomedical Sciences Research Complex, University of St Andrews, Fife, North Haugh, St. Andrews KY16 9AJ, UK.
| | | | - Rob Lavigne
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21 box 2462, Heverlee, 3001 Leuven, Belgium.
| | - Tessa E F Quax
- Laboratory of Gene Technology, Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21 box 2462, Heverlee, 3001 Leuven, Belgium.
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Probing the potential of CnaB-type domains for the design of tag/catcher systems. PLoS One 2017; 12:e0179740. [PMID: 28654665 PMCID: PMC5487036 DOI: 10.1371/journal.pone.0179740] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Accepted: 06/02/2017] [Indexed: 01/06/2023] Open
Abstract
Building proteins into larger, post-translational assemblies in a defined and stable way is still a challenging task. A promising approach relies on so-called tag/catcher systems that are fused to the proteins of interest and allow a durable linkage via covalent intermolecular bonds. Tags and catchers are generated by splitting protein domains that contain intramolecular isopeptide or ester bonds that form autocatalytically under physiological conditions. There are already numerous biotechnological and medical applications that demonstrate the usefulness of covalent linkages mediated by these systems. Additional covalent tag/catcher systems would allow creating more complex and ultra-stable protein architectures and networks. Two of the presently available tag/catcher systems were derived from closely related CnaB-domains of Streptococcus pyogenes and Streptococcus dysgalactiae proteins. However, it is unclear whether domain splitting is generally tolerated within the CnaB-family or only by a small subset of these domains. To address this point, we have selected a set of four CnaB domains of low sequence similarity and characterized the resulting tag/catcher systems by computational and experimental methods. Experimental testing for intermolecular isopeptide bond formation demonstrated two of the four systems to be functional. For these two systems length and sequence variations of the peptide tags were investigated revealing only a relatively small effect on the efficiency of the reaction. Our study suggests that splitting into tag and catcher moieties is tolerated by a significant portion of the naturally occurring CnaB-domains, thus providing a large reservoir for the design of novel tag/catcher systems.
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Abstract
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Prolyl
oligopeptidase B from Galerina marginata (GmPOPB)
has recently been discovered as a peptidase capable of
breaking and forming peptide bonds to yield a cyclic peptide. Despite
the relevance of prolyl oligopeptidases in human biology and disease,
a kinetic analysis pinpointing rate-limiting steps for a member of
this enzyme family is not available. Macrocyclase enzymes are currently
exploited to produce cyclic peptides with potential therapeutic applications.
Cyclic peptides are promising druglike molecules because of their
stability and conformational rigidity. Here we describe an in-depth
kinetic characterization of a prolyl oligopeptidase acting as a macrocyclase
enzyme. By combining steady-state and pre-steady-state kinetics, we
propose a kinetic sequence in which a step after macrocyclization
limits steady-state turnover. Additionally, product release is ordered,
where the cyclic peptide departs first followed by the peptide tail.
Dissociation of the peptide tail is slow and significantly contributes
to the turnover rate. Furthermore, trapping of the enzyme by the peptide
tail becomes significant beyond initial rate conditions. The presence
of a burst of product formation and a large viscosity effect further
support the rate-limiting nature of a physical step occurring after
macrocyclization. This is the first detailed description of the kinetic
sequence of a macrocyclase enzyme from this class. GmPOPB is among
the fastest macrocyclases described to date, and this work is a necessary
step toward designing broad-specificity efficient macrocyclases.
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Affiliation(s)
- Clarissa M Czekster
- School of Chemistry, Biomedical Sciences Research Complex, University of St Andrews , North Haugh, St Andrews K16 9ST, U.K
| | - James H Naismith
- School of Chemistry, Biomedical Sciences Research Complex, University of St Andrews , North Haugh, St Andrews K16 9ST, U.K.,Biotherapy Centre, Sichuan University , Chengdu, China
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Stroek R, Ge Y, Talbot PD, Glok MK, Bernaś KE, Thomson CM, Gould ER, Alphey MS, Liu H, Florence GJ, Naismith JH, da Silva RG. Kinetics and Structure of a Cold-Adapted Hetero-Octameric ATP Phosphoribosyltransferase. Biochemistry 2017; 56:793-803. [PMID: 28092443 DOI: 10.1021/acs.biochem.6b01138] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Adenosine 5'-triphosphate phosphoribosyltransferase (ATPPRT) catalyzes the first step in histidine biosynthesis, the condensation of ATP and 5-phospho-α-d-ribosyl-1-pyrophosphate to generate N1-(5-phospho-β-d-ribosyl)-ATP and inorganic pyrophosphate. The enzyme is allosterically inhibited by histidine. Two forms of ATPPRT, encoded by the hisG gene, exist in nature, depending on the species. The long form, HisGL, is a single polypeptide chain with catalytic and regulatory domains. The short form, HisGS, lacks a regulatory domain and cannot bind histidine. HisGS instead is found in complex with a regulatory protein, HisZ, constituting the ATPPRT holoenzyme. HisZ triggers HisGS catalytic activity while rendering it sensitive to allosteric inhibition by histidine. Until recently, HisGS was thought to be catalytically inactive without HisZ. Here, recombinant HisGS and HisZ from the psychrophilic bacterium Psychrobacter arcticus were independently overexpressed and purified. The crystal structure of P. arcticus ATPPRT was determined at 2.34 Å resolution, revealing an equimolar HisGS-HisZ hetero-octamer. Steady-state kinetics indicate that both the ATPPRT holoenzyme and HisGS are catalytically active. Surprisingly, HisZ confers only a modest 2-4-fold increase in kcat. Reaction profiles for both enzymes cannot be distinguished by 31P nuclear magnetic resonance, indicating that the same reaction is catalyzed. The temperature dependence of kcat shows deviation from Arrhenius behavior at 308 K with the holoenzyme. Interestingly, such deviation is detected only at 313 K with HisGS. Thermal denaturation by CD spectroscopy resulted in Tm's of 312 and 316 K for HisZ and HisGS, respectively, suggesting that HisZ renders the ATPPRT complex more thermolabile. This is the first characterization of a psychrophilic ATPPRT.
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Affiliation(s)
- Rozanne Stroek
- School of Engineering and Applied Science, Rotterdam University of Applied Science , G. J. de Jonghweg 4-6, 3015 GG Rotterdam, The Netherlands
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44
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Lee JY, Jeong MC, Jeon D, Lee Y, Lee WC, Kim Y. Structure-activity relationship-based screening of antibiotics against Gram-negative Acinetobacter baumannii. Bioorg Med Chem 2016; 25:372-380. [PMID: 27840136 DOI: 10.1016/j.bmc.2016.11.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 10/31/2016] [Accepted: 11/01/2016] [Indexed: 12/25/2022]
Abstract
To discover potent antibiotics against the Gram-negative bacteria, we performed a structure-activity relationship (SAR) study of YKsa-6, which was the most potent inhibitor of Staphylococcus aureus β-ketoacyl acyl carrier protein III in our previous study. We identified and selected 11 candidates, and finally screened two active compounds, YKab-4 (4-[(3-chloro-4-methylphenyl)aminoiminomethyl]benzene-1,3-diol) and YKab-6 (4-[[3-(trifluoromethyl)phenyl]aminoiminomethyl]phenol) as inhibitors of Acinetobacter baumannii KAS III (abKAS III). They showed potent antimicrobial activities at 2 or 8 μg/mL, specifically against Acinetobacter baumannii and a strong binding affinity for abKAS III. From the homology modeling, we defined the three-dimensional (3D) structure of abKAS III for the first time and found that it had an extra loop region compared with common Gram-negative bacteria derived KAS IIIs. The docking study revealed that the hydroxyl groups of inhibitors formed extensive hydrogen bonds and the complicated hydrophobic and cation-stacking interactions are important to binding with abKAS III. We confirmed that the hydrophobicity of these compounds might be the essential factor for their antimicrobial activities against Gram-negative bacteria as well as their structural rigidity, a cooperative feature for retaining the hydrophobic interactions between abKAS III and its inhibitors. This study may provide an insight developing strategies for potent antibiotics against A. baumannii.
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Affiliation(s)
- Jee-Young Lee
- In silico Molecular Design Team, Chemical Occasion by Modeling Alchemy (CheOMA), Anyang-si 14067, Republic of Korea
| | - Min-Cheol Jeong
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Republic of Korea
| | - Dasom Jeon
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Republic of Korea
| | - Yeongjun Lee
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Republic of Korea
| | - Woo Cheol Lee
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Republic of Korea
| | - Yangmee Kim
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Republic of Korea.
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Tan LL, Hoon SS, Wong FT. Kinetic Controlled Tag-Catcher Interactions for Directed Covalent Protein Assembly. PLoS One 2016; 11:e0165074. [PMID: 27783674 PMCID: PMC5082641 DOI: 10.1371/journal.pone.0165074] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Accepted: 10/05/2016] [Indexed: 12/15/2022] Open
Abstract
Over the last few years, a number of different protein assembly strategies have been developed, greatly expanding the toolbox for controlling macromolecular assembly. One of the most promising developments is a rapid protein ligation approach using a short polypeptide SpyTag and its partner, SpyCatcher derived from Streptococcus pyogenes fibronectin-binding protein, FbaB. To extend this technology, we have engineered and characterized a new Tag-Catcher pair from a related fibronectin-binding protein in Streptococcus dysgalactiae. The polypeptide Tag, named SdyTag, was constructed based on the native Cna protein B-type (CnaB) domain and was found to be highly unreactive to SpyCatcher. SpyCatcher has 320-fold specificity for its native SpyTag compared to SdyTag. Similarly, SdyTag has a 75-fold specificity for its optimized Catcher, named SdyCatcherDANG short, compared to SpyCatcher. These Tag-Catcher pairs were used in combination to demonstrate specific sequential assembly of tagged proteins in vitro. We also demonstrated that the in vivo generation of circularized proteins in a Tag-Catcher specific manner where specific Tags can be left unreacted for use in subsequent ligation reactions. From the success of these experiments, we foresee the application of SdyTags and SpyTags, not only, for multiplexed control of protein assembly but also for the construction of novel protein architectures.
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Affiliation(s)
- Lee Ling Tan
- Molecular Engineering Lab, Biomedical Sciences Institutes, Biopolis Drive, Singapore, Singapore
| | - Shawn S. Hoon
- Molecular Engineering Lab, Biomedical Sciences Institutes, Biopolis Drive, Singapore, Singapore
| | - Fong T. Wong
- Molecular Engineering Lab, Biomedical Sciences Institutes, Biopolis Drive, Singapore, Singapore
- * E-mail:
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Si M, Xu Q, Jiang L, Huang H. SpyTag/SpyCatcher Cyclization Enhances the Thermostability of Firefly Luciferase. PLoS One 2016; 11:e0162318. [PMID: 27658030 DOI: 10.1371/journal.pone.0162318.g001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Accepted: 08/19/2016] [Indexed: 05/26/2023] Open
Abstract
SpyTag can spontaneously form a covalent isopeptide bond with its protein partner SpyCatcher. Firefly luciferase from Photinus pyralis was cyclized in vivo by fusing SpyCatcher at the N terminus and SpyTag at the C terminus. Circular LUC was more thermostable and alkali-tolerant than the wild type, without compromising the specific activity. Structural analysis indicated that the cyclized LUC increased the thermodynamic stability of the structure and remained more properly folded at high temperatures when compared with the wild type. We also prepared an N-terminally and C-terminally shortened form of the SpyCatcher protein and cyclization using this truncated form led to even more thermostability than the original form. Our findings suggest that cyclization with SpyTag and SpyCatcher is a promising and effective strategy to enhance thermostability of enzymes.
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Affiliation(s)
- Meng Si
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Qing Xu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, China
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Ling Jiang
- College of Food Sciences and Light Industry, Nanjing Tech University, Nanjing, 211816, China
| | - He Huang
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, China
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing, 211816, China
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47
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Si M, Xu Q, Jiang L, Huang H. SpyTag/SpyCatcher Cyclization Enhances the Thermostability of Firefly Luciferase. PLoS One 2016; 11:e0162318. [PMID: 27658030 PMCID: PMC5033358 DOI: 10.1371/journal.pone.0162318] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Accepted: 08/19/2016] [Indexed: 12/14/2022] Open
Abstract
SpyTag can spontaneously form a covalent isopeptide bond with its protein partner SpyCatcher. Firefly luciferase from Photinus pyralis was cyclized in vivo by fusing SpyCatcher at the N terminus and SpyTag at the C terminus. Circular LUC was more thermostable and alkali-tolerant than the wild type, without compromising the specific activity. Structural analysis indicated that the cyclized LUC increased the thermodynamic stability of the structure and remained more properly folded at high temperatures when compared with the wild type. We also prepared an N-terminally and C-terminally shortened form of the SpyCatcher protein and cyclization using this truncated form led to even more thermostability than the original form. Our findings suggest that cyclization with SpyTag and SpyCatcher is a promising and effective strategy to enhance thermostability of enzymes.
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Affiliation(s)
- Meng Si
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Qing Xu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, China
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Ling Jiang
- College of Food Sciences and Light Industry, Nanjing Tech University, Nanjing, 211816, China
- * E-mail: (LJ); (HH)
| | - He Huang
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, China
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing, 211816, China
- * E-mail: (LJ); (HH)
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48
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Chaurasia P, Pratap S, von Ossowski I, Palva A, Krishnan V. New insights about pilus formation in gut-adapted Lactobacillus rhamnosus GG from the crystal structure of the SpaA backbone-pilin subunit. Sci Rep 2016; 6:28664. [PMID: 27349405 PMCID: PMC4923907 DOI: 10.1038/srep28664] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 06/08/2016] [Indexed: 12/11/2022] Open
Abstract
Thus far, all solved structures of pilin-proteins comprising sortase-assembled pili are from pathogenic genera and species. Here, we present the first crystal structure of a pilin subunit (SpaA) from a non-pathogen host (Lactobacillus rhamnosus GG). SpaA consists of two tandem CnaB-type domains, each with an isopeptide bond and E-box motif. Intriguingly, while the isopeptide bond in the N-terminal domain forms between lysine and asparagine, the one in the C-terminal domain atypically involves aspartate. We also solved crystal structures of mutant proteins where residues implicated in forming isopeptide bonds were replaced. Expectedly, the E-box-substituted E139A mutant lacks an isopeptide bond in the N-terminal domain. However, the C-terminal E269A substitution gave two structures; one of both domains with their isopeptide bonds present, and another of only the N-terminal domain, but with an unformed isopeptide bond and significant conformational changes. This latter crystal structure has never been observed for any other Gram-positive pilin. Notably, the C-terminal isopeptide bond still forms in D295N-substituted SpaA, irrespective of E269 being present or absent. Although E-box mutations affect SpaA proteolytic and thermal stability, a cumulative effect perturbing normal pilus polymerization was unobserved. A model showing the polymerized arrangement of SpaA within the SpaCBA pilus is proposed.
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Affiliation(s)
- Priyanka Chaurasia
- Regional Centre for Biotechnology, NCR Biotech Science Cluster, Faridabad-121 001, India.,Department of Biotechnology, Manipal University, Karnataka, 576104, India
| | - Shivendra Pratap
- Regional Centre for Biotechnology, NCR Biotech Science Cluster, Faridabad-121 001, India
| | | | - Airi Palva
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
| | - Vengadesan Krishnan
- Regional Centre for Biotechnology, NCR Biotech Science Cluster, Faridabad-121 001, India
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49
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Zhang J, Graham S, Tello A, Liu H, White MF. Multiple nucleic acid cleavage modes in divergent type III CRISPR systems. Nucleic Acids Res 2016; 44:1789-99. [PMID: 26801642 PMCID: PMC4770243 DOI: 10.1093/nar/gkw020] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 12/14/2015] [Accepted: 01/07/2016] [Indexed: 12/26/2022] Open
Abstract
CRISPR-Cas is an RNA-guided adaptive immune system that protects bacteria and archaea from invading nucleic acids. Type III systems (Cmr, Csm) have been shown to cleave RNA targets in vitro and some are capable of transcription-dependent DNA targeting. The crenarchaeon Sulfolobus solfataricus has two divergent subtypes of the type III system (Sso-IIID and a Cmr7-containing variant of Sso-IIIB). Here, we report that both the Sso-IIID and Sso-IIIB complexes cleave cognate RNA targets with a ruler mechanism and 6 or 12 nt spacing that relates to the organization of the Cas7 backbone. This backbone-mediated cleavage activity thus appears universal for the type III systems. The Sso-IIIB complex is also known to possess a distinct 'UA' cleavage mode. The predominant activity observed in vitro depends on the relative molar concentration of protein and target RNA. The Sso-IIID complex can cleave plasmid DNA targets in vitro, generating linear DNA products with an activity that is dependent on both the cyclase and HD nuclease domains of the Cas10 subunit, suggesting a role for both nuclease active sites in the degradation of double-stranded DNA targets.
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Affiliation(s)
- Jing Zhang
- Biomedical Sciences Research Complex, University of St Andrews, Fife KY16 9ST, UK
| | - Shirley Graham
- Biomedical Sciences Research Complex, University of St Andrews, Fife KY16 9ST, UK
| | - Agnes Tello
- Biomedical Sciences Research Complex, University of St Andrews, Fife KY16 9ST, UK
| | - Huanting Liu
- Biomedical Sciences Research Complex, University of St Andrews, Fife KY16 9ST, UK
| | - Malcolm F White
- Biomedical Sciences Research Complex, University of St Andrews, Fife KY16 9ST, UK
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