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Clausse V, Tao D, Debnath S, Fang Y, Tagad HD, Wang Y, Sun H, LeClair CA, Mazur SJ, Lane K, Shi ZD, Vasalatiy O, Eells R, Baker LK, Henderson MJ, Webb MR, Shen M, Hall MD, Appella E, Appella DH, Coussens NP. Physiologically relevant orthogonal assays for the discovery of small-molecule modulators of WIP1 phosphatase in high-throughput screens. J Biol Chem 2019; 294:17654-17668. [PMID: 31481464 PMCID: PMC6873202 DOI: 10.1074/jbc.ra119.010201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/30/2019] [Indexed: 01/07/2023] Open
Abstract
WT P53-Induced Phosphatase 1 (WIP1) is a member of the magnesium-dependent serine/threonine protein phosphatase (PPM) family and is induced by P53 in response to DNA damage. In several human cancers, the WIP1 protein is overexpressed, which is generally associated with a worse prognosis. Although WIP1 is an attractive therapeutic target, no potent, selective, and bioactive small-molecule modulator with favorable pharmacokinetics has been reported. Phosphatase enzymes are among the most challenging targets for small molecules because of the difficulty of achieving both modulator selectivity and bioavailability. Another major obstacle has been the availability of robust and physiologically relevant phosphatase assays that are suitable for high-throughput screening. Here, we describe orthogonal biochemical WIP1 activity assays that utilize phosphopeptides from native WIP1 substrates. We optimized an MS assay to quantify the enzymatically dephosphorylated peptide reaction product in a 384-well format. Additionally, a red-shifted fluorescence assay was optimized in a 1,536-well format to enable real-time WIP1 activity measurements through the detection of the orthogonal reaction product, Pi. We validated these two optimized assays by quantitative high-throughput screening against the National Center for Advancing Translational Sciences (NCATS) Pharmaceutical Collection and used secondary assays to confirm and evaluate inhibitors identified in the primary screen. Five inhibitors were further tested with an orthogonal WIP1 activity assay and surface plasmon resonance binding studies. Our results validate the application of miniaturized physiologically relevant and orthogonal WIP1 activity assays to discover small-molecule modulators from high-throughput screens.
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Affiliation(s)
- Victor Clausse
- Synthetic Bioactive Molecules Section, Laboratory of Bioorganic Chemistry, NIDDK, National Institutes of Health, Bethesda, Maryland 20892
| | - Dingyin Tao
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Subrata Debnath
- Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Yuhong Fang
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Harichandra D Tagad
- Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Yuhong Wang
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Hongmao Sun
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Christopher A LeClair
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Sharlyn J Mazur
- Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Kelly Lane
- Imaging Probe Development Center, NHLBI, National Institutes of Health, Rockville, Maryland 20850
| | - Zhen-Dan Shi
- Imaging Probe Development Center, NHLBI, National Institutes of Health, Rockville, Maryland 20850
| | - Olga Vasalatiy
- Imaging Probe Development Center, NHLBI, National Institutes of Health, Rockville, Maryland 20850
| | - Rebecca Eells
- Reaction Biology Corporation, 1 Great Valley Parkway, Suite 2, Malvern, Pennsylvania 19355
| | - Lynn K Baker
- Reaction Biology Corporation, 1 Great Valley Parkway, Suite 2, Malvern, Pennsylvania 19355
| | - Mark J Henderson
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Martin R Webb
- Francis Crick Institute, 1 Midland Road, London NW1 AT, United Kingdom
| | - Min Shen
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Matthew D Hall
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Ettore Appella
- Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Daniel H Appella
- Synthetic Bioactive Molecules Section, Laboratory of Bioorganic Chemistry, NIDDK, National Institutes of Health, Bethesda, Maryland 20892
| | - Nathan P Coussens
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
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2
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Hegedüs É, Kókai E, Nánási P, Imre L, Halász L, Jossé R, Antunovics Z, Webb MR, El Hage A, Pommier Y, Székvölgyi L, Dombrádi V, Szabó G. Endogenous single-strand DNA breaks at RNA polymerase II promoters in Saccharomyces cerevisiae. Nucleic Acids Res 2019; 46:10649-10668. [PMID: 30445637 PMCID: PMC6237785 DOI: 10.1093/nar/gky743] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 08/16/2018] [Indexed: 12/12/2022] Open
Abstract
Molecular combing and gel electrophoretic studies revealed endogenous nicks with free 3'OH ends at ∼100 kb intervals in the genomic DNA (gDNA) of unperturbed and G1-synchronized Saccharomyces cerevisiae cells. Analysis of the distribution of endogenous nicks by Nick ChIP-chip indicated that these breaks accumulated at active RNA polymerase II (RNAP II) promoters, reminiscent of the promoter-proximal transient DNA breaks of higher eukaryotes. Similar periodicity of endogenous nicks was found within the ribosomal rDNA cluster, involving every ∼10th of the tandemly repeated 9.1 kb units of identical sequence. Nicks were mapped by Southern blotting to a few narrow regions within the affected units. Three of them were overlapping the RNAP II promoters, while the ARS-containing IGS2 region was spared of nicks. By using a highly sensitive reverse-Southwestern blot method to map free DNA ends with 3'OH, nicks were shown to be distinct from other known rDNA breaks and linked to the regulation of rDNA silencing. Nicks in rDNA and the rest of the genome were typically found at the ends of combed DNA molecules, occasionally together with R-loops, comprising a major pool of vulnerable sites that are connected with transcriptional regulation.
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Affiliation(s)
- Éva Hegedüs
- Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Endre Kókai
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Péter Nánási
- Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - László Imre
- Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - László Halász
- MTA-DE Momentum Genome Architecture and Recombination Research Group, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Rozenn Jossé
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute (CCR-NCI), NIH, Bethesda, MD, USA
| | - Zsuzsa Antunovics
- Department of Genetics and Applied Microbiology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | | | - Aziz El Hage
- Wellcome Trust Centre for Cell Biology, University of Edinburgh, Edinburgh, UK
| | - Yves Pommier
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute (CCR-NCI), NIH, Bethesda, MD, USA
| | - Lóránt Székvölgyi
- Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.,MTA-DE Momentum Genome Architecture and Recombination Research Group, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Viktor Dombrádi
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Gábor Szabó
- Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
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Chisty LT, Quaglia D, Webb MR. Fluorescent single-stranded DNA-binding protein from Plasmodium falciparum as a biosensor for single-stranded DNA. PLoS One 2018; 13:e0193272. [PMID: 29466468 PMCID: PMC5821389 DOI: 10.1371/journal.pone.0193272] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 02/07/2018] [Indexed: 11/30/2022] Open
Abstract
Single-stranded DNA (ssDNA) is a product of many cellular processes that involve double-stranded DNA, for example during DNA replication and repair, and is formed transiently in many others. Measurement of ssDNA formation is fundamental for understanding many such processes. The availability of a fluorescent biosensor for the determination of single-stranded DNA provides an important route to achieve this. Single-stranded DNA binding proteins (SSBs) protect ssDNA from degradation, but can be displaced to allow processing of the ssDNA. Their tight binding of ssDNA means that they are very good candidates for the development of a biosensor. Previously, the single stranded DNA binding protein from Escherichia coli, labeled with a fluorophore, (DCC-EcSSB) was developed and used for this purpose. However, the multiple binding modes of this protein meant that interpretation of DCC-EcSSB fluorescence was potentially complex in terms of determining the amount of ssDNA. Here, we present an improved biosensor, developed using the tetrameric SSB from Plasmodium falciparum as a new scaffold for fluorophore attachment. Each subunit of this tetrameric SSB was labeled with a diethylaminocoumarin fluorophore at a single site on its surface, such that there is a very large, 20-fold, fluorescence increase when it binds to ssDNA. This adduct can be used as a biosensor to report ssDNA formation. Because SSB from this organism has a single mode of binding ssDNA, namely 65-70 bases per tetramer, over a wide range of conditions, the fluorescent SSB allows simple quantitation of ssDNA. The binding is fast, possibly diffusion controlled, and tight (dissociation constant for DCC-PfSSB <5 pM). Its suitability for real-time assays of ssDNA formation was demonstrated by measurement of AddAB helicase activity, unwinding double-stranded DNA.
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Abstract
Bacterial antibiotic resistance is often carried by circular DNA plasmids that are copied separately from the genomic DNA and can be passed to other bacteria, spreading the resistance. The chloramphenicol-resistance plasmid pC221 from Staphylococcus aureus is duplicated by a process called asymmetric rolling circle replication. It is not fully understood how the replication process is regulated but its initiation requires a plasmid-encoded protein called RepD that nicks one strand of the parent plasmid at the double-stranded origin of replication (oriD). Using magnetic tweezers to control the DNA linking number we found RepD nicking occurred only when DNA was negatively supercoiled and that binding of a non-nicking mutant (RepDY188F) stabilized secondary structure formation at oriD. Quenched-flow experiments showed the inverted complementary repeat sequence, ICRII, within oriD was most important for rapid nicking of intact plasmids. Our results show that cruciform formation at oriD is an important control for initiation of plasmid replication.
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Affiliation(s)
- Algirdas Toleikis
- The Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
- WMS - Cell and Development Biology, University of Warwick, Coventry, CV4 7AL, UK
| | - Martin R Webb
- The Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
| | - Justin E Molloy
- The Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK.
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Vancraenenbroeck R, Kunzelmann S, Webb MR. Development of a range of fluorescent reagentless biosensors for ATP, based on malonyl-coenzyme A synthetase. PLoS One 2017; 12:e0179547. [PMID: 28636641 PMCID: PMC5479551 DOI: 10.1371/journal.pone.0179547] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 05/31/2017] [Indexed: 01/15/2023] Open
Abstract
The range of ATP concentrations that can be measured with a fluorescent reagentless biosensor for ATP has been increased by modulating its affinity for this analyte. The ATP biosensor is an adduct of two tetramethylrhodamines with MatB from Rhodopseudomonas palustris. Mutations were introduced into the binding site to modify ATP binding affinity, while aiming to maintain the concomitant fluorescence signal. Using this signal, the effect of mutations in different parts of the binding site was measured. This mutational analysis revealed three variants in particular, each with a single mutation in the phosphate-binding loop, which had potentially beneficial changes in ATP binding properties but preserving a fluorescence change of ~3-fold on ATP binding. Two variants (T167A and T303A) weakened the binding, changing the dissociation constant from the parent's 6 μM to 123 μM and 42 μM, respectively. Kinetic measurements showed that the effect of these mutations on affinity was by an increase in dissociation rate constants. These variants widen the range of ATP concentration that can be measured readily by this biosensor to >100 μM. In contrast, a third variant, S170A, decreased the dissociation constant of ATP to 3.8 μM and has a fluorescence change of 4.2 on binding ATP. This variant has increased selectivity for ATP over ADP of >200-fold. This had advantages over the parent by increasing sensitivity as well as increasing selectivity during ATP measurements in which ADP is present.
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Affiliation(s)
| | - Simone Kunzelmann
- Structural Biology Science Technology Platform, The Francis Crick Institute, London, United Kingdom
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6
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Gu X, Yan Y, Novick SJ, Kovach A, Goswami D, Ke J, Tan MHE, Wang L, Li X, de Waal PW, Webb MR, Griffin PR, Xu HE, Melcher K. Deconvoluting AMP-activated protein kinase (AMPK) adenine nucleotide binding and sensing. J Biol Chem 2017; 292:12653-12666. [PMID: 28615457 PMCID: PMC5535039 DOI: 10.1074/jbc.m117.793018] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 05/31/2017] [Indexed: 12/16/2022] Open
Abstract
AMP-activated protein kinase (AMPK) is a central cellular energy sensor that adapts metabolism and growth to the energy state of the cell. AMPK senses the ratio of adenine nucleotides (adenylate energy charge) by competitive binding of AMP, ADP, and ATP to three sites (CBS1, CBS3, and CBS4) in its γ-subunit. Because these three binding sites are functionally interconnected, it remains unclear how nucleotides bind to individual sites, which nucleotides occupy each site under physiological conditions, and how binding to one site affects binding to the other sites. Here, we comprehensively analyze nucleotide binding to wild-type and mutant AMPK protein complexes by quantitative competition assays and by hydrogen-deuterium exchange MS. We also demonstrate that NADPH, in addition to the known AMPK ligand NADH, directly and competitively binds AMPK at the AMP-sensing CBS3 site. Our findings reveal how AMP binding to one site affects the conformation and adenine nucleotide binding at the other two sites and establish CBS3, and not CBS1, as the high affinity exchangeable AMP/ADP/ATP-binding site. We further show that AMP binding at CBS4 increases AMP binding at CBS3 by 2 orders of magnitude and reverses the AMP/ATP preference of CBS3. Together, these results illustrate how the three CBS sites collaborate to enable highly sensitive detection of cellular energy states to maintain the tight ATP homeostastis required for cellular metabolism.
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Affiliation(s)
- Xin Gu
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503
| | - Yan Yan
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503; VARI-SIMM Center, Center for Structure and Function of Drug Targets, The CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences (CAS), Shanghai 201203, China
| | - Scott J Novick
- Department of Molecular Medicine, Translational Research Institute, The Scripps Research Institute, Jupiter, Florida 33458
| | - Amanda Kovach
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503
| | - Devrishi Goswami
- Department of Molecular Medicine, Translational Research Institute, The Scripps Research Institute, Jupiter, Florida 33458
| | - Jiyuan Ke
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503
| | - M H Eileen Tan
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503; The Francis Crick Institute, 1 Midland Road, London NW1 1AT, United Kingdom
| | - Lili Wang
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503
| | - Xiaodan Li
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503
| | - Parker W de Waal
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503
| | - Martin R Webb
- The Francis Crick Institute, 1 Midland Road, London NW1 1AT, United Kingdom
| | - Patrick R Griffin
- Department of Molecular Medicine, Translational Research Institute, The Scripps Research Institute, Jupiter, Florida 33458
| | - H Eric Xu
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503; VARI-SIMM Center, Center for Structure and Function of Drug Targets, The CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences (CAS), Shanghai 201203, China
| | - Karsten Melcher
- Laboratories of Structural Sciences and Structural Biology and Biochemistry, Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan 49503.
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Abstract
![]()
A fluorescent reagentless biosensor
for ATP has been developed,
based on malonyl-coenzyme A synthetase from Rhodopseudomonas
palustris as the protein scaffold and recognition element.
Two 5-iodoacetamidotetramethylrhodamines were covalently bound to
this protein to provide the readout. This adduct couples ATP binding
to a 3.7-fold increase in fluorescence intensity with excitation at
553 nm and emission at 575 nm. It measures ATP concentrations with
micromolar sensitivity and is highly selective for ATP relative to
ADP. Its ability to monitor enzymatic ATP production or depletion
was demonstrated in steady-state kinetic assays in which ATP is a
product or substrate, respectively.
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Affiliation(s)
- Renée Vancraenenbroeck
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
| | - Martin R. Webb
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
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8
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Solscheid C, Kunzelmann S, Davis C, Hunter JL, Nofer A, Webb MR. Development of a Reagentless Biosensor for Inorganic Phosphate, Applicable over a Wide Concentration Range. Biochemistry 2015; 54:5054-62. [PMID: 26199994 PMCID: PMC4741387 DOI: 10.1021/acs.biochem.5b00449] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 07/22/2015] [Indexed: 11/30/2022]
Abstract
A fluorescent reagentless biosensor for inorganic phosphate (Pi), based on the E. coli PstS phosphate binding protein, was redesigned to allow measurements of higher Pi concentrations and at low, substoichiometric concentrations of biosensor. This was achieved by weakening Pi binding of the previous biosensor, and different approaches are described that could enable this change in properties. The readout, providing response to the Pi concentration, is delivered by tetramethylrhodamine fluorescence. In addition to two cysteine mutations for rhodamine labeling at positions 17 and 197, the final variant had an I76G mutation in the hinge region between the two lobes that make up the protein. Upon Pi binding, the lobes rotate on this hinge and the mutation on the hinge lowers affinity ∼200-fold, with a dissociation constant now in the tens to hundreds micromolar range, depending on solution conditions. The signal change on Pi binding was up to 9-fold, depending on pH. The suitability of the biosensor for steady-state ATPase assays was demonstrated with low biosensor usage and its advantage in ability to cope with Pi contamination.
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Affiliation(s)
- Claudia Solscheid
- The Francis Crick
Institute, Mill Hill Laboratory, The
Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
| | - Simone Kunzelmann
- The Francis Crick
Institute, Mill Hill Laboratory, The
Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
| | - Colin
T. Davis
- The Francis Crick
Institute, Mill Hill Laboratory, The
Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
| | - Jackie L. Hunter
- MRC National Institute
for Medical Research, Mill Hill, London NW7 1AA, United Kingdom
| | - Annie Nofer
- MRC National Institute
for Medical Research, Mill Hill, London NW7 1AA, United Kingdom
| | - Martin R. Webb
- The Francis Crick
Institute, Mill Hill Laboratory, The
Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
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10
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Toleikis A, Kunzelmann S, Mashanov GI, Webb MR, Molloy JE. Initiation of Asymmetric Rolling-Circle Plasmid Replication by RepD Studied using Magnetic Tweezers. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.2772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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11
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Rasheed M, Richter C, Chisty LT, Kirkpatrick J, Blackledge M, Webb MR, Driscoll PC. Ligand-dependent dynamics of the active-site lid in bacterial dimethylarginine dimethylaminohydrolase. Biochemistry 2014; 53:1092-104. [PMID: 24484052 PMCID: PMC3945819 DOI: 10.1021/bi4015924] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The dimethylarginine dimethylaminohydrolase (DDAH) enzyme family has been the subject of substantial investigation as a potential therapeutic target for the regulation of vascular tension. DDAH enzymes catalyze the conversion of asymmetric N(η),N(η)-dimethylarginine (ADMA) to l-citrulline. Here the influence of substrate and product binding on the dynamic flexibility of DDAH from Pseudomonas aeruginosa (PaDDAH) has been assessed. A combination of heteronuclear NMR spectroscopy, static and time-resolved fluorescence measurements, and atomistic molecular dynamics simulations was employed. A monodisperse monomeric variant of the wild-type enzyme binds the reaction product l-citrulline with a low millimolar dissociation constant. A second variant, engineered to be catalytically inactive by substitution of the nucleophilic Cys249 residue with serine, can still convert the substrate ADMA to products very slowly. This PaDDAH variant also binds l-citrulline, but with a low micromolar dissociation constant. NMR and molecular dynamics simulations indicate that the active site "lid", formed by residues Gly17-Asp27, exhibits a high degree of internal motion on the picosecond-to-nanosecond time scale. This suggests that the lid is open in the apo state and allows substrate access to the active site that is otherwise buried. l-Citrulline binding to both protein variants is accompanied by an ordering of the lid. Modification of PaDDAH with a coumarin fluorescence reporter allowed measurement of the kinetic mechanism of the PaDDAH reaction. A combination of NMR and kinetic data shows that the catalytic turnover of the enzyme is not limited by release of the l-citrulline product. The potential to develop the coumarin-PaDDAH adduct as an l-citrulline sensor is discussed.
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Affiliation(s)
- Masooma Rasheed
- Division of Molecular Structure and ‡Division of Physical Biochemistry, MRC National Institute for Medical Research , The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
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12
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Abstract
The superfamily 1 helicase, RecD2, is a monomeric, bacterial enzyme with a role in DNA repair, but with 5′-3′ activity unlike most enzymes from this superfamily. Rate constants were determined for steps within the ATPase cycle of RecD2 in the presence of ssDNA. The fluorescent ATP analog, mantATP (2′(3′)-O-(N-methylanthraniloyl)ATP), was used throughout to provide a complete set of rate constants and determine the mechanism of the cycle for a single nucleotide species. Fluorescence stopped-flow measurements were used to determine rate constants for adenosine nucleotide binding and release, quenched-flow measurements were used for the hydrolytic cleavage step, and the fluorescent phosphate biosensor was used for phosphate release kinetics. Some rate constants could also be measured using the natural substrate, ATP, and these suggested a similar mechanism to that obtained with mantATP. The data show that a rearrangement linked to Mg2+ coordination, which occurs before the hydrolysis step, is rate-limiting in the cycle and that this step is greatly accelerated by bound DNA. This is also shown here for the PcrA 3′-5′ helicase and so may be a general mechanism governing superfamily 1 helicases. The mechanism accounts for the tight coupling between translocation and ATPase activity.
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Affiliation(s)
- Christopher P Toseland
- From the MRC National Institute for Medical Research, Mill Hill, London, NW7 1AA, United Kingdom and; Institut für Zelluläre Physiologie and Center for NanoScience, Physiologisches Institut, Ludwig Maximilians Universität, Munich 80336, Germany
| | - Martin R Webb
- From the MRC National Institute for Medical Research, Mill Hill, London, NW7 1AA, United Kingdom and.
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Chisty LT, Toseland CP, Fili N, Mashanov GI, Dillingham MS, Molloy JE, Webb MR. Monomeric PcrA helicase processively unwinds plasmid lengths of DNA in the presence of the initiator protein RepD. Nucleic Acids Res 2013; 41:5010-23. [PMID: 23535146 PMCID: PMC3643603 DOI: 10.1093/nar/gkt194] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The helicase PcrA unwinds DNA during asymmetric replication of plasmids, acting with an initiator protein, in our case RepD. Detailed kinetics of PcrA activity were measured using bulk solution and a single-molecule imaging technique to investigate the oligomeric state of the active helicase complex, its processivity and the mechanism of unwinding. By tethering either DNA or PcrA to a microscope coverslip surface, unwinding of both linear and natural circular plasmid DNA by PcrA/RepD was followed in real-time using total internal reflection fluorescence microscopy. Visualization was achieved using a fluorescent single-stranded DNA-binding protein. The single-molecule data show that PcrA, in combination with RepD, can unwind plasmid lengths of DNA in a single run, and that PcrA is active as a monomer. Although the average rate of unwinding was similar in single-molecule and bulk solution assays, the single-molecule experiments revealed a wide distribution of unwinding speeds by different molecules. The average rate of unwinding was several-fold slower than the PcrA translocation rate on single-stranded DNA, suggesting that DNA unwinding may proceed via a partially passive mechanism. However, the fastest dsDNA unwinding rates measured in the single-molecule unwinding assays approached the PcrA translocation speed measured on ssDNA.
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Affiliation(s)
- Liisa T Chisty
- MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, UK
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Gonçalves MB, Dreyer J, Lupieri P, Barrera-Patiño C, Ippoliti E, Webb MR, Corrie JET, Carloni P. Structural prediction of a rhodamine-based biosensor and comparison with biophysical data. Phys Chem Chem Phys 2013; 15:2177-83. [DOI: 10.1039/c2cp42396k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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15
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Solscheid C, Webb MR. Development of Reagentless Fluorescent Biosensors for use in Rapid Kinetic Assays. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.2927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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16
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Lallemand P, Leban N, Kunzelmann S, Chaloin L, Serpersu EH, Webb MR, Barman T, Lionne C. Transient kinetics of aminoglycoside phosphotransferase(3')-IIIa reveals a potential drug target in the antibiotic resistance mechanism. FEBS Lett 2012; 586:4223-7. [PMID: 23108046 PMCID: PMC3510435 DOI: 10.1016/j.febslet.2012.10.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 10/11/2012] [Accepted: 10/12/2012] [Indexed: 11/24/2022]
Abstract
Aminoglycoside phosphotransferases are bacterial enzymes responsible for the inactivation of aminoglycoside antibiotics by O-phosphorylation. It is important to understand the mechanism of enzymes in order to find efficient drugs. Using rapid-mixing methods, we studied the transient kinetics of aminoglycoside phosphotransferase(3′)-IIIa. We show that an ADP-enzyme complex is the main steady state intermediate. This intermediate interacts strongly with kanamycin A to form an abortive complex that traps the enzyme in an inactive state. A good strategy to prevent the inactivation of aminoglycosides would be to develop uncompetitive inhibitors that interact with this key ADP-enzyme complex.
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Affiliation(s)
- Perrine Lallemand
- Centre d'études d'agents Pathogènes et Biotechnologies pour la Santé (CPBS), UMR 5236 CNRS, University Montpellier I & II, 1919 Route de Mende, 34293 Montpellier Cedex 5, France
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17
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Bianco PR, Webb MR. Helicase unwinding: active or merely perfect? J Mol Biol 2012; 420:139-40. [PMID: 22560995 PMCID: PMC5862422 DOI: 10.1016/j.jmb.2012.04.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Piero R Bianco
- Department of Microbiology and Immunology, Center for Single Molecule Biophysics, University at Buffalo, Buffalo, NY 14214, USA.
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18
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Abstract
The superfamily 2 bacterial helicase, RecG, is a monomeric enzyme with a role in DNA repair by reversing stalled replication forks. The helicase must act specifically and rapidly to prevent replication fork collapse. We have shown that RecG binds tightly and rapidly to four-strand oligonucleotide junctions, which mimic a stalled replication fork. The helicase unwinds such DNA junctions with a step-size of approximately four bases per ATP hydrolyzed. To gain an insight into this mechanism, we used fluorescent stopped-flow and quenched-flow to measure individual steps within the ATPase cycle of RecG, when bound to a DNA junction. The fluorescent ATP analogue, mantATP, was used throughout to determine the rate limiting steps, effects due to DNA and the main states in the cycle. Measurements, when possible, were also performed with unlabeled ATP to confirm the mechanism. The data show that the chemical step of hydrolysis is the rate limiting step in the cycle and that this step is greatly accelerated by bound DNA. The ADP release rate is similar to the cleavage rate, so that bound ATP and ADP would be the main states during the ATP cycle. Evidence is provided that the main structural rearrangements, which bring about DNA unwinding, are linked to these states.
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Affiliation(s)
| | - Ben Powell
- MRC National Institute for Medical Research, Mill Hill, London, United Kingdom
| | - Martin R. Webb
- MRC National Institute for Medical Research, Mill Hill, London, United Kingdom
- * E-mail: .
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19
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Abstract
Some bacterial plasmids carry antibiotic resistance genes and replicate by an asymmetric, rolling circle mechanism, in which replication of the two strands is not concurrent. Initiation of this replication occurs via an initiator protein that nicks one DNA strand at the double-stranded origin of replication. In this work, RepD protein from the staphylococcal plasmid pC221 carries this function and allows PcrA helicase to bind and begin unwinding the plasmid DNA. This work uses whole plasmid constructs as well as oligonucleotide-based mimics of parts of the origin to examine the initiation reaction. It investigates the phenomenon that nicking, although required to open a single-stranded region at the origin and so allow PcrA to bind, is not required for another function of RepD, namely to increase the processivity of PcrA, allowing it to unwind plasmid lengths of DNA. A kinetic mechanism of RepD initiation is presented, showing rapid binding of the origin DNA. The rate of nicking varies with the structure of the DNA but can occur with a rate constant of >25 s(-1) at 30 °C. The equilibrium constant of the nicking reaction, which involves a transesterification to form a phosphotyrosine bond within the RepD active site, is close to unity.
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Affiliation(s)
- Claudia Arbore
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK
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20
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Abstract
Helicases are an important and much studied group of enzymes that generally couple ATP hydrolysis to the separation of strands of base-paired nucleic acids. Studying their biochemistry at different levels of organization requires assays that measure the progress of the reaction in different ways. One such method makes use of the single-stranded DNA-binding protein (SSB) from Escherichia coli. This is used as a protein framework to produce a "reagentless biosensor," making use of its tight and specific binding of single-stranded DNA. The attachment of a fluorophore to this protein produces a signal in response to that binding. Thus the (G26C)SSB, labeled with a diethylaminocoumarin, gives a ~5-fold fluorescence increase on binding to single-stranded DNA and this can be used to assay the progress of helicase action along double-stranded DNA. A protocol for this is described along with a variant that can be used to follow the unwinding on a single molecule scale.
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21
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Kunzelmann S, Nofer A, Davis C, Webb MR. Fluorescent, Reagentless Biosensors for Phosphate: Altering Properties, Expanding Usefulness. Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.2546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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22
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Zhou R, Kunzelmann S, Webb MR, Ha T. Detecting intramolecular conformational dynamics of single molecules in short distance range with subnanometer sensitivity. Nano Lett 2011; 11:5482-8. [PMID: 22023515 PMCID: PMC3237907 DOI: 10.1021/nl2032876] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Single molecule detection is useful for characterizing nanoscale objects such as biological macromolecules, nanoparticles and nanodevices with nanometer spatial resolution. Fluorescence resonance energy transfer (FRET) is widely used as a single-molecule assay to monitor intramolecular dynamics in the distance range of 3-8 nm. Here we demonstrate that self-quenching of two rhodamine derivatives can be used to detect small conformational dynamics corresponding to subnanometer distance changes in a FRET-insensitive short-range at the single molecule level. A ParM protein mutant labeled with two rhodamines works as a single molecule adenosine 5'-diphosphate (ADP) sensor that has 20 times brighter fluorescence signal in the ADP bound state than the unbound state. Single molecule time trajectories show discrete transitions between fluorescence on and off states that can be directly ascribed to ADP binding and dissociation events. The conformational changes observed with 20:1 contrast are only 0.5 nm in magnitude and are between crystallographic distances of 1.6 and 2.1 nm, demonstrating exquisite sensitivity to short distance scale changes. The systems also allowed us to gain information on the photophysics of self-quenching induced by rhodamine stacking: (1) photobleaching of either of the two rhodamines eliminates quenching of the other rhodamine fluorophore and (2) photobleaching from the highly quenched, stacked state is only 2-fold slower than from the unstacked state.
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Affiliation(s)
- Ruobo Zhou
- Department of Physics and Center for the Physics of Living Cells, University of Illinois, Urbana-Champaign, Illinois 61801, United States
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23
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Bickham DC, West TG, Webb MR, Woledge RC, Curtin NA, Ferenczi MA. Millisecond-scale biochemical response to change in strain. Biophys J 2011; 101:2445-54. [PMID: 22098743 DOI: 10.1016/j.bpj.2011.10.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Revised: 09/02/2011] [Accepted: 10/12/2011] [Indexed: 11/25/2022] Open
Abstract
Muscle fiber contraction involves the cyclical interaction of myosin cross-bridges with actin filaments, linked to hydrolysis of ATP that provides the required energy. We show here the relationship between cross-bridge states, force generation, and Pi release during ramp stretches of active mammalian skeletal muscle fibers at 20°C. The results show that force and Pi release respond quickly to the application of stretch: force rises rapidly, whereas the rate of Pi release decreases abruptly and remains low for the duration of the stretch. These measurements show that biochemical change on the millisecond timescale accompanies the mechanical and structural responses in active muscle fibers. A cross-bridge model is used to simulate the effect of stretch on the distribution of actomyosin cross-bridges, force, and Pi release, with explicit inclusion of ATP, ADP, and Pi in the biochemical states and length-dependence of transitions. In the simulation, stretch causes rapid detachment and reattachment of cross-bridges without release of Pi or ATP hydrolysis.
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Affiliation(s)
- Dale C Bickham
- Molecular Medicine Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom
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24
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Ibanez-Garcia D, Requejo-Isidro J, Webb MR, West TG, French P, Ferenczi MA. Fluorescence lifetime imaging reveals that the environment of the ATP binding site of myosin in muscle senses force. Biophys J 2011; 99:2163-9. [PMID: 20923650 DOI: 10.1016/j.bpj.2010.07.052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2010] [Revised: 07/06/2010] [Accepted: 07/27/2010] [Indexed: 10/19/2022] Open
Abstract
Fluorescence lifetime imaging microscopy is used to demonstrate that different loads applied to a muscle fiber change the microenvironment of the nucleotide binding pocket of myosin. Permeabilized skeletal muscle fibers in rigor were labeled with a fluorescent ATP analog, 3'-DEAC-propylenediamine (pda)-ATP (3'-O-{N-[3-(7-diethylaminocoumarin-3-carboxamido)propyl]carbamoyl}ATP), which was hydrolyzed to the diphosphate. Cycles of small-amplitude stretches and releases (<1% of muscle segment length) were synchronized with fluorescence lifetime imaging and force measurements to correlate the effect of force on the lifetime of the ATP analog bound to the actomyosin complex. Analysis of the fluorescence decay resolved two lifetimes, corresponding to the free nucleotide DEAC-pda-ATP (τ(1) = 0.47 ± 0.03 ns; mean ± SD) and nucleotide bound to the actomyosin complex (τ(2) = 2.21 ± 0.06 ns at low strain). Whereas τ(1) did not change with force, τ(2) showed a linear dependence with the force applied to the muscle of 0.43 ± 0.05 ps/kPa. Hence, the molecular environment of the nucleotide binding pocket of myosin is directly affected by a change of length applied at the ends of the fiber segments. These changes may help explain how force modulates the actomyosin ATPase cycle and thus the physiology and energetics of contraction.
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25
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26
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Abstract
Almost all aspects of DNA metabolism involve separation of double-stranded DNA catalyzed by helicases. Observation and measurement of the dynamics of these events at the single-molecule level provide important mechanistic details of helicase activity and give the opportunity to probe aspects that are not revealed in bulk solution measurements. The assay, presented here, provides information about helicase unwinding rates and processivity. Visualization is achieved by using a fluorescent single-stranded DNA-binding protein (SSB), which allows the time course of individual DNA unwinding events to be observed using total internal reflection fluorescence microscopy. Observation of a prototypical helicase, Bacillus subtilis AddAB, shows that the unwinding process consists of bursts of unwinding activity, interspersed with periods of pausing.
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Affiliation(s)
- Natalia Fili
- MRC National Institute for Medical Research, London, UK.
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27
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Yeeles JTP, Gwynn EJ, Webb MR, Dillingham MS. The AddAB helicase-nuclease catalyses rapid and processive DNA unwinding using a single Superfamily 1A motor domain. Nucleic Acids Res 2010; 39:2271-85. [PMID: 21071401 PMCID: PMC3064778 DOI: 10.1093/nar/gkq1124] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The oligomeric state of Superfamily I DNA helicases is the subject of considerable and ongoing debate. While models based on crystal structures imply that a single helicase core domain is sufficient for DNA unwinding activity, biochemical data from several related enzymes suggest that a higher order oligomeric species is required. In this work we characterize the helicase activity of the AddAB helicase–nuclease, which is involved in the repair of double-stranded DNA breaks in Bacillus subtilis. We show that the enzyme is functional as a heterodimer of the AddA and AddB subunits, that it is a rapid and processive DNA helicase, and that it catalyses DNA unwinding using one single-stranded DNA motor of 3′→5′ polarity located in the AddA subunit. The AddB subunit contains a second putative ATP-binding pocket, but this does not contribute to the observed helicase activity and may instead be involved in the recognition of recombination hotspot sequences.
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Affiliation(s)
- Joseph T P Yeeles
- DNA-Protein Interactions Unit, School of Biochemistry, Medical Sciences Building, University of Bristol, University Walk, Bristol BS8 1TD, UK
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28
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Toseland CP, Webb MR. Fluorescence tools to measure helicase activity in real time. Methods 2010; 51:259-68. [DOI: 10.1016/j.ymeth.2010.02.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2009] [Revised: 02/03/2010] [Accepted: 02/12/2010] [Indexed: 11/16/2022] Open
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29
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Abstract
ATP-driven translocation of helicases along DNA can be assayed in several ways. Reagentless biosensors, based on fluorophore-protein adducts, provide convenient ways for real-time assays of both the separation of dsDNA and the hydrolysis of ATP. Single-stranded DNA can be assayed using a modified single-stranded DNA-binding protein (SSB), and phosphate production during ATP hydrolysis can be measured by a modified phosphate-binding protein. Advantages and limitations of these approaches are compared with those of other types of measurements.
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Affiliation(s)
- Martin R Webb
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London, UK
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30
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Abstract
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Fluorescence assays for ADP detection are of considerable current interest, both in basic research and in drug discovery, as they provide a generic method for measuring the activity of ATPases and kinases. The development of a novel fluorescent biosensor is described that is based on a tetramethylrhodamine-labeled, bacterial actin homologue, ParM. The design of the biosensor takes advantage of the large conformational change of ParM on ADP binding and the strong quenching of the tetramethylrhodamine fluorescence by stacking of the dye. ParM was labeled with two tetramethylrhodamines in close proximity, whereby the fluorophores are able to interact with each other. ADP binding alters the distance and relative orientation of the tetramethylrhodamines, which leads to a change in this stacking interaction and so in the fluorescence intensity. The final ADP biosensor shows ∼15-fold fluorescence increase in response to ADP binding. It has relatively weak affinity for ADP (Kd = 30 μM), enabling it to be used at substoichiometric concentrations relative to ADP, while reporting ADP concentration changes in a wide range around the Kd value, namely, submicromolar to tens of micromolar. The biosensor strongly discriminates against ATP (>100-fold), allowing ADP detection against a background of millimolar ATP. At 20 °C, the labeled ParM binds ADP with a rate constant of 9.5 × 104 M−1 s−1 and the complex dissociates at 2.9 s−1. Thus, the biosensor is suitable for real-time measurements, and its performance in such assays is demonstrated using a sugar kinase and a mammalian protein kinase.
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Affiliation(s)
- Simone Kunzelmann
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
| | - Martin R. Webb
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
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31
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Fili N, Mashanov GI, Toseland CP, Batters C, Wallace MI, Yeeles JTP, Dillingham MS, Webb MR, Molloy JE. Visualizing helicases unwinding DNA at the single molecule level. Nucleic Acids Res 2010; 38:4448-57. [PMID: 20350930 PMCID: PMC2910053 DOI: 10.1093/nar/gkq173] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
DNA helicases are motor proteins that catalyze the unwinding of double-stranded DNA into single-stranded DNA using the free energy from ATP hydrolysis. Single molecule approaches enable us to address detailed mechanistic questions about how such enzymes move processively along DNA. Here, an optical method has been developed to follow the unwinding of multiple DNA molecules simultaneously in real time. This was achieved by measuring the accumulation of fluorescent single-stranded DNA-binding protein on the single-stranded DNA product of the helicase, using total internal reflection fluorescence microscopy. By immobilizing either the DNA or helicase, localized increase in fluorescence provides information about the rate of unwinding and the processivity of individual enzymes. In addition, it reveals details of the unwinding process, such as pauses and bursts of activity. The generic and versatile nature of the assay makes it applicable to a variety of DNA helicases and DNA templates. The method is an important addition to the single-molecule toolbox available for studying DNA processing enzymes.
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Affiliation(s)
- Natali Fili
- MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, UK
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32
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Abstract
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A single-stranded DNA binding protein (SSB), labeled with a fluorophore, interacts with single-stranded DNA (ssDNA), giving a 6-fold increase in fluorescence. The labeled protein is the adduct of the G26C mutant of the homotetrameric SSB from Escherichia coli and a diethylaminocoumarin {N-[2-(iodoacetamido)ethyl]-7-diethylaminocoumarin-3-carboxamide}. This adduct can be used to assay production of ssDNA during separation of double-stranded DNA by helicases. To use this probe effectively, as well as to investigate the interaction between ssDNA and SSB, the fluorescent SSB has been used to develop the kinetic mechanism by which the protein and ssDNA associate and dissociate. Under conditions where ∼70 base lengths of ssDNA wrap around the tetramer, initial association is relatively simple and rapid, possibly diffusion-controlled. The kinetics are similar for a 70-base length of ssDNA, which binds one tetramer, and poly(dT), which could bind several. Under some conditions (high SSB and/or low ionic strength), a second tetramer binds to each 70-base length, but at a rate 2 orders of magnitude slower than the rate of binding of the first tetramer. Dissociation kinetics are complex and greatly accelerated by the presence of free wild-type SSB. The main route of dissociation of the fluorescent SSB·ssDNA complex is via association first with an additional SSB and then dissociation. Comparison of binding data with different lengths of ssDNA gave no evidence of cooperativity between tetramers. Analytical ultracentrifugation was used to determine the dissociation constant for labeled SSB2·dT70 to be 1.1 μM at a high ionic strength (200 mM NaCl). Shorter lengths of ssDNA were tested for binding: only when the length is reduced to 20 bases is the affinity significantly reduced.
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Affiliation(s)
- Simone Kunzelmann
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK
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33
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Abstract
Nearly every cellular process requires the presence of ATP. This is reflected in the vast number of enzymes like kinases or ATP hydrolases, both of which cleave the terminal phosphate from ATP, thereby releasing ADP. Despite the fact that ATP hydrolysis is one of the most fundamental reactions in biological systems, there are only a few methods available for direct measurements of enzymatic-driven ATP conversion. Here we describe the development of a reagentless biosensor for ADP, the common product of all ATPases and kinases, which allows the real-time detection of ADP, produced enzymatically. The biosensor is derived from a bacterial actin homologue, ParM, as protein framework. A single fluorophore (a diethylaminocoumarin), attached to ParM at the edge of the nucleotide binding site, couples ADP binding to a >3.5-fold increase in fluorescence intensity. The labeled ParM variant has high affinity for ADP (0.46 μm) and a fast signal response, controlled by the rate of ADP binding to the sensor (0.65 μm−1s−1). Amino acids in the active site were mutated to reduce ATP affinity and achieve a >400-fold discrimination against triphosphate binding. A further mutation ensured that the final sensor did not form filaments and, as a consequence, has extremely low ATPase activity. The broad applicability of N-[2-(1-maleimidyl)ethyl]-7-diethylaminocoumarin-3-carboxamide (MDCC)-ParM as a sensitive probe for ADP is demonstrated in real-time kinetic assays on two different ATPases and a protein kinase.
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Affiliation(s)
- Simone Kunzelmann
- MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, United Kingdom
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34
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Toseland CP, Martinez-Senac MM, Slatter AF, Webb MR. The ATPase cycle of PcrA helicase and its coupling to translocation on DNA. J Mol Biol 2009; 392:1020-32. [PMID: 19647000 DOI: 10.1016/j.jmb.2009.07.071] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2009] [Revised: 07/22/2009] [Accepted: 07/23/2009] [Indexed: 11/16/2022]
Abstract
The superfamily 1 bacterial helicase PcrA has a role in the replication of certain plasmids, acting with the initiator protein (RepD) that binds to and nicks the double-stranded origin of replication. PcrA also translocates single-stranded DNA with discrete steps of one base per ATP hydrolyzed. Individual rate constants have been determined for the DNA helicase PcrA ATPase cycle when bound to either single-stranded DNA or a double-stranded DNA junction that also has RepD bound. The fluorescent ATP analogue 2'(3')-O-(N-methylanthraniloyl)ATP was used throughout all experiments to provide a complete ATPase cycle for a single nucleotide species. Fluorescence intensity and anisotropy stopped-flow measurements were used to determine rate constants for binding and release. Quenched-flow measurements provided the kinetics of the hydrolytic cleavage step. The fluorescent phosphate sensor MDCC-PBP was used to measure phosphate release kinetics. The chemical cleavage step is the rate-limiting step in the cycle and is essentially irreversible and would result in the bound ATP complex being a major component at steady state. This cleavage step is greatly accelerated by bound DNA, producing the high activation of this protein compared to the protein alone. The data suggest the possibility that ADP is released in two steps, which would result in bound ADP also being a major intermediate, with bound ADP.P(i) being a very small component. It therefore seems likely that the major transition in structure occurs during the cleavage step, rather than P(i) release. ATP rebinding could then cause reversal of this structural transition. The kinetic mechanism of the PcrA ATPase cycle is very little changed by potential binding to RepD, supporting the idea that RepD increases the processivity of PcrA by increasing affinity to DNA rather than affecting the enzymatic properties per se.
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Affiliation(s)
- Christopher P Toseland
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK
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35
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Slatter AF, Thomas CD, Webb MR. PcrA helicase tightly couples ATP hydrolysis to unwinding double-stranded DNA, modulated by the initiator protein for plasmid replication, RepD. Biochemistry 2009; 48:6326-34. [PMID: 19473041 PMCID: PMC2776994 DOI: 10.1021/bi900101h] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The plasmid replication initiator protein, RepD, greatly stimulates the ability of the DNA helicase, PcrA, to unwind plasmid lengths of DNA. Unwinding begins at oriD, the double-stranded origin of replication that RepD recognizes and covalently binds to initiate replication. Using a combination of plasmids containing oriD and oligonucleotide structures that mimic parts of oriD, the kinetics of DNA nicking and separation have been determined, along with the coupling ratio between base separation and ATP hydrolysis. At 30 °C, the rate of nicking is 1.0 s−1, and translocation is ∼30 bp s−1. During translocation, the coupling ratio is one ATP hydrolyzed per base pair separated, the same as the value previously reported for ATP hydrolyzed per base moved by PcrA along single-stranded DNA. The data suggest that processivity is high, such that several thousand base-pair plasmids are unwound by a single molecule of PcrA. In the absence of RepD, a single PcrA is unable to separate even short lengths (10 to 40 bp) of double stranded DNA.
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Affiliation(s)
- Andrew F Slatter
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, U.K
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36
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Saikrishnan K, Powell B, Cook NJ, Webb MR, Wigley DB. Mechanistic basis of 5'-3' translocation in SF1B helicases. Cell 2009; 137:849-59. [PMID: 19490894 DOI: 10.1016/j.cell.2009.03.036] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2008] [Revised: 01/27/2009] [Accepted: 03/19/2009] [Indexed: 02/04/2023]
Abstract
Superfamily 1B (SF1B) helicases translocate in a 5'-3' direction and are required for a range of cellular activities across all domains of life. However, structural analyses to date have focused on how SF1A helicases achieve 3'-5' movement along nucleic acids. We present crystal structures of the complex between the SF1B helicase RecD2 from Deinococcus radiodurans and ssDNA in the presence and absence of an ATP analog. These snapshots of the reaction pathway reveal a nucleotide binding-induced conformational change of the two motor domains that is broadly reminiscent of changes observed in other SF1 and SF2 helicases. Together with biochemical data, the structures point to a step size for translocation of one base per ATP hydrolyzed. Moreover, the structures also reveal a mechanism for nucleic acid translocation in the 5'-3' direction by SF1B helicases that is surprisingly different from that of 3'-5' translocation by SF1A enzymes, and explains the molecular basis of directionality.
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Affiliation(s)
- Kayarat Saikrishnan
- Cancer Research UK Clare Hall Laboratories, The London Research Institute, Blanche Lane, South Mimms, Potters Bar, Herts EN63LD, UK
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37
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West TG, Hild G, Siththanandan VB, Webb MR, Corrie JE, Ferenczi MA. Time course and strain dependence of ADP release during contraction of permeabilized skeletal muscle fibers. Biophys J 2009; 96:3281-94. [PMID: 19383472 PMCID: PMC2718302 DOI: 10.1016/j.bpj.2009.01.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 12/17/2008] [Accepted: 01/08/2009] [Indexed: 10/20/2022] Open
Abstract
A phosphorylated, single cysteine mutant of nucleoside diphosphate kinase, labeled with N-[2-(iodoacetamido)ethyl]-7-diethylaminocoumarin-3-carboxamide (P approximately NDPK-IDCC), was used as a fluorescence probe for time-resolved measurement of changes in [MgADP] during contraction of single permeabilized rabbit psoas fibers. The dephosphorylation of the phosphorylated protein by MgADP occurs within the lattice environment of permeabilized fibers with a second-order rate constant at 12 degrees C of 10(5) M(-1) s(-1). This dephosphorylation is accompanied by a change in coumarin fluorescence. We report the time course of P approximately NDPK-IDCC dephosphorylation during the period of active isometric force redevelopment after quick release of fiber strain at pCa(2+) of 4.5. After a rapid length decrease of 0.5% was applied to the fiber, the extra NDPK-IDCC produced during force recovery, above the value during the approximately steady state of isometric contraction, was 2.7 +/- 0.6 microM and 4.7 +/- 1.5 microM at 12 and 20 degrees C, respectively. The rates of P approximately NDPK-IDCC dephosphorylation during force recovery were 28 and 50 s(-1) at 12 and 20 degrees C, respectively. The time courses of isometric force and P approximately NDPK-IDCC dephosphorylation were simulated using a seven-state reaction scheme. Relative isometric force was modeled by changes in the occupancy of strongly bound A.M.ADP.P(i) and A.M.ADP states. A strain-sensitive A.M.ADP isomerization step was rate-limiting (3-6 s(-1)) in the cross-bridge turnover during isometric contraction. At 12 degrees C, the A.M.ADP.P(i) and the pre- and postisomerization A.M.ADP states comprised 56%, 38%, and 7% of the isometric force-bearing AM states, respectively. At 20 degrees C, the force-bearing A.M.ADP.P(i) state was a lower proportion of the total force-bearing states (37%), whereas the proportion of postisomerization A.M.ADP states was higher (19%). The simulations suggested that release of cross-bridge strain caused rapid depopulation of the preisomerization A.M.ADP state and transient accumulation of MgADP in the postisomerization A.M.ADP state. Hence, the strain-sensitive isomerization of A.M.ADP seems to explain the rate of change of P approximately NDPK-IDCC dephosphorylation during force recovery. The temperature-dependent isometric distribution of myosin states is consistent with the previous observation of a small decrease in amplitude of the P(i) transient during force recovery at 20 degrees C and the current observation of an increase in amplitude of the ADP-sensitive NDPK-IDCC transient.
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Affiliation(s)
- Timothy G. West
- Imperial College London, Molecular Medicine Section, National Heart and Lung Institute, London, United Kingdom
| | - Gabor Hild
- Imperial College London, Molecular Medicine Section, National Heart and Lung Institute, London, United Kingdom
- Department of Biophysics, University of Pécs, Pécs, Hungary
| | - Verl B. Siththanandan
- Laboratory of Molecular Physiology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Martin R. Webb
- MRC National Institute for Medical Research, London, United Kingdom
| | - John E.T. Corrie
- MRC National Institute for Medical Research, London, United Kingdom
| | - Michael A. Ferenczi
- Imperial College London, Molecular Medicine Section, National Heart and Lung Institute, London, United Kingdom
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Khromov AS, Webb MR. Kinetics of ADP Release From Cycling Cross Bridges In Contracting Skinned Cardiac Muscle Monitored With A Fluorescent Probe. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.3284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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39
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Kunzelmann S, Webb MR. Fluorescent, Protein-Based Sensors for ADP. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.3128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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40
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Toseland CP, Webb MR. PcrA Helicase ATPase Mechanism: RepD Modulation During Unwinding. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.2122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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41
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Forgacs E, Sakamoto T, Cartwright S, Belknap B, Kovács M, Tóth J, Webb MR, Sellers JR, White HD. Switch 1 mutation S217A converts myosin V into a low duty ratio motor. J Biol Chem 2008; 284:2138-49. [PMID: 19008235 DOI: 10.1074/jbc.m805530200] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have determined the kinetic mechanism and motile properties of the switch 1 mutant S217A of myosin Va. Phosphate dissociation from myosin V-ADP-Pi (inorganic phosphate) and actomyosin V-ADP-Pi and the rate of the hydrolysis step (myosin V-ATP-->myosin V-ADP-Pi) were all approximately 10-fold slower in the S217A mutant than in wild type (WT) myosin V, resulting in a slower steady-state rate of basal and filamentous actin (actin)-activated ATP hydrolysis. Substrate binding and ADP dissociation kinetics were all similar to or slightly faster in S217A than in WT myosin V and mechanochemical gating of the rates of dissociation of ADP between trail and lead heads is maintained. The reduction in the rate constants of the hydrolysis and phosphate dissociation steps reduces the duty ratio from approximately 0.85 in WT myosin V to approximately 0.25 in S217A and produces a motor in which the average run length on actin at physiological concentrations of ATP is reduced 10-fold. Thus we demonstrate that, by mutational perturbation of the switch 1 structure, myosin V can be converted into a low duty ratio motor that is processive only at low substrate concentrations.
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Affiliation(s)
- Eva Forgacs
- Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, Virginia 23507, USA
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42
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Sakamoto T, Webb MR, Forgacs E, White HD, Sellers JR. Direct observation of the mechanochemical coupling in myosin Va during processive movement. Nature 2008; 455:128-32. [PMID: 18668042 DOI: 10.1038/nature07188] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2008] [Accepted: 06/03/2008] [Indexed: 11/09/2022]
Abstract
Myosin Va transports intracellular cargoes along actin filaments in cells. This processive, two-headed motor takes multiple 36-nm steps in which the two heads swing forward alternately towards the barbed end of actin driven by ATP hydrolysis. The ability of myosin Va to move processively is a function of its long lever arm, the high duty ratio of its kinetic cycle and the gating of the kinetics between the two heads such that ADP release from the lead head is greatly retarded. Mechanical studies at the multiple- and the single-molecule level suggest that there is tight coupling (that is, one ATP is hydrolysed per power stroke), but this has not been directly demonstrated. We therefore investigated the coordination between the ATPase mechanism of the two heads of myosin Va and directly visualized the binding and dissociation of single fluorescently labelled nucleotide molecules, while simultaneously observing the stepping motion of the fluorescently labelled myosin Va as it moved along an actin filament. Here we show that preferential ADP dissociation from the trail head of mouse myosin Va is followed by ATP binding and a synchronous 36-nm step. Even at low ATP concentrations, the myosin Va molecule retained at least one nucleotide (ADP in the lead head position) when moving. Thus, we directly demonstrate tight coupling between myosin Va movement and the binding and dissociation of nucleotide by simultaneously imaging with near nanometre precision.
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Affiliation(s)
- Takeshi Sakamoto
- Laboratory of Molecular Physiology, National Heart, Lung and Blood Institute, Bethesda, Maryland 20892, USA
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43
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Forgacs E, Cartwright S, Sakamoto T, Sellers JR, Corrie JET, Webb MR, White HD. Kinetics of ADP dissociation from the trail and lead heads of actomyosin V following the power stroke. J Biol Chem 2007; 283:766-73. [PMID: 17965414 DOI: 10.1074/jbc.m704313200] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Myosin V is a cellular motor protein, which transports cargos along actin filaments. It moves processively by 36-nm steps that require at least one of the two heads to be tightly bound to actin throughout the catalytic cycle. To elucidate the kinetic mechanism of processivity, we measured the rate of product release from the double-headed myosin V-HMM using a new ATP analogue, 3'-(7-diethylaminocoumarin-3-carbonylamino)-3'-deoxy-ATP (deac-aminoATP), which undergoes a 20-fold increase in fluorescence emission intensity when bound to the active site of myosin V (Forgacs, E., Cartwright, S., Kovács, M., Sakamoto, T., Sellers, J. R., Corrie, J. E. T., Webb, M. R., and White, H. D. (2006) Biochemistry 45, 13035-13045). The kinetics of ADP and deac-aminoADP dissociation from actomyosin V-HMM, following the power stroke, were determined using double-mixing stopped-flow fluorescence. These used either deac-aminoATP as the substrate with ADP or ATP chase or alternatively ATP as the substrate with either a deac-aminoADP or deac-aminoATP chase. Both sets of experiments show that the observed rate of ADP or deac-aminoADP dissociation from the trail head of actomyosin V-HMM is the same as from actomyosin V-S1. The dissociation of ADP from the lead head is decreased by up to 250-fold.
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Affiliation(s)
- Eva Forgacs
- Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, Virginia 23507, USA
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44
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Abstract
A novel biosensor for inorganic phosphate (Pi) has been developed based on the phosphate binding protein of Escherichia coli. Two cysteine mutations were introduced and labeled with 6-iodoacetamidotetramethylrhodamine. When physically close to each other and correctly oriented, two rhodamine dyes interact to form a noncovalent dimer. In this state, they have little or no fluorescence, unlike the high fluorescence intensity of monomeric rhodamine. The labeling sites were so placed that the distance and orientation between the rhodamines change as a consequence of the conformational change associated with Pi binding. This movement alters the extent of interaction between the dyes. The best mutant of those tested (A17C, A197C) gives rise on average to approximately 18-fold increase in fluorescence intensity as Pi binds. The kinetics of interaction with Pi were measured at 10 degrees C. Under these conditions, the fluorescence increase associated with Pi binding has a maximum rate of 267 s-1. The Pi dissociation rate is 6.6 s-1, and the dissociation constant is 70 nM. An application of the sensor is demonstrated for measuring ATP hydrolysis in real time as a helicase moves along DNA. Advantages of the new sensor are discussed, both in terms of the use of a rhodamine fluorophore and the potential of this double labeling strategy.
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Affiliation(s)
- Michael P Okoh
- MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, United Kingdom
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45
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Abstract
Biosensors are becoming widely used both in basic research and in screening assays and reagentless sensors with fluorescent reporter groups attached to proteins form one class. This article describes the development of sensors for two small molecules, driven in particular by the need for high sensitivity and time resolution to probe mechanistic aspects of ATP-coupled motor proteins. The biosensors are for the products of the ATPase reaction, ADP and inorganic phosphate. The interplay between the possibilities for design and understanding the mechanism of the signal are discussed. Examples are described of how these sensors have been applied to understanding myosin and helicase motors.
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Affiliation(s)
- Martin R Webb
- MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London, UK NW7 1AA.
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46
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Forgacs E, Cartwright S, Kovács M, Sakamoto T, Sellers JR, Corrie JET, Webb MR, White HD. Kinetic mechanism of myosinV-S1 using a new fluorescent ATP analogue. Biochemistry 2006; 45:13035-45. [PMID: 17059220 DOI: 10.1021/bi060712n] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have used a new fluorescent ATP analogue, 3'-(7-diethylaminocoumarin-3-carbonylamino)-3'-deoxyadenosine-5'-triphosphate (deac-aminoATP), to study the ATP hydrolysis mechanism of the single headed myosinV-S1. Our study demonstrates that deac-aminoATP is an excellent substrate for these studies. Although the deac-amino nucleotides have a low quantum yield in free solution, there is a very large increase in fluorescence emission ( approximately 20-fold) upon binding to the myosinV active site. The fluorescence emission intensity is independent of the hydrolysis state of the nucleotide bound to myosinV-S1. The very good signal-to-noise ratio that is obtained with deac-amino nucleotides makes them excellent substrates for studying expressed proteins that can only be isolated in small quantities. The combination of the fast rate of binding and the favorable signal-to-noise ratio also allows deac-nucleotides to be used in chase experiments to determine the kinetics of ADP and Pi dissociation from actomyosin-ADP-Pi. Although phosphate dissociation from actomyosinV-ADP-Pi does not itself produce a fluorescence signal, it produces a lag in the signal for deac-aminoADP dissociation. The lag provides direct evidence that the principal pathway of product dissociation from actomyosinV-ADP-Pi is an ordered mechanism in which phosphate precedes ADP. Although the mechanism of hydrolysis of deac-aminoATP by (acto)myosinV-S1 is qualitatively similar to the ATP hydrolysis mechanism, there are significant differences in some of the rate constants. Deac-aminoATP binds 3-fold faster to myosinV-S1, and the rate of deac-aminoADP dissociation from actomyosinV-S1 is 20-fold slower. Deac-aminoATP supports motility by myosinV-HMM on actin at a rate consistent with the slower rate of deac-aminoADP dissociation.
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Affiliation(s)
- Eva Forgacs
- Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, Virginia 23507, USA
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47
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Alahyan M, Webb MR, Marston SB, El-Mezgueldi M. The mechanism of smooth muscle caldesmon-tropomyosin inhibition of the elementary steps of the actomyosin ATPase. J Biol Chem 2006; 281:19433-48. [PMID: 16540476 DOI: 10.1074/jbc.m507602200] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Caldesmon is a component of smooth muscle thin filaments that inhibits the actomyosin ATPase via its interaction with actin-tropomyosin. We have performed a comprehensive transient kinetic characterization of the actomyosin ATPase in the presence of smooth muscle caldesmon and tropomyosin. At physiological ratios of caldesmon to actin (1 caldesmon/7 actin monomers) actomyosin ATPase is inhibited by about 75%. Inhibitory caldesmon concentrations had little effect upon the rate of S1 binding to actin, actin-S1 dissociation by ATP, and dissociation of ADP from actin-S1 x ADP; however the rate of phosphate release from the actin-S1 x ADP x P(i) complex was decreased by more than 80%. In addition the transient of phosphate release displayed a lag of up to 200 ms. The presence of a lag phase indicates that a step on the pathway prior to phosphate release has become rate-limiting. Premixing the actin-tropomyosin filaments with myosin heads resulted in the disappearance of the lag phase. We conclude that caldesmon inhibition of the rate of phosphate release is caused by the thin filament being switched by caldesmon to an inactive state. The active and inactive states correspond to the open and closed states observed in skeletal muscle thin filaments with no evidence for the existence of a third, blocked state. Taken together these data suggest that at physiological concentrations, caldesmon controls the isomerization of the weak binding complex to the strong binding complex, and this causes the inhibition of the rate of phosphate release. This inhibition is sufficient to account for the inhibition of the steady state actomyosin ATPase by caldesmon and tropomyosin.
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Affiliation(s)
- Mustapha Alahyan
- Myocardial Systems Biology Group, National Heart and Lung Institute, Imperial College, London SW3 6LY
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48
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Abstract
RecG is a DNA helicase involved in the repair of damage at a replication fork and catalyzes the reversal of the fork to a point beyond the damage in the template strand. It unwinds duplex DNA in reactions that are coupled to ATP hydrolysis. The kinetic mechanism of duplex DNA unwinding by RecG was analyzed using a quantitative fluorescence assay based on the process of contact quenching between Cy3 and Dabcyl groups attached to synthetic three-way DNA junctions. The data show that the protein moves at a rate of 26 bp s(-1) along the duplex DNA during the unwinding process. RecG ATPase activity during translocation indicates a constant rate of 7.6 s(-1), measured using a fluorescent phosphate sensor, MDCC-PBP. These two rates imply a movement of approximately 3 bp per ATP hydrolyzed. We demonstrate in several trapping experiments that RecG remains attached to DNA after translocation to the end of the arm of the synthetic DNA junction. ATPase activity continues after translocation is complete. Dissociation of RecG from the product DNA occurs only very slowly, suggesting strong interactions between them. The data support the idea that interactions of the duplex template arm with the protein are the major sites of binding and production of translocation.
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49
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50
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Abstract
We recently demonstrated that the RecBCD enzyme is a bipolar DNA helicase that employs two single-stranded DNA motors of opposite polarity to drive translocation and unwinding of duplex DNA. We hypothesized that this organization may explain the exceptionally high rate and processivity of DNA unwinding catalyzed by the RecBCD enzyme. Using a stopped-flow dye displacement assay for unwinding activity, we test this idea by analyzing mutant RecBCD enzymes in which either of the two helicase motors is inactivated by mutagenesis. Like the wild-type RecBCD enzyme, the two mutant proteins maintain the ability to bind tightly to blunt duplex DNA ends in the absence of ATP. However, the rate of forward translocation for the RecB motor-defective enzyme is only approximately 30% of the wild-type rate, whereas for the RecD motor-defective enzyme, it is approximately 50%. More significantly, the processivity of translocation is substantially reduced by approximately 25- and 6-fold for each mutant enzyme, respectively. Despite retaining the capacity to bind blunt dsDNA, the RecB-mutant enzyme has lost the ability to unwind DNA unless the substrate contains a short 5'-terminated single-stranded DNA overhang. The consequences of this observation for the architecture of the single-stranded DNA motors in the initiation complex are discussed.
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Affiliation(s)
- Mark S Dillingham
- Section of Microbiology, Center for Genetics and Development, University of California, Davis, California 95616, USA
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