1
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Saha S, Kanaujia SP. Structural and functional characterization of archaeal DIMT1 unveils distinct protein dynamics essential for efficient catalysis. Structure 2024:S0969-2126(24)00276-4. [PMID: 39146930 DOI: 10.1016/j.str.2024.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 06/29/2024] [Accepted: 07/19/2024] [Indexed: 08/17/2024]
Abstract
Dimethyladenosine transferase 1 (DIMT1), an ortholog of bacterial KsgA is a conserved protein that assists in ribosome biogenesis by modifying two successive adenosine bases near the 3' end of small subunit (SSU) rRNA. Although KsgA/DIMT1 proteins have been characterized in bacteria and eukaryotes, they are yet unexplored in archaea. Also, their dynamics are not well understood. Here, we structurally and functionally characterized the apo and holo forms of archaeal DIMT1 from Pyrococcus horikoshii. Wild-type protein and mutants were analyzed to capture different transition states, including open, closed, and intermediate states. This study reports a unique inter-domain movement that is needed for substrate (RNA) positioning in the catalytic pocket, and is only observed in the presence of the cognate cofactors S-adenosyl-L-methionine (SAM) or S-adenosyl-L-homocysteine (SAH). The binding of the inhibitor sinefungine, an analog of SAM or SAH, to archaeal DIMT1 blocks the catalytic pocket and renders the enzyme inactive.
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Affiliation(s)
- Sayan Saha
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Shankar Prasad Kanaujia
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
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2
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Werner AD, Krapoth N, Norris MJ, Heine A, Klebe G, Saphire EO, Becker S. Development of a Crystallographic Screening to Identify Sudan Virus VP40 Ligands. ACS OMEGA 2024; 9:33193-33203. [PMID: 39100314 PMCID: PMC11292656 DOI: 10.1021/acsomega.4c04829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 07/05/2024] [Accepted: 07/05/2024] [Indexed: 08/06/2024]
Abstract
The matrix protein VP40 of the highly pathogenic Sudan virus (genus Orthoebolavirus) is a multifunctional protein responsible for the recruitment of viral nucleocapsids to the plasma membrane and the budding of infectious virions. In addition to its role in assembly, VP40 also downregulates viral genome replication and transcription. VP40's existence in various homo-oligomeric states is presumed to underpin its diverse functional capabilities during the viral life cycle. Given the absence of licensed therapeutics targeting the Sudan virus, our study focused on inhibiting VP40 dimers, the structural precursors to critical higher-order oligomers, as a novel antiviral strategy. We have established a crystallographic screening pipeline for the identification of small-molecule fragments capable of binding to VP40. Dimeric VP40 of the Sudan virus was recombinantly expressed in bacteria, purified, crystallized, and soaked in a solution of 96 different preselected fragments. Salicylic acid was identified as a crystallographic hit with clear electron density in the pocket between the N- and the C-termini of the VP40 dimer. The binding interaction is predominantly coordinated by amino acid residues leucine 158 (L158) and arginine 214 (R214), which are key in stabilizing salicylic acid within the binding pocket. While salicylic acid displayed minimal impact on the functional aspects of VP40, we delved deeper into characterizing the druggability of the identified binding pocket. We analyzed the influence of residues L158 and R214 on the formation of virus-like particles and viral RNA synthesis. Site-directed mutagenesis of these residues to alanine markedly affected both VP40's budding activity and its effect on viral RNA synthesis, underscoring the potential of the salicylic acid binding pocket as a drug target. In summary, our findings lay the foundation for structure-guided drug design to provide lead compounds against Sudan virus VP40.
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Affiliation(s)
| | - Nils Krapoth
- Institute
for Virology, University of Marburg, D-35043 Marburg, Hessen, Germany
- Institut
für Molekulare Biologie gGmbH, D-55128 Mainz, Rheinland-Pfalz, Germany
| | - Michael J. Norris
- Department
of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A1, Canada
| | - Andreas Heine
- Institute
of Pharmaceutical Chemistry, University
of Marburg, D-35032 Marburg, Hessen, Germany
| | - Gerhard Klebe
- Institute
of Pharmaceutical Chemistry, University
of Marburg, D-35032 Marburg, Hessen, Germany
| | | | - Stephan Becker
- Institute
for Virology, University of Marburg, D-35043 Marburg, Hessen, Germany
- Partnersite
Giessen-Marburg-Langen, German Centre for
Infection Research, D-35043 Marburg, Hessen, Germany
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3
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Zhang H, Dierkes RF, Perez-Garcia P, Costanzi E, Dittrich J, Cea PA, Gurschke M, Applegate V, Partus K, Schmeisser C, Pfleger C, Gohlke H, Smits SHJ, Chow J, Streit WR. The metagenome-derived esterase PET40 is highly promiscuous and hydrolyses polyethylene terephthalate (PET). FEBS J 2024; 291:70-91. [PMID: 37549040 DOI: 10.1111/febs.16924] [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: 01/31/2023] [Revised: 07/24/2023] [Accepted: 08/07/2023] [Indexed: 08/09/2023]
Abstract
Polyethylene terephthalate (PET) is a widely used synthetic polymer and known to contaminate marine and terrestrial ecosystems. Only few PET-active microorganisms and enzymes (PETases) are currently known, and it is debated whether degradation activity for PET originates from promiscuous enzymes with broad substrate spectra that primarily act on natural polymers or other bulky substrates, or whether microorganisms evolved their genetic makeup to accepting PET as a carbon source. Here, we present a predicted diene lactone hydrolase designated PET40, which acts on a broad spectrum of substrates, including PET. It is the first esterase with activity on PET from a GC-rich Gram-positive Amycolatopsis species belonging to the Pseudonocardiaceae (Actinobacteria). It is highly conserved within the genera Amycolatopsis and Streptomyces. PET40 was identified by sequence-based metagenome search using a PETase-specific hidden Markov model. Besides acting on PET, PET40 has a versatile substrate spectrum, hydrolyzing δ-lactones, β-lactam antibiotics, the polyester-polyurethane Impranil® DLN, and various para-nitrophenyl ester substrates. Molecular docking suggests that the PET degradative activity is likely a result of the promiscuity of PET40, as potential binding modes were found for substrates encompassing mono(2-hydroxyethyl) terephthalate, bis(2-hydroxyethyl) terephthalate, and a PET trimer. We also solved the crystal structure of the inactive PET40 variant S178A to 1.60 Å resolution. PET40 is active throughout a wide pH (pH 4-10) and temperature range (4-65 °C) and remarkably stable in the presence of 5% SDS, making it a promising enzyme as a starting point for further investigations and optimization approaches.
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Affiliation(s)
- Hongli Zhang
- Department of Microbiology and Biotechnology, University of Hamburg, Germany
| | - Robert F Dierkes
- Department of Microbiology and Biotechnology, University of Hamburg, Germany
| | - Pablo Perez-Garcia
- Department of Microbiology and Biotechnology, University of Hamburg, Germany
- Molecular Microbiology, Institute for General Microbiology, Kiel University, Germany
| | - Elisa Costanzi
- Center for Structural Studies, Heinrich Heine University, Düsseldorf, Germany
| | - Jonas Dittrich
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich Heine University, Düsseldorf, Germany
| | - Pablo A Cea
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich Heine University, Düsseldorf, Germany
| | - Marno Gurschke
- Department of Microbiology and Biotechnology, University of Hamburg, Germany
| | - Violetta Applegate
- Center for Structural Studies, Heinrich Heine University, Düsseldorf, Germany
| | - Kristina Partus
- Department of Microbiology and Biotechnology, University of Hamburg, Germany
| | - Christel Schmeisser
- Department of Microbiology and Biotechnology, University of Hamburg, Germany
| | - Christopher Pfleger
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich Heine University, Düsseldorf, Germany
| | - Holger Gohlke
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich Heine University, Düsseldorf, Germany
- Institute of Bio- and Geosciences (IBG-4: Bioinformatics), John von Neumann Institute for Computing and Jülich Supercomputing Centre, Forschungszentrum Jülich GmbH, Germany
| | - Sander H J Smits
- Center for Structural Studies, Heinrich Heine University, Düsseldorf, Germany
- Institute of Biochemistry, Heinrich Heine University, Düsseldorf, Germany
| | - Jennifer Chow
- Department of Microbiology and Biotechnology, University of Hamburg, Germany
| | - Wolfgang R Streit
- Department of Microbiology and Biotechnology, University of Hamburg, Germany
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4
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Mettler M, Dewandre A, Tumanov N, Wouters J, Septavaux J. Single crystal formation in core-shell capsules. Chem Commun (Camb) 2023; 59:12739-12742. [PMID: 37801289 DOI: 10.1039/d3cc03727d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
This work extends the scope of microfluidic-based crystallization methods by introducing solid microcapsules. Hundreds of perfectly similar microcapsules were generated per second, allowing a fast screening of crystallization conditions. XRD analyses were performed directly on encapsulated single crystals demonstrating the potential of this process for the characterization of compounds, including screening polymorphism.
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Affiliation(s)
- Marie Mettler
- Secoya Technologies Fond des Més 4, Louvain-la-Neuve 1348, Belgium.
| | - Adrien Dewandre
- Secoya Technologies Fond des Més 4, Louvain-la-Neuve 1348, Belgium.
| | - Nikolay Tumanov
- Namur Institute of Structured Matter (NISM) Université de Namur, Rue de Bruxelles 61, Namur 5000, Belgium
| | - Johan Wouters
- Namur Institute of Structured Matter (NISM) Université de Namur, Rue de Bruxelles 61, Namur 5000, Belgium
| | - Jean Septavaux
- Secoya Technologies Fond des Més 4, Louvain-la-Neuve 1348, Belgium.
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5
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Stegmann DP, Steuber J, Fritz G, Wojdyla JA, Sharpe ME. Fast fragment and compound screening pipeline at the Swiss Light Source. Methods Enzymol 2023; 690:235-284. [PMID: 37858531 DOI: 10.1016/bs.mie.2023.08.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
Crystallography-based fragment screening is a highly effective technique employed in structure-based drug discovery to expand the range of lead development opportunities. It allows screening and sorting of weakly binding, low molecular mass fragments, which can be developed into larger high-affinity lead compounds. Technical improvements at synchrotron beamlines, design of innovative libraries mapping chemical space efficiently, effective soaking methods and enhanced data analysis have enabled the implementation of high-throughput fragment screening pipelines at multiple synchrotron facilities. This widened access to CBFS beyond the pharma industry has allowed academic users to rapidly screen large quantities of fragment-soaked protein crystals. The positive outcome of a CBFS campaign is a set of structures that present the three-dimensional arrangement of fragment-protein complexes in detail, thereby providing information on the location and the mode of interaction of bound fragments. Through this review, we provide users with a comprehensive guide that sets clear expectations before embarking on a crystallography-based fragment screening campaign. We present a list of essential pre-requirements that must be assessed, including the suitability of your current crystal system for a fragment screening campaign. Furthermore, we extensively discuss the available methodological options, addressing their limitations and providing strategies to overcome them. Additionally, we provide a brief perspective on how to proceed once hits are obtained. Notably, we emphasize the solutions we have implemented for instrumentation and software development within our Fast Fragment and Compound Screening pipeline. We also highlight third-party software options that can be utilized for rapid refinement and hit assessment.
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Affiliation(s)
| | - Julia Steuber
- Institute of Biology, Department of Cellular Microbiology, University of Hohenheim, Stuttgart, Germany
| | - Günter Fritz
- Institute of Biology, Department of Cellular Microbiology, University of Hohenheim, Stuttgart, Germany.
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6
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Pletzer-Zelgert J, Ehrt C, Fender I, Griewel A, Flachsenberg F, Klebe G, Rarey M. LifeSoaks: a tool for analyzing solvent channels in protein crystals and obstacles for soaking experiments. Acta Crystallogr D Struct Biol 2023; 79:837-856. [PMID: 37561404 PMCID: PMC10478636 DOI: 10.1107/s205979832300582x] [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: 04/27/2023] [Accepted: 07/03/2023] [Indexed: 08/11/2023] Open
Abstract
Due to the structural complexity of proteins, their corresponding crystal arrangements generally contain a significant amount of solvent-occupied space. These areas allow a certain degree of intracrystalline protein flexibility and mobility of solutes. Therefore, knowledge of the geometry of solvent-filled channels and cavities is essential whenever the dynamics inside a crystal are of interest. Especially in soaking experiments for structure-based drug design, ligands must be able to traverse the crystal solvent channels and reach the corresponding binding pockets. Unsuccessful screenings are sometimes attributed to the geometry of the crystal packing, but the underlying causes are often difficult to understand. This work presents LifeSoaks, a novel tool for analyzing and visualizing solvent channels in protein crystals. LifeSoaks uses a Voronoi diagram-based periodic channel representation which can be efficiently computed. The size and location of channel bottlenecks, which might hinder molecular diffusion, can be directly derived from this representation. This work presents the calculated bottleneck radii for all crystal structures in the PDB and the analysis of a new, hand-curated data set of structures obtained by soaking experiments. The results indicate that the consideration of bottleneck radii and the visual inspection of channels are beneficial for planning soaking experiments.
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Affiliation(s)
| | - Christiane Ehrt
- Center for Bioinformatics, Universität Hamburg, Bundesstrasse 43, 20146 Hamburg, Germany
| | - Inken Fender
- Center for Bioinformatics, Universität Hamburg, Bundesstrasse 43, 20146 Hamburg, Germany
| | - Axel Griewel
- Center for Bioinformatics, Universität Hamburg, Bundesstrasse 43, 20146 Hamburg, Germany
| | - Florian Flachsenberg
- Center for Bioinformatics, Universität Hamburg, Bundesstrasse 43, 20146 Hamburg, Germany
| | - Gerhard Klebe
- Institut für Pharmazeutische Chemie, Universität Marburg, Marbacher Weg 6-10, 35032 Marburg, Germany
| | - Matthias Rarey
- Center for Bioinformatics, Universität Hamburg, Bundesstrasse 43, 20146 Hamburg, Germany
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7
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Mons E, Kim RQ, Mulder MPC. Technologies for Direct Detection of Covalent Protein—Drug Adducts. Pharmaceuticals (Basel) 2023; 16:ph16040547. [PMID: 37111304 PMCID: PMC10146396 DOI: 10.3390/ph16040547] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/29/2023] [Accepted: 04/03/2023] [Indexed: 04/08/2023] Open
Abstract
In the past two decades, drug candidates with a covalent binding mode have gained the interest of medicinal chemists, as several covalent anticancer drugs have successfully reached the clinic. As a covalent binding mode changes the relevant parameters to rank inhibitor potency and investigate structure-activity relationship (SAR), it is important to gather experimental evidence on the existence of a covalent protein–drug adduct. In this work, we review established methods and technologies for the direct detection of a covalent protein–drug adduct, illustrated with examples from (recent) drug development endeavors. These technologies include subjecting covalent drug candidates to mass spectrometric (MS) analysis, protein crystallography, or monitoring intrinsic spectroscopic properties of the ligand upon covalent adduct formation. Alternatively, chemical modification of the covalent ligand is required to detect covalent adducts by NMR analysis or activity-based protein profiling (ABPP). Some techniques are more informative than others and can also elucidate the modified amino acid residue or bond layout. We will discuss the compatibility of these techniques with reversible covalent binding modes and the possibilities to evaluate reversibility or obtain kinetic parameters. Finally, we expand upon current challenges and future applications. Overall, these analytical techniques present an integral part of covalent drug development in this exciting new era of drug discovery.
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Affiliation(s)
- Elma Mons
- Department of Cell and Chemical Biology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands
- Institute of Biology Leiden, Leiden University, 2333 BE Leiden, The Netherlands
| | - Robbert Q. Kim
- Department of Cell and Chemical Biology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands
| | - Monique P. C. Mulder
- Department of Cell and Chemical Biology, Leiden University Medical Center, 2300 RC Leiden, The Netherlands
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8
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Schneider DK, Soares AS, Lazo EO, Kreitler DF, Qian K, Fuchs MR, Bhogadi DK, Antonelli S, Myers SS, Martins BS, Skinner JM, Aishima J, Bernstein HJ, Langdon T, Lara J, Petkus R, Cowan M, Flaks L, Smith T, Shea-McCarthy G, Idir M, Huang L, Chubar O, Sweet RM, Berman LE, McSweeney S, Jakoncic J. AMX - the highly automated macromolecular crystallography (17-ID-1) beamline at the NSLS-II. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:1480-1494. [PMID: 36345756 PMCID: PMC9641562 DOI: 10.1107/s1600577522009377] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/24/2022] [Indexed: 06/16/2023]
Abstract
The highly automated macromolecular crystallography beamline AMX/17-ID-1 is an undulator-based high-intensity (>5 × 1012 photons s-1), micro-focus (7 µm × 5 µm), low-divergence (1 mrad × 0.35 mrad) energy-tunable (5-18 keV) beamline at the NSLS-II, Brookhaven National Laboratory, Upton, NY, USA. It is one of the three life science beamlines constructed by the NIH under the ABBIX project and it shares sector 17-ID with the FMX beamline, the frontier micro-focus macromolecular crystallography beamline. AMX saw first light in March 2016 and started general user operation in February 2017. At AMX, emphasis has been placed on high throughput, high capacity, and automation to enable data collection from the most challenging projects using an intense micro-focus beam. Here, the current state and capabilities of the beamline are reported, and the different macromolecular crystallography experiments that are routinely performed at AMX/17-ID-1 as well as some plans for the near future are presented.
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Affiliation(s)
| | | | - Edwin O. Lazo
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | | | - Kun Qian
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Martin R. Fuchs
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Dileep K. Bhogadi
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, California, USA
| | - Steve Antonelli
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Stuart S. Myers
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | | | - John M. Skinner
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Jun Aishima
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Herbert J. Bernstein
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
- Ronin Institute, Montclair, New Jersey, USA
| | - Thomas Langdon
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - John Lara
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Robert Petkus
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, USA
| | - Matt Cowan
- CSI, Brookhaven National Laboratory, Upton, New York, USA
| | - Leonid Flaks
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, USA
| | - Thomas Smith
- Physics Department, Brookhaven National Laboratory, Upton, New York, USA
| | | | - Mourad Idir
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Lei Huang
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Oleg Chubar
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Robert M. Sweet
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Lonny E. Berman
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Sean McSweeney
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
| | - Jean Jakoncic
- NSLS-II, Brookhaven National Laboratory, Upton, New York, USA
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9
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Stachowski TR, Fischer M. Large-Scale Ligand Perturbations of the Protein Conformational Landscape Reveal State-Specific Interaction Hotspots. J Med Chem 2022; 65:13692-13704. [PMID: 35970514 PMCID: PMC9619398 DOI: 10.1021/acs.jmedchem.2c00708] [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] [Indexed: 11/30/2022]
Abstract
![]()
Protein flexibility is important for ligand binding but
often ignored
in drug design. Considering proteins as ensembles rather than static
snapshots creates opportunities to target dynamic proteins that lack
FDA-approved drugs, such as the human chaperone, heat shock protein
90 (Hsp90). Hsp90α accommodates ligands with a dynamic lid domain,
yet no comprehensive analysis relating lid conformations to ligand
properties is available. To date, ∼300 ligand-bound Hsp90α
crystal structures are deposited in the Protein Data Bank, which enables
us to consider ligand binding as a perturbation of the protein conformational
landscape. By estimating binding site volumes, we classified structures
into distinct major and minor lid conformations. Supported by retrospective
docking, each conformation creates unique hotspots that bind chemically
distinguishable ligands. Clustering revealed insightful exceptions
and the impact of crystal packing. Overall, Hsp90α’s
plasticity provides a cautionary tale of overinterpreting individual
crystal structures and motivates an ensemble-based view of drug design.
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Affiliation(s)
- Timothy R Stachowski
- Department of Chemical Biology & Therapeutics, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, United States
| | - Marcus Fischer
- Department of Chemical Biology & Therapeutics, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, United States.,Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, United States
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10
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Wienen‐Schmidt B, Oebbeke M, Ngo K, Heine A, Klebe G. Two Methods, One Goal: Structural Differences between Cocrystallization and Crystal Soaking to Discover Ligand Binding Poses. ChemMedChem 2021; 16:292-300. [PMID: 33029876 PMCID: PMC7821316 DOI: 10.1002/cmdc.202000565] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/02/2020] [Indexed: 11/10/2022]
Abstract
In lead optimization, protein crystallography is an indispensable tool to analyze drug binding. Binding modes and non-covalent interaction inventories are essential to design follow-up synthesis candidates. Two protocols are commonly applied to produce protein-ligand complexes: cocrystallization and soaking. Because of its time and cost effectiveness, soaking is the more popular method. Taking eight ligand hinge binders of protein kinase A, we demonstrate that cocrystallization is superior. Particularly for flexible proteins, such as kinases, and larger ligands cocrystallization captures more reliable the correct binding pose and induced protein adaptations. The geometrical discrepancies between soaking and cocrystallization appear smaller for fragment-sized ligands. For larger flexible ligands that trigger conformational changes of the protein, soaking can be misleading and underestimates the number of possible polar interactions due to inadequate, highly impaired positions of protein amino-acid side and main chain atoms. Thus, if applicable cocrystallization should be the gold standard to study protein-ligand complexes.
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Affiliation(s)
- Barbara Wienen‐Schmidt
- Institut für Pharmazeutische ChemiePhilipps-Universität MarburgMarbacher Weg 635032MarburgGermany
| | - Matthias Oebbeke
- Institut für Pharmazeutische ChemiePhilipps-Universität MarburgMarbacher Weg 635032MarburgGermany
| | - Khang Ngo
- Institut für Pharmazeutische ChemiePhilipps-Universität MarburgMarbacher Weg 635032MarburgGermany
| | - Andreas Heine
- Institut für Pharmazeutische ChemiePhilipps-Universität MarburgMarbacher Weg 635032MarburgGermany
| | - Gerhard Klebe
- Institut für Pharmazeutische ChemiePhilipps-Universität MarburgMarbacher Weg 635032MarburgGermany
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