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Iyer S, Das C. The unity of opposites: Strategic interplay between bacterial effectors to regulate cellular homeostasis. J Biol Chem 2021; 297:101340. [PMID: 34695417 PMCID: PMC8605245 DOI: 10.1016/j.jbc.2021.101340] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 10/15/2021] [Accepted: 10/20/2021] [Indexed: 11/23/2022] Open
Abstract
Legionella pneumophila is a facultative intracellular pathogen that uses the Dot/Icm Type IV secretion system (T4SS) to translocate many effectors into its host and establish a safe, replicative lifestyle. The bacteria, once phagocytosed, reside in a vacuolar structure known as the Legionella-containing vacuole (LCV) within the host cells and rapidly subvert organelle trafficking events, block inflammatory responses, hijack the host ubiquitination system, and abolish apoptotic signaling. This arsenal of translocated effectors can manipulate the host factors in a multitude of different ways. These proteins also contribute to bacterial virulence by positively or negatively regulating the activity of one another. Such effector-effector interactions, direct and indirect, provide the delicate balance required to maintain cellular homeostasis while establishing itself within the host. This review summarizes the recent progress in our knowledge of the structure-function relationship and biochemical mechanisms of select effector pairs from Legionella that work in opposition to one another, while highlighting the diversity of biochemical means adopted by this intracellular pathogen to establish a replicative niche within host cells.
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Affiliation(s)
- Shalini Iyer
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA.
| | - Chittaranjan Das
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA.
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2
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Chatterjee BK, Truttmann MC. Fic and non-Fic AMPylases: protein AMPylation in metazoans. Open Biol 2021; 11:210009. [PMID: 33947243 PMCID: PMC8097203 DOI: 10.1098/rsob.210009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Protein AMPylation refers to the covalent attachment of an AMP moiety to the amino acid side chains of target proteins using ATP as nucleotide donor. This process is catalysed by dedicated AMP transferases, called AMPylases. Since this initial discovery, several research groups have identified AMPylation as a critical post-translational modification relevant to normal and pathological cell signalling in both bacteria and metazoans. Bacterial AMPylases are abundant enzymes that either regulate the function of endogenous bacterial proteins or are translocated into host cells to hijack host cell signalling processes. By contrast, only two classes of metazoan AMPylases have been identified so far: enzymes containing a conserved filamentation induced by cAMP (Fic) domain (Fic AMPylases), which primarily modify the ER-resident chaperone BiP, and SelO, a mitochondrial AMPylase involved in redox signalling. In this review, we compare and contrast bacterial and metazoan Fic and non-Fic AMPylases, and summarize recent technological and conceptual developments in the emerging field of AMPylation.
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Affiliation(s)
- Bhaskar K Chatterjee
- Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI 48109, USA
| | - Matthias C Truttmann
- Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI 48109, USA.,Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA.,Geriatrics Center, University of Michigan, Ann Arbor, MI 48109, USA
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Du J, Wrisberg MKV, Gulen B, Stahl M, Pett C, Hedberg C, Lang K, Schneider S, Itzen A. Rab1-AMPylation by Legionella DrrA is allosterically activated by Rab1. Nat Commun 2021; 12:460. [PMID: 33469029 PMCID: PMC7815794 DOI: 10.1038/s41467-020-20702-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 12/16/2020] [Indexed: 01/29/2023] Open
Abstract
Legionella pneumophila infects eukaryotic cells by forming a replicative organelle - the Legionella containing vacuole. During this process, the bacterial protein DrrA/SidM is secreted and manipulates the activity and post-translational modification (PTM) states of the vesicular trafficking regulator Rab1. As a result, Rab1 is modified with an adenosine monophosphate (AMP), and this process is referred to as AMPylation. Here, we use a chemical approach to stabilise low-affinity Rab:DrrA complexes in a site-specific manner to gain insight into the molecular basis of the interaction between the Rab protein and the AMPylation domain of DrrA. The crystal structure of the Rab:DrrA complex reveals a previously unknown non-conventional Rab-binding site (NC-RBS). Biochemical characterisation demonstrates allosteric stimulation of the AMPylation activity of DrrA via Rab binding to the NC-RBS. We speculate that allosteric control of DrrA could in principle prevent random and potentially cytotoxic AMPylation in the host, thereby perhaps ensuring efficient infection by Legionella.
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Affiliation(s)
- Jiqing Du
- Center for Integrated Protein Science Munich (CIPSM), Department of Chemistry, Technical University of Munich, Garching, 85748, Germany.,Center for Experimental Medicine, Institute of Biochemistry and Signal Transduction, Universitätsklinikum Hamburg-Eppendorf (UKE), Hamburg, 20246, Germany
| | - Marie-Kristin von Wrisberg
- Center for Integrated Protein Science Munich (CIPSM), Department of Chemistry, Technical University of Munich, Institute for Advanced Study, Garching, 85748, Germany
| | - Burak Gulen
- Center for Integrated Protein Science Munich (CIPSM), Department of Chemistry, Technical University of Munich, Garching, 85748, Germany.,Center for Experimental Medicine, Institute of Biochemistry and Signal Transduction, Universitätsklinikum Hamburg-Eppendorf (UKE), Hamburg, 20246, Germany
| | - Matthias Stahl
- Center for Integrated Protein Science Munich (CIPSM), Department of Chemistry, Technical University of Munich, Garching, 85748, Germany.,Science for Life Laboratory, Department of Oncology-Pathology, Karolinska Institutet, Box 1031, 171 21 Solna, Stockholm, Sweden
| | - Christian Pett
- Chemical Biology Center (KBC), Department of Chemistry, Umeå University, Linnaeus väg 10, 90187, Umeå, Sweden
| | - Christian Hedberg
- Chemical Biology Center (KBC), Department of Chemistry, Umeå University, Linnaeus väg 10, 90187, Umeå, Sweden
| | - Kathrin Lang
- Center for Integrated Protein Science Munich (CIPSM), Department of Chemistry, Technical University of Munich, Institute for Advanced Study, Garching, 85748, Germany.
| | - Sabine Schneider
- Center for Integrated Protein Science Munich (CIPSM), Department of Chemistry, Ludwig-Maximilians-University Munich, München, 81377, Germany.
| | - Aymelt Itzen
- Center for Integrated Protein Science Munich (CIPSM), Department of Chemistry, Technical University of Munich, Garching, 85748, Germany. .,Center for Experimental Medicine, Institute of Biochemistry and Signal Transduction, Universitätsklinikum Hamburg-Eppendorf (UKE), Hamburg, 20246, Germany. .,Center for Structural Systems Biology (CSSB), University Medical Centre Hamburg-Eppendorf (UKE), Hamburg, Germany.
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5
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Sreelatha A, Yee SS, Lopez VA, Park BC, Kinch LN, Pilch S, Servage KA, Zhang J, Jiou J, Karasiewicz-Urbańska M, Łobocka M, Grishin NV, Orth K, Kucharczyk R, Pawłowski K, Tomchick DR, Tagliabracci VS. Protein AMPylation by an Evolutionarily Conserved Pseudokinase. Cell 2018; 175:809-821.e19. [PMID: 30270044 DOI: 10.1016/j.cell.2018.08.046] [Citation(s) in RCA: 124] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 07/19/2018] [Accepted: 08/17/2018] [Indexed: 02/06/2023]
Abstract
Approximately 10% of human protein kinases are believed to be inactive and named pseudokinases because they lack residues required for catalysis. Here, we show that the highly conserved pseudokinase selenoprotein-O (SelO) transfers AMP from ATP to Ser, Thr, and Tyr residues on protein substrates (AMPylation), uncovering a previously unrecognized activity for a member of the protein kinase superfamily. The crystal structure of a SelO homolog reveals a protein kinase-like fold with ATP flipped in the active site, thus providing a structural basis for catalysis. SelO pseudokinases localize to the mitochondria and AMPylate proteins involved in redox homeostasis. Consequently, SelO activity is necessary for the proper cellular response to oxidative stress. Our results suggest that AMPylation may be a more widespread post-translational modification than previously appreciated and that pseudokinases should be analyzed for alternative transferase activities.
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Affiliation(s)
- Anju Sreelatha
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Samantha S Yee
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Victor A Lopez
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Brenden C Park
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Lisa N Kinch
- Howard Hughes Medical Institute, Dallas, TX 75390, USA
| | - Sylwia Pilch
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw 02-106, Poland
| | - Kelly A Servage
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Junmei Zhang
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jenny Jiou
- Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | | | - Małgorzata Łobocka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw 02-106, Poland; Faculty of Agriculture and Biology, Warsaw University of Life Sciences, Warsaw 02-776, Poland
| | - Nick V Grishin
- Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Howard Hughes Medical Institute, Dallas, TX 75390, USA; Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Kim Orth
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Howard Hughes Medical Institute, Dallas, TX 75390, USA; Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Roza Kucharczyk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw 02-106, Poland
| | - Krzysztof Pawłowski
- Faculty of Agriculture and Biology, Warsaw University of Life Sciences, Warsaw 02-776, Poland
| | - Diana R Tomchick
- Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Vincent S Tagliabracci
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA; Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
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Abstract
Posttranslational modifications are covalent changes made to proteins that typically alter the function or location of the protein. AMPylation is an emerging posttranslational modification that involves the addition of adenosine monophosphate (AMP) to a protein. Like other, more well-studied posttranslational modifications, AMPylation is predicted to regulate the activity of the modified target proteins. However, the scope of this modification both in bacteria and in eukaryotes remains to be fully determined. In this review, we provide an up to date overview of the known AMPylating enzymes, the regulation of these enzymes, and the effect of this modification on target proteins.
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Affiliation(s)
- Amanda K. Casey
- Department of Molecular Biology, University of Texas Southwestern Medical Center, 6000 Harry Hines Boulevard NA5.120F, Dallas, Texas 75390-9148, United States
| | - Kim Orth
- Department of Molecular Biology, University of Texas Southwestern Medical Center, 6000 Harry Hines Boulevard NA5.120F, Dallas, Texas 75390-9148, United States
- Howard Hughes Medical Institute, 6000 Harry Hines Boulevard NA5.120F, Dallas, Texas 75390-9148, United States
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Gavriljuk K, Schartner J, Seidel H, Dickhut C, Zahedi RP, Hedberg C, Kötting C, Gerwert K. Unraveling the Phosphocholination Mechanism of the Legionella pneumophila Enzyme AnkX. Biochemistry 2016; 55:4375-85. [PMID: 27404583 DOI: 10.1021/acs.biochem.6b00524] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The intracellular pathogen Legionella pneumophila infects lung macrophages and injects numerous effector proteins into the host cell to establish a vacuole for proliferation. The necessary interference with vesicular trafficking of the host is achieved by modulation of the function of Rab GTPases. The effector protein AnkX chemically modifies Rab1b and Rab35 by covalent phosphocholination of serine or threonine residues using CDP-choline as a donor. So far, the phosphoryl transfer mechanism and the relevance of observed autophosphocholination of AnkX remained disputable. We designed tailored caged compounds to make this type of enzymatic reaction accessible for time-resolved Fourier transform infrared difference spectroscopy. By combining spectroscopic and biochemical methods, we determined that full length AnkX is autophosphocholinated at Ser521, Thr620, and Thr943. However, autophosphocholination loses specificity for these sites in shortened constructs and does not appear to be relevant for the catalysis of the phosphoryl transfer. In contrast, transient phosphocholination of His229 in the conserved catalytic motif might exist as a short-lived reaction intermediate. Upon substrate binding, His229 is deprotonated and locked in this state, being rendered capable of a nucleophilic attack on the pyrophosphate moiety of the substrate. The proton that originated from His229 is transferred to a nearby carboxylic acid residue. Thus, our combined findings support a ping-pong mechanism involving phosphocholination of His229 and subsequent transfer of phosphocholine to the Rab GTPase. Our approach can be extended to the investigation of further nucleotidyl transfer reactions, which are currently of reemerging interest in regulatory pathways of host-pathogen interactions.
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Affiliation(s)
- Konstantin Gavriljuk
- Department of Biophysics, Ruhr-Universität Bochum , Universitätsstrasse 150, 44801 Bochum, Germany
| | - Jonas Schartner
- Department of Biophysics, Ruhr-Universität Bochum , Universitätsstrasse 150, 44801 Bochum, Germany
| | - Hans Seidel
- Department of Biophysics, Ruhr-Universität Bochum , Universitätsstrasse 150, 44801 Bochum, Germany
| | - Clarissa Dickhut
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V. , Otto-Hahn-Strasse 6b, 44227 Dortmund, Germany
| | - Rene P Zahedi
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V. , Otto-Hahn-Strasse 6b, 44227 Dortmund, Germany
| | - Christian Hedberg
- Department of Chemistry and Umeå Center for Microbial Research, Umeå University , SE-90187 Umeå, Sweden
| | - Carsten Kötting
- Department of Biophysics, Ruhr-Universität Bochum , Universitätsstrasse 150, 44801 Bochum, Germany
| | - Klaus Gerwert
- Department of Biophysics, Ruhr-Universität Bochum , Universitätsstrasse 150, 44801 Bochum, Germany
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Schartner J, Hoeck N, Güldenhaupt J, Mavarani L, Nabers A, Gerwert K, Kötting C. Chemical Functionalization of Germanium with Dextran Brushes for Immobilization of Proteins Revealed by Attenuated Total Reflection Fourier Transform Infrared Difference Spectroscopy. Anal Chem 2015; 87:7467-75. [PMID: 26102158 DOI: 10.1021/acs.analchem.5b01823] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Protein immobilization studied by attenuated total reflection Fourier transform infrared (ATR-FT-IR) difference spectroscopy is an emerging field enabling the study of proteins at atomic detail. Gold or glass surfaces are frequently used for protein immobilization. Here, we present an alternative method for protein immobilization on germanium. Because of its high refractive index and broad spectral window germanium is the best material for ATR-FT-IR spectroscopy of thin layers. So far, this technique was mainly used for protein monolayers, which lead to a limited signal-to-noise ratio. Further, undesired protein-protein interactions can occur in a dense layer. Here, the germanium surface was functionalized with thiols and stepwise a dextran brush was generated. Each step was monitored by ATR-FT-IR spectroscopy. We compared a 70 kDa dextran with a 500 kDa dextran regarding the binding properties. All surfaces were characterized by atomic force microscopy, revealing thicknesses between 40 and 110 nm. To analyze the capability of our system we utilized N-Ras on mono-NTA (nitrilotriacetic acid) functionalized dextran, and the amount of immobilized Ras corresponded to several monolayers. The protein stability and loading capacity was further improved by means of tris-NTA for immobilization. Small-molecule-induced changes were revealed with an over 3 times higher signal-to-noise ratio compared to monolayers. This improvement may allow the observation of very small and so far hidden changes in proteins upon stimulus. Furthermore, we immobilized green fluorescent protein (GFP) and mCherry simultaneously enabling an analysis of the surface by fluorescence microscopy. The absence of a Förster resonance energy transfer (FRET) signal demonstrated a large protein-protein distance, indicating an even distribution of the protein within the dextran.
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Affiliation(s)
- Jonas Schartner
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Nina Hoeck
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Jörn Güldenhaupt
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Laven Mavarani
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Andreas Nabers
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Klaus Gerwert
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Carsten Kötting
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
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Schröter G, Mann D, Kötting C, Gerwert K. Integration of Fourier Transform Infrared Spectroscopy, Fluorescence Spectroscopy, Steady-state Kinetics and Molecular Dynamics Simulations of Gαi1 Distinguishes between the GTP Hydrolysis and GDP Release Mechanism. J Biol Chem 2015; 290:17085-95. [PMID: 25979337 DOI: 10.1074/jbc.m115.651190] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Indexed: 11/06/2022] Open
Abstract
Gα subunits are central molecular switches in cells. They are activated by G protein-coupled receptors that exchange GDP for GTP, similar to small GTPase activation mechanisms. Gα subunits are turned off by GTP hydrolysis. For the first time we employed time-resolved FTIR difference spectroscopy to investigate the molecular reaction mechanisms of Gαi1. FTIR spectroscopy is a powerful tool that monitors reactions label free with high spatio-temporal resolution. In contrast to common multiple turnover assays, FTIR spectroscopy depicts the single turnover GTPase reaction without nucleotide exchange/Mg(2+) binding bias. Global fit analysis resulted in one apparent rate constant of 0.02 s(-1) at 15 °C. Isotopic labeling was applied to assign the individual phosphate vibrations for α-, β-, and γ-GTP (1243, 1224, and 1156 cm(-1), respectively), α- and β-GDP (1214 and 1134/1103 cm(-1), respectively), and free phosphate (1078/991 cm(-1)). In contrast to Ras · GAP catalysis, the bond breakage of the β-γ-phosphate but not the Pi release is rate-limiting in the GTPase reaction. Complementary common GTPase assays were used. Reversed phase HPLC provided multiple turnover rates and tryptophan fluorescence provided nucleotide exchange rates. Experiments were complemented by molecular dynamics simulations. This broad approach provided detailed insights at atomic resolution and allows now to identify key residues of Gαi1 in GTP hydrolysis and nucleotide exchange. Mutants of the intrinsic arginine finger (Gαi1-R178S) affected exclusively the hydrolysis reaction. The effect of nucleotide binding (Gαi1-D272N) and Ras-like/all-α interface coordination (Gαi1-D229N/Gαi1-D231N) on the nucleotide exchange reaction was furthermore elucidated.
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Affiliation(s)
- Grit Schröter
- From the Biophysics Department, Ruhr-University Bochum, 44801 Bochum, Germany
| | - Daniel Mann
- From the Biophysics Department, Ruhr-University Bochum, 44801 Bochum, Germany
| | - Carsten Kötting
- From the Biophysics Department, Ruhr-University Bochum, 44801 Bochum, Germany
| | - Klaus Gerwert
- From the Biophysics Department, Ruhr-University Bochum, 44801 Bochum, Germany
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Abstract
In the cell, proteins are frequently modified covalently at specific amino acids with post-translational modifications, leading to a diversification of protein functions and activities. Since the introduction of high-resolution mass spectrometry, new post-translational modifications are constantly being discovered. One particular modification is the adenylylation of mammalian proteins. In adenylylation, adenosine triphosphate (ATP) is utilized to attach an adenosine monophosphate at protein threonine or tyrosine residues via a phosphodiester linkage. Adenylylation is particularly interesting in the context of infections by bacterial pathogens during which mammalian proteins are manipulated through AMP attachment via secreted bacterial factors. In this review, we summarize the role and regulation of enzymatic adenylylation and the mechanisms of catalysis. We also refer to recent methods for the detection of adenylylated proteins by modification-specific antibodies, ATP analogues equipped with chemical handles, and mass spectrometry approaches. Additionally, we review screening approaches for inhibiting adenylylation and briefly discuss related modifications such as phosphocholination and phosphorylation.
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Affiliation(s)
- Christian Hedberg
- Chemical
Biology Center (KBC), Institute of Chemistry, Umeå University, Umeå, 90187, Sweden
- Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Dortmund 44227, Germany
| | - Aymelt Itzen
- Center
for Integrated Protein Science Munich, Chemistry Department, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany
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