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Tannenberg R, Paul M, Röder B, Gande SL, Sreeramulu S, Saxena K, Richter C, Schwalbe H, Swart C, Weller MG. Chemiluminescence Biosensor for the Determination of Cardiac Troponin I (cTnI). BIOSENSORS 2023; 13:455. [PMID: 37185530 PMCID: PMC10136549 DOI: 10.3390/bios13040455] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 03/24/2023] [Accepted: 03/29/2023] [Indexed: 05/17/2023]
Abstract
Cardiac vascular diseases, especially acute myocardial infarction (AMI), are one of the leading causes of death worldwide. Therefore cardio-specific biomarkers such as cardiac troponin I (cTnI) play an essential role in the field of diagnostics. In order to enable rapid and accurate measurement of cTnI with the potential of online measurements, a chemiluminescence-based immunosensor is presented as a proof of concept. A flow cell was designed and combined with a sensitive CMOS camera allowing sensitive optical readout. In addition, a microfluidic setup was established, which achieved selective and quasi-online cTnI determination within ten minutes. The sensor was tested with recombinant cTnI in phosphate buffer and demonstrated cTnI measurements in the concentration range of 2-25 µg/L. With the optimized system, a limit of detection (LoD) of 0.6 µg/L (23 pmol/L) was achieved. Furthermore, the selectivity of the immunosensor was investigated with other recombinant proteins, such as cTnT, and cTnC, at a level of 16 µg/L. No cross-reactivity could be observed. Measurements with diluted blood plasma and serum resulted in an LoD of 60 µg/L (2.4 nmol/L) and 70 µg/L (2.9 nmol/L), respectively.
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Affiliation(s)
- Robert Tannenberg
- Federal Institute for Materials Research and Testing (BAM), Richard-Willstätter-Strasse 11, 12489 Berlin, Germany
| | - Martin Paul
- Federal Institute for Materials Research and Testing (BAM), Richard-Willstätter-Strasse 11, 12489 Berlin, Germany
| | - Bettina Röder
- Federal Institute for Materials Research and Testing (BAM), Richard-Willstätter-Strasse 11, 12489 Berlin, Germany
| | - Santosh L Gande
- Goethe-University Frankfurt, Max-von-Laue-Str. 7, 60438 Frankfurt am Main, Germany
| | - Sridhar Sreeramulu
- Goethe-University Frankfurt, Max-von-Laue-Str. 7, 60438 Frankfurt am Main, Germany
| | - Krishna Saxena
- Goethe-University Frankfurt, Max-von-Laue-Str. 7, 60438 Frankfurt am Main, Germany
| | - Christian Richter
- Goethe-University Frankfurt, Max-von-Laue-Str. 7, 60438 Frankfurt am Main, Germany
| | - Harald Schwalbe
- Goethe-University Frankfurt, Max-von-Laue-Str. 7, 60438 Frankfurt am Main, Germany
| | - Claudia Swart
- National Metrology Institute (PTB), Bundesallee 100, 38116 Braunschweig, Germany
| | - Michael G Weller
- Federal Institute for Materials Research and Testing (BAM), Richard-Willstätter-Strasse 11, 12489 Berlin, Germany
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2
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Olivieri C, Walker C, Manu V, Porcelli F, Taylor SS, Bernlohr DA, Veglia G. An NMR portrait of functional and dysfunctional allosteric cooperativity in cAMP-dependent protein kinase A. FEBS Lett 2023; 597:1055-1072. [PMID: 36892429 PMCID: PMC11334100 DOI: 10.1002/1873-3468.14610] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 03/10/2023]
Abstract
The cAMP-dependent protein kinase A (PKA) is the archetypical eukaryotic kinase. The catalytic subunit (PKA-C) structure is highly conserved among the AGC-kinase family. PKA-C is a bilobal enzyme with a dynamic N-lobe, harbouring the Adenosine-5'-triphosphate (ATP) binding site and a more rigid helical C-lobe. The substrate-binding groove resides at the interface of the two lobes. A distinct feature of PKA-C is the positive binding cooperativity between nucleotide and substrate. Several PKA-C mutations lead to the development of adenocarcinomas, myxomas, and other rare forms of liver tumours. Nuclear magnetic resonance (NMR) spectroscopy shows that these mutations disrupt the allosteric communication between the two lobes, causing a drastic decrease in binding cooperativity. The loss of cooperativity correlates with changes in substrate fidelity and reduced kinase affinity for the endogenous protein kinase inhibitor (PKI). The similarity between PKI and the inhibitory sequence of the kinase regulatory subunits suggests that the overall mechanism of regulation of the kinase may be disrupted. We surmise that a reduced or obliterated cooperativity may constitute a common trait for both orthosteric and allosteric mutations of PKA-C that may lead to dysregulation and disease.
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Affiliation(s)
- Cristina Olivieri
- Department of Biochemistry, Molecular Biology & Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Caitlin Walker
- Department of Biochemistry, Molecular Biology & Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - V.S. Manu
- Department of Biochemistry, Molecular Biology & Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Fernando Porcelli
- Department for Innovation in Biological, Agrofood and Forest Systems, University of Tuscia, 01100 Viterbo, Italy
| | - Susan S. Taylor
- Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA 92093
- Department of Pharmacology, University of California at San Diego, La Jolla, CA 92093
| | - David A. Bernlohr
- Department of Biochemistry, Molecular Biology & Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Gianluigi Veglia
- Department of Biochemistry, Molecular Biology & Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
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3
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Tong MHG, Jeeves M, Rajesh S, Ludwig C, Lenoir M, Kumar J, McClelland DM, Berditchevski F, Hubbard JA, Kenyon C, Butterworth S, Knapp S, Overduin M. Backbone resonance assignments of the catalytic and regulatory domains of Ca 2+/calmodulin-dependent protein kinase 1D. BIOMOLECULAR NMR ASSIGNMENTS 2020; 14:221-225. [PMID: 32535836 PMCID: PMC7462902 DOI: 10.1007/s12104-020-09950-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
The CaMK subfamily of Ser/Thr kinases are regulated by calmodulin interactions with their C-terminal regions. They are exemplified by Ca2+/calmodulin dependent protein kinase 1δ which is known as CaMK1D, CaMKIδ or CKLiK. CaMK1D mediates intracellular signalling downstream of Ca2+ influx and thereby exhibits amplifications of Ca2+signals and polymorphisms that have been implicated in breast cancer and diabetes. Here we report the backbone 1H, 13C, 15N assignments of the 38 kDa human CaMK1D protein in its free state, including both the canonical bi-lobed kinase fold as well as the autoinhibitory and calmodulin binding domains.
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Affiliation(s)
- Michael H G Tong
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Mark Jeeves
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Sundaresan Rajesh
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Christian Ludwig
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Marc Lenoir
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Jitendra Kumar
- Department of Biochemistry, University of Alberta, Edmonton, AB, T6G 2H7, Canada
| | - Darren M McClelland
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Fedor Berditchevski
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Julia A Hubbard
- Computational, Analytical and Structural Sciences, GlaxoSmithKline, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, UK
| | - Colin Kenyon
- Faculty of Medicine and Health Sciences, Stellenbosch University, Francie Van Zijl Dr, Parow, Cape Town, 7505, South Africa
| | - Sam Butterworth
- Division of Pharmacy and Optometry, School of Health Sciences, Manchester Academic Health Sciences Centre, University of Manchester, Manchester, M13 9PL, UK
| | - Stefan Knapp
- Structural Genomics Consortium and Buchmann Institute for Molecular Life Sciences, Institute for Pharmaceutical Chemistry, Johann Wolfgang Goethe-University, Max-von-Laue-Straße 9, 60438, Frankfurt am Main, Germany
| | - Michael Overduin
- Department of Biochemistry, University of Alberta, Edmonton, AB, T6G 2H7, Canada.
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4
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Gao SX, Guo J, Fan GQ, Qiao Y, Zhao RQ, Yang XJ. ZAG alleviates HFD-induced insulin resistance accompanied with decreased lipid depot in skeletal muscle in mice. J Lipid Res 2018; 59:2277-2286. [PMID: 30318474 PMCID: PMC6277152 DOI: 10.1194/jlr.m082180] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 09/24/2018] [Indexed: 12/25/2022] Open
Abstract
Over the past two decades, intramuscular lipids have been viewed as a cause of insulin resistance due to their ability to suppress insulin-stimulated glucose uptake in skeletal muscle. Zinc-α2-glycoprotein (ZAG) is an adipokine involved in lipolysis of white adipose tissue (WAT). To investigate the action of ZAG on insulin resistance induced by a high-fat diet (HFD), which affects the intramuscular fat, mice were divided into three groups, normal diet, HFD, and ZAG treatment under HFD (HFZ). The results showed that the insulin sensitivity of ZAG-treated mice was significantly improved. The body weight, WAT weight, and intramuscular fat were significantly decreased in the HFZ group compared with the HFD group. The lipolytic enzymes, including phosphorylation of hormone-sensitive lipase and adipose triglyceride lipase, were significantly upregulated in the skeletal muscle of mice that received the ZAG treatment compared with the HFD group. Insulin signaling proteins, such as phosphorylation of insulin receptor substrate 1 and cell membrane glucose transporter type 4, were also significantly increased in the skeletal muscle of the ZAG-treated group. Furthermore, a metabolic rate study showed that ZAG overexpression increases the respiratory exchange ratio and heat production. In vitro, ZAG treatment promotes glucose uptake and decreases intracellular lipids in C2C12 myotubes. Taken together, these data showed that overexpression of ZAG alleviates HFD-induced insulin resistance in mice, along with decreasing the lipid content of skeletal muscle.
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Affiliation(s)
- Shi-Xing Gao
- Key Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
| | - Jun Guo
- Key Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
| | - Guo-Qiang Fan
- Key Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
| | - Yu Qiao
- Key Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
| | - Ru-Qian Zhao
- Key Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
| | - Xiao-Jing Yang
- Key Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
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5
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Larsen EK, Olivieri C, Walker C, V S M, Gao J, Bernlohr DA, Tonelli M, Markley JL, Veglia G. Probing Protein-Protein Interactions Using Asymmetric Labeling and Carbonyl-Carbon Selective Heteronuclear NMR Spectroscopy. Molecules 2018; 23:E1937. [PMID: 30081441 PMCID: PMC6205158 DOI: 10.3390/molecules23081937] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 07/23/2018] [Accepted: 07/25/2018] [Indexed: 11/23/2022] Open
Abstract
Protein-protein interactions (PPIs) regulate a plethora of cellular processes and NMR spectroscopy has been a leading technique for characterizing them at the atomic resolution. Technically, however, PPIs characterization has been challenging due to multiple samples required to characterize the hot spots at the protein interface. In this paper, we review our recently developed methods that greatly simplify PPI studies, which minimize the number of samples required to fully characterize residues involved in the protein-protein binding interface. This original strategy combines asymmetric labeling of two binding partners and the carbonyl-carbon label selective (CCLS) pulse sequence element implemented into the heteronuclear single quantum correlation (¹H-15N HSQC) spectra. The CCLS scheme removes signals of the J-coupled 15N⁻13C resonances and records simultaneously two individual amide fingerprints for each binding partner. We show the application to the measurements of chemical shift correlations, residual dipolar couplings (RDCs), and paramagnetic relaxation enhancements (PRE). These experiments open an avenue for further modifications of existing experiments facilitating the NMR analysis of PPIs.
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Affiliation(s)
- Erik K Larsen
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Cristina Olivieri
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Caitlin Walker
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Manu V S
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Jiali Gao
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
| | - David A Bernlohr
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Marco Tonelli
- National Magnetic Resonance Facility at Madison, Madison, WI 53706, USA.
| | - John L Markley
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA.
| | - Gianluigi Veglia
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
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6
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Wienen-Schmidt B, Jonker HRA, Wulsdorf T, Gerber HD, Saxena K, Kudlinzki D, Sreeramulu S, Parigi G, Luchinat C, Heine A, Schwalbe H, Klebe G. Paradoxically, Most Flexible Ligand Binds Most Entropy-Favored: Intriguing Impact of Ligand Flexibility and Solvation on Drug–Kinase Binding. J Med Chem 2018; 61:5922-5933. [DOI: 10.1021/acs.jmedchem.8b00105] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Barbara Wienen-Schmidt
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
| | - Hendrik R. A. Jonker
- Institut für Organische Chemie und Chemische Biologie, Johann Wolfgang Goethe-Universität Frankfurt, Max-von-Laue-Straße 7, N160-3.14, 60438 Frankfurt am Main, Germany
| | - Tobias Wulsdorf
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
| | - Hans-Dieter Gerber
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
| | - Krishna Saxena
- Institut für Organische Chemie und Chemische Biologie, Johann Wolfgang Goethe-Universität Frankfurt, Max-von-Laue-Straße 7, N160-3.14, 60438 Frankfurt am Main, Germany
| | - Denis Kudlinzki
- Institut für Organische Chemie und Chemische Biologie, Johann Wolfgang Goethe-Universität Frankfurt, Max-von-Laue-Straße 7, N160-3.14, 60438 Frankfurt am Main, Germany
| | - Sridhar Sreeramulu
- Institut für Organische Chemie und Chemische Biologie, Johann Wolfgang Goethe-Universität Frankfurt, Max-von-Laue-Straße 7, N160-3.14, 60438 Frankfurt am Main, Germany
| | - Giacomo Parigi
- Magnetic Resonance Center (CERM/CIRMMP) and Department of Chemistry, University of Florence, Via Luigi Sacconi 6, 50019, Sesto Fiorentino, Italy
| | - Claudio Luchinat
- Magnetic Resonance Center (CERM/CIRMMP) and Department of Chemistry, University of Florence, Via Luigi Sacconi 6, 50019, Sesto Fiorentino, Italy
| | - Andreas Heine
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
| | - Harald Schwalbe
- Institut für Organische Chemie und Chemische Biologie, Johann Wolfgang Goethe-Universität Frankfurt, Max-von-Laue-Straße 7, N160-3.14, 60438 Frankfurt am Main, Germany
| | - Gerhard Klebe
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
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7
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Pitsawong W, Buosi V, Otten R, Agafonov RV, Zorba A, Kern N, Kutter S, Kern G, Pádua RA, Meniche X, Kern D. Dynamics of human protein kinase Aurora A linked to drug selectivity. eLife 2018; 7:36656. [PMID: 29901437 PMCID: PMC6054532 DOI: 10.7554/elife.36656] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 06/12/2018] [Indexed: 12/24/2022] Open
Abstract
Protein kinases are major drug targets, but the development of highly-selective inhibitors has been challenging due to the similarity of their active sites. The observation of distinct structural states of the fully-conserved Asp-Phe-Gly (DFG) loop has put the concept of conformational selection for the DFG-state at the center of kinase drug discovery. Recently, it was shown that Gleevec selectivity for the Tyr-kinase Abl was instead rooted in conformational changes after drug binding. Here, we investigate whether protein dynamics after binding is a more general paradigm for drug selectivity by characterizing the binding of several approved drugs to the Ser/Thr-kinase Aurora A. Using a combination of biophysical techniques, we propose a universal drug-binding mechanism, that rationalizes selectivity, affinity and long on-target residence time for kinase inhibitors. These new concepts, where protein dynamics in the drug-bound state plays the crucial role, can be applied to inhibitor design of targets outside the kinome. Protein kinases are a family of enzymes found in all living organisms. These enzymes help to control many biological processes, including cell division. When particular protein kinases do not work correctly, cells may start to divide uncontrollably, which can lead to cancer. One example is the kinase Aurora A, which is over-active in many common human cancers. As a result, researchers are currently trying to design drugs that reduce the activity of Aurora A in the hope that these could form new anticancer treatments. In general, drugs are designed to be as specific in their action as possible to reduce the risk of harmful side effects to the patient. Designing a drug that affects a single protein kinase, however, is difficult because there are hundreds of different kinases in the body, all with similar structures. Because drugs often work by binding to specific structural features, a drug that targets one protein kinase can often alter the activity of a large number of others too. Gleevec is a successful anti-leukemia drug that specifically works on one target kinase, producing minimal side effects. It was recently discovered that the drug works through a phenomenon called ‘induced fit’. This means that after the drug binds it causes a change in the enzyme’s overall shape that alters the activity of the enzyme. The shape change is complex, and so even small structural differences can change the effect of a particular drug. Do other drugs that target other protein kinases also produce induced fit effects? To find out, Pitsawong, Buosi, Otten, Agafonov et al. studied how three anti-cancer drugs interact with Aurora A: two drugs specifically designed to switch off Aurora A, and Gleevec (which does not target Aurora A). The two drugs that specifically target Aurora A were thought to work by targeting one structural feature of the enzyme. However, the biochemical and biophysical experiments performed by Pitsawong et al. revealed that these drugs instead work through an induced fit effect. By contrast, Gleevec did not trigger an induced fit on Aurora A and so bound less tightly to it. In light of these results, Pitsawong et al. suggest that future efforts to design drugs that target protein kinases should focus on exploiting the induced fit process. This will require more research into the structure of particular kinases.
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Affiliation(s)
- Warintra Pitsawong
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Vanessa Buosi
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Renee Otten
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Roman V Agafonov
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Adelajda Zorba
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Nadja Kern
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Steffen Kutter
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Gunther Kern
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Ricardo Ap Pádua
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
| | - Xavier Meniche
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, United States
| | - Dorothee Kern
- Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States
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8
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Senga Y, Akizuki K, Katayama S, Shigeri Y, Kameshita I, Ishida A, Sueyoshi N. High-performance CaMKI: A highly active and stable form of CaMKIδ produced by high-level soluble expression in Escherichia coli. Biochem Biophys Res Commun 2016; 475:277-82. [DOI: 10.1016/j.bbrc.2016.05.060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Accepted: 05/11/2016] [Indexed: 10/21/2022]
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9
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Kudlinzki D, Linhard VL, Saxena K, Sreeramulu S, Gande S, Schieborr U, Dreyer M, Schwalbe H. High-resolution crystal structure of cAMP-dependent protein kinase from Cricetulus griseus. ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS 2015; 71:1088-93. [PMID: 26249705 DOI: 10.1107/s2053230x1501242x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 06/29/2015] [Indexed: 03/31/2023]
Abstract
Protein kinases (PKs) are dynamic regulators of numerous cellular processes. Their phosphorylation activity is determined by the conserved kinase core structure, which is maintained by the interaction and dynamics with associated domains or interacting proteins. The prototype enzyme for investigations to understand the activity and regulation of PKs is the catalytic subunit of cAMP-dependent protein kinase (PKAc). Major effects of functional regulation and ligand binding are driven by only minor structural modulations in protein-protein interactions. In order to resolve such minor structural differences, very high resolution structures are required. Here, the high-resolution X-ray structure of PKAc from Cricetulus griseus is reported.
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Affiliation(s)
- Denis Kudlinzki
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt, Germany
| | - Verena L Linhard
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt, Germany
| | - Krishna Saxena
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt, Germany
| | - Sridhar Sreeramulu
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt, Germany
| | - Santosh Gande
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt, Germany
| | - Ulrich Schieborr
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt, Germany
| | - Matthias Dreyer
- R&D, Sanofi, Industriepark Hoechst Building G838, 65926 Frankfurt, Germany
| | - Harald Schwalbe
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt, Germany
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10
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Ma J, He Y, Hu Z, Xu W, Xia J, Guo C, Lin S, Chen C, Wu C, Zhang J. Characterization of the third SERK gene in pineapple (Ananas comosus) and analysis of its expression and autophosphorylation activity in vitro. Genet Mol Biol 2014; 37:530-9. [PMID: 25249776 PMCID: PMC4171775 DOI: 10.1590/s1415-47572014000400009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 04/15/2014] [Indexed: 11/21/2022] Open
Abstract
Two somatic embryogenesis receptor-like kinase genes (identified as AcSERK1 and AcSERK2) have previously been characterized from pineapple (Ananas comosus). In this work, we describe the characterization of a third gene (AcSERK3) in this family. AcSERK3 had all the characteristic domains and shared extensive sequence homology with other plant SERKs. AcSERK3 expression was studied by in situ hybridization and quantitative real-time PCR to analyze its function. Intense in situ hybridization signals were observed only in single competent cells and competent cell clusters; no hybridization signal was detected in the subsequent stages of somatic embryogenesis. AcSERK3 was highly expressed in embryogenic callus compared to other organs, e.g., 20–80 fold more than in anther but similar to that of non-embryogenic callus, which was 20–50 fold that of anther. AcSERK3 expression in root was 80 fold higher than in anther and the highest amongst all organs tested. These results indicate that AcSERK3 plays an important role in callus proliferation and root development. His-tagged AcSERK3 protein was successfully expressed and the luminescence of His6-AcSERK3 protein was only ∼5% of that of inactivated AcSERK3 protein and reaction buffer without protein, and 11.3% of that of an extract of host Escherichia coli pET-30a. This finding confirmed that the AcSERK3 fusion protein had autophosphorylation activity.
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Affiliation(s)
- Jun Ma
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China . ; College of Landscape Architecture , Sichuan Agricultural University , Chengdu , China
| | - Yehua He
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China
| | - Zhongyi Hu
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China
| | - Wentian Xu
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China
| | - Jingxian Xia
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China
| | - Cuihong Guo
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China
| | - Shunquan Lin
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China
| | - Chengjie Chen
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China
| | - Chenghou Wu
- Horticultural Biotechnology College , South China Agricultural University , Guangzhou , China
| | - Junli Zhang
- College of Landscape Architecture , Sichuan Agricultural University , Chengdu , China
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11
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Vajpai N, Schott AK, Vogtherr M, Breeze AL. NMR backbone assignments of the tyrosine kinase domain of human fibroblast growth factor receptor 1. BIOMOLECULAR NMR ASSIGNMENTS 2014; 8:85-8. [PMID: 23325512 DOI: 10.1007/s12104-013-9458-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Accepted: 01/04/2013] [Indexed: 05/20/2023]
Abstract
Members of the fibroblast growth factor receptor tyrosine kinase family (FGFR1-4) play an important role in many signalling cascades. Although tightly regulated, aberrant activity of these enzymes may lead to, or become features of, disease pathologies including cancer. FGFR isoforms have been the subject of drug discovery programmes, with a number of kinase-domain inhibitors in pre-clinical and clinical development. Here, we present the first (83% complete) backbone resonance assignments of apo-FGFR1 kinase.
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Affiliation(s)
- Navratna Vajpai
- Protein Structure and Biophysics, AstraZeneca R&D, Alderley Park, Macclesfield, Cheshire, SK10 4TG, UK
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12
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Britton D, Zen Y, Quaglia A, Selzer S, Mitra V, Lößner C, Jung S, Böhm G, Schmid P, Prefot P, Hoehle C, Koncarevic S, Gee J, Nicholson R, Ward M, Castellano L, Stebbing J, Zucht HD, Sarker D, Heaton N, Pike I. Quantification of pancreatic cancer proteome and phosphorylome: indicates molecular events likely contributing to cancer and activity of drug targets. PLoS One 2014; 9:e90948. [PMID: 24670416 PMCID: PMC3966770 DOI: 10.1371/journal.pone.0090948] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 02/05/2014] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE LC-MS/MS phospho-proteomics is an essential technology to help unravel the complex molecular events that lead to and propagate cancer. We have developed a global phospho-proteomic workflow to determine activity of signaling pathways and drug targets in pancreatic cancer tissue for clinical application. METHODS Peptides resulting from tryptic digestion of proteins extracted from frozen tissue of pancreatic ductal adenocarcinoma and background pancreas (n = 12), were labelled with tandem mass tags (TMT 8-plex), separated by strong cation exchange chromatography, then were analysed by LC-MS/MS directly or first enriched for phosphopeptides using IMAC and TiO2, prior to analysis. In-house, commercial and freeware bioinformatic platforms were used to identify relevant biological events from the complex dataset. RESULTS Of 2,101 proteins identified, 152 demonstrated significant difference in abundance between tumor and non-tumor tissue. They included proteins that are known to be up-regulated in pancreatic cancer (e.g. Mucin-1), but the majority were new candidate markers such as HIPK1 & MLCK. Of the 6,543 unique phosphopeptides identified (6,284 unique phosphorylation sites), 635 showed significant regulation, particularly those from proteins involved in cell migration (Rho guanine nucleotide exchange factors & MRCKα) and formation of focal adhesions. Activator phosphorylation sites on FYN, AKT1, ERK2, HDAC1 and other drug targets were found to be highly modulated (≥2 fold) in different cases highlighting their predictive power. CONCLUSION Here we provided critical information enabling us to identify the common and unique molecular events likely contributing to cancer in each case. Such information may be used to help predict more bespoke therapy suitable for an individual case.
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Affiliation(s)
| | - Yoh Zen
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
| | - Alberto Quaglia
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
| | | | | | | | | | - Gitte Böhm
- Proteome Sciences plc, Cobham, United Kingdom
| | | | | | | | | | - Julia Gee
- Cardiff School of Pharmacy & Pharmaceutical Sciences, Cardiff University, Cardiff, United Kingdom
| | - Robert Nicholson
- Cardiff School of Pharmacy & Pharmaceutical Sciences, Cardiff University, Cardiff, United Kingdom
| | | | - Leandro Castellano
- Faculty of Medicine, Department of Surgery & Cancer, Imperial College, London, United Kingdom
| | - Justin Stebbing
- Faculty of Medicine, Department of Surgery & Cancer, Imperial College, London, United Kingdom
| | | | - Debashis Sarker
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
| | - Nigel Heaton
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
| | - Ian Pike
- Proteome Sciences plc, Cobham, United Kingdom
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13
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Hari SB, Merritt EA, Maly DJ. Sequence determinants of a specific inactive protein kinase conformation. ACTA ACUST UNITED AC 2014; 20:806-15. [PMID: 23790491 DOI: 10.1016/j.chembiol.2013.05.005] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 04/18/2013] [Accepted: 05/09/2013] [Indexed: 02/07/2023]
Abstract
Only a small percentage of protein kinases have been shown to adopt a distinct inactive ATP-binding site conformation, called the Asp-Phe-Gly-out (DFG-out) conformation. Given the high degree of homology within this enzyme family, we sought to understand the basis of this disparity on a sequence level. We identified two residue positions that sensitize mitogen-activated protein kinases (MAPKs) to inhibitors that stabilize the DFG-out inactive conformation. After characterizing the structure and dynamics of an inhibitor-sensitive MAPK mutant, we demonstrated the generality of this strategy by sensitizing a kinase (apoptosis signal-regulating kinase 1) not in the MAPK family to several DFG-out stabilizing ligands, using the same residue positions. The use of specific inactive conformations may aid the study of noncatalytic roles of protein kinases, such as binding partner interactions and scaffolding effects.
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Affiliation(s)
- Sanjay B Hari
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
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14
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Izvolski A, Järv J, Kuznetsov A. Computer modeling of the dynamic properties of the cAMP-dependent protein kinase catalytic subunit. Comput Biol Chem 2013; 47:66-70. [DOI: 10.1016/j.compbiolchem.2013.06.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 06/18/2013] [Accepted: 06/18/2013] [Indexed: 10/26/2022]
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15
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Nielsen G, Jonker HRA, Vajpai N, Grzesiek S, Schwalbe H. Kinase in Motion: Insights into the Dynamic Nature of p38α by High-Pressure NMR Spectroscopic Studies. Chembiochem 2013; 14:1799-806. [DOI: 10.1002/cbic.201300170] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Indexed: 11/11/2022]
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16
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Jin Y, Cliff MJ, Baxter NJ, Dannatt HRW, Hounslow AM, Bowler MW, Blackburn GM, Waltho JP. Charge-Balanced Metal Fluoride Complexes for Protein Kinase A with Adenosine Diphosphate and Substrate Peptide SP20. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204266] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Jin Y, Cliff MJ, Baxter NJ, Dannatt HRW, Hounslow AM, Bowler MW, Blackburn GM, Waltho JP. Charge-balanced metal fluoride complexes for protein kinase A with adenosine diphosphate and substrate peptide SP20. Angew Chem Int Ed Engl 2012; 51:12242-5. [PMID: 23125010 DOI: 10.1002/anie.201204266] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 10/10/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Yi Jin
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK
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18
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Yang GX, Li X, Snyder M. Investigating metabolite-protein interactions: an overview of available techniques. Methods 2012; 57:459-66. [PMID: 22750303 PMCID: PMC3448827 DOI: 10.1016/j.ymeth.2012.06.013] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Revised: 06/18/2012] [Accepted: 06/21/2012] [Indexed: 12/18/2022] Open
Abstract
Metabolites comprise the molar majority of chemical substances in living cells, and metabolite-protein interactions are expected to be quite common. Many interactions have already been identified and have been shown to be involved in the regulation of different types of cellular processes including signaling events, enzyme activities, protein localizations and interactions. Recent technological advances have greatly facilitated the detection of metabolite-protein interactions at high sensitivity and some of these have been applied on a large scale. In this manuscript, we review the available in vitro, in silico and in vivo technologies for mapping small-molecule-protein interactions. Although some of these were developed for drug-protein interactions they can be applied for mapping metabolite-protein interactions. Information gained from the use of these approaches can be applied to the manipulation of cellular processes and therapeutic applications.
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Affiliation(s)
- Grace Xiaolu Yang
- Department of Genetics, Stanford University, Stanford, CA
- Department of Chemistry, Stanford University, Stanford CA
| | - Xiyan Li
- Department of Genetics, Stanford University, Stanford, CA
| | - Michael Snyder
- Department of Genetics, Stanford University, Stanford, CA
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19
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Lee Y, Zeng H, Mazur A, Wegstroth M, Carlomagno T, Reese M, Lee D, Becker S, Griesinger C, Hilty C. Hyperpolarized binding pocket nuclear Overhauser effect for determination of competitive ligand binding. Angew Chem Int Ed Engl 2012; 51:5179-82. [PMID: 22499357 DOI: 10.1002/anie.201201003] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Youngbok Lee
- Center for Biological NMR, Department of Chemistry, Texas A&M University, College Station, TX 77843, USA
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20
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Lee Y, Zeng H, Mazur A, Wegstroth M, Carlomagno T, Reese M, Lee D, Becker S, Griesinger C, Hilty C. Hyperpolarized Binding Pocket Nuclear Overhauser Effect for Determination of Competitive Ligand Binding. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201201003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Hereng TH, Backe PH, Kahmann J, Scheich C, Bjørås M, Skålhegg BS, Rosendal KR. Structure and function of the human sperm-specific isoform of protein kinase A (PKA) catalytic subunit Cα2. J Struct Biol 2012; 178:300-10. [PMID: 22504716 DOI: 10.1016/j.jsb.2012.03.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 03/30/2012] [Accepted: 03/31/2012] [Indexed: 10/28/2022]
Abstract
Protein kinase A (PKA) exists as several tissue-specific isoforms that through phosphorylation of serine and threonine residues of substrate proteins act as key regulators of a number of cellular processes. We here demonstrate that the human sperm-specific isoform of PKA named Cα2 is important for sperm motility and thus male fertility. Furthermore, we report on the first three-dimensional crystal structure of human apo Cα2 to 2.1 Å. Apo Cα2 displays an open conformation similar to the well-characterized apo structure of murine Cα1. The asymmetric unit contains two molecules and the core of the small lobe is rotated by almost 13° in the A molecule relative to the B molecule. In addition, a salt bridge between Lys72 and Glu91 was observed for Cα2 in the apo-form, a conformation previously found only in dimeric or ternary complexes of Cα1. Human Cα2 and Cα1 share primary structure with the exception of the amino acids at the N-terminus coded for by an alternative exon 1. The N-terminal glycine of Cα1 is myristoylated and this aliphatic chain anchors the N-terminus to an intramolecular hydrophobic pocket. Cα2 cannot be myristoylated and the crystal structure revealed that the equivalent hydrophobic pocket is unoccupied and exposed. Nuclear magnetic resonance (NMR) spectroscopy further demonstrated that detergents with hydrophobic moieties of different lengths can bind deep into this uncovered pocket. Our findings indicate that Cα2 through the hydrophobic pocket has the ability to bind intracellular targets in the sperm cell, which may modulate protein stability, activity and/or cellular localization.
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Abstract
NMR analyses of the structure, dynamics, and interactions of the Src family kinases (SFKs) have been hindered by the limited ability to obtain sufficient amounts of properly folded, soluble protein from bacterial expression systems, to allow these studies to be performed in an economically viable manner. In this chapter, we detail our attempts to overcome these difficulties using the catalytic domain (SrcCD) of c-Src, the prototypical SFK, as an illustrative example. We describe in detail two general methods to express and purify SrcCD from Escherichia coli expression systems in both fully active wild-type and kinase-deficient mutant forms, allowing the efficient and cost-effective labeling by NMR-active isotopes for solution NMR studies.
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23
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Assignment of backbone resonances in a eukaryotic protein kinase - ERK2 as a representative example. Methods Mol Biol 2012; 831:359-68. [PMID: 22167683 DOI: 10.1007/978-1-61779-480-3_19] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
A first step toward the analysis of the structure, dynamics, and interactions of proteins by NMR is obtaining an acceptable level of resonance assignments. This process is nontrivial in most eukaryotic kinases given their size and suboptimal behavior in solution. Using inactive ERK2 as a representative example, we describe the procedures we utilized to achieve a significant degree of completeness of backbone resonance assignment.
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24
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Nielsen G, Schwalbe H. NMR spectroscopic investigations of the activated p38α mitogen-activated protein kinase. Chembiochem 2011; 12:2599-607. [PMID: 22012687 DOI: 10.1002/cbic.201100527] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Indexed: 11/11/2022]
Abstract
Phosphorylation of protein kinases is a central mechanism involved in numerous cellular regulatory circuits, both in prokaryotic and eukaryotic cells. An understanding of the structural and functional consequences of protein phosphorylation is of considerable importance for the design of selective, small-molecule kinase inhibitors. NMR spectroscopy is a central method to support structure-based drug design. Here, we present the NMR assignment of the activated p38α kinase and compare it to the NMR assignment of unphosphorylated p38α. Conformational changes in solution induced by activation can be located to the activation loop, an adjacent loop, and an insert part of the polypeptide chain that is specific for the family of mitogen-activated kinases. Deuterium-exchange experiments additionally revealed differences in exchange behavior for two residues in an alanine-rich helix-loop motif that becomes more flexible upon binding of an ATP analogue and a substrate peptide.
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Affiliation(s)
- Gerd Nielsen
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe University, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
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25
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Campos-Olivas R, Marenchino M, Scapozza L, Gervasio FL. Backbone assignment of the tyrosine kinase Src catalytic domain in complex with imatinib. BIOMOLECULAR NMR ASSIGNMENTS 2011; 5:221-224. [PMID: 21523440 DOI: 10.1007/s12104-011-9304-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Accepted: 04/14/2011] [Indexed: 05/30/2023]
Abstract
The Src tyrosine kinase is the paradigm of an oncogenic kinase, and of regulation by intramolecular inhibitory interactions, as well as an important anticancer target due to its roles in cell proliferation and metastasis. The assignment of backbone (1)H(N), (13)C(α), (13)CO, and (15)N, and sidechain (13)C(β) resonances of the catalytic domain of Src (283 residues) in complex with the anticancer drug Imatinib is reported here. Consistent with previous X-ray studies of the same complex, most signals from the activation loop are not detected, indicating that, even in the presence of the drug, it probably adopts highly heterogeneous conformations in intermediate exchange. For the rest of the polypeptide backbone, assignments have been completed for ~88% of residues, with only a few solvent-exposed amides remaining unassigned.
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Affiliation(s)
- Ramón Campos-Olivas
- Spectroscopy and NMR Unit, Structural and Computational Biology Programme, Spanish National Cancer Center (CNIO), C. Melchor Fernández Almagro, 3, 28029, Madrid, Spain.
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26
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Zhuang T, Vishnivetskiy SA, Gurevich VV, Sanders CR. Elucidation of inositol hexaphosphate and heparin interaction sites and conformational changes in arrestin-1 by solution nuclear magnetic resonance. Biochemistry 2010; 49:10473-85. [PMID: 21050017 DOI: 10.1021/bi101596g] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Arrestins specifically bind activated and phosphorylated G protein-coupled receptors and orchestrate both receptor trafficking and channel signaling through G protein-independent pathways via direct interactions with numerous nonreceptor partners. Here we report the first successful use of solution NMR in mapping the binding sites in arrestin-1 (visual arrestin) for two polyanionic compounds that mimic phosphorylated light-activated rhodopsin: inositol hexaphosphate (IP6) and heparin. This yielded an identification of residues involved in the binding with these ligands that was more complete than what has previously been feasible. IP6 and heparin appear to bind to the same site on arrestin-1, centered on a positively charged region in the N-domain. We present the first direct evidence that both IP6 and heparin induced a complete release of the arrestin C-tail. These observations provide novel insight into the nature of the transition of arrestin from the basal to active state and demonstrate the potential of NMR-based methods in the study of protein-protein interactions involving members of the arrestin family.
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Affiliation(s)
- Tiandi Zhuang
- Department of Biochemistry, Vanderbilt University School ofMedicine, Nashville, Tennessee 37232, United States
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27
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Leroy A, Landrieu I, Huvent I, Legrand D, Codeville B, Wieruszeski JM, Lippens G. Spectroscopic studies of GSK3{beta} phosphorylation of the neuronal tau protein and its interaction with the N-terminal domain of apolipoprotein E. J Biol Chem 2010; 285:33435-33444. [PMID: 20679343 DOI: 10.1074/jbc.m110.149419] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Alzheimer disease neurons are characterized by extraneuronal plaques formed by aggregated amyloid-β peptide and by intraneuronal tangles composed of fibrillar aggregates of the microtubule-associated Tau protein. Tau is mostly found in a hyperphosphorylated form in these tangles. Glycogen synthase kinase 3β (GSK3β) is a proline-directed kinase generally considered as one of the major players that (hyper)phosphorylates Tau. The kinase phosphorylates mainly (Ser/Thr)-Pro motifs and is believed to require a priming activity by another kinase. Here, we use an in vitro phosphorylation assay and NMR spectroscopy to characterize in a qualitative and quantitative manner the phosphorylation of Tau by GSK3β. We find that three residues can be phosphorylated (Ser-396, Ser-400, and Ser-404) by GSK3β alone, without priming. Ser-404 is essential in this process, as its mutation to Ala prevents all activity of GSK3β. However, priming enhances the catalytic efficacy of the kinase, as initial phosphorylation of Ser-214 by the cAMP-dependent protein kinase (PKA) leads to the rapid modification by GSK3β of four regularly spaced additional sites. Because the regular incorporation of negative charges by GSK3β leads to a potential parallel between phospho-Tau and heparin, we investigated its interaction with the heparin/low density lipoprotein receptor binding domain of human apolipoprotein E. We indeed observed an interaction between the GSK3β-promoted regular phospho-pattern on Tau and the apolipoprotein E fragment but none in the absence of phosphorylation or the presence of an irregular phosphorylation pattern by the prolonged activity of PKA. Apolipoprotein E is therefore able to discriminate and interact with specific phosphorylation patterns of Tau.
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Affiliation(s)
- Arnaud Leroy
- From the Structural and Functional Glycobiology Unit, UMR8576 CNRS-University of Sciences and Technologies of Lille, 59655 Villeneuve d'Ascq; Laboratoire de Biochimie Appliquée, Faculté de Pharmacie à Châtenay-Malabry, University of Paris XI, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France.
| | - Isabelle Landrieu
- From the Structural and Functional Glycobiology Unit, UMR8576 CNRS-University of Sciences and Technologies of Lille, 59655 Villeneuve d'Ascq
| | - Isabelle Huvent
- From the Structural and Functional Glycobiology Unit, UMR8576 CNRS-University of Sciences and Technologies of Lille, 59655 Villeneuve d'Ascq
| | - Dominique Legrand
- From the Structural and Functional Glycobiology Unit, UMR8576 CNRS-University of Sciences and Technologies of Lille, 59655 Villeneuve d'Ascq
| | - Bernadette Codeville
- From the Structural and Functional Glycobiology Unit, UMR8576 CNRS-University of Sciences and Technologies of Lille, 59655 Villeneuve d'Ascq
| | - Jean-Michel Wieruszeski
- From the Structural and Functional Glycobiology Unit, UMR8576 CNRS-University of Sciences and Technologies of Lille, 59655 Villeneuve d'Ascq
| | - Guy Lippens
- From the Structural and Functional Glycobiology Unit, UMR8576 CNRS-University of Sciences and Technologies of Lille, 59655 Villeneuve d'Ascq.
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Nabetani T, Kim YJ, Watanabe M, Ohashi Y, Kamiguchi H, Hirabayashi Y. Improved method of phosphopeptides enrichment using biphasic phosphate-binding tag/C18 tip for versatile analysis of phosphorylation dynamics. Proteomics 2009; 9:5525-33. [DOI: 10.1002/pmic.200900341] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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González-Ruiz D, Gohlke H. Steering Protein−Ligand Docking with Quantitative NMR Chemical Shift Perturbations. J Chem Inf Model 2009; 49:2260-71. [DOI: 10.1021/ci900188r] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Domingo González-Ruiz
- Fachbereich Biowissenschaften, Molekulare Bioinformatik, Goethe-Universität, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany, and Institut für Pharmazeutische und Medizinische Chemie, Heinrich-Heine-Universität, Universitätstrasse 1, 40225 Düsseldorf, Germany
| | - Holger Gohlke
- Fachbereich Biowissenschaften, Molekulare Bioinformatik, Goethe-Universität, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany, and Institut für Pharmazeutische und Medizinische Chemie, Heinrich-Heine-Universität, Universitätstrasse 1, 40225 Düsseldorf, Germany
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30
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Masterson LR, Shi L, Tonelli M, Mascioni A, Mueller MM, Veglia G. Backbone NMR resonance assignment of the catalytic subunit of cAMP-dependent protein kinase A in complex with AMP-PNP. BIOMOLECULAR NMR ASSIGNMENTS 2009; 3:115-7. [PMID: 19636960 PMCID: PMC2861490 DOI: 10.1007/s12104-009-9154-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2008] [Accepted: 03/23/2009] [Indexed: 05/16/2023]
Abstract
The catalytic subunit of protein kinase A is involved with a number of signal transduction pathways and has been used as a benchmark to study the structural biology and biochemistry for the entire kinase family of enzymes. Here, we report the backbone assignment of the intact 41 kDa catalytic subunit bound to AMP-PNP.
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Affiliation(s)
- Larry R. Masterson
- Departments of Chemistry and Biochemistry, Molecular Biology, and Biophysics University of Minnesota, Minneapolis, MN 55455, USA
| | - Lei Shi
- Departments of Chemistry and Biochemistry, Molecular Biology, and Biophysics University of Minnesota, Minneapolis, MN 55455, USA
| | - Marco Tonelli
- National Magnetic Resonance Facility at Madison, Department of Biochemistry University of Wisconsin-Madison, Madison, WI 53706, USA
| | | | - Michael M. Mueller
- Departments of Chemistry and Biochemistry, Molecular Biology, and Biophysics University of Minnesota, Minneapolis, MN 55455, USA
| | - Gianluigi Veglia
- Departments of Chemistry and Biochemistry, Molecular Biology, and Biophysics University of Minnesota, Minneapolis, MN 55455, USA vegli001@u mn.edu
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31
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Piserchio A, Ghose R, Cowburn D. Optimized bacterial expression and purification of the c-Src catalytic domain for solution NMR studies. JOURNAL OF BIOMOLECULAR NMR 2009; 44:87-93. [PMID: 19399371 PMCID: PMC2735562 DOI: 10.1007/s10858-009-9318-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Accepted: 04/06/2009] [Indexed: 05/27/2023]
Abstract
Progression of a host of human cancers is associated with elevated levels of expression and catalytic activity of the Src family of tyrosine kinases (SFKs), making them key therapeutic targets. Even with the availability of multiple crystal structures of active and inactive forms of the SFK catalytic domain (CD), a complete understanding of its catalytic regulation is unavailable. Also unavailable are atomic or near-atomic resolution information about their interactions, often weak or transient, with regulating phosphatases and downstream targets. Solution NMR, the biophysical method best suited to tackle this problem, was previously hindered by difficulties in bacterial expression and purification of sufficient quantities of soluble, properly folded protein for economically viable labeling with NMR-active isotopes. Through a choice of optimal constructs, co-expression with chaperones and optimization of the purification protocol, we have achieved the ability to bacterially produce large quantities of the isotopically-labeled CD of c-Src, the prototypical SFK, and of its activating Tyr-phosphorylated form. All constructs produce excellent spectra allowing solution NMR studies of this family in an efficient manner.
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Affiliation(s)
- Andrea Piserchio
- New York Structural Biology Center, New York, New York, 10027
- The Department of Chemistry, The City College of New York, New York 10031
| | - Ranajeet Ghose
- The Department of Chemistry, The City College of New York, New York 10031
- Graduate Center of the City University of New York, New York, New York 10016
| | - David Cowburn
- New York Structural Biology Center, New York, New York, 10027
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Abstract
In the past decade, the potential of harnessing the ability of nuclear magnetic resonance (NMR) spectroscopy to monitor intermolecular interactions as a tool for drug discovery has been increasingly appreciated in academia and industry. In this Perspective, we highlight some of the major applications of NMR in drug discovery, focusing on hit and lead generation, and provide a critical analysis of its current and potential utility.
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Orts J, Tuma J, Reese M, Grimm S, Monecke P, Bartoschek S, Schiffer A, Wendt K, Griesinger C, Carlomagno T. Crystallography-Independent Determination of Ligand Binding Modes. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200801792] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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34
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Orts J, Tuma J, Reese M, Grimm S, Monecke P, Bartoschek S, Schiffer A, Wendt K, Griesinger C, Carlomagno T. Crystallography-Independent Determination of Ligand Binding Modes. Angew Chem Int Ed Engl 2008; 47:7736-40. [DOI: 10.1002/anie.200801792] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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35
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Orts J, Grimm SK, Griesinger C, Wendt KU, Bartoschek S, Carlomagno T. Specific Methyl Group Protonation for the Measurement of Pharmacophore-Specific Interligand NOE Interactions. Chemistry 2008; 14:7517-20. [DOI: 10.1002/chem.200800880] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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36
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Abstract
Allosteric signaling in proteins requires long-range communication mediated by highly conserved residues, often triggered by ligand binding. In this article, we map the allosteric network in the catalytic subunit of protein kinase A using NMR spectroscopy. We show that positive allosteric cooperativity is generated by nucleotide and substrate binding during the transitions through the major conformational states: apo, intermediate, and closed. The allosteric network is disrupted by a single site mutation (Y204A), which also decouples the cooperativity of ligand binding. Because protein kinase A is the prototype for the entire kinome, these findings may serve as a paradigm for describing long-range coupling in other protein kinases.
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37
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Tonelli M, Masterson LR, Hallenga K, Veglia G, Markley JL. Carbonyl carbon label selective (CCLS) 1H-15N HSQC experiment for improved detection of backbone 13C-15N cross peaks in larger proteins. JOURNAL OF BIOMOLECULAR NMR 2007; 39:177-85. [PMID: 17828465 PMCID: PMC4452135 DOI: 10.1007/s10858-007-9185-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2007] [Revised: 08/06/2007] [Accepted: 08/07/2007] [Indexed: 05/15/2023]
Abstract
We present a highly sensitive pulse sequence, carbonyl carbon label selective (1)H-(15)N HSQC (CCLS-HSQC) for the detection of signals from (1)H-(15)N units involved in (13)C'-(15)N linkages. The CCLS-HSQC pulse sequence utilizes a modified (15)N CT evolution period equal to 1/( [Formula: see text]) ( approximately 33 ms) to select for (13)C'-(15)N pairs. By collecting CCLS-HSQC and HNCO data for two proteins (8 kDa ubiquitin and 20 kDa HscB) at various temperatures (5-40 degrees C) in order to vary correlation times, we demonstrate the superiority of the CCLS-HSQC pulse sequence for proteins with long correlation times (i.e. higher molecular weight). We then show that the CCLS-HSQC experiment yields assignments in the case of a 41 kDa protein incorporating pairs of (15)N- and (13)C'-labeled amino acids, where a TROSY 2D-HN(CO) had failed. Although the approach requires that the (1)H-(15)N HSQC cross peaks be observable, it does not require deuteration of the protein. The method is suitable for larger proteins and is less affected by conformational exchange than HNCO experiments, which require a longer period of transverse (15)N magnetization. The method also is tolerant to the partial loss of signal from isotopic dilution (scrambling). This approach will be applicable to families of proteins that have been resistant to NMR structural and dynamic analysis, such as large enzymes, and partially folded or unfolded proteins.
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Affiliation(s)
- Marco Tonelli
- National Magnetic Resonance Facility at Madison, Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Drive, Madison, WI 53706, USA
| | - Larry R. Masterson
- Departments of Chemistry and Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Klaas Hallenga
- National Magnetic Resonance Facility at Madison, Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Drive, Madison, WI 53706, USA
| | - Gianluigi Veglia
- Departments of Chemistry and Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - John L. Markley
- National Magnetic Resonance Facility at Madison, Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Drive, Madison, WI 53706, USA
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38
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Vogtherr M, Saxena K, Hoelder S, Grimme S, Betz M, Schieborr U, Pescatore B, Robin M, Delarbre L, Langer T, Wendt KU, Schwalbe H. NMR characterization of kinase p38 dynamics in free and ligand-bound forms. Angew Chem Int Ed Engl 2007; 45:993-7. [PMID: 16374788 DOI: 10.1002/anie.200502770] [Citation(s) in RCA: 132] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Martin Vogtherr
- Johann Wolfgang Goethe-University Frankfurt, Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Germany
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39
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Gelev V, Aktas H, Marintchev A, Ito T, Frueh D, Hemond M, Rovnyak D, Debus M, Hyberts S, Usheva A, Halperin J, Wagner G. Mapping of the auto-inhibitory interactions of protein kinase R by nuclear magnetic resonance. J Mol Biol 2006; 364:352-63. [PMID: 17011579 PMCID: PMC3622519 DOI: 10.1016/j.jmb.2006.08.077] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Revised: 08/24/2006] [Accepted: 08/28/2006] [Indexed: 11/23/2022]
Abstract
The dsRNA-dependent protein kinase (PKR) is a key mediator of the anti-viral and anti-proliferative effects of interferon. Unphosphorylated PKR is characterized by inhibitory interactions between the kinase and RNA binding domains (RBDs), but the structural details of the latent state and its unraveling during activation are not well understood. To study PKR regulation by NMR we assigned a large portion of the backbone resonances of the catalytically inactive K296R kinase domain, and performed (15)N-heteronuclear single quantum coherence (HSQC) titrations of this kinase domain with the RBDs. Chemical shift perturbations in the kinase indicate that RBD2 binds to the substrate eIF2alpha docking site in the kinase C-lobe. Consistent with these results, a mutation in the eIF2alpha docking site, F495A, displays weaker interactions with the RBD. The full-length RBD1+2 binds more strongly to the kinase domain than RBD2 alone. The observed chemical shift changes extend from the eIF2alpha binding site into the kinase N-lobe and inside the active site, consistent with weak interactions between the N-terminal part of the RBD and the kinase.
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Affiliation(s)
- Vladimir Gelev
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Ave, Boston, MA 02115
| | - Husseyin Aktas
- Laboratory for Membrane Transport, Harvard Medical School, 1 Kendall Square, Cambridge, MA 02139
| | - Assen Marintchev
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Ave, Boston, MA 02115
| | - Takuhiro Ito
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Ave, Boston, MA 02115
| | - Dominique Frueh
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Ave, Boston, MA 02115
| | - Michael Hemond
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Ave, Boston, MA 02115
| | - David Rovnyak
- Chemistry Department, Bucknell University, Lewisburg, PA 17837
| | - Miriam Debus
- Laboratory for Membrane Transport, Harvard Medical School, 1 Kendall Square, Cambridge, MA 02139
| | - Sven Hyberts
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Ave, Boston, MA 02115
| | - Anny Usheva
- Department of Medicine, Beth Israel Deaconnes Medical Center, 99 Brookline Ave, Boston, MA 02215
| | - Jose Halperin
- Laboratory for Membrane Transport, Harvard Medical School, 1 Kendall Square, Cambridge, MA 02139
| | - Gerhard Wagner
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Ave, Boston, MA 02115
- *Address correspondence to
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40
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Landrieu I, Lacosse L, Leroy A, Wieruszeski JM, Trivelli X, Sillen A, Sibille N, Schwalbe H, Saxena K, Langer T, Lippens G. NMR analysis of a Tau phosphorylation pattern. J Am Chem Soc 2006; 128:3575-83. [PMID: 16536530 DOI: 10.1021/ja054656+] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The phosphorylation of the neuronal Tau protein modulates both its physiological role of microtubule binding and its aggregation into paired helical fragments observed in Alzheimer's diseased neurons. However, detailed knowledge of the role of phosphorylation at specific sites has been hampered by the analytical difficulties to evaluate the level of site-specific phosphate incorporation. Even with recombinant kinases, mass spectrometry and immunodetection are not evident for determining the full phosphorylation pattern in a qualitative and quantitative manner. We show here that heteronuclear NMR spectroscopy on a 15N labeled Tau sample modified by the cAMP dependent kinase allows identification of all phosphorylation sites, measures their level of phosphate integration, and yields kinetic data for the enzymatic modification of the individual sites. Filtering through the 15N label discards the necessity of any further sample purification and allows the in situ monitoring of kinase activity at selected sites. We finally demonstrate that the NMR approach can equally be used to evaluate potential kinase inhibitors in a straightforward manner.
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41
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Vogtherr M, Saxena K, Hoelder S, Grimme S, Betz M, Schieborr U, Pescatore B, Robin M, Delarbre L, Langer T, Wendt KU, Schwalbe H. Charakterisierung der Dynamik der Kinase p38 in freiem und ligandgebundenem Zustand durch NMR-Spektroskopie. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200502770] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Jahnke W, Blommers MJJ, Fernández C, Zwingelstein C, Amstutz R. Strategies for the NMR-based identification and optimization of allosteric protein kinase inhibitors. Chembiochem 2006; 6:1607-10. [PMID: 16028302 DOI: 10.1002/cbic.200500100] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Wolfgang Jahnke
- Novartis Institutes for Biomedical Research, Discovery Technologies, WSJ-88.904, 4002 Basel, Switzerland.
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43
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Cherry M, Reader J, Williams D. Finding protein kinase hits using structural information. PROGRESS IN MEDICINAL CHEMISTRY 2006; 44:1-63. [PMID: 16697894 DOI: 10.1016/s0079-6468(05)44401-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Affiliation(s)
- Mike Cherry
- Sareum Ltd, 2 Pampisford Park, Cambridge, UK
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44
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Langer T, Sreeramulu S, Vogtherr M, Elshorst B, Betz M, Schieborr U, Saxena K, Schwalbe H. Folding and activity of cAMP-dependent protein kinase mutants. FEBS Lett 2005; 579:4049-54. [PMID: 16026785 DOI: 10.1016/j.febslet.2005.06.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2005] [Revised: 06/07/2005] [Accepted: 06/10/2005] [Indexed: 11/18/2022]
Abstract
The catalytic subunit of cAMP-dependent protein kinase (PKA) can easily be expressed in Escherichia coli and is catalytically active. Four phosphorylation sites are known in PKA (S10, S139, T197 and S338), and the isolated recombinant protein is a mixture of different phosphorylated forms. Obtaining uniformly phosphorylated protein requires separation of the protein preparation leading to significant loss in protein yield. It is found that the mutant S10A/S139D/S338D has similar properties as the wild-type protein, whereas additional replacement of T197 with either E or D reduces protein expression yield as well as folding propensity of the protein. Due to its high sequence homology to Akt/PKB, which cannot easily be expressed in E. coli, PKA has been used as a surrogate kinase for drug design. Several mutations within the ATP binding site have been described to make PKA even more similar to Akt/PKB. Two proteins with Akt/PKB-like mutations in the ATP binding site were made (PKAB6 and PKAB8), and in addition S10, S139 and S338 phosphorylation sites have been removed. These proteins can be expressed in high yields but have reduced activity compared to the wild-type. Proper folding of all proteins was analyzed by 2D 1H, 15N-TROSY NMR experiments.
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Affiliation(s)
- Thomas Langer
- Johann Wolfgang Goethe-University Frankfurt, Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Marie Curie Strasse 11, D-60439 Frankfurt am Main, Germany.
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45
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Abstract
ATP-STD NMR takes advantage of Mg2+ binding to ATP to adjust the ATP affinity for protein kinases permitting a wide range of Ki's to be determined for ATP competitive ligands. Substituting Mn2+ for Mg2+ creates a paramagnetic probe (MnATP) from which the proximity of non-ATP competitive ligands can be inferred. Internal standards and references are used to reduce false positives due to protein or compound degradation. Use of the natural ATP ligand confers active site-specificity that is not available a priori from other ligand binding experiments.
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Affiliation(s)
- Mark A McCoy
- Schering-Plough Research Institute, 2015 Galloping Hill Road, Kenilworth, New Jersey 07033, USA.
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46
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Schieborr U, Vogtherr M, Elshorst B, Betz M, Grimme S, Pescatore B, Langer T, Saxena K, Schwalbe H. How Much NMR Data Is Required To Determine a Protein-Ligand Complex Structure? Chembiochem 2005; 6:1891-8. [PMID: 16013076 DOI: 10.1002/cbic.200500092] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Here we present an NMR-based approach to solving protein-ligand structures. The procedure is guided by biophysical, biochemical, or knowledge-based data. The structures are mainly derived from ligand-induced chemical-shift perturbations (CSP) induced in the resonances of the protein and ligand-detected saturated transfer difference signals between ligands and selectively labeled proteins (SOS-NMR). Accuracy, as judged by comparison with X-ray results, depends on the nature and completeness of the experimental data. An experimental protocol is proposed that starts with calculations that make use of readily available chemical-shift perturbations as experimental constraints. If necessary, more sophisticated experimental results have to be added to improve the accuracy of the protein-ligand complex structure. The criteria for evaluation and selection of meaningful complex structures are discussed. These are exemplified for three complexes, and we show that the approach bridges the gap between theoretical docking approaches and complex NMR schemes for determining protein-ligand complexes; especially for relatively weak binders that do not lead to intermolecular NOEs.
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Affiliation(s)
- Ulrich Schieborr
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe Universität Frankfurt, Marie Curie Strasse 11, 60439 Frankfurt am Main, Germany
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47
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Vogtherr M, Saxena K, Grimme S, Betz M, Schieborr U, Pescatore B, Langer T, Schwalbe H. NMR backbone assignment of the mitogen-activated protein (MAP) kinase p38. JOURNAL OF BIOMOLECULAR NMR 2005; 32:175. [PMID: 16034669 DOI: 10.1007/s10858-005-2449-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2005] [Accepted: 02/09/2005] [Indexed: 05/03/2023]
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