1
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Heme oxygenase-1, carbon monoxide, and malaria – The interplay of chemistry and biology. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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2
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Gao X, Ma Q, Chen M, Dong M, Pu Z, Zhang X, Song Y. Insight into the Highly Conserved and Differentiated Cofactor-Binding Sites of meso-Diaminopimelate Dehydrogenase StDAPDH. J Chem Inf Model 2019; 59:2331-2338. [PMID: 30807172 DOI: 10.1021/acs.jcim.8b00879] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
meso-Diaminopimelate dehydrogenase ( meso-DAPDH) is a good candidate for one-step synthesis of d-amino acid from 2-keto acids. Our previous research revealed the classification of meso-DAPDH family and showed that type II meso-DAPDH, such as the meso-DAPDH from Symbiobacterium thermophilum (StDAPDH), could catalyze reductive amination. In this article, seven residues of StDAPDH, which are highly conserved in each subfamily but are different between two subfamilies, were targeted to explore the relationships between structure and function. Determination of kinetic parameters showed that the amino acid residues, including P69, K159, V68, S90, V14, and V156, played very important roles in the catalytic function of StDAPDH. Molecular dynamics simulation revealed that these point mutations reduced the productive conformations by the newly formed or eliminated interactions between the residues and ligands. These results strengthen our understanding of the catalytic mechanism and evolution of meso-DAPDH and can aid future endeavors in enzyme engineering.
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Affiliation(s)
- Xiuzhen Gao
- School of Life Science , Shandong University of Technology , Zibo 255000 , People's Republic of China
| | - Qinyuan Ma
- Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science &Technology), Ministry of Education, Tianjin Key Lab of Industrial Microbiology, College of Biotechnology , Tianjin University of Science and Technology , Tianjin 300457 , People's Republic of China
| | - Meiling Chen
- School of Agricultural Engineering and Food Science , Shandong University of Technology , Zibo 255000 , People's Republic of China
| | - Miaomiao Dong
- School of Life Science , Shandong University of Technology , Zibo 255000 , People's Republic of China
| | - Zhongji Pu
- School of Life Science and Biotechnology , Dalian University of Technology , Dalian 116024 , People's Republic of China
| | - Xianhai Zhang
- School of Life Science , Shandong University of Technology , Zibo 255000 , People's Republic of China
| | - Yuanda Song
- School of Agricultural Engineering and Food Science , Shandong University of Technology , Zibo 255000 , People's Republic of China
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3
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Paukovich N, Xue M, Elder JR, Redzic JS, Blue A, Pike H, Miller BG, Pitts TM, Pollock DD, Hansen K, D'Alessandro A, Eisenmesser EZ. Biliverdin Reductase B Dynamics Are Coupled to Coenzyme Binding. J Mol Biol 2018; 430:3234-3250. [PMID: 29932944 DOI: 10.1016/j.jmb.2018.06.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 06/05/2018] [Accepted: 06/06/2018] [Indexed: 12/28/2022]
Abstract
Biliverdin reductase B (BLVRB) is a newly identified cellular redox regulator that catalyzes the NADPH-dependent reduction of multiple substrates. Through mass spectrometry analysis, we identified high levels of BLVRB in mature red blood cells, highlighting the importance of BLVRB in redox regulation. The BLVRB conformational changes that occur during conezyme/substrate binding and the role of dynamics in BLVRB function, however, remain unknown. Through a combination of NMR, kinetics, and isothermal titration calorimetry studies, we determined that BLVRB binds its coenzyme 500-fold more tightly than its substrate. While the active site of apo BLVRB is highly dynamic on multiple timescales, active site dynamics are largely quenched within holo BLVRB, in which dynamics are redistributed to other regions of the enzyme. We show that a single point mutation of Arg78➔Ala leads to both an increase in active site micro-millisecond motions and an increase in the microscopic rate constants of coenzyme binding. This demonstrates that altering BLVRB active site dynamics can directly cause a change in functional characteristics. Our studies thus address the solution behavior of apo and holo BLVRB and identify a role of enzyme dynamics in coenzyme binding.
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Affiliation(s)
- Natasia Paukovich
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA
| | - Mengjun Xue
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA
| | - James R Elder
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA
| | - Jasmina S Redzic
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA
| | - Ashley Blue
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - Hamish Pike
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA
| | - Brian G Miller
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, FL 32310, USA
| | - Todd M Pitts
- Division of Medical Oncology, School of Medicine, Aurora, CO 80045, USA
| | - David D Pollock
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA
| | - Kirk Hansen
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA
| | - Angelo D'Alessandro
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA
| | - Elan Zohar Eisenmesser
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado Denver, School of Medicine, Aurora, CO 80045, USA.
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4
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Nesbitt NM, Zheng X, Li Z, Manso JA, Yen WY, Malone LE, Ripoll-Rozada J, Pereira PJB, Mantle TJ, Wang J, Bahou WF. In silico and crystallographic studies identify key structural features of biliverdin IXβ reductase inhibitors having nanomolar potency. J Biol Chem 2018; 293:5431-5446. [PMID: 29487133 DOI: 10.1074/jbc.ra118.001803] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 02/23/2018] [Indexed: 12/20/2022] Open
Abstract
Heme cytotoxicity is minimized by a two-step catabolic reaction that generates biliverdin (BV) and bilirubin (BR) tetrapyrroles. The second step is regulated by two non-redundant biliverdin reductases (IXα (BLVRA) and IXβ (BLVRB)), which retain isomeric specificity and NAD(P)H-dependent redox coupling linked to BR's antioxidant function. Defective BLVRB enzymatic activity with antioxidant mishandling has been implicated in metabolic consequences of hematopoietic lineage fate and enhanced platelet counts in humans. We now outline an integrated platform of in silico and crystallographic studies for the identification of an initial class of compounds inhibiting BLVRB with potencies in the nanomolar range. We found that the most potent BLVRB inhibitors contain a tricyclic hydrocarbon core structure similar to the isoalloxazine ring of flavin mononucleotide and that both xanthene- and acridine-based compounds inhibit BLVRB's flavin and dichlorophenolindophenol (DCPIP) reductase functions. Crystallographic studies of ternary complexes with BLVRB-NADP+-xanthene-based compounds confirmed inhibitor binding adjacent to the cofactor nicotinamide and interactions with the Ser-111 side chain. This residue previously has been identified as critical for maintaining the enzymatic active site and cellular reductase functions in hematopoietic cells. Both acridine- and xanthene-based compounds caused selective and concentration-dependent loss of redox coupling in BLVRB-overexpressing promyelocytic HL-60 cells. These results provide promising chemical scaffolds for the development of enhanced BLVRB inhibitors and identify chemical probes to better dissect the role of biliverdins, alternative substrates, and BLVRB function in physiologically relevant cellular contexts.
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Affiliation(s)
| | - Xiliang Zheng
- the State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, ChangChun, Jilin 130022, China
| | | | - José A Manso
- the IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, 4200-135 Porto, Portugal.,the i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal, and
| | | | | | - Jorge Ripoll-Rozada
- the IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, 4200-135 Porto, Portugal.,the i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal, and
| | - Pedro José Barbosa Pereira
- the IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, 4200-135 Porto, Portugal.,the i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal, and
| | - Timothy J Mantle
- the Department of Biochemistry, Trinity College, Dublin 2, Ireland
| | - Jin Wang
- Chemistry and Physics, State University of New York at Stony Brook, Stony Brook, New York 11794-8151,
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5
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Exploration of binding and inhibition mechanism of a small molecule inhibitor of influenza virus H1N1 hemagglutinin by molecular dynamics simulation. Sci Rep 2017. [PMID: 28630402 PMCID: PMC5476670 DOI: 10.1038/s41598-017-03719-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Influenza viruses are a major public health threat worldwide. The influenza hemagglutinin (HA) plays an essential role in the virus life cycle. Due to the high conservation of the HA stem region, it has become an especially attractive target for inhibitors for therapeutics. In this study, molecular simulation was applied to study the mechanism of a small molecule inhibitor (MBX2329) of influenza HA. Behaviors of the small molecule under neutral and acidic conditions were investigated, and an interesting dynamic binding mechanism was found. The results suggested that the binding of the inhibitor with HA under neutral conditions facilitates only its intake, while it interacts with HA under acidic conditions using a different mechanism at a new binding site. After a series of experiments, we believe that binding of the inhibitor can prevent the release of HA1 from HA2, further maintaining the rigidity of the HA2 loop and stabilizing the distance between the long helix and short helices. The investigated residues in the new binding site show high conservation, implying that the new binding pocket has the potential to be an effective drug target. The results of this study will provide a theoretical basis for the mechanism of new influenza virus inhibitors.
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6
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Takao H, Hirabayashi K, Nishigaya Y, Kouriki H, Nakaniwa T, Hagiwara Y, Harada J, Sato H, Yamazaki T, Sakakibara Y, Suiko M, Asada Y, Takahashi Y, Yamamoto K, Fukuyama K, Sugishima M, Wada K. A substrate-bound structure of cyanobacterial biliverdin reductase identifies stacked substrates as critical for activity. Nat Commun 2017; 8:14397. [PMID: 28169272 PMCID: PMC5309722 DOI: 10.1038/ncomms14397] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 12/23/2016] [Indexed: 01/20/2023] Open
Abstract
Biliverdin reductase catalyses the last step in haem degradation and produces the major lipophilic antioxidant bilirubin via reduction of biliverdin, using NAD(P)H as a cofactor. Despite the importance of biliverdin reductase in maintaining the redox balance, the molecular details of the reaction it catalyses remain unknown. Here we present the crystal structure of biliverdin reductase in complex with biliverdin and NADP+. Unexpectedly, two biliverdin molecules, which we designated the proximal and distal biliverdins, bind with stacked geometry in the active site. The nicotinamide ring of the NADP+ is located close to the reaction site on the proximal biliverdin, supporting that the hydride directly attacks this position of the proximal biliverdin. The results of mutagenesis studies suggest that a conserved Arg185 is essential for the catalysis. The distal biliverdin probably acts as a conduit to deliver the proton from Arg185 to the proximal biliverdin, thus yielding bilirubin.
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Affiliation(s)
- Haruna Takao
- Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-1692, Japan
- Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Kei Hirabayashi
- Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Yuki Nishigaya
- Advanced Analysis Center, National Agriculture and Food Research Organization, Ibaraki 305-8602, Japan
| | - Haruna Kouriki
- Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Tetsuko Nakaniwa
- Department of Biological Sciences, Graduate School of Science, Osaka University, Osaka 560-0043, Japan
| | - Yoshinori Hagiwara
- Department of Biochemistry and Applied Chemistry, National Institute of Technology, Kurume College, Fukuoka 830-8555, Japan
| | - Jiro Harada
- Department of Medical Biochemistry, Kurume University School of Medicine, Fukuoka 830-0011, Japan
| | - Hideaki Sato
- Department of Medical Biochemistry, Kurume University School of Medicine, Fukuoka 830-0011, Japan
| | - Toshimasa Yamazaki
- Advanced Analysis Center, National Agriculture and Food Research Organization, Ibaraki 305-8602, Japan
| | - Yoichi Sakakibara
- Department of Biochemistry and Applied Biosciences, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Masahito Suiko
- Department of Biochemistry and Applied Biosciences, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Yujiro Asada
- Department of Pathology, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Yasuhiro Takahashi
- Division of Life Science, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
| | - Ken Yamamoto
- Department of Medical Biochemistry, Kurume University School of Medicine, Fukuoka 830-0011, Japan
| | - Keiichi Fukuyama
- Department of Biological Sciences, Graduate School of Science, Osaka University, Osaka 560-0043, Japan
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
| | - Masakazu Sugishima
- Department of Medical Biochemistry, Kurume University School of Medicine, Fukuoka 830-0011, Japan
| | - Kei Wada
- Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-1692, Japan
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7
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Ganesan A, Coote ML, Barakat K. Molecular dynamics-driven drug discovery: leaping forward with confidence. Drug Discov Today 2017; 22:249-269. [DOI: 10.1016/j.drudis.2016.11.001] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 09/22/2016] [Accepted: 11/01/2016] [Indexed: 12/11/2022]
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8
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Chu WT, Nesbitt NM, Gnatenko DV, Li Z, Zhang B, Seeliger MA, Browne S, Mantle TJ, Bahou WF, Wang J. Enzymatic Activity and Thermodynamic Stability of Biliverdin IXβ Reductase Are Maintained by an Active Site Serine. Chemistry 2017; 23:1891-1900. [PMID: 27897348 DOI: 10.1002/chem.201604517] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Indexed: 11/10/2022]
Abstract
Biliverdin reductase IXβ (BLVRB) is a crucial enzyme in heme metabolism. Recent studies in humans have identified a loss-of-function mutation (Ser111Leu) that unmasks a fundamentally important role in hematopoiesis. We have undertaken experimental and thermodynamic modeling studies to provide further insight into the role of the cofactor in substrate accessibility and protein folding properties regulating BLVRB catalytic mechanisms. Site-directed mutagenesis with molecular dynamic (MD) simulations establish the critical role of NAD(P)H-dependent conformational changes on substrate accessibility by forming the "hydrophobic pocket", along with identification of a single key residue (Arg35) modulating NADPH/NADH selectivity. Loop80 and Loop120 block the hydrophobic substrate binding pocket in apo BLVRB (open), whereas movement of these structures after cofactor binding results in the "closed" (catalytically active) conformation. Both enzymatic activity and thermodynamic stability are affected by mutation(s) involving Ser111, which is located in the core of the BLVRB active site. This work 1) elucidates the crucial role of Ser111 in enzymatic catalysis and thermodynamic stability by active site hydrogen bond network; 2) defines a dynamic model for apo BLVRB extending beyond the crystal structure of the binary BLVRB/NADP+ complex; 3) provides a structural basis for the "encounter" and "equilibrium" states of the binary complex, which are regulated by NAD(P)H.
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Affiliation(s)
- Wen-Ting Chu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China
| | - Natasha M Nesbitt
- Department of Medicine, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Dmitri V Gnatenko
- Department of Medicine, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Zongdong Li
- Department of Medicine, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Beibei Zhang
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Markus A Seeliger
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Seamus Browne
- Department of Biochemistry, Trinity College, Dublin 2, Ireland
| | | | - Wadie F Bahou
- Department of Medicine, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Jin Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China.,Department of Chemistry and Physics, Stony Brook University, Stony Brook, NY, 11794, USA
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9
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Mohamed AE, Condic-Jurkic K, Ahmed FH, Yuan P, O'Mara ML, Jackson CJ, Coote ML. Hydrophobic Shielding Drives Catalysis of Hydride Transfer in a Family of F 420H 2-Dependent Enzymes. Biochemistry 2016; 55:6908-6918. [PMID: 27951661 DOI: 10.1021/acs.biochem.6b00683] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A family of flavin/deazaflavin-dependent oxidoreductases (FDORs) from mycobacteria has been recently characterized and found to play a variety of catalytic roles, including the activation of prodrugs such as the candidate anti-tuberculosis drug pretomanid (PA-824). However, our understanding of the catalytic mechanism used by these enzymes is relatively limited. To address this, we have used a combination of quantum mechanics and molecular dynamics calculations to study the catalytic mechanism of the activation of pretomanid by the deazaflavin-dependent nitroreductase (Ddn) from Mycobacterium tuberculosis. The preferred pathway involves an initial hydride transfer step from the deprotonated cofactor (i.e., F420H-), with subsequent protonation, before a series of spontaneous intramolecular reactions to form the final reactive nitrogen species. The most likely proton source is a hydroxonium ion within the solvent accessible active site. Intriguingly, catalysis of the rate-determining hydride transfer step is aided by three tyrosine residues that form a hydrophobic barrier around the active site that, upon reaction, is then disrupted to allow increased water accessibility to facilitate the subsequent proton transfer step. The catalytic mechanism we propose is consistent with previous experimental observations of the Ddn enzyme and will inform the design of improved prodrugs in the future.
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Affiliation(s)
- A Elaaf Mohamed
- Research School of Chemistry, Australian National University , Canberra, ACT 2601, Australia
| | - Karmen Condic-Jurkic
- Research School of Chemistry, Australian National University , Canberra, ACT 2601, Australia
| | - F Hafna Ahmed
- Research School of Chemistry, Australian National University , Canberra, ACT 2601, Australia
| | - Peng Yuan
- Research School of Chemistry, Australian National University , Canberra, ACT 2601, Australia
| | - Megan L O'Mara
- Research School of Chemistry, Australian National University , Canberra, ACT 2601, Australia
| | - Colin J Jackson
- Research School of Chemistry, Australian National University , Canberra, ACT 2601, Australia
| | - Michelle L Coote
- ARC Centre of Excellence for Electromaterials Science, Research School of Chemistry, Australian National University , Canberra, ACT 2601, Australia
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10
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Zhu J, Li X, Zhang S, Ye H, Zhao H, Jin H, Han W. Exploring stereochemical specificity of phosphotriesterase by MM-PBSA and MM-GBSA calculation and steered molecular dynamics simulation. J Biomol Struct Dyn 2016; 35:3140-3151. [DOI: 10.1080/07391102.2016.1244494] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Jingxuan Zhu
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130023, China
| | - Xin Li
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130023, China
| | - Siqi Zhang
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130023, China
| | - Hen Ye
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130023, China
| | - Hui Zhao
- Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Changchun 130023, China
| | - Hanyong Jin
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130023, China
| | - Weiwei Han
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Science, Jilin University, Changchun 130023, China
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11
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Xue Z, Wen H, Wang C, Zhai L, Cheng A, Kou X. CPe-III-S Metabolism in Vitro and in Vivo and Molecular Simulation of Its Metabolites Using a p53-R273H Mutant. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:7095-7103. [PMID: 27584867 DOI: 10.1021/acs.jafc.6b01996] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
It was previously found that CPe-III-S, synthesized according to the chickpea peptide CPe-III (RQSHFANAQP), exhibited an antiproliferative effect. The aim of this study was to investigate the antiproliferative mechanism of CPe-III-S. CPe-III-S was treated by pepsin and trypsin in a simulated gastrointestinal digestion environment as well as in an animal experiment. With HPLC-ESI-MS analysis, three peptide fragments of Ser-His, His-Phe, and Ala-Asn-Ala-Gln were identified. Ser-His was the only common product from both in vitro and in vivo environments. The specific bindings between three peptides and p53-R273H were performed by molecular docking, and the molecular dynamic simulation between Ser-His and p53-R273H revealed the stability of the binding complex. The binding free energy of the complex was -12.56 ± 1.03 kcal/mol with a reliable hydrogen bond between the ligand and Thr284 of p53. Ser-His may restore mutant p53-R273H activity or inhibit its binding with a downstream signal. This metabolite is a potential anticancer factor for suppressing cell proliferation.
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Affiliation(s)
- Zhaohui Xue
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China
| | - Haichao Wen
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China
| | - Cen Wang
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China
| | - Lijuan Zhai
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China
| | - Aiqing Cheng
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China
| | - Xiaohong Kou
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China
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12
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Ahmed FH, Mohamed AE, Carr PD, Lee BM, Condic-Jurkic K, O'Mara ML, Jackson CJ. Rv2074 is a novel F420 H2 -dependent biliverdin reductase in Mycobacterium tuberculosis. Protein Sci 2016; 25:1692-709. [PMID: 27364382 DOI: 10.1002/pro.2975] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 06/29/2016] [Indexed: 12/12/2022]
Abstract
Bilirubin is a potent antioxidant that is produced from the reduction of the heme degradation product biliverdin. In mammalian cells and Cyanobacteria, NADH/NADPH-dependent biliverdin reductases (BVRs) of the Rossmann-fold have been shown to catalyze this reaction. Here, we describe the characterization of Rv2074 from Mycobacterium tuberculosis, which belongs to a structurally and mechanistically distinct family of F420 H2 -dependent BVRs (F-BVRs) that are exclusively found in Actinobacteria. We have solved the crystal structure of Rv2074 bound to its cofactor, F420 , and used this alongside molecular dynamics simulations, site-directed mutagenesis and NMR spectroscopy to elucidate its catalytic mechanism. The production of bilirubin by Rv2074 could exploit the anti-oxidative properties of bilirubin and contribute to the range of immuno-evasive mechanisms that have evolved in M. tuberculosis to allow persistent infection.
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Affiliation(s)
- F Hafna Ahmed
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia
| | - A Elaaf Mohamed
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia
| | - Paul D Carr
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia
| | - Brendon M Lee
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia
| | - Karmen Condic-Jurkic
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia
| | - Megan L O'Mara
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia
| | - Colin J Jackson
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia
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13
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Guan S, Zhao L, Jin H, Shan N, Han W, Wang S, Shan Y. Binding modes of phosphotriesterase-like lactonase complexed with δ-nonanoic lactone and paraoxon using molecular dynamics simulations. J Biomol Struct Dyn 2016; 35:273-286. [DOI: 10.1080/07391102.2016.1142899] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Shanshan Guan
- National Engineering Laboratory For AIDS Vaccine, Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
| | - Li Zhao
- National Engineering Laboratory For AIDS Vaccine, Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
| | - Hanyong Jin
- National Engineering Laboratory For AIDS Vaccine, Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
| | - Ning Shan
- Editorial Department of Journal of Jilin University (Science Edition), Changchun, China
| | - Weiwei Han
- National Engineering Laboratory For AIDS Vaccine, Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
| | - Song Wang
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
| | - Yaming Shan
- National Engineering Laboratory For AIDS Vaccine, Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China
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14
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Fang L, Wang X, Xi M, Liu T, Yin D. Assessing the ligand selectivity of sphingosine kinases using molecular dynamics and MM-PBSA binding free energy calculations. MOLECULAR BIOSYSTEMS 2016; 12:1174-82. [PMID: 26927311 DOI: 10.1039/c6mb00067c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The dynamic balance of sphingolipids plays a crucial role in diverse biological processes such as mitogenesis, cell migration and angiogenesis. Sphingosine kinases (SKs) including SK1 and SK2 phosphorylate sphingosine to sphingosine 1-phosphate (S1P), and control the critical balance. SK1 overexpression was reported to increase cell survival and proliferation. Although several SK1 selective inhibitors have been reported, detailed analysis toward their selectivity to understand the molecular mechanism has not been performed to our knowledge. Herein, the crystal structure of SK1 and a homology model of SK2 were used to dock five inhibitors (1, 2, 3, 4 and 5). Protein-ligand complexes were then subjected to a molecular dynamics study and MM-PBSA binding free energy calculations. By analyzing the binding model of these inhibitors, we found that residues ILE170, PHE188 and THR192 in SK1 significantly contribute a favorable binding energy to the selectivity.
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Affiliation(s)
- Liang Fang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100050, P. R. China.
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15
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Characterization of Aspartate Kinase from Corynebacterium pekinense and the Critical Site of Arg169. Int J Mol Sci 2015; 16:28270-84. [PMID: 26633359 PMCID: PMC4691045 DOI: 10.3390/ijms161226098] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 11/10/2015] [Accepted: 11/11/2015] [Indexed: 11/21/2022] Open
Abstract
Aspartate kinase (AK) is the key enzyme in the biosynthesis of aspartate-derived amino acids. Recombinant AK was efficiently purified and systematically characterized through analysis under optimal conditions combined with steady-state kinetics study. Homogeneous AK was predicted as a decamer with a molecular weight of ~48 kDa and a half-life of 4.5 h. The enzymatic activity was enhanced by ethanol and Ni2+. Moreover, steady-state kinetic study confirmed that AK is an allosteric enzyme, and its activity was inhibited by allosteric inhibitors, such as Lys, Met, and Thr. Theoretical results indicated the binding mode of AK and showed that Arg169 is an important residue in substrate binding, catalytic domain, and inhibitor binding. The values of the kinetic parameter Vmax of R169 mutants, namely, R169Y, R169P, R169D, and R169H AK, with l-aspartate as the substrate, were 4.71-, 2.25-, 2.57-, and 2.13-fold higher, respectively, than that of the wild-type AK. Furthermore, experimental and theoretical data showed that Arg169 formed a hydrogen bond with Glu92, which functions as the entrance gate. This study provides a basis to develop new enzymes and elucidate the corresponding amino acid production.
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16
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O'Brien L, Hosick PA, John K, Stec DE, Hinds TD. Biliverdin reductase isozymes in metabolism. Trends Endocrinol Metab 2015; 26:212-20. [PMID: 25726384 PMCID: PMC4380527 DOI: 10.1016/j.tem.2015.02.001] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 01/28/2015] [Accepted: 02/01/2015] [Indexed: 12/17/2022]
Abstract
The biliverdin reductase (BVR) isozymes BVRA and BVRB are cell surface membrane receptors with pleiotropic functions. This review compares, for the first time, the structural and functional differences between the isozymes. They reduce biliverdin, a byproduct of heme catabolism, to bilirubin, display kinase activity, and BVRA, but not BVRB, can act as a transcription factor. The binding motifs present in the BVR isozymes allow a wide range of interactions with components of metabolically important signaling pathways such as the insulin receptor kinase cascades, protein kinases (PKs), and inflammatory mediators. In addition, serum bilirubin levels have been negatively associated with abdominal obesity and hypertriglyceridemia. We discuss the roles of the BVR isozymes in metabolism and their potential as therapeutic targets.
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Affiliation(s)
- Luke O'Brien
- Center for Hypertension and Personalized Medicine, Department of Physiology and Pharmacology, University of Toledo College of Medicine, Toledo, OH 43614, USA
| | - Peter A Hosick
- Department of Exercise Science and Physical Education, Montclair State University, Montclair, NJ 07043, USA
| | - Kezia John
- Center for Hypertension and Personalized Medicine, Department of Physiology and Pharmacology, University of Toledo College of Medicine, Toledo, OH 43614, USA
| | - David E Stec
- Center for Excellence in Cardiovascular-Renal Research, Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS 39216, USA
| | - Terry D Hinds
- Center for Hypertension and Personalized Medicine, Department of Physiology and Pharmacology, University of Toledo College of Medicine, Toledo, OH 43614, USA.
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17
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Guan SS, Han WW, Zhang H, Wang S, Shan YM. Insight into the interactive residues between two domains of human somatic Angiotensin-converting enzyme and Angiotensin II by MM-PBSA calculation and steered molecular dynamics simulation. J Biomol Struct Dyn 2015; 34:15-28. [PMID: 25582663 DOI: 10.1080/07391102.2015.1007167] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Angiotensin-converting enzyme (ACE), a membrane-bound zinc metallopeptidase, catalyzes the formation of Angiotensin-II (AngII) and the deactivation of bradykinin in the renin-angiotensin-aldosterone and kallikrein-kinin systems. As a hydrolysis product of ACE, AngII is regarded as an inhibitor and displays stronger competitive inhibition in the C-domain than the N-domain of ACE. However, the AngII binding differences between the two domains and the mechanisms behind AngII dissociation from the C-domain are rarely explored. In this work, molecular docking, Molecular Mechanics/Poisson-Boltzmann Surface Area calculation, and steered molecular dynamics (SMD) are applied to explore the structures and interactions in the binding or unbinding of AngII with the two domains of human somatic ACE. Calculated free energy values suggest that the C-domain-AngII complex is more stable than the N-domain-AngII complex, consistent with available experimental data. SMD simulation results imply that electrostatic interaction is dominant in the dissociation of AngII from the C-domain. Moreover, Gln106, Asp121, Glu123, and Tyr213 may be the key residues in the unbinding pathway of AngII. The simulation results in our work provide insights into the interactions between the two domains of ACE and its natural peptide inhibitor AngII at a molecular level. Moreover, the results provide theoretical clues for the design of new inhibitors.
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Affiliation(s)
- Shan-shan Guan
- a State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , People's Republic of China
| | - Wei-wei Han
- b Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education , School of Life Sciences, Jilin University , Changchun 130023 , People's Republic of China
| | - Hao Zhang
- a State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , People's Republic of China
| | - Song Wang
- a State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , People's Republic of China
| | - Ya-ming Shan
- c School of Life Sciences , Jilin University , Changchun 130012 , People's Republic of China
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18
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Bai B, Liu Y, You Y, Li Y, Ma L. Intraperitoneally administered biliverdin protects against UVB-induced skin photo-damage in hairless mice. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 144:35-41. [PMID: 25689514 DOI: 10.1016/j.jphotobiol.2015.02.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 01/30/2015] [Accepted: 02/01/2015] [Indexed: 12/25/2022]
Abstract
Oxidative stress is shown to be responsible for ultraviolet B (UVB) irradiation-induced skin cancer and premature aging. Biliverdin (BVD), a product of heme oxygenase-1, has strong anti-oxidant and anti-inflammatory properties. In the present study, we investigated the effects of BVD on UVB-induced skin photo-damage in hairless mice. Mice were divided into three groups: control group, UVB group (only UVB irradiation) and BVD+UVB group (mice were intraperitoneally injected with BVD before each UVB irradiation). Intraperitoneal BVD injection resulted in a significant photoprotective effect by reducing morphological and histopathological changes to the skin. BVD also exhibited a significant antioxidant effect by increasing the superoxide dismutase (SOD) level and decreasing the thiobarbituric acid reactive substances (TBARS) level compared with the control group. In addition, BVD activated biliverdin reductase (BVR) expression and inhibited the UVB-induced increase of p38 mitogen-activated protein kinase phosphorylation (p-p38MAPK), MMP (matrix metalloproteinase)-1 and MMP-3 expression (p<0.05). It also significantly decreased the interleukin (IL)-6 level compared with the UVB group (p<0.05). In conclusion, these data suggest that the intraperitoneally administered BVD can prevent UVB irradiation-induced skin photo-damage in hairless mice and that this is likely mediated by its antioxidant and anti-inflammatory mechanisms and cell signal regulatory action.
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Affiliation(s)
- Bingxue Bai
- The Department of Dermatology, The Second Affiliated Hospital of Harbin Medical University, Harbin City, Heilongjiang Province 150081, China
| | - Yingdi Liu
- The Department of Dermatology, The Second Affiliated Hospital of Harbin Medical University, Harbin City, Heilongjiang Province 150081, China
| | - Yan You
- The Department of Dermatology, The Third Affiliated Hospital of Harbin Medical University, Harbin City, Heilongjiang Province 150040, China
| | - Yuzhen Li
- The Department of Dermatology, The Second Affiliated Hospital of Harbin Medical University, Harbin City, Heilongjiang Province 150081, China
| | - Liangjuan Ma
- The Department of Dermatology, The Second Affiliated Hospital of Harbin Medical University, Harbin City, Heilongjiang Province 150081, China.
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de Waal PW, Sunden KF, Furge LL. Molecular dynamics of CYP2D6 polymorphisms in the absence and presence of a mechanism-based inactivator reveals changes in local flexibility and dominant substrate access channels. PLoS One 2014; 9:e108607. [PMID: 25286176 PMCID: PMC4186923 DOI: 10.1371/journal.pone.0108607] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 09/01/2014] [Indexed: 11/18/2022] Open
Abstract
Cytochrome P450 enzymes (CYPs) represent an important enzyme superfamily involved in metabolism of many endogenous and exogenous small molecules. CYP2D6 is responsible for ∼ 15% of CYP-mediated drug metabolism and exhibits large phenotypic diversity within CYPs with over 100 different allelic variants. Many of these variants lead to functional changes in enzyme activity and substrate selectivity. Herein, a molecular dynamics comparative analysis of four different variants of CYP2D6 was performed. The comparative analysis included simulations with and without SCH 66712, a ligand that is also a mechanism-based inactivator, in order to investigate the possible structural basis of CYP2D6 inactivation. Analysis of protein stability highlighted significantly altered flexibility in both proximal and distal residues from the variant residues. In the absence of SCH 66712, *34, *17-2, and *17-3 displayed more flexibility than *1, and *53 displayed more rigidity. SCH 66712 binding reversed flexibility in *17-2 and *17-3, through *53 remained largely rigid. Throughout simulations with docked SCH 66712, ligand orientation within the heme-binding pocket was consistent with previously identified sites of metabolism and measured binding energies. Subsequent tunnel analysis of substrate access, egress, and solvent channels displayed varied bottle-neck radii. Taken together, our results indicate that SCH 66712 should inactivate these allelic variants, although varied flexibility and substrate binding-pocket accessibility may alter its interaction abilities.
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Affiliation(s)
- Parker W. de Waal
- Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan, United States of America
| | - Kyle F. Sunden
- Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan, United States of America
| | - Laura Lowe Furge
- Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan, United States of America
- * E-mail:
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20
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Molecular modeling and MM-PBSA free energy analysis of endo-1,4-β-xylanase from Ruminococcus albus 8. Int J Mol Sci 2014; 15:17284-303. [PMID: 25264743 PMCID: PMC4227162 DOI: 10.3390/ijms151017284] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 09/11/2014] [Accepted: 09/15/2014] [Indexed: 11/16/2022] Open
Abstract
Endo-1,4-β-xylanase (EC 3.2.1.8) is the enzyme from Ruminococcus albus 8 (R. albus 8) (Xyn10A), and catalyzes the degradation of arabinoxylan, which is a major cell wall non-starch polysaccharide of cereals. The crystallographic structure of Xyn10A is still unknown. For this reason, we report a computer-assisted homology study conducted to build its three-dimensional structure based on the known sequence of amino acids of this enzyme. In this study, the best similarity was found with the Clostridium thermocellum (C. thermocellum) N-terminal endo-1,4-β-D-xylanase 10 b. Following the 100 ns molecular dynamics (MD) simulation, a reliable model was obtained for further studies. Molecular Mechanics/Poisson-Boltzmann Surface Area (MM-PBSA) methods were used for the substrate xylotetraose having the reactive sugar, which was bound in the -1 subsite of Xyn10A in the 4C1 (chair) and 2SO (skew boat) ground state conformations. According to the simulations and free energy analysis, Xyn10A binds the substrate with the -1 sugar in the 2SO conformation 39.27 kcal·mol(-1) tighter than the substrate with the sugar in the 4C1 conformation. According to the Xyn10A-2SO Xylotetraose (X4(sb) interaction energies, the most important subsite for the substrate binding is subsite -1. The results of this study indicate that the substrate is bound in a skew boat conformation with Xyn10A and the -1 sugar subsite proceeds from the 4C1 conformation through 2SO to the transition state. MM-PBSA free energy analysis indicates that Asn187 and Trp344 in subsite -1 may an important residue for substrate binding. Our findings provide fundamental knowledge that may contribute to further enhancement of enzyme performance through molecular engineering.
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21
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Liu H, Chen L, Li Q, Zheng M, Liu J. Computational study on substrate specificity of a novel cysteine protease 1 precursor from Zea mays. Int J Mol Sci 2014; 15:10459-78. [PMID: 24921705 PMCID: PMC4100162 DOI: 10.3390/ijms150610459] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 05/27/2014] [Accepted: 05/28/2014] [Indexed: 01/26/2023] Open
Abstract
Cysteine protease 1 precursor from Zea mays (zmCP1) is classified as a member of the C1A family of peptidases (papain-like cysteine protease) in MEROPS (the Peptidase Database). The 3D structure and substrate specificity of the zmCP1 is still unknown. This study is the first one to build the 3D structure of zmCP1 by computer-assisted homology modeling. In order to determine the substrate specificity of zmCP1, docking study is used for rapid and convenient analysis of large populations of ligand-enzyme complexes. Docking results show that zmCP1 has preference for P1 position and P2 position for Arg and a large hydrophobic residue (such as Phe). Gly147, Gly191, Cys189, and Asp190 are predicted to function as active residues at the S1 subsite, and the S2 subsite contains Leu283, Leu193, Ala259, Met194, and Ala286. SIFt results indicate that Gly144, Arg268, Trp308, and Ser311 play important roles in substrate binding. Then Molecular Mechanics-Poisson-Boltzmann Surface Area (MM-PBSA) method was used to explain the substrate specificity for P1 position of zmCp1. This study provides insights into the molecular basis of zmCP1 activity and substrate specificity.
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Affiliation(s)
- Huimin Liu
- College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China.
| | - Liangcheng Chen
- Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Changchun 130118, China.
| | - Quan Li
- College of Life Science, Jilin University, Changchun 130023, China.
| | - Mingzhu Zheng
- College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China.
| | - Jingsheng Liu
- College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China.
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22
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Stereoselectivity of chalcone isomerase with chalcone derivatives: a computational study. J Mol Model 2013; 19:4753-61. [DOI: 10.1007/s00894-013-1975-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2012] [Accepted: 08/05/2013] [Indexed: 10/26/2022]
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Ito T, Chen D, Chang CWT, Kenmochi T, Saito T, Suzuki S, Takemoto JY. Mesobiliverdin IXα Enhances Rat Pancreatic Islet Yield and Function. Front Pharmacol 2013; 4:50. [PMID: 23630498 PMCID: PMC3633165 DOI: 10.3389/fphar.2013.00050] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Accepted: 03/31/2013] [Indexed: 11/13/2022] Open
Abstract
The aims of this study were to produce mesobiliverdin IXα, an analog of anti-inflammatory biliverdin IXα, and to test its ability to enhance rat pancreatic islet yield for allograft transplantation into diabetic recipients. Mesobiliverdin IXα was synthesized from phycocyanobilin derived from cyanobacteria, and its identity and purity were analyzed by chromatographic and spectroscopic methods. Mesobiliverdin IXα was a substrate for human NADPH biliverdin reductase. Excised Lewis rat pancreata infused with mesobiliverdin IXα and biliverdin IXα-HCl (1-100 μM) yielded islet equivalents as high as 86.7 and 36.5%, respectively, above those from non-treated controls, and the islets showed a high degree of viability based on dithizone staining. When transplanted into livers of streptozotocin-induced diabetic rats, islets from pancreata infused with mesobiliverdin IXα lowered non-fasting blood glucose (BG) levels in 55.6% of the recipients and in 22.2% of control recipients. In intravenous glucose tolerance tests, fasting BG levels of 56 post-operative day recipients with islets from mesobiliverdin IXα infused pancreata were lower than those for controls and showed responses that indicate recovery of insulin-dependent function. In conclusion, mesobiliverdin IXα infusion of pancreata enhanced yields of functional islets capable of reversing insulin dysfunction in diabetic recipients. Since its production is scalable, mesobiliverdin IXα has clinical potential as a protectant of pancreatic islets for allograft transplantation.
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Affiliation(s)
- Taihei Ito
- Department of Organ Transplant Surgery, School of Medicine, Fujita Health University Toyoake, Aichi, Japan
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