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Rivara-Espasandín M, Palumbo MC, Sosa EJ, Radío S, Turjanski AG, Sotelo-Silveira J, Fernandez Do Porto D, Smircich P. Omics data integration facilitates target selection for new antiparasitic drugs against TriTryp infections. Front Pharmacol 2023; 14:1136321. [PMID: 37089958 PMCID: PMC10115950 DOI: 10.3389/fphar.2023.1136321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 03/28/2023] [Indexed: 04/09/2023] Open
Abstract
Introduction:Trypanosoma cruzi, Trypanosoma brucei, and Leishmania spp., commonly referred to as TriTryps, are a group of protozoan parasites that cause important human diseases affecting millions of people belonging to the most vulnerable populations worldwide. Current treatments have limited efficiencies and can cause serious side effects, so there is an urgent need to develop new control strategies. Presently, the identification and prioritization of appropriate targets can be aided by integrative genomic and computational approaches.Methods: In this work, we conducted a genome-wide multidimensional data integration strategy to prioritize drug targets. We included genomic, transcriptomic, metabolic, and protein structural data sources, to delineate candidate proteins with relevant features for target selection in drug development.Results and Discussion: Our final ranked list includes proteins shared by TriTryps and covers a range of biological functions including essential proteins for parasite survival or growth, oxidative stress-related enzymes, virulence factors, and proteins that are exclusive to these parasites. Our strategy found previously described candidates, which validates our approach as well as new proteins that can be attractive targets to consider during the initial steps of drug discovery.
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Affiliation(s)
- Martin Rivara-Espasandín
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
- Departamento de Genética, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Miranda Clara Palumbo
- Instituto de Cálculo, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ezequiel J. Sosa
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN) CONICET, Ciudad Universitaria, Buenos Aires, Argentina
| | - Santiago Radío
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
| | - Adrián G. Turjanski
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN) CONICET, Ciudad Universitaria, Buenos Aires, Argentina
| | - José Sotelo-Silveira
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
- Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Dario Fernandez Do Porto
- Instituto de Cálculo, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- *Correspondence: Dario Fernandez Do Porto, ; Pablo Smircich,
| | - Pablo Smircich
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
- Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
- *Correspondence: Dario Fernandez Do Porto, ; Pablo Smircich,
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Petrenko DE, Timofeev VI, Britikov VV, Britikova EV, Kleymenov SY, Vlaskina AV, Kuranova IP, Mikhailova AG, Rakitina TV. First Crystal Structure of Bacterial Oligopeptidase B in an Intermediate State: The Roles of the Hinge Region Modification and Spermine. BIOLOGY 2021; 10:biology10101021. [PMID: 34681120 PMCID: PMC8533160 DOI: 10.3390/biology10101021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/01/2021] [Accepted: 10/05/2021] [Indexed: 11/16/2022]
Abstract
Simple Summary Oligopeptidase B is a two-domain, trypsin-like peptidase from parasitic protozoa and bacteria which belongs to the least studied group of prolyloligopeptidases. In this study, we describe for the first time a crystal structure of bacterial oligopeptidase B and compare it with those of protozoan oligopeptidases B and related prolyloligopeptidases. The enzyme was crystallized in the presence of spermine and contained a modified sequence of the interdomain linker. Both factors were key for crystallization. The structure showed an uncommon intermediate conformation with a domain arrangement intermediate between open and closed conformations found in the crystals of ligand-free and inhibitor-bound prolyloligopeptidases, respectively. To evaluate the impact of the modification and spermine in the obtained conformation, small-angle X-ray scattering was applied, which showed that in solution wild-type enzymes adopt the open conformation and spermine causes a transition to the intermediate state, while the modification is associated with a partial transition. We suggest that spermine-dependent conformational transition replicates the behavior of the enzyme in bacterial cells and the intermediate state, which is rarely detected in vitro, and might be widely distributed in vivo, and so should be considered during computational studies, including those aimed wanting to develop the small molecule inhibitors targeting prolyloligopeptidases. Abstract Oligopeptidase B (OpB) is a two-domain, trypsin-like serine peptidase belonging to the S9 prolyloligopeptidase (POP) family. Two domains are linked by a hinge region that participates in the transition of the enzyme between two major states—closed and open—in which domains and residues of the catalytic triad are located close to each other and separated, respectively. In this study, we described, for the first time, a structure of OpB from bacteria obtained for an enzyme from Serratia proteomaculans with a modified hinge region (PSPmod). PSPmod was crystallized in a conformation characterized by a disruption of the catalytic triad together with a domain arrangement intermediate between open and closed states found in crystals of ligand-free and inhibitor-bound POP, respectively. Two additional derivatives of PSPmod were crystallized in the same conformation. Neither wild-type PSP nor its corresponding mutated variants were susceptible to crystallization, indicating that the hinge region modification was key in the crystallization process. The second key factor was suggested to be polyamine spermine since all crystals were grown in its presence. The influences of the hinge region modification and spermine on the conformational state of PSP in solution were evaluated by small-angle X-ray scattering. SAXS showed that, in solution, wild-type PSP adopted the open state, spermine caused the conformational transition to the intermediate state, and spermine-free PSPmod contained molecules in the open and intermediate conformations in dynamic equilibrium.
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Affiliation(s)
- Dmitry E. Petrenko
- National Research Center “Kurchatov Institute”, 123182 Moscow, Russia; (D.E.P.); (A.V.V.)
| | - Vladimir I. Timofeev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, RAS, 117997 Moscow, Russia;
- Federal Scientific Research Center “Crystallography and Photonics”, RAS, 119333 Moscow, Russia;
- Correspondence: (V.I.T.); (T.V.R.)
| | - Vladimir V. Britikov
- Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, 220141 Minsk, Belarus; (V.V.B.); (E.V.B.)
| | - Elena V. Britikova
- Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, 220141 Minsk, Belarus; (V.V.B.); (E.V.B.)
| | - Sergey Y. Kleymenov
- Bach Institute of Biochemistry, Federal Research Center “Fundamentals of Biotechnology”, RAS, 119071 Moscow, Russia;
- Koltzov Institute of Developmental Biology, RAS, 119334 Moscow, Russia
| | - Anna V. Vlaskina
- National Research Center “Kurchatov Institute”, 123182 Moscow, Russia; (D.E.P.); (A.V.V.)
| | - Inna P. Kuranova
- Federal Scientific Research Center “Crystallography and Photonics”, RAS, 119333 Moscow, Russia;
| | - Anna G. Mikhailova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, RAS, 117997 Moscow, Russia;
| | - Tatiana V. Rakitina
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, RAS, 117997 Moscow, Russia;
- Correspondence: (V.I.T.); (T.V.R.)
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Fu Z, Fan G, Zhu Y, Teng C, Li H, Liu Q, Yang R, Li X. Soluble expression of a novel feruloyl esterase from Burkholderia pyrrocinia B1213 in Escherichia coli and optimization of production conditions. BIOTECHNOL BIOTEC EQ 2020. [DOI: 10.1080/13102818.2020.1803129] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Zhilei Fu
- Laboratory of Food Microbiology and Enzyme Engineering, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, PR China
- Laboratory of Food Microbiology and Enzyme Engineering, School of Food and Health, Beijing Technology and Business University, Beijing, PR China
| | - Guangsen Fan
- Laboratory of Food Microbiology and Enzyme Engineering, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, PR China
- Laboratory of Food Microbiology and Enzyme Engineering, School of Food and Health, Beijing Technology and Business University, Beijing, PR China
| | - Yuting Zhu
- Laboratory of Food Microbiology and Enzyme Engineering, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, PR China
- Laboratory of Food Microbiology and Enzyme Engineering, School of Food and Health, Beijing Technology and Business University, Beijing, PR China
| | - Chao Teng
- Laboratory of Food Microbiology and Enzyme Engineering, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, PR China
- Laboratory of Food Microbiology and Enzyme Engineering, School of Food and Health, Beijing Technology and Business University, Beijing, PR China
| | - Hehe Li
- Laboratory of Food Microbiology and Enzyme Engineering, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, PR China
- Laboratory of Food Microbiology and Enzyme Engineering, School of Food and Health, Beijing Technology and Business University, Beijing, PR China
| | - Qian Liu
- Beijing Key Laboratory of Bioactive Substances and Functional Foods, College of Biochemical Engineering, Beijing Union University, Beijing, PR China
| | - Ran Yang
- Laboratory of Food Microbiology and Enzyme Engineering, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, PR China
- Laboratory of Food Microbiology and Enzyme Engineering, School of Food and Health, Beijing Technology and Business University, Beijing, PR China
| | - Xiuting Li
- Laboratory of Food Microbiology and Enzyme Engineering, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, PR China
- Laboratory of Food Microbiology and Enzyme Engineering, School of Food and Health, Beijing Technology and Business University, Beijing, PR China
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Motta FN, Azevedo CDS, Neves BP, Araújo CND, Grellier P, Santana JMD, Bastos IMD. Oligopeptidase B, a missing enzyme in mammals and a potential drug target for trypanosomatid diseases. Biochimie 2019; 167:207-216. [DOI: 10.1016/j.biochi.2019.10.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 10/15/2019] [Indexed: 12/21/2022]
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Petrenko DE, Mikhailova AG, Timofeev VI, Agapova YК, Karlinsky DM, Komolov AS, Korzhenevskiy DA, Vlaskina AV, Rumsh LD, Rakitina TV. Molecular dynamics complemented by site-directed mutagenesis reveals significant difference between the interdomain salt bridge networks stabilizing oligopeptidases B from bacteria and protozoa in their active conformations. J Biomol Struct Dyn 2019; 38:4868-4882. [PMID: 31724904 DOI: 10.1080/07391102.2019.1692694] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Oligopeptidases B (OpdBs) are trypsin-like peptidases from protozoa and bacteria that belong to the prolyl oligopeptidase (POP) family. All POPs consist of C-terminal catalytic domain and N-terminal β-propeller domain and exist in two major conformations: closed (active), where the domains and residues of the catalytic triad are positioned close to each other, and open (non-active), where two domains and residues of the catalytic triad are separated. The interdomain interface, particularly, one of its salt bridges (SB1), plays a role in the transition between these two conformations. However, due to double amino acid substitution (E/R and R/Q), this functionally important SB1 is absent in γ-proteobacterial OpdBs including peptidase from Serratia proteamaculans (PSP). In this study, molecular dynamics was used to analyze inter- and intradomain interactions stabilizing PSP in the closed conformation, in which catalytic H652 is located close to other residues of the catalytic triad. The 3D models of either wild-type PSP or of mutant PSPs carrying activating mutations E125A and D649A in complexes with peptide-substrates were subjected to the analysis. The mechanism that regulates transition of H652 from active to non-active conformation upon domain separation in PSP and other γ-proteobacterial OpdB was proposed. The complex network of polar interactions within H652-loop/C-terminal α-helix and between these areas and β-propeller domain, established in silico, was in a good agreement with both previously published results on the effects of single-residue mutations and new data on the effects of the activating mutations on each other and on the low active mutant PSP-K655A.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Dmitry E Petrenko
- National Research Center "Kurchatov Institute", Moscow, Russian Federation
| | - Anna G Mikhailova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | - Vladimir I Timofeev
- National Research Center "Kurchatov Institute", Moscow, Russian Federation.,Shubnikov Institute of Crystallography of Federal Scientific Research Centre "Crystallography and Photonics", Russian Academy of Sciences, Moscow, Russian Federation
| | - Yulia К Agapova
- National Research Center "Kurchatov Institute", Moscow, Russian Federation
| | - David M Karlinsky
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | - Aleksandr S Komolov
- National Research Center "Kurchatov Institute", Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region, Russian Federation
| | | | - Anna V Vlaskina
- National Research Center "Kurchatov Institute", Moscow, Russian Federation
| | - Lev D Rumsh
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | - Tatiana V Rakitina
- National Research Center "Kurchatov Institute", Moscow, Russian Federation.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
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Mikhailova AG, Rakitina TV, Timofeev VI, Karlinsky DM, Korzhenevskiy DA, Agapova YК, Vlaskina AV, Ovchinnikova MV, Gorlenko VA, Rumsh LD. Activity modulation of the oligopeptidase B from Serratia proteamaculans by site-directed mutagenesis of amino acid residues surrounding catalytic triad histidine. Biochimie 2017; 139:125-136. [DOI: 10.1016/j.biochi.2017.05.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 05/15/2017] [Accepted: 05/17/2017] [Indexed: 11/16/2022]
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Mikhailova AG, Nekrasov AN, Zinchenko AA, Rakitina TV, Korzhenevsky DA, Lipkin AV, Razguljaeva OA, Ovchinnikova MV, Gorlenko VA, Rumsh LD. Truncated Variants of Serratia proteamaculans Oligopeptidase B Having Different Activities. BIOCHEMISTRY (MOSCOW) 2016; 80:1331-43. [PMID: 26567578 DOI: 10.1134/s0006297915100156] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Treatment of native psychrophilic oligopeptidase B from Serratia proteamaculans (PSP, 78 kDa) with chymotrypsin (soluble or immobilized on modified porous glass MPG-PA) in the presence of 50% glycerol leads to production of a truncated enzyme form (PSP-Chtr, ~66 kDa), which retains activity toward the low molecular weight substrate of PSP, BAPNA, but in contrast to PSP, is active toward the protein substrate azocasein. It has been shown by MALDI-TOF mass-spectrometry that PSP-Chtr lacks the N-terminal region of the molecule that envelops the catalytic domain of PSP and supposedly prevents hydrolysis of high molecular weight substrates. It has also been established that the lacking fragment corresponds to the N-terminal highest rank element of the informational structure of PSP. This finding confirms the usefulness of the method of informational structure analysis for protein engineering of enzymes. A similar treatment of PSP with immobilized trypsin also led to production of a stable truncated enzyme form (PSP-Tr, ~75 kDa) which lacked 22 C-terminal amino acid residues and completely lost enzymatic activity, presumably because of changes in the nearest environment of His652 of the catalytic triad.
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Affiliation(s)
- A G Mikhailova
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997, Russia.
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Mikhailova AG, Khairullin RF, Demidyuk IV, Kostrov SV, Grinberg NV, Burova TV, Grinberg VY, Rumsh LD. Cloning, sequencing, expression, and characterization of thermostability of oligopeptidase B from Serratia proteamaculans, a novel psychrophilic protease. Protein Expr Purif 2014; 93:63-76. [DOI: 10.1016/j.pep.2013.10.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Revised: 10/16/2013] [Accepted: 10/18/2013] [Indexed: 11/30/2022]
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Kalnciema I, Skrastina D, Ose V, Pumpens P, Zeltins A. Potato virus Y-like particles as a new carrier for the presentation of foreign protein stretches. Mol Biotechnol 2013; 52:129-39. [PMID: 22167454 DOI: 10.1007/s12033-011-9480-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Virus-like particle (VLP) technology represents a promising approach for the creation of efficient vaccines and materials for use in nanotechnological applications. For construction of a new carrier for foreign protein sequences, the coat protein (CP) gene from potato virus Y (PVY) was cloned and expressed in Escherichia coli cells. The PVY CP self-assembles into PVY-like particles, as demonstrated by electron microscopy analysis of purified VLP preparations. The PVY CP with an N-terminal insertion of a foreign epitope (preS1) or of a whole protein (rubredoxin) retains its ability to form filamentous particles, whereas adding a foreign sequence to the C-terminus of the PVY CP generates mostly unstructured protein aggregates. This new filamentous plant virus-derived VLP carrier accommodates a foreign protein sequence that is up to 71 amino acids in length on the VLP surface and can be produced in E. coli in preparative amounts. The PVY CP VLPs are stable in physiological conditions, but they are sensitive to EDTA, high salt, and extreme pH. The presence of the preS1 epitope decreases the stability of the chimeric PVY CP particles at elevated temperatures. Mice that are immunized with chimeric PVY CP particles carrying preS1 epitopes exhibit a strong anti-preS1 immune response, even in the absence of adjuvants.
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Affiliation(s)
- Ieva Kalnciema
- Latvian Biomedical Research and Study Centre, Ratsupites 1, Riga LV-1067, Latvia.
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Mikhailova AG, Khairullin RF, Kolomijtseva GY, Rumsh LD. Oligopeptidase B from Serratia proteamaculans. III. Inhibition analysis. Specific interactions with metalloproteinase inhibitors. BIOCHEMISTRY (MOSCOW) 2012; 77:300-6. [DOI: 10.1134/s0006297912030091] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Mikhailova AG, Khairullin RF, Demidyuk IV, Gromova TY, Kostrov SV, Rumsh LD. Oligopeptidase B from Serratia proteamaculans. II. Enzymatic characteristics: Substrate analysis, influence of calcium ions, pH and temperature dependences. BIOCHEMISTRY (MOSCOW) 2011; 76:480-90. [DOI: 10.1134/s0006297911040122] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Khairullin RF, Mikhailova AG, Sebyakina TY, Lubenets NL, Ziganshin RH, Demidyuk IV, Gromova TY, Kostrov SV, Rumsh LD. Oligopeptidase B from Serratia proteamaculans. I. Determination of primary structure, isolation, and purification of wild-type and recombinant enzyme variants. BIOCHEMISTRY (MOSCOW) 2009; 74:1164-72. [DOI: 10.1134/s0006297909100137] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Oligopeptidase B: A processing peptidase involved in pathogenesis. Biochimie 2008; 90:336-44. [DOI: 10.1016/j.biochi.2007.10.011] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2007] [Accepted: 10/25/2007] [Indexed: 11/20/2022]
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Yu WY, Yang LX, Xie JS, Zhou L, Jiang XY, Zhu DX, Muramatsu M, Wang MW. Derivatives of aryl-4-guanidinomethylbenzoate and N-aryl-4-guanidinomethylbenzamide as new antibacterial agents: synthesis and bioactivity. Acta Pharmacol Sin 2008; 29:267-77. [PMID: 18215358 DOI: 10.1111/j.1745-7254.2008.00720.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
AIM The aim of the present study was to design, synthesize, and evaluate novel antibacterial agents, derivatives of aryl-4-guanidinomethylbenzoate and N-aryl-4-guanidinomethylbenzamide. METHODS A total of 44 derivatives of aryl-4-guanidin-omethylbenzoate (series A) and N-aryl-4-guanidinomethylbenzamide (series B) were synthesized and their antibacterial activities were assessed in vitro against a variety of Gram-positive and Gram-negative bacteria by an agar dilution method. RESULTS Twelve compounds showed potent bactericidal effects against a panel of Gram-positive germs, including methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), vancomycin-intermediate Staphylococcus aureus (VISA), and methicillin-resistant coagulase-negative staphylococci (MRCNS), with minimum inhibitory concentrations (MIC) ranging between 0.5 and 8 microg/mL, which were comparable to the MIC values of several marketed antibiotics. They exhibited weak or no activity on the Gram-negative bacteria tested. In addition, these compounds displayed high inhibitory activities towards oligopeptidase B of bacterial origin. CONCLUSION In comparison with the previously reported MIC values of several known antibiotics, the derivatives of aryl-4-guanidinomethylbenzoate and N-aryl-4-guanidinomethylbenzamide showed comparable in vitro bactericidal activities against VRE and VISA as linezolid. Their growth inhibitory effects on MRSA were similar to vancomycin, but were less potent than linezolid and vancomycin against MRCNS. This class of compounds may have the potential to be developed into narrow spectrum antibacterial agents against certain drug-resistant strains of bacteria.
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Affiliation(s)
- Wen-yuan Yu
- The National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
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Sheng J, Yu H, Li J, Sheng G, Zhou L, Lu Y. Cloning and expression of the human augmenter of liver regeneration at low temperature in Escherichia coli. ACTA ACUST UNITED AC 2007; 70:465-70. [PMID: 17210184 DOI: 10.1016/j.jbbm.2006.11.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2006] [Revised: 11/17/2006] [Accepted: 11/17/2006] [Indexed: 10/23/2022]
Abstract
Acute and chronic hepatic failure is a devastating illness of varied causes with considerable mortality. Human augmenter of liver regeneration (hALR) is a hepatotrophic protein and the unique cytokine which can specially stimulate hepatic origin cells to grow regardless of genus. It has been proven that ALR can promote regeneration and avoid all kinds of injury in rat and canine models. In this study, the recombinant protein hALR was expressed successfully with recombinant prokaryotic expression vector pET28a(+) in Escherichia coli BL21 (DE3). We constructed the recombinant expression vector pET28a(+)/hALR with a full-length cDNA encoding hALR protein from normal human liver tissue by one-step reverse transcription-polymerase chain reaction and his-tag recognition sequence encoding polyhistidine (6 x His). Under IPTG (isopropyl-beta-d-thiogalactopyranoside) induction for 2 h at 37 degrees C, recombinant protein hALR was expressed. The expression of recombinant polyhistidine-tagged hALR was increased under low temperature and was confirmed that the temperature of 23 degrees C was the most suitable IPTG induction condition. Under low temperature induction of IPTG, recombinant protein can be expressed as a soluble protein. Recombinant protein hALR was also purified with His Bind Kits and characterized with SDS-PAGE and Western blotting. The results showed that recombinant hALR could be expressed as a soluble protein under low temperature induction of IPTG. The successful expression of ALR in E. coli makes it possible to further study its biological function and purified recombinant hALR could be developed into a new anti-hepatic damage product.
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Affiliation(s)
- Jifang Sheng
- Department of Infectious Disease, the First Affiliated Hospital, College of Medicine, Zhejiang University, Key Lab. of Infectious Disease of Ministry of Health, Qingchun Rd. 79, Hangzhou, 310003, China.
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