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Charlton MH, Aleksis R, Saint-Leger A, Gupta A, Loza E, Ribas de Pouplana L, Kaula I, Gustina D, Madre M, Lola D, Jaudzems K, Edmund G, Randall CP, Kime L, O’Neill AJ, Goessens W, Jirgensons A, Finn PW. N-Leucinyl Benzenesulfonamides as Structurally Simplified Leucyl-tRNA Synthetase Inhibitors. ACS Med Chem Lett 2018; 9:84-88. [PMID: 29456792 DOI: 10.1021/acsmedchemlett.7b00374] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 01/18/2018] [Indexed: 12/12/2022] Open
Abstract
N-Leucinyl benzenesulfonamides have been discovered as a novel class of potent inhibitors of E. coli leucyl-tRNA synthetase. The binding of inhibitors to the enzyme was measured by using isothermal titration calorimetry. This provided information on enthalpy and entropy contributions to binding, which, together with docking studies, were used for structure-activity relationship analysis. Enzymatic assays revealed that N-leucinyl benzenesulfonamides display remarkable selectivity for E. coli leucyl-tRNA synthetase compared to S. aureus and human orthologues. The simplest analogue of the series, N-leucinyl benzenesulfonamide (R = H), showed the highest affinity against E. coli leucyl-tRNA synthetase and also exhibited antibacterial activity against Gram-negative pathogens (the best MIC = 8 μg/mL, E. coli ATCC 25922), which renders it as a promising template for antibacterial drug discovery.
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Affiliation(s)
- Michael H. Charlton
- Oxford Drug Design Ltd., Oxford Centre for Innovation, New Road, Oxford, OX1 1BY. U.K
| | - Rihards Aleksis
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
| | - Adélaïde Saint-Leger
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Catalonia, Spain
- ICREA, Pg. Lluís Company 23, 08010 Barcelona, Catalonia, Spain
| | - Arya Gupta
- Antimicrobial
Research Centre and School of Molecular and Cellular Biology, Faculty
of Biological Sciences, University of Leeds, Leeds, LS2 9JT, U.K
| | - Einars Loza
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
| | - Lluís Ribas de Pouplana
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Baldiri Reixac, 10, 08028 Barcelona, Catalonia, Spain
- ICREA, Pg. Lluís Company 23, 08010 Barcelona, Catalonia, Spain
| | - Ilze Kaula
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
| | - Daina Gustina
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
| | - Marina Madre
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
| | - Daina Lola
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
| | - Kristaps Jaudzems
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
| | - Grace Edmund
- Oxford Drug Design Ltd., Oxford Centre for Innovation, New Road, Oxford, OX1 1BY. U.K
| | - Christopher P. Randall
- Antimicrobial
Research Centre and School of Molecular and Cellular Biology, Faculty
of Biological Sciences, University of Leeds, Leeds, LS2 9JT, U.K
| | - Louise Kime
- Antimicrobial
Research Centre and School of Molecular and Cellular Biology, Faculty
of Biological Sciences, University of Leeds, Leeds, LS2 9JT, U.K
| | - Alex J. O’Neill
- Antimicrobial
Research Centre and School of Molecular and Cellular Biology, Faculty
of Biological Sciences, University of Leeds, Leeds, LS2 9JT, U.K
| | - Wil Goessens
- Erasmus University Medical Center Rotterdam, Department
of Medical Microbiology and Infectious Diseases, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands
| | - Aigars Jirgensons
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
| | - Paul W. Finn
- Oxford Drug Design Ltd., Oxford Centre for Innovation, New Road, Oxford, OX1 1BY. U.K
- Department
of Applied Computing, University of Buckingham, Hunter Street, Buckingham, MK18 1EG, U.K
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Kuka J, Liepinsh E, Makrecka-Kuka M, Liepins J, Cirule H, Gustina D, Loza E, Zharkova-Malkova O, Grinberga S, Pugovics O, Dambrova M. Suppression of intestinal microbiota-dependent production of pro-atherogenic trimethylamine N-oxide by shifting L-carnitine microbial degradation. Life Sci 2014; 117:84-92. [PMID: 25301199 DOI: 10.1016/j.lfs.2014.09.028] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 08/28/2014] [Accepted: 09/26/2014] [Indexed: 10/24/2022]
Abstract
AIMS Trimethylamine-N-oxide (TMAO) is produced in host liver from trimethylamine (TMA). TMAO and TMA share common dietary quaternary amine precursors, carnitine and choline, which are metabolized by the intestinal microbiota. TMAO recently has been linked to the pathogenesis of atherosclerosis and severity of cardiovascular diseases. We examined the effects of anti-atherosclerotic compound meldonium, an aza-analogue of carnitine bioprecursor gamma-butyrobetaine (GBB), on the availability of TMA and TMAO. MAIN METHODS Wistar rats received L-carnitine, GBB or choline alone or in combination with meldonium. Plasma, urine and rat small intestine perfusate samples were assayed for L-carnitine, GBB, choline and TMAO using UPLC-MS/MS. Meldonium effects on TMA production by intestinal bacteria from L-carnitine and choline were tested. KEY FINDINGS Treatment with meldonium significantly decreased intestinal microbiota-dependent production of TMA/TMAO from L-carnitine, but not from choline. 24hours after the administration of meldonium, the urinary excretion of TMAO was 3.6 times lower in the combination group than in the L-carnitine-alone group. In addition, the administration of meldonium together with L-carnitine significantly increased GBB concentration in blood plasma and in isolated rat small intestine perfusate. Meldonium did not influence bacterial growth and bacterial uptake of L-carnitine, but TMA production by the intestinal microbiota bacteria K. pneumoniae was significantly decreased. SIGNIFICANCE We have shown for the first time that TMA/TMAO production from quaternary amines could be decreased by targeting bacterial TMA-production. In addition, the production of pro-atherogenic TMAO can be suppressed by shifting the microbial degradation pattern of supplemental/dietary quaternary amines.
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Affiliation(s)
- Janis Kuka
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia.
| | - Edgars Liepinsh
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia
| | - Marina Makrecka-Kuka
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia; Rigas Stradins University, Dzirciema Str. 16, Riga, LV-1007, Latvia
| | - Janis Liepins
- University of Latvia, Institute of Microbiology and Biotechnology, Kronvalda Blvd. 4, Riga LV-1586, Latvia
| | - Helena Cirule
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia
| | - Daina Gustina
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia
| | - Einars Loza
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia
| | | | - Solveiga Grinberga
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia
| | - Osvalds Pugovics
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia
| | - Maija Dambrova
- Latvian Institute of Organic Synthesis, Aizkraukles Str. 21, Riga, LV-1006, Latvia; Rigas Stradins University, Dzirciema Str. 16, Riga, LV-1007, Latvia
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Tars K, Leitans J, Kazaks A, Zelencova D, Liepinsh E, Kuka J, Makrecka M, Lola D, Andrianovs V, Gustina D, Grinberga S, Liepinsh E, Kalvinsh I, Dambrova M, Loza E, Pugovics O. Targeting Carnitine Biosynthesis: Discovery of New Inhibitors against γ-Butyrobetaine Hydroxylase. J Med Chem 2014; 57:2213-36. [DOI: 10.1021/jm401603e] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kaspars Tars
- Biomedical Research and Study Centre, Ratsupites 1, LV1067 Riga, Latvia
| | - Janis Leitans
- Biomedical Research and Study Centre, Ratsupites 1, LV1067 Riga, Latvia
| | - Andris Kazaks
- Biomedical Research and Study Centre, Ratsupites 1, LV1067 Riga, Latvia
| | - Diana Zelencova
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Edgars Liepinsh
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Janis Kuka
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Marina Makrecka
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Daina Lola
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Viktors Andrianovs
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Daina Gustina
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Solveiga Grinberga
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Edvards Liepinsh
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Ivars Kalvinsh
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Maija Dambrova
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Einars Loza
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
| | - Osvalds Pugovics
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV1006 Riga, Latvia
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Muzikante I, Gerca L, Fonavs E, Rutkis M, Gustina D, Markava E, Stiller B, Brehmer L, Knochenhauer G. Self-assembled monolayers of azobenzene functionalized 1,3,5-triazine-4,6-dithiols. Materials Science and Engineering: C 2002. [DOI: 10.1016/s0928-4931(02)00220-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Stiller B, Knochenhauer G, Markava E, Gustina D, Muzikante I, Karageorgiev P, Brehmer L. Self-assembled monolayers of novel azobenzenes for optically induced switching. Materials Science and Engineering: C 1999. [DOI: 10.1016/s0928-4931(99)00050-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Markava E, Gustina D, Matisova G, Kaula I, Muzikante I, Rutkis M, Gerca L. Reversible trans/cis photoisomerization in Langmuir-Blodgett multilayers from polyfunctional azobenzenes. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0968-5677(97)00018-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
This study focuses on factors that motivate and demotivate professionals to learn American Sign Language (ASL). Using a qualitative approach known as the Critical Incident Technique (CIT), faculty and staff were asked to reflect on their sign language learning expericences, and their responses were examined for motivational patterns. Principal motivating factors were intrinsic in nature, including a desire to perform well in one's position, personal goals, and an interest in sign language per se. Integrative factors were also important, especially an interest in social interactions with deaf people. Principal factors that demotivated the respondents were more extrinsic in nature, dealing with workload, scheduling issues associated with the sign language curriculum, instruction, and the attitudes of self and others. We draw implications from the findings for the enhancement of sign language instruction programs.
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Affiliation(s)
- H Lang
- National Technical Institue for the Deaf, Rochester Institute of Technology, USA
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Lang H, Foster S, Gustina D, Mowl G, Liu Y. Motivational and attitudinal orientations in learning American Sign Language. J Deaf Stud Deaf Educ 1996; 1:137-144. [PMID: 15579818 DOI: 10.1093/oxfordjournals.deafed.a014287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Integrative motivation was found to correlate significantly with sign language proficiency of adult learners at a post-secondary program for deaf students. Instrumental motives, however, were perceived as less important. Higher achievement in ASL was also associated with a positive cultural attitude toward deaf people. Learning of ASL as a second language may be enhanced if instructors design strategies that build upon these cultural and integrative motives and provide rewarding experiences to adult learners.
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Affiliation(s)
- H Lang
- Department of Educational Research; Office of Communication Assessment Services; Western North Carolina School of the Deaf, USA
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Glezer V, Stradins J, Turovska B, Gustina D, Markava E, Freimanis J. Electrochemical reduction of N-aryl- and N-arylsulphonylbenzoquinoneimines in acetonitrile—III. Electrochemical model of the mechanism of interaction of quinoneimines with Hantzsch ester. Electrochim Acta 1992. [DOI: 10.1016/0013-4686(92)85013-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Stradinš J, Turovska B, Glezer V, Markava E, Gustina D. Electrochemical reduction of N-arylquinoneimines in organic aqueous media. J Electroanal Chem (Lausanne) 1991. [DOI: 10.1016/0022-0728(91)85017-j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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