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Atanasov KE, Barboza-Barquero L, Tiburcio AF, Alcázar R. Genome Wide Association Mapping for the Tolerance to the Polyamine Oxidase Inhibitor Guazatine in Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2016; 7:401. [PMID: 27092150 PMCID: PMC4820465 DOI: 10.3389/fpls.2016.00401] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 03/14/2016] [Indexed: 05/09/2023]
Abstract
Guazatine is a potent inhibitor of polyamine oxidase (PAO) activity. In agriculture, guazatine is used as non-systemic contact fungicide efficient in the protection of cereals and citrus fruits against disease. The composition of guazatine is complex, mainly constituted by a mixture of synthetic guanidated polyamines (polyaminoguanidines). Here, we have studied the effects from exposure to guazatine in the weed Arabidopsis thaliana. We report that micromolar concentrations of guazatine are sufficient to inhibit growth of Arabidopsis seedlings and induce chlorosis, whereas germination is barely affected. We observed the occurrence of quantitative variation in the response to guazatine between 107 randomly chosen Arabidopsis accessions. This enabled us to undertake genome-wide association (GWA) mapping that identified a locus on chromosome one associated with guazatine tolerance. CHLOROPHYLLASE 1 (CLH1) within this locus was studied as candidate gene, together with its paralog (CLH2). The analysis of independent clh1-2, clh1-3, clh2-3, clh2-2, and double clh1-2 clh2-3 mutant alleles indicated that CLH1 and/or CLH2 loss-of-function or expression down-regulation promote guazatine tolerance in Arabidopsis. We report a natural mechanism by which Arabidopsis populations can overcome toxicity by the fungicide guazatine.
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Affiliation(s)
- Kostadin E. Atanasov
- Laboratory of Plant Physiology, Department of Natural Products, Plant Biology and Soil Science, Faculty of Pharmacy, University of BarcelonaBarcelona, Spain
| | - Luis Barboza-Barquero
- Centro para Investigaciones en Granos y Semillas, Universidad de Costa RicaSan José, Costa Rica
| | - Antonio F. Tiburcio
- Laboratory of Plant Physiology, Department of Natural Products, Plant Biology and Soil Science, Faculty of Pharmacy, University of BarcelonaBarcelona, Spain
| | - Rubén Alcázar
- Laboratory of Plant Physiology, Department of Natural Products, Plant Biology and Soil Science, Faculty of Pharmacy, University of BarcelonaBarcelona, Spain
- *Correspondence: Rubén Alcázar
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Zahnow C, Topper M, Stone M, Murray-Stewart T, Li H, Baylin S, Casero R. Inhibitors of DNA Methylation, Histone Deacetylation, and Histone Demethylation: A Perfect Combination for Cancer Therapy. Adv Cancer Res 2016; 130:55-111. [PMID: 27037751 DOI: 10.1016/bs.acr.2016.01.007] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Epigenetic silencing and inappropriate activation of gene expression are frequent events during the initiation and progression of cancer. These events involve a complex interplay between the hypermethylation of CpG dinucleotides within gene promoter and enhancer regions, the recruitment of transcriptional corepressors and the deacetylation and/or methylation of histone tails. These epigenetic regulators act in concert to block transcription or interfere with the maintenance of chromatin boundary regions. However, DNA/histone methylation and histone acetylation states are reversible, enzyme-mediated processes and as such, have emerged as promising targets for cancer therapy. This review will focus on the potential benefits and synergistic/additive effects of combining DNA-demethylating agents and histone deacetylase inhibitors or lysine-specific demethylase inhibitors together in epigenetic therapy for solid tumors and will highlight what is known regarding the mechanisms of action that contribute to the antitumor response.
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Thinnes CC, England KS, Kawamura A, Chowdhury R, Schofield CJ, Hopkinson RJ. Targeting histone lysine demethylases - progress, challenges, and the future. BIOCHIMICA ET BIOPHYSICA ACTA 2014; 1839:1416-32. [PMID: 24859458 PMCID: PMC4316176 DOI: 10.1016/j.bbagrm.2014.05.009] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Revised: 05/06/2014] [Accepted: 05/13/2014] [Indexed: 12/20/2022]
Abstract
N-Methylation of lysine and arginine residues has emerged as a major mechanism of transcriptional regulation in eukaryotes. In humans, N(ε)-methyllysine residue demethylation is catalysed by two distinct subfamilies of demethylases (KDMs), the flavin-dependent KDM1 subfamily and the 2-oxoglutarate- (2OG) dependent JmjC subfamily, which both employ oxidative mechanisms. Modulation of histone methylation status is proposed to be important in epigenetic regulation and has substantial medicinal potential for the treatment of diseases including cancer and genetic disorders. This article provides an introduction to the enzymology of the KDMs and the therapeutic possibilities and challenges associated with targeting them, followed by a review of reported KDM inhibitors and their mechanisms of action from kinetic and structural perspectives.
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Affiliation(s)
- Cyrille C Thinnes
- The Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | | | - Akane Kawamura
- The Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
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Murray-Stewart T, Woster PM, Casero RA. The re-expression of the epigenetically silenced e-cadherin gene by a polyamine analogue lysine-specific demethylase-1 (LSD1) inhibitor in human acute myeloid leukemia cell lines. Amino Acids 2013; 46:585-94. [PMID: 23508577 DOI: 10.1007/s00726-013-1485-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 02/26/2013] [Indexed: 12/19/2022]
Abstract
Aberrant epigenetic silencing of tumor suppressor genes is a common feature observed during the transformation process of many cancers, including those of hematologic origin. Histone modifications, including acetylation, phosphorylation, and methylation, collaborate with DNA CpG island methylation to regulate gene expression. The dynamic process of histone methylation is the latest of these epigenetic modifications to be described, and the identification and characterization of LSD1 as a demethylase of lysine 4 of histone H3 (H3K4) has confirmed that both the enzyme and the modified histone play important roles as regulators of gene expression. LSD1 activity contributes to the suppression of gene expression by demethylating promoter-region mono- and dimethyl-H3K4 histone marks that are associated with active gene expression. As most post-translational modifications are reversible, the enzymes involved in the modification of histones have become targets for chemotherapeutic intervention. In this study, we examined the effects of the polyamine analogue LSD1 inhibitor 2d (1,15-bis{N (5)-[3,3-(diphenyl)propyl]-N(1)-biguanido}-4,12-diazapentadecane) in human acute myeloid leukemia (AML) cell lines. In each line studied, 2d evoked cytotoxicity and inhibited LSD1 activity, as evidenced by increases in the global levels of mono- and di-methylated H3K4 proteins. Global increases in other chromatin modifications were also observed following exposure to 2d, suggesting a broad response to this compound with respect to chromatin regulation. On a gene-specific level, treatment with 2d resulted in the re-expression of e-cadherin, a tumor suppressor gene frequently silenced by epigenetic modification in AML. Quantitative chromatin immunoprecipitation analysis of the e-cadherin promoter further confirmed that this re-expression was concurrent with changes in both active and repressive histone marks that were consistent with LSD1 inhibition. As hematologic malignancies have demonstrated promising clinical responses to agents targeting epigenetic silencing, this polyamine analogue LSD1 inhibitor presents an exciting new avenue for the development of novel therapeutic agents for the treatment of AML.
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Affiliation(s)
- Tracy Murray-Stewart
- The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Bunting Blaustein Bldg, Room 551, 1650 Orleans Street, Baltimore, MD, 21287, USA
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Polyamines and cancer: implications for chemotherapy and chemoprevention. Expert Rev Mol Med 2013; 15:e3. [PMID: 23432971 DOI: 10.1017/erm.2013.3] [Citation(s) in RCA: 214] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Polyamines are small organic cations that are essential for normal cell growth and development in eukaryotes. Under normal physiological conditions, intracellular polyamine concentrations are tightly regulated through a dynamic network of biosynthetic and catabolic enzymes, and a poorly characterised transport system. This precise regulation ensures that the intracellular concentration of polyamines is maintained within strictly controlled limits. It has frequently been observed that the metabolism of, and the requirement for, polyamines in tumours is frequently dysregulated. Elevated levels of polyamines have been associated with breast, colon, lung, prostate and skin cancers, and altered levels of rate-limiting enzymes in both biosynthesis and catabolism have been observed. Based on these observations and the absolute requirement for polyamines in tumour growth, the polyamine pathway is a rational target for chemoprevention and chemotherapeutics. Here we describe the recent advances made in the polyamine field and focus on the roles of polyamines and polyamine metabolism in neoplasia through a discussion of the current animal models for the polyamine pathway, chemotherapeutic strategies that target the polyamine pathway, chemotherapeutic clinical trials for polyamine pathway-specific drugs and ongoing clinical trials targeting polyamine biosynthesis.
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Chaturvedi R, de Sablet T, Peek RM, Wilson KT. Spermine oxidase, a polyamine catabolic enzyme that links Helicobacter pylori CagA and gastric cancer risk. Gut Microbes 2012; 3:48-56. [PMID: 22555547 PMCID: PMC3337125 DOI: 10.4161/gmic.19345] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
We have recently reported that Helicobacter pylori strains expressing the virulence factor cytotoxin-associated gene A (CagA) stimulate increased levels of spermine oxidase (SMO) in gastric epithelial cells, while cagA⁻ strains did not. SMO catabolizes the polyamine spermine and produces H₂O₂ that results in both apoptosis and DNA damage. Exogenous overexpression of CagA confirmed these findings, and knockdown or inhibition of SMO blocked CagA-mediated apoptosis and DNA damage. The strong association of SMO, apoptosis, and DNA damage was also demonstrated in humans infected with cagA⁺, but not cagA⁻ strains. In infected gerbils and mice, DNA damage was CagA-dependent and only present in epithelial cells that expressed SMO. We also discovered SMO (high) gastric epithelial cells from infected animals with dysplasia that are resistant to apoptosis despite high levels of DNA damage. Inhibition of polyamine synthesis or SMO could abrogate the development of this cell population that may represent precursors for neoplastic transformation.
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Affiliation(s)
- Rupesh Chaturvedi
- Division of Gastroenterology, Hepatology, and Nutrition; Department of Medicine; Vanderbilt University Medical Center; Nashville, TN USA
- Veterans Affairs; Tennessee Valley Healthcare System; Nashville, TN USA
| | - Thibaut de Sablet
- Division of Gastroenterology, Hepatology, and Nutrition; Department of Medicine; Vanderbilt University Medical Center; Nashville, TN USA
- Veterans Affairs; Tennessee Valley Healthcare System; Nashville, TN USA
| | - Richard M. Peek
- Division of Gastroenterology, Hepatology, and Nutrition; Department of Medicine; Vanderbilt University Medical Center; Nashville, TN USA
- Veterans Affairs; Tennessee Valley Healthcare System; Nashville, TN USA
- Department of Cancer Biology; Vanderbilt University Medical Center; Nashville, TN USA
| | - Keith T. Wilson
- Division of Gastroenterology, Hepatology, and Nutrition; Department of Medicine; Vanderbilt University Medical Center; Nashville, TN USA
- Veterans Affairs; Tennessee Valley Healthcare System; Nashville, TN USA
- Department of Cancer Biology; Vanderbilt University Medical Center; Nashville, TN USA
- Department of Pathology, Microbiology, and Immunology; Vanderbilt University Medical Center; Nashville, TN USA
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Takao K, Shibata S, Ozawa T, Wada M, Sugitia Y, Samejima K, Shirahata A. A conceptual model of the polyamine binding site of N1-acetylpolyamine oxidase developed from a study of polyamine derivatives. Amino Acids 2008; 37:401-5. [PMID: 18712272 DOI: 10.1007/s00726-008-0168-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2008] [Accepted: 07/28/2008] [Indexed: 12/01/2022]
Abstract
We used various polyamine derivatives to study the substrate binding site of N1-acetylpolyamine oxidase (PAO) that was partially purified from rat liver. The substrate activities of acetylpolyamines indicated the presence of two anionic centers corresponding to the 1,3-diaminopropane (1,3-DAP) structure and a hydrophobic region in addition to the cleavage site of the acetamidopropyl group. Based on the results of the inhibitory activities of 1,3-DAP derivatives, we developed a conceptual model of the polyamine binding site of PAO. We used this model to identify a potent competitive inhibitor, N1,N7-dihexyl-1,7-diamino-4-azaheptane, and to develop an affinity column, 1,16-diamino4,13-diazahexadecane-linked Sepharose, which was useful for the purification of PAO.
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Affiliation(s)
- Koichi Takao
- Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan.
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Huang Y, Greene E, Murray Stewart T, Goodwin AC, Baylin SB, Woster PM, Casero RA. Inhibition of lysine-specific demethylase 1 by polyamine analogues results in reexpression of aberrantly silenced genes. Proc Natl Acad Sci U S A 2007; 104:8023-8. [PMID: 17463086 PMCID: PMC1857229 DOI: 10.1073/pnas.0700720104] [Citation(s) in RCA: 242] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Epigenetic chromatin modification is a major regulator of eukaryotic gene expression, and aberrant epigenetic silencing of gene expression contributes to tumorigenesis. Histone modifications include acetylation, phosphorylation, and methylation, resulting in a combination of histone marks known collectively as the histone code. The chromatin marks at a given promoter determine, in part, whether specific promoters are in an open/active conformation or closed/repressed conformation. Dimethyl-lysine 4 histone H3 (H3K4me2) is a transcription-activating chromatin mark at gene promoters, and demethylation of this mark by the lysine-specific demethylase 1 (LSD1), a homologue of polyamine oxidases, may broadly repress gene expression. We now report that novel biguanide and bisguanidine polyamine analogues are potent inhibitors of LSD1. These analogues inhibit LSD1 in human colon carcinoma cells and affect a reexpression of multiple, aberrantly silenced genes important in the development of colon cancer, including members of the secreted frizzle-related proteins (SFRPs) and the GATA family of transcription factors. Furthermore, we demonstrate by chromatin immunoprecipitation analysis that the reexpression is concurrent with increased H3K4me2 and acetyl-H3K9 marks, decreased H3K9me1 and H3K9me2 repressive marks. We thus define important new agents for reversing aberrant repression of gene transcription.
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Affiliation(s)
- Yi Huang
- *The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Johns Hopkins University School of Medicine, Bunting–Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231; and
| | - Eriko Greene
- *The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Johns Hopkins University School of Medicine, Bunting–Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231; and
| | - Tracy Murray Stewart
- *The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Johns Hopkins University School of Medicine, Bunting–Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231; and
| | - Andrew C. Goodwin
- *The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Johns Hopkins University School of Medicine, Bunting–Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231; and
| | - Stephen B. Baylin
- *The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Johns Hopkins University School of Medicine, Bunting–Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231; and
| | - Patrick M. Woster
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI 48202
| | - Robert A. Casero
- *The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Johns Hopkins University School of Medicine, Bunting–Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231; and
- To whom correspondence should be addressed at:
The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Bunting–Blaustein Cancer Research Building, Room 551, 1650 Orleans Street, Baltimore, MD 21231. E-mail:
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Sebela M, Tylichová M, Pec P. Inhibition of diamine oxidases and polyamine oxidases by diamine-based compounds. J Neural Transm (Vienna) 2007; 114:793-8. [PMID: 17385064 DOI: 10.1007/s00702-007-0690-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2006] [Accepted: 11/20/2006] [Indexed: 11/25/2022]
Abstract
This review reports on inhibitors of copper-containing amine oxidases and flavoprotein polyamine oxidases, which are structurally based on diamines. In the introduction, basic characteristics and classification of amine oxidases are described together with the significance of their synthetic inhibitors. The following text is divided into several chapters, which deal with diaminoketones, aza-diamines, unsaturated diamine analogs and diamines with heterocyclic substituents. Then it continues with diamine- and agmatine-based inhibitors of polyamine oxidases. Each chapter gives detailed information on the inhibition mode, potency and structural relationships. The conclusion points out possible roles of mechanism-based inhibitors of amine oxidases in physiological and medicinal research.
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Affiliation(s)
- M Sebela
- Department of Biochemistry, Faculty of Science, Palacký University, Olomouc, Czech Republic
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Khomutov AR, Simonian AR, Vespalainen J, Keinanen TA, Alhonen L, Janne J. [New oxaanalogues of spermine]. BIOORGANICHESKAIA KHIMIIA 2005; 31:206-12. [PMID: 15889796 DOI: 10.1007/s11171-005-0026-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new isosteric charge-deficient spermine analogue, 1,12-diamino-4,9-diaza-5-oxadodecan, and O-(7-amino-4-azaheptyl)oxime of 3-aminopropanal, a stable analogue of the Schiff base intermediate in the enzymatic oxidation of spermine, were synthesized. The possible use of these compounds for the inhibition of spermine oxidase is discussed.
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Bellelli A, Cavallo S, Nicolini L, Cervelli M, Bianchi M, Mariottini P, Zelli M, Federico R. Mouse spermine oxidase: a model of the catalytic cycle and its inhibition by N,N1-bis(2,3-butadienyl)-1,4-butanediamine. Biochem Biophys Res Commun 2004; 322:1-8. [PMID: 15313165 DOI: 10.1016/j.bbrc.2004.07.074] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2004] [Indexed: 11/18/2022]
Abstract
Spermine oxidase (SMO) is a recently described flavoenzyme belonging to the class of polyamine oxidases (PAOs) and participating in the polyamine metabolism in animal cells. In this paper we describe the expression, purification, and characterization of the catalytic properties of a recombinant mouse SMO (mSMO). The purified enzyme has absorbance peaks at 457nm (epsilon=11mM(-1)cm(-1)) and 378nm, shows a molecular mass of approximately 63kDa, and has K(m) and k(cat) values of 170microM and 4.8s(-1), using spermine as substrate; it is unable to oxidize other free or acetylated polyamines. The mechanism-based PAO inhibitor N,N(1)-bis(2,3-butadienyl)-1,4-butanediamine (MDL72,527) acts as a competitive inhibitor of mSMO, with an apparent dissociation constant K(i)=63microM. If incubated for longer times, MDL72,527 yields irreversible inhibition of the enzyme with a half-life of 15min at 100microM MDL72,527. The mMSO catalytic mechanism, investigated by stopped flow, is consistent with a simple four-step kinetic scheme.
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Affiliation(s)
- Andrea Bellelli
- Dipartimento di Scienze Biochimiche Alessandro Rossi Fanelli, Università di Roma La Sapienza and Istituto di Biologia e Patologia Molecolari del CNR, I-00185 Rome, Italy.
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Ascenzi P, Fasano M, Marino M, Venturini G, Federico R. Agmatine oxidation by copper amine oxidase. EUROPEAN JOURNAL OF BIOCHEMISTRY 2002; 269:884-92. [PMID: 11846789 DOI: 10.1046/j.0014-2956.2002.02718.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The product of agmatine oxidation catalyzed by Pisum sativum L. copper amine oxidase has been identified by means of one- and two-dimensional (1)H-NMR spectroscopy to be N-amidino-2-hydroxypyrrolidine. This compound inhibits competitively rat nitric oxide synthase type I and type II (NOS-I and NOS-II, respectively) and bovine trypsin (trypsin) activity, values of Ki being (1.1 +/- 0.1) x 10(-5) m (at pH 7.5 and 37.0 degrees C), (2.1 +/- 0.1) x 10(-5) m (at pH 7.5 and 37.0 degrees C), and (8.9 +/- 0.4) x 10(-5) m (at pH 6.8 and 21.0 degrees C), respectively. Remarkably, the affinity of N-amidino-2-hydroxypyrrolidine for NOS-I, NOS-II and trypsin is significantly higher than that observed for agmatine and clonidine binding. Furthermore, N-amidino-2-hydroxypyrrolidine and agmatine are more efficient than clonidine in displacing [(3)H]clonidine (= 1.0 x 10(-8) m) from specific binding sites in heart rat membranes, values of IC50 being (1.3 +/- 0.4) x 10(-9) m and (2.2 +/- 0.4) x 10(-8) m, respectively (at pH 7.4 and 37.0 degrees C).
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Affiliation(s)
- Paolo Ascenzi
- Department of Biology, University Roma Tre, Rome, Italy.
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