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Singh E, Gupta A, Singh P, Jain M, Muthukumaran J, Singh RP, Singh AK. Exploring mammalian heme peroxidases: A comprehensive review on the structure and function of myeloperoxidase, lactoperoxidase, eosinophil peroxidase, thyroid peroxidase and peroxidasin. Arch Biochem Biophys 2024; 761:110155. [PMID: 39278306 DOI: 10.1016/j.abb.2024.110155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2024] [Revised: 08/29/2024] [Accepted: 09/12/2024] [Indexed: 09/18/2024]
Abstract
The peroxidase family of enzymes is a ubiquitous cluster of enzymes primarily responsible for the oxidation of organic and inorganic substrates. The mammalian heme peroxidase subfamily is characterized by a covalently linked heme prosthetic group which plays a key role in the oxidation of halides and psuedohalides into their respective hypohalous acid and hypothiocyanous acid under the influence of H2O2 as substrate. The members of the heme peroxidase family include Lactoperoxidase (LPO), Eosinophil peroxidase (EPO), Myeloperoxidase (MPO), Thyroid peroxidase (TPO) and Peroxidasin (PXDN). The biological activity of LPO, MPO and EPO pertains to antibacterial, antifungal and antiviral while TPO is involved in the biosynthesis of the thyroid hormone and PXDN helps maintain the ECM. While these enzymes play several immunomodulatory roles, aberrations in their activity have been implicated in diseases such as myocardial infarction, asthma and Alzheimer's amongst others. The sequence and structural similarities amongst the members of the family are strikingly high while the substrate specificities and subcellular locations vary. Hence, it becomes important to provide a consortium of information regarding the members to study their biochemical, pathological and clinical function.
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Affiliation(s)
- Ekampreet Singh
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India
| | - Ayushi Gupta
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India
| | - Pratyaksha Singh
- School of Biotechnology, Gautam Buddha University, P.C. 201312, Greater Noida, U.P., India
| | - Monika Jain
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India
| | - Jayaraman Muthukumaran
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India
| | - Rashmi Prabha Singh
- Department of Life Science, Sharda School of Basic Sciences and Research, Sharda University, P.C. 201310, Greater Noida, U.P., India.
| | - Amit Kumar Singh
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India.
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Viswanathan V, Ahmad MI, Singh PK, Ahmad N, Sharma P, Sharma S, Singh TP. Structural evidence of the conversion of nitric oxide (NO) to nitrite ion (NO 2-) by lactoperoxidase (LPO): Structure of the complex of LPO with NO 2- at 1.89 Å resolution. J Inorg Biochem 2023; 247:112311. [PMID: 37421730 DOI: 10.1016/j.jinorgbio.2023.112311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 06/26/2023] [Accepted: 06/30/2023] [Indexed: 07/10/2023]
Abstract
Lactoperoxidase (LPO) is a heme containing mammalian enzyme which uses hydrogen peroxide (H2O2) to catalyze the conversion of substrates into oxidized products. LPO is found in body fluids and tissues such as milk, saliva, tears, mucosa and other body secretions. The previous structural studies have shown that LPO converts substrates, thiocyanate (SCN-) and iodide (I-) ions into oxidized products, hypothiocyanite (OSCN-) and hypoiodite (IO-) ions respectively. We report here a new structure of the complex of LPO with an oxidized product, nitrite (NO2-). This product was generated from NO using the two step reaction of LPO by adding hydrogen peroxide (H2O2) in the solution of LPO in 0.1 M phosphate buffer at pH 6.8 as the first step. In the second step, NO gas was added to the above mixture. This was crystallized using 20% (w/v) PEG-3350 and 0.2 M ammonium iodide at pH 6.8. The structure determination showed the presence of NO2- ion in the distal heme cavity of the substrate binding site of LPO. The structure also showed that the propionate group which is linked to pyrrole ring D of the heme moiety was disordered. Similarly, the side chain of Asp108, which is covalently linked to heme moiety, was also split into two components. As a result of these changes, the conformation of the side chain of Arg255 was altered allowing it to form new interactions with the disordered carboxylic group of propionate moiety. These structural changes are indicative of an intermediate state in the catalytic reaction pathway of LPO.
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Affiliation(s)
- V Viswanathan
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Md Irshad Ahmad
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Prashant K Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Nayeem Ahmad
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Pradeep Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Sujata Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Tej P Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India.
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Ghosh B, Roy N, Roy D, Mandal S, Mondal M, Dakua VK, Dutta A, Sen S, Kumar A, Chakraborty R, Roy MN. Exploring Inclusion Complex of an Antithyroid Drug (PTU) with α-Cyclodextrin for Innovative Applications by Physicochemical Approach Optimized by Molecular Docking. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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Singh PK, Ahmad N, Yamini S, Singh RP, Singh AK, Sharma P, Smith ML, Sharma S, Singh TP. Structural evidence of the oxidation of iodide ion into hyper-reactive hypoiodite ion by mammalian heme lactoperoxidase. Protein Sci 2022; 31:384-395. [PMID: 34761444 PMCID: PMC8819834 DOI: 10.1002/pro.4230] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 11/04/2021] [Accepted: 11/05/2021] [Indexed: 02/03/2023]
Abstract
Lactoperoxidase (1.11.1.7, LPO) is a mammalian heme peroxidase found in the extracellular fluids of mammals including plasma, saliva, airway epithelial lining fluids, nasal lining fluid, milk, tears, gastric juices, and intestinal mucosa. To perform its innate immune action against invading microbes, LPO utilizes hydrogen peroxide (H2 O2 ) to convert thiocyanate (SCN- ) and iodide (I- ) ions into the oxidizing compounds hypothiocyanite (OSCN- ) and hypoiodite (IO- ). Previously determined structures of the complexes of LPO with SCN- , OSCN- , and I- show that SCN- and I- occupy appropriate positions in the distal heme cavity as substrates while OSCN- binds in the distal heme cavity as a product inhibitor. We report here the structure of the complex of LPO with IO- as the first structural evidence of the conversion of iodide into hypoiodite by LPO. To obtain this complex, a solution of LPO was first incubated with H2 O2 , then mixed with ammonium iodide solution and the complex crystallized by the addition of PEG-3350, 20% (wt/vol). These crystals were used for X-ray intensity data collection and structure analysis. The structure determination revealed the presence of four hypoiodite ions in the substrate binding channel of LPO. In addition to these, six other hypoiodite ions were observed at different exterior sites. We surmise that the presence of hypoiodite ions in the distal heme cavity blocks the substrate binding site and inhibits catalysis. This was confirmed by activity experiments with the colorimetric substrate, ABTS (2,2'-azino-bis(3-ethylbenzthiazoline-sulfonic acid)), in the presence of hypoiodite and iodide ions.
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Affiliation(s)
- Prashant K. Singh
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Nayeem Ahmad
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Shavait Yamini
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Rashmi P. Singh
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Amit K. Singh
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Pradeep Sharma
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | | | - Sujata Sharma
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
| | - Tej P. Singh
- Department of BiophysicsAll India Institute of Medical SciencesNew DelhiIndia
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Reverse Ordered Sequential Mechanism for Lactoperoxidase with Inhibition by Hydrogen Peroxide. Antioxidants (Basel) 2021; 10:antiox10111646. [PMID: 34829517 PMCID: PMC8614691 DOI: 10.3390/antiox10111646] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 10/02/2021] [Accepted: 10/04/2021] [Indexed: 11/25/2022] Open
Abstract
Lactoperoxidase (LPO, FeIII in its resting state in the absence of substrates)—an enzyme secreted from human mammary, salivary, and other mucosal glands—catalyzes the oxidation of thiocyanate (SCN−) by hydrogen peroxide (H2O2) to produce hypothiocyanite (OSCN−), which functions as an antimicrobial agent. The accepted catalytic mechanism, called the halogen cycle, comprises a two-electron oxidation of LPO by H2O2 to produce oxoiron(IV) radicals, followed by O-atom transfer to SCN−. However, the mechanism does not explain biphasic kinetics and inhibition by H2O2 at low concentration of reducing substrate, conditions that may be biologically relevant. We propose an ordered sequential mechanism in which the order of substrate binding is reversed, first SCN− and then H2O2. The sequence of substrate binding that is described by the halogen cycle mechanism is actually inhibitory.
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Di Rocco G, Battistuzzi G, Borsari M, Bortolotti CA, Ranieri A, Sola M. The enthalpic and entropic terms of the reduction potential of metalloproteins: Determinants and interplay. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214071] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Singh PK, Sharma P, Bhushan A, Kaur P, Sharma S, Singh TP. Structure of a ternary complex of lactoperoxidase with iodide and hydrogen peroxide at 1.77 Å resolution. J Inorg Biochem 2021; 220:111461. [PMID: 33882424 DOI: 10.1016/j.jinorgbio.2021.111461] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 04/05/2021] [Accepted: 04/05/2021] [Indexed: 11/16/2022]
Abstract
Lactoperoxidase (LPO) is a mammalian heme peroxidase which catalyzes the conversion of thiocyanate (SCN¯) and iodide (I-) by hydrogen peroxide (H2O2) into antimicrobial hypothiocyanite (OSCN¯) and hypoiodite (IO-). The prosthetic heme group is covalently attached to LPO through two ester linkages involving conserved glutamate and aspartate residues. On the proximal side, His351 is coordinated to heme iron while His 109 is located in the substrate binding site on the distal heme side. We report here the first structure of the ternary complex of LPO with iodide (I-) and H2O2 at 1.77 Å resolution. LPO was crystallized with ammonium iodide and the crystals were soaked in the reservoir solution containing H2O2. Structure determination showed the presence of an iodide ion and a H2O2 molecule in the substrate binding site. The iodide ion occupied the position which is stabilized by the interactions with heme moiety, His109, Arg255 and Glu258 while H2O2 was held between the heme iron and His109. The presence of I- in the distal heme cavity seems to screen the positive charge of Arg255 thus suppressing the proton transfer from H2O2 to His109. This prevents compound I formation and allows trapping of a stable enzyme-substrate (LPO-I--H2O2) ternary complex. This stable geometrical arrangement of H2O2 in the distal heme cavity of LPO is similar to that of H2O2 in the structure of the transient intermediate of the palm tree heme peroxidase. The biochemical studies showed that the catalytic activity of LPO decreased when the samples of LPO were preincubated with ammonium iodide.
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Affiliation(s)
- Prashant K Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Pradeep Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Asha Bhushan
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Punit Kaur
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Sujata Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - Tej P Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India.
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Singh PK, Pandey S, Rani C, Ahmad N, Viswanathan V, Sharma P, Kaur P, Sharma S, Singh TP. Potassium-induced partial inhibition of lactoperoxidase: structure of the complex of lactoperoxidase with potassium ion at 2.20 Å resolution. J Biol Inorg Chem 2021; 26:149-159. [PMID: 33427997 DOI: 10.1007/s00775-020-01844-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 12/07/2020] [Indexed: 11/30/2022]
Abstract
Lactoperoxidase, a heme-containing glycoprotein, catalyzes the oxidation of thiocyanate by hydrogen peroxide into hypothiocyanite which acts as an antibacterial agent. The prosthetic heme moiety is attached to the protein through two ester linkages via Glu258 and Asp108. In lactoperoxidase, the substrate-binding site is formed on the distal heme side. To study the effect of physiologically important potassium ion on the structure and function of lactoperoxidase, the fresh protein samples were isolated from yak (Bos grunniens) colostrum and purified to homogeneity. The biochemical studies with potassium fluoride showed a significant reduction in the catalytic activity. Lactoperoxidase was crystallized using 200 mM ammonium nitrate and 20% PEG-3350 at pH 6.0. The crystals of LPO were soaked in the solution of potassium fluoride and used for the X-ray intensity data collection. Structure determination at 2.20 Å resolution revealed the presence of a potassium ion in the distal heme cavity. Structure determination further revealed that the propionic chain attached to pyrrole ring C of the heme moiety, was disordered into two components each having an occupancy of 0.5. One component occupied a position similar to the normally observed position of propionic chain while the second component was found in the distal heme cavity. The potassium ion in the distal heme cavity formed five coordinate bonds with two oxygen atoms of propionic moiety, Nε2 atom of His109 and two oxygen atoms of water molecules. The presence of potassium ion in the distal heme cavity hampered the catalytic activity of lactoperoxidase.
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Affiliation(s)
- Prashant K Singh
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India
| | - Sadanand Pandey
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India
| | - Chitra Rani
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India
| | - Nayeem Ahmad
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India
| | - V Viswanathan
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India
| | - Pradeep Sharma
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India
| | - Punit Kaur
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India
| | - Sujata Sharma
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India
| | - Tej P Singh
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India.
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The inhibition of lactoperoxidase catalytic activity through mesna (2-mercaptoethane sodium sulfonate). J Inorg Biochem 2019; 203:110911. [PMID: 31734539 DOI: 10.1016/j.jinorgbio.2019.110911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 10/10/2019] [Accepted: 11/07/2019] [Indexed: 11/24/2022]
Abstract
Here, we show that mesna (sodium-2-mercaptoethane sulfonate), primarily used to prevent nephrotoxicity and urinary tract toxicity caused by chemotherapeutic agents such as cyclophosphamide and ifosfamide, modulates the catalytic activity of lactoperoxidase (LPO) by binding tightly to the enzyme, functioning either as a one electron substrate for LPO Compounds I and II, destabilizing Compound III. Lactoperoxidase is a hemoprotein that utilizes hydrogen peroxide (H2O2) and thiocyanate (SCN-) to produce hypothiocyanous acid (HOSCN), an antimicrobial agent also thought to be associated with carcinogenesis. Our results revealed that mesna binds stably to LPO within the SCN- binding site, dependent of the heme iron moiety, and its combination with LPO-Fe(III) is associated with a disturbance in the water molecule network in the heme cavity. At low concentrations, mesna accelerated the formation and decay of LPO compound II via its ability to serve as a one electron substrate for LPO compounds I and II. At higher concentrations, mesna also accelerated the formation of Compound II but it decays to LPO-Fe(III) directly or through the formation of an intermediate, Compound I*, that displays characteristic spectrum similar to that of LPO Compound I. Mesna inhibits LPO's halogenation activity (IC50 value of 9.08 μM) by switching the reaction from a 2e- to a 1e- pathway, allowing the enzyme to function with significant peroxidase activity (conversion of H2O2 to H2O without generation of HOSCN). Collectively, mesna interaction with LPO may serve as a potential mechanism for modulating its steady-state catalysis, impacting the regulation of local inflammatory and infectious events.
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Design, Synthesis, Molecular Modeling, and Biological Evaluation of Novel Thiouracil Derivatives as Potential Antithyroid Agents. Molecules 2018; 23:molecules23112913. [PMID: 30413058 PMCID: PMC6278332 DOI: 10.3390/molecules23112913] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 10/29/2018] [Accepted: 10/30/2018] [Indexed: 12/13/2022] Open
Abstract
Hyperthyroidism is the result of uncontrolled overproduction of the thyroid hormones. One of the mostly used antithyroid agents is 6-n-propyl-2-thiouracil (PTU). The previously solved X-ray crystal structure of the PTU bound to mammalian lactoperoxidase (LPO) reveals that the LPO-PTU binding site is basically a hydrophobic channel. There are two hydrophobic side chains directed towards the oxygen atom in the C-4 position of the thiouracil ring. In the current study, the structural activity relationship (SAR) was performed on the thiouracil nucleus of PTU to target these hydrophobic side chains and gain more favorable interactions and, in return, more antithyroid activity. Most of the designed compounds show superiority over PTU in reducing the mean serum T4 levels of hyperthyroid rats by 3% to 60%. In addition, the effect of these compounds on the levels of serum T3 was found to be comparable to the effect of PTU treatment. The designed compounds in this study showed a promising activity profile in reducing levels of thyroid hormones and follow up experiments will be needed to confirm the use of the designed compounds as new potential antithyroid agents.
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B S GK, Mohan Reddy P, Kottekad S. Comparative Site-Specific N-Glycosylation Analysis of Lactoperoxidase from Buffalo and Goat Milk Using RP-UHPLC-MS/MS Reveals a Distinct Glycan Pattern. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:11492-11499. [PMID: 30296068 DOI: 10.1021/acs.jafc.8b03243] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The N-glycan pattern of lactoperoxidase (LPO) from buffalo and goat milk was analyzed with the corresponding site of attachment. The enzyme was purified from whey on cation exchange chromatography, proteolyzed using chymotrypsin, and the resulting (glyco)peptides were directly analyzed on reverse phase ultrahigh performance liquid chromatography coupled to ESI-Q-TOF MS in tandem mode. N-Glycans such as high mannose, complex, and hybrid types were identified in buffalo and goat LPO. Among sialylated complex and hybrid types, the terminal Neu5Ac linked to either LacNAc/LacdiNAc found exclusively in buffalo, whereas Neu5Gc linked to LacdiNAc was predominant in goat LPO. N-Glycans at Asn6 and Asn349 in buffalo LPO were completely core fucosylated, while these sites in goat LPO showed differential fucosylation. Differential occupancy was observed at Asn112 with or without nonfucosylated complex and hybrid types, whereas mainly high mannose glycans were found in Asn222 in both of the LPOs. The presence of glycan isomers in buffalo and goat LPO was also observed. Despite the presence of distinct complex and hybrid glycans, the common glycosylation features in buffalo and goat LPO were identified and are comparable with those of bovine LPO. This finding could be useful in exploring the beneficial role of these glycans as functional ingredients for food products.
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Affiliation(s)
- Gnanesh Kumar B S
- Department of Biochemistry , CSIR-Central Food Technological Research Institute (CFTRI) , Mysuru , Karnataka 570020 , India
| | - Prasad Mohan Reddy
- St. Joseph's College (Autonomous), Shanthinagar , Bengaluru , Karnataka 560027 , India
| | - Sanjay Kottekad
- Department of Biochemistry , CSIR-Central Food Technological Research Institute (CFTRI) , Mysuru , Karnataka 570020 , India
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Sheikh IA, Jiffri EH, Ashraf GM, Kamal MA. Structural insights into the camel milk lactoperoxidase: Homology modeling and molecular dynamics simulation studies. J Mol Graph Model 2018; 86:43-51. [PMID: 30326373 DOI: 10.1016/j.jmgm.2018.10.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 09/13/2018] [Accepted: 10/09/2018] [Indexed: 12/16/2022]
Abstract
Lactoperoxodase (LPO) is a heme peroxidase enzyme present in mammalian milk. It is an antimicrobial protein with wide range of industrial applications. Although the three dimensional structure of LPO from various mammalian species has been reported, but its structure from camel source is still unknown. So far, the crystallization attempts have not been successful in determining camel LPO (cLPO) structure. Herein, we developed the three dimensional structure of cLPO by homology modeling approach using prime module available in Schrodinger suite. The developed model in complex with ligand hypothiocyanate (OSCN-) was further validated by Ramachandran plot followed by molecular dynamics (MD) simulation studies using Desmond module of Schrodinger. cLPO model exhibited overall structural similarity with template crystal structure, however, it displayed different interaction pattern of amino acid residues with ligand OSCN- in comparison to template crystal structure. Moreover, the ligand binding site environment in cLPO is more polar, less hydrophobic, and harbours more number of charged residues than template crystal structure. The substrate binding pocket environment of cLPO shows a considerable difference from template crystal structure. This subsequently resulted in dissimilar behaviour of ligand during the course of MD simulation studies.
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Affiliation(s)
- Ishfaq A Sheikh
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.
| | - Essam H Jiffri
- Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Ghulam Md Ashraf
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohammad A Kamal
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
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Calva-Candelaria N, Meléndez-Camargo ME, Montellano-Rosales H, Estrada-Pérez AR, Rosales-Hernández MC, Fragoso-Vázquez MJ, Martínez-Archundia M, Correa-Basurto J, Márquez-Flores YK. Oenothera rosea L´Hér. ex Ait attenuates acute colonic inflammation in TNBS-induced colitis model in rats: in vivo and in silico myeloperoxidase role. Biomed Pharmacother 2018; 108:852-864. [PMID: 30372897 DOI: 10.1016/j.biopha.2018.09.081] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 09/10/2018] [Accepted: 09/12/2018] [Indexed: 01/23/2023] Open
Abstract
Oenothera rosea L´Hér. ex Ait is a species traditionally used in the treatment of inflammation, headache, stomach pain, infections, among others. The aim of this study was evaluating the acute anti-inflammatory activity of the aqueous extract of O. rosea by 2,4,6-trinitrobenzene sulfonic acid (TNBS)-induced colitis. Rats were randomized into six groups: (I) Sham; (II) EtOH; (III) TNBS; and (IV-VI) 250, 500 and 750 mg/Kg, respectively. The colonic injury was induced (groups III-VI) by intrarectal instillation of 0.25 mL of TNBS (10 mg) in 50% ethanol. Groups I and II received an enema (0.25 mL) of physiological saline solution or 50% ethanol, respectively. Treatments were administered by oral gavage 48, 24 and 1 h prior, and 24 h after the induction. The inflammatory response was assessed considering the macroscopic and microscopic damage, the serum nitric oxide (NO), the colonic IL-1β levels, and the myeloperoxidase (MPO) activity. Moreover, we performed an LC-MS-based metabolite profiling, and a docking on the MPO. Doses of 500 and 750 mg/Kg showed a protective effect in the TNBS-induced colonic damage. This activity was related to the downregulation of evaluated parameters. Also, considering previous reports, 29 metabolites of 91 detected were selected for the docking, of which Isolimonic acid (29) and Kaempferol 3-(2'',4''-diacetylrhamnoside) (10) showed the highest affinity to MPO. The aqueous extract of O. rosea protected the TNBS-induced colonic damage in rats, an effect that could be associated with the presence of polyphenolic compounds, alkaloids, and terpenes; as well as their ability to down-regulate MPO activity.
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Affiliation(s)
- Natalia Calva-Candelaria
- Departamento de Farmacia, Escuela Nacional de Ciencias Biológicas, Campus Zacatenco, Instituto Politécnico Nacional, Av. Wilfrido Massieu s/n Col. Zacatenco, C.P. 07738, Ciudad de México, Mexico
| | - María Estela Meléndez-Camargo
- Departamento de Farmacia, Escuela Nacional de Ciencias Biológicas, Campus Zacatenco, Instituto Politécnico Nacional, Av. Wilfrido Massieu s/n Col. Zacatenco, C.P. 07738, Ciudad de México, Mexico
| | - Hortensia Montellano-Rosales
- Departamento de Morfología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Col. Santo Tomás, C.P. 11340, Ciudad de México, Mexico
| | - Alan R Estrada-Pérez
- Laboratorio de Desarrollo de Nuevos Fármacos y Productos Biotecnológicos, Laboratorio de Biofísica y Catálisis, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón s/n, Col. Santo Tomas, C.P. 11340, Ciudad de México, Mexico
| | - Martha C Rosales-Hernández
- Laboratorio de Desarrollo de Nuevos Fármacos y Productos Biotecnológicos, Laboratorio de Biofísica y Catálisis, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón s/n, Col. Santo Tomas, C.P. 11340, Ciudad de México, Mexico
| | - M Jonathan Fragoso-Vázquez
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Col. Santo Tomás, C.P. 11340, Ciudad de México, Mexico
| | - Marlet Martínez-Archundia
- Laboratorio de Desarrollo de Nuevos Fármacos y Productos Biotecnológicos, Laboratorio de Biofísica y Catálisis, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón s/n, Col. Santo Tomas, C.P. 11340, Ciudad de México, Mexico
| | - José Correa-Basurto
- Laboratorio de Desarrollo de Nuevos Fármacos y Productos Biotecnológicos, Laboratorio de Biofísica y Catálisis, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón s/n, Col. Santo Tomas, C.P. 11340, Ciudad de México, Mexico
| | - Yazmín K Márquez-Flores
- Departamento de Farmacia, Escuela Nacional de Ciencias Biológicas, Campus Zacatenco, Instituto Politécnico Nacional, Av. Wilfrido Massieu s/n Col. Zacatenco, C.P. 07738, Ciudad de México, Mexico; Universidad Tecnológica de México, UNITEC MÉXICO, Campus Marina, Av. Marina Nacional 162 Col. Anáhuac Sección I, C.P. 11320, Miguel Hidalgo, Ciudad de México, Mexico.
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15
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Lactoperoxidase immobilization on silver nanoparticles enhances its antimicrobial activity. J DAIRY RES 2018; 85:460-464. [DOI: 10.1017/s0022029918000730] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Lactoperoxidase (LPO) is an antimicrobial protein present in milk that plays an important role in natural defence mechanisms during neonatal and adult life. The antimicrobial activity of LPO has been commercially adapted for increasing the shelf life of dairy products. Immobilization of LPO on silver nanoparticles (AgNPs) is a promising way to enhance the antimicrobial activity of LPO. In the current study, LPO was immobilized on AgNPs to form LPO/AgNP conjugate. The immobilized LPO/AgNP conjugate was characterized by various biophysical techniques. The enhanced antibacterial activity of the conjugate was tested against E. coli in culture at 2 h intervals for 10 h. The results showed successful synthesis of spherical AgNPs. LPO was immobilized on AgNPs with agglomerate sizes averaging approximately 50 nm. The immobilized conjugate exhibited stronger antibacterial activity against E. coli in comparison to free LPO. This study may help in increasing the efficiency of lactoperoxidase system and will assist in identifying novel avenues to enhance the stability and antimicrobial function of LPO system in dairy and other industries.
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Sheikh IA, Jiffri EH, Ashraf GM, Kamal MA, Beg MA. Structural studies on inhibitory mechanisms of antibiotic, corticosteroid and catecholamine molecules on lactoperoxidase. Life Sci 2018; 207:412-419. [PMID: 29953881 DOI: 10.1016/j.lfs.2018.06.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 06/13/2018] [Accepted: 06/25/2018] [Indexed: 12/17/2022]
Abstract
AIM Lactoperoxidase (LPO) is an essential protein with broad spectrum antimicrobial activity present in mammalian milk. It imparts immunity to infants against wide range of pathogenic infections. Several in vitro studies have shown inhibition of LPO activity by pharmaceutical compounds including commonly used antibiotics such as ampicillin and gentamicin, and molecules like prednisolone, norepinephrine, etc. Prescription of such drugs to lactating mothers might have adverse health effects on infants. The aim of our study was the elucidation of the structural aspects of the inhibitory mechanism of ampicillin, gentamicin, amoxicillin, prednisolone and norepinephrine on LPO. MATERIAL AND METHODS Three dimensional structure of camel LPO (cLPO) was developed using homology modeling and used for in silico experimental studies. The Schrödinger induced fit docking along with binding affinity estimation experiments were performed. The cLPO and Ligands were prepared using Protein Preparation Wizard and Ligprep modules available in Schrodinger suite. For estimating Binding affinity Prime Molecular Mechanics with Generalized Born and Surface Area (MMGB-SA) module was used. KEY RESULTS The five drug ligands formed three to five hydrogen bonding interactions with cLPO. Amino acids Arg-231, Asp-232, Ser-370, Arg-371 and Glu-374 of cLPO were crucial for these interactions. The binding affinity values for gentamicin were highest and for norepinephrine were the lowest. SIGNIFICANCE This study concludes that the five drug molecules show potential ability to inhibit the LPO activity. Further, a very high sequence similarity of cLPO with human LPO imparts high significance to these conclusions in relation to human health especially in new born infants.
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Affiliation(s)
- Ishfaq A Sheikh
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.
| | - Essam H Jiffri
- Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Ghulam Md Ashraf
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohammad A Kamal
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohd A Beg
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
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17
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Structural basis of activation of mammalian heme peroxidases. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2018; 133:49-55. [DOI: 10.1016/j.pbiomolbio.2017.11.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 11/14/2017] [Accepted: 11/15/2017] [Indexed: 12/27/2022]
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18
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Sirohi HV, Singh PK, Iqbal N, Sharma P, Singh AK, Kaur P, Sharma S, Singh TP. Design of anti-thyroid drugs: Binding studies and structure determination of the complex of lactoperoxidase with 2-mercaptoimidazole at 2.30 Å resolution. Proteins 2017; 85:1882-1890. [PMID: 28653416 DOI: 10.1002/prot.25342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 06/08/2017] [Accepted: 06/21/2017] [Indexed: 11/08/2022]
Abstract
Lactoperoxidase (LPO) belongs to mammalian heme peroxidase superfamily, which also includes myeloperoxidase (MPO), eosinophil peroxidase (EPO), and thyroid peroxidase (TPO). LPO catalyzes the oxidation of a number of substrates including thiocyanate while TPO catalyzes the biosynthesis of thyroid hormones. LPO is also been shown to catalyze the biosynthesis of thyroid hormones indicating similar functional and structural properties. The binding studies showed that 2-mercaptoimidazole (MZY) bound to LPO with a dissociation constant of 0.63 µM. The inhibition studies showed that the value of IC50 was 17 µM. The crystal structure of the complex of LPO with MZY showed that MZY bound to LPO in the substrate-binding site on the distal heme side. MZY was oriented in the substrate-binding site in such a way that the sulfur atom is at a distance of 2.58 Å from the heme iron. Previously, a similar compound, 3-amino-1,2,4-triazole (amitrole) was also shown to bind to LPO in the substrate-binding site on the distal heme side. The amino nitrogen atom of amitrole occupied the same position as that of sulfur atom in the present structure indicating a similar mode of binding. Recently, the structure of the complex of LPO with a potent antithyroid drug, 1-methylimidazole-2-thiol (methimazole, MMZ) was also determined. It showed that MMZ bound to LPO in the substrate-binding site on the distal heme side with 2 orientations. The position of methyl group was same in the 2 orientations while the positions of sulfur atom differed indicating a higher preference for a methyl group.
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Affiliation(s)
- Harsh V Sirohi
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi
| | - Prashant K Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi
| | - Naseer Iqbal
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi
| | - Pradeep Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi
| | - Amit K Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi
| | - Punit Kaur
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi
| | - Sujata Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi
| | - Tej P Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi
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19
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Singh PK, Sirohi HV, Iqbal N, Tiwari P, Kaur P, Sharma S, Singh TP. Structure of bovine lactoperoxidase with a partially linked heme moiety at 1.98Å resolution. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2017; 1865:329-335. [DOI: 10.1016/j.bbapap.2016.12.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 12/05/2016] [Accepted: 12/10/2016] [Indexed: 11/26/2022]
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20
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Singh RP, Singh A, Sirohi HV, Singh AK, Kaur P, Sharma S, Singh TP. Dual binding mode of antithyroid drug methimazole to mammalian heme peroxidases - structural determination of the lactoperoxidase-methimazole complex at 1.97 Å resolution. FEBS Open Bio 2016; 6:640-50. [PMID: 27398304 PMCID: PMC4932444 DOI: 10.1002/2211-5463.12051] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 02/27/2016] [Accepted: 02/29/2016] [Indexed: 11/09/2022] Open
Abstract
Lactoperoxidase (LPO, EC 1.11.1.7) is a member of the mammalian heme peroxidase family which also includes thyroid peroxidase (TPO). These two enzymes have a sequence homology of 76%. The structure of LPO is known but not that of TPO. In order to determine the mode of binding of antithyroid drugs to thyroid peroxidase, we have determined the crystal structure of LPO complexed with an antithyroid drug, methimazole (MMZ) at 1.97 Å resolution. LPO was isolated from caprine colostrum, purified to homogeneity and crystallized with 20% poly(ethylene glycol)‐3350. Crystals of LPO were soaked in a reservoir solution containing MMZ. The structure determination showed the presence of two crystallographically independent molecules in the asymmetric unit. Both molecules contained one molecule of MMZ, but with different orientations. MMZ was held tightly between the heme moiety on one side and the hydrophobic parts of the side chains of Arg255, Glu258, and Leu262 on the opposite side. The back of the cleft contained the side chains of Gln105 and His109 which also interacted with MMZ. In both orientations, MMZ had identical buried areas and formed a similar number of interactions. It appears that the molecules of MMZ can enter the substrate‐binding channel of LPO in two opposite orientations. But once they reach the distal heme pocket, their orientations are frozen due to equally tight packing of MMZ in both orientations. This is a novel example of an inhibitor binding to an enzyme with two orientations at the same site with nearly equal occupancies.
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Affiliation(s)
- Rashmi Prabha Singh
- Department of Biophysics All India Institute of Medical Sciences New Delhi India
| | - Avinash Singh
- Department of Biophysics All India Institute of Medical Sciences New Delhi India
| | - Harsh Vardhan Sirohi
- Department of Biophysics All India Institute of Medical Sciences New Delhi India
| | - Amit Kumar Singh
- Department of Biophysics All India Institute of Medical Sciences New Delhi India
| | - Punit Kaur
- Department of Biophysics All India Institute of Medical Sciences New Delhi India
| | - Sujata Sharma
- Department of Biophysics All India Institute of Medical Sciences New Delhi India
| | - Tej P Singh
- Department of Biophysics All India Institute of Medical Sciences New Delhi India
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21
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Flemmig J, Gau J, Schlorke D, Arnhold J. Lactoperoxidase as a potential drug target. Expert Opin Ther Targets 2015; 20:447-61. [DOI: 10.1517/14728222.2016.1112378] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jörg Flemmig
- Institute for Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Härtelstraße 16 – 18, 04107 Leipzig, Germany
- Translational Centre for Regenerative Medicine (TRM) Leipzig, University of Leipzig, Leipzig, Germany
| | - Jana Gau
- Institute for Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Härtelstraße 16 – 18, 04107 Leipzig, Germany
| | - Denise Schlorke
- Institute for Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Härtelstraße 16 – 18, 04107 Leipzig, Germany
- Translational Centre for Regenerative Medicine (TRM) Leipzig, University of Leipzig, Leipzig, Germany
| | - Jürgen Arnhold
- Institute for Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Härtelstraße 16 – 18, 04107 Leipzig, Germany
- Translational Centre for Regenerative Medicine (TRM) Leipzig, University of Leipzig, Leipzig, Germany
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22
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Pang AH, Garneau-Tsodikova S, Tsodikov OV. Crystal structure of halogenase PltA from the pyoluteorin biosynthetic pathway. J Struct Biol 2015; 192:349-357. [PMID: 26416533 DOI: 10.1016/j.jsb.2015.09.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 09/24/2015] [Accepted: 09/25/2015] [Indexed: 10/23/2022]
Abstract
Pyoluteorin is an antifungal agent composed of a 4,5-dichlorinated pyrrole group linked to a resorcinol moiety. The pyoluteorin biosynthetic gene cluster in Pseudomonas fluorescens Pf-5 encodes the halogenase PltA, which has been previously demonstrated to perform both chlorinations in vitro. PltA selectively accepts as a substrate a pyrrole moiety covalently tethered to a nonribosomal peptide thiolation domain PltL (pyrrolyl-S-PltL) for FAD-dependent di-chlorination, yielding 4,5-dichloropyrrolyl-S-PltL. We report a 2.75 Å-resolution crystal structure of PltA in complex with FAD and chloride. PltA is a dimeric enzyme, containing a flavin-binding fold conserved in flavin-dependent halogenases and monooxygenases, and an additional unique helical region at the C-terminus. This C-terminal region blocks a putative substrate-binding cleft, suggesting that a conformational change involving repositioning of this region is necessary to allow binding of the pyrrolyl-S-PltL substrate for its dichlorination by PltA.
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Affiliation(s)
- Allan H Pang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536-0596, USA
| | - Sylvie Garneau-Tsodikova
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536-0596, USA
| | - Oleg V Tsodikov
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536-0596, USA.
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23
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Singh RP, Singh A, Kushwaha GS, Singh AK, Kaur P, Sharma S, Singh TP. Mode of binding of the antithyroid drug propylthiouracil to mammalian haem peroxidases. ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS 2015; 71:304-10. [PMID: 25760705 DOI: 10.1107/s2053230x15001806] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 01/27/2015] [Indexed: 11/10/2022]
Abstract
The mammalian haem peroxidase superfamily consists of myeloperoxidase (MPO), lactoperoxidase (LPO), eosinophil peroxidase (EPO) and thyroid peroxidase (TPO). These enzymes catalyze a number of oxidative reactions of inorganic substrates such as Cl(-), Br(-), I(-) and SCN(-) as well as of various organic aromatic compounds. To date, only structures of MPO and LPO are known. The substrate-binding sites in these enzymes are located on the distal haem side. Propylthiouracil (PTU) is a potent antithyroid drug that acts by inhibiting the function of TPO. It has also been shown to inhibit the action of LPO. However, its mode of binding to mammalian haem peroxidases is not yet known. In order to determine the mode of its binding to peroxidases, the structure of the complex of LPO with PTU has been determined. It showed that PTU binds to LPO in the substrate-binding site on the distal haem side. The IC50 values for the inhibition of LPO and TPO by PTU are 47 and 30 µM, respectively. A comparision of the residues surrounding the substrate-binding site on the distal haem side in LPO with those in TPO showed that all of the residues were identical except for Ala114 (LPO numbering scheme), which is replaced by Thr205 (TPO numbering scheme) in TPO. A threonine residue in place of alanine in the substrate-binding site may affect the affinity of PTU for peroxidases.
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Affiliation(s)
- R P Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - A Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - G S Kushwaha
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - A K Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - P Kaur
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - S Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
| | - T P Singh
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
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24
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Abu-Soud HM, Maitra D, Shaeib F, Khan SN, Byun J, Abdulhamid I, Yang Z, Saed GM, Diamond MP, Andreana PR, Pennathur S. Disruption of heme-peptide covalent cross-linking in mammalian peroxidases by hypochlorous acid. J Inorg Biochem 2014; 140:245-54. [PMID: 25193127 PMCID: PMC4449957 DOI: 10.1016/j.jinorgbio.2014.06.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 06/25/2014] [Accepted: 06/27/2014] [Indexed: 12/14/2022]
Abstract
Myeloperoxidase (MPO), lactoperoxidase (LPO) and eosinophil peroxidase (EPO) play a central role in oxidative damage in inflammatory disorders by utilizing hydrogen peroxide and halides/pseudo halides to generate the corresponding hypohalous acid. The catalytic sites of these enzymes contain a covalently modified heme group, which is tethered to the polypeptide chain at two ester linkages via the methyl group (MPO, EPO and LPO) and one sulfonium bond via the vinyl group (MPO only). Covalent cross-linking of the catalytic site heme to the polypeptide chain in peroxidases is thought to play a protective role, since it renders the heme moiety less susceptible to the oxidants generated by these enzymes. Mass-spectrometric analysis revealed the following possible pathways by which hypochlorous acid (HOCl) disrupts the heme-protein cross-linking: (1) the methyl-ester bond is cleaved to form an alcohol; (2) the alcohol group undergoes an oxygen elimination reaction via the formation of an aldehyde intermediate or undergoes a demethylation reaction to lose the terminal CH2 group; and (3) the oxidative cleavage of the vinyl-sulfonium linkage. Once the heme moiety is released it undergoes cleavage at the carbon-methyne bridge either along the δ-β or a α-γ axis to form different pyrrole derivatives. These results indicate that covalent cross-linking is not enough to protect the enzymes from HOCl mediated heme destruction and free iron release. Thus, the interactions of mammalian peroxidases with HOCl modulates their activity and sets a stage for initiation of the Fenton reaction, further perpetuating oxidative damage at sites of inflammation.
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Affiliation(s)
- Husam M Abu-Soud
- Department of Obstetrics and Gynecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, MI 48201, USA; Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine, Detroit, MI 48201, USA.
| | - Dhiman Maitra
- Department of Obstetrics and Gynecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Faten Shaeib
- Department of Obstetrics and Gynecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Sana N Khan
- Department of Obstetrics and Gynecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Jaeman Byun
- Division of Nephrology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Ibrahim Abdulhamid
- Department of Pediatrics, Children's Hospital of Michigan, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Zhe Yang
- Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Ghassan M Saed
- Department of Obstetrics and Gynecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Michael P Diamond
- Department of Obstetrics and Gynecology, Georgia Regents University, Augusta, GA 30912, USA
| | - Peter R Andreana
- The University of Toledo, Department of Chemistry and School of Green Chemistry and Engineering, 2801 W. Bancroft St., Toledo, OH 43606, USA
| | - Subramaniam Pennathur
- Division of Nephrology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
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25
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Bafort F, Parisi O, Perraudin JP, Jijakli MH. Mode of action of lactoperoxidase as related to its antimicrobial activity: a review. Enzyme Res 2014; 2014:517164. [PMID: 25309750 PMCID: PMC4182067 DOI: 10.1155/2014/517164] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 08/19/2014] [Accepted: 08/19/2014] [Indexed: 01/11/2023] Open
Abstract
Lactoperoxidase is a member of the family of the mammalian heme peroxidases which have a broad spectrum of activity. Their best known effect is their antimicrobial activity that arouses much interest in in vivo and in vitro applications. In this context, the proper use of lactoperoxidase needs a good understanding of its mode of action, of the factors that favor or limit its activity, and of the features and properties of the active molecules. The first part of this review describes briefly the classification of mammalian peroxidases and their role in the human immune system and in host cell damage. The second part summarizes present knowledge on the mode of action of lactoperoxidase, with special focus on the characteristics to be taken into account for in vitro or in vivo antimicrobial use. The last part looks upon the characteristics of the active molecule produced by lactoperoxidase in the presence of thiocyanate and/or iodide with implication(s) on its antimicrobial activity.
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Affiliation(s)
- F. Bafort
- Plant Pathology Laboratory, Liége University, Gembloux Agro-Bio Tech, Passage des Déportés 2, 5030 Gembloux, Belgium
| | - O. Parisi
- Plant Pathology Laboratory, Liége University, Gembloux Agro-Bio Tech, Passage des Déportés 2, 5030 Gembloux, Belgium
| | - J.-P. Perraudin
- Taradon Laboratory, Avenue Léon Champagne 2, 1480 Tubize, Belgium
| | - M. H. Jijakli
- Plant Pathology Laboratory, Liége University, Gembloux Agro-Bio Tech, Passage des Déportés 2, 5030 Gembloux, Belgium
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Pirota V, Gennarini F, Dondi D, Monzani E, Casella L, Dell'Acqua S. Dinuclear heme and non-heme metal complexes as bioinspired catalysts for oxidation reactions. NEW J CHEM 2014. [DOI: 10.1039/c3nj01279d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Sharma S, Singh AK, Kaushik S, Sinha M, Singh RP, Sharma P, Sirohi H, Kaur P, Singh TP. Lactoperoxidase: structural insights into the function,ligand binding and inhibition. INTERNATIONAL JOURNAL OF BIOCHEMISTRY AND MOLECULAR BIOLOGY 2013; 4:108-128. [PMID: 24049667 PMCID: PMC3776144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 08/21/2013] [Indexed: 06/02/2023]
Abstract
Lactoperoxidase (LPO) is a member of a large group of mammalian heme peroxidases that include myeloperoxidase (MPO), eosinophil peroxidase (EPO) and thyroid peroxidase (TPO). The LPO is found in exocrine secretions including milk. It is responsible for the inactivation of a wide range of micro-organisms and hence, is an important component of defense mechanism in the body. With the help of hydrogen peroxide, it catalyzes the oxidation of halides, pseudohalides and organic aromatic molecules. Historically, LPO was isolated in 1943, nearly seventy years ago but its three-dimensional crystal structure has been elucidated only recently. This review provides various details of this protein from its discovery to understanding its structure, function and applications. In order to highlight species dependent variations in the structure and function of LPO, a detailed comparison of sequence, structure and function of LPO from various species have been made. The structural basis of ligand binding and distinctions in the modes of binding of substrates and inhibitors have been analyzed extensively.
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Affiliation(s)
- Sujata Sharma
- Department of Biophysics, All India Institute of Medical Sciences New Delhi - 110029, India
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28
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Bovine Carbonyl Lactoperoxidase Structure at 2.0Å Resolution and Infrared Spectra as a Function of pH. Protein J 2012; 31:598-608. [DOI: 10.1007/s10930-012-9436-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Sicking W, Somnitz H, Schmuck C. DFT Calculations Suggest a New Type of Self-Protection and Self-Inhibition Mechanism in the Mammalian Heme Enzyme Myeloperoxidase: Nucleophilic Addition of a Functional Water rather than One-Electron Reduction. Chemistry 2012; 18:10937-48. [DOI: 10.1002/chem.201103477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Revised: 05/14/2012] [Indexed: 11/09/2022]
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Kim BW, Esworthy RS, Hahn MA, Pfeifer GP, Chu FF. Expression of lactoperoxidase in differentiated mouse colon epithelial cells. Free Radic Biol Med 2012; 52:1569-76. [PMID: 22343415 PMCID: PMC3341587 DOI: 10.1016/j.freeradbiomed.2012.02.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 01/30/2012] [Accepted: 02/06/2012] [Indexed: 12/19/2022]
Abstract
Lactoperoxidase (LPO) is known to be present in secreted fluids, such as milk and saliva. Functionally, LPO teams up with dual oxidases (DUOXs) to generate bactericidal hypothiocyanite in the presence of thiocyanate. DUOX2 is expressed in intestinal epithelium, but there is little information on LPO expression in this tissue. To fill the gap of knowledge, we have analyzed Lpo gene expression and its regulation in mouse intestine. In wild-type (WT) C57BL/6 (B6) mouse intestine, an appreciable level of mouse Lpo gene expression was detected in the colon, but not the ileum. However, in B6 mice deficient in glutathione peroxidase (GPx)-1 and -2, GPx1/2-double-knockout (DKO), which had intestinal pathology, the colon Lpo mRNA levels increased 5- to 12-fold depending on mouse age. The Lpo mRNA levels in WT and DKO 129S1/SvlmJ (129) colon were even higher, 9- and 5-fold, than in B6 DKO colon. Higher levels of Lpo protein and enzymatic activity were also detected in the 129 mouse colon compared to B6 colon. Lpo protein was expressed in the differentiated colon epithelial cells, away from the crypt base, as shown by immunohistochemistry. Similar to human LPO mRNA, mouse Lpo mRNA had multiple spliced forms, although only the full-length variant 1 was translated. Higher methylation was found in the 129 than in the B6 strain, in DKO than in control colon, and in older than in juvenile mice. However, methylation of the Lpo intragenic CpG island was not directly induced by inflammation, because dextran sulfate sodium-induced colitis did not increase DNA methylation in B6 DKO colon. Also, Lpo DNA methylation is not correlated with gene expression.
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Affiliation(s)
| | | | | | | | - Fong-Fong Chu
- Corresponding author: Fong-Fong Chu, 1500 East Duarte Road, Duarte, CA 91010, USA. Tel: 626-359-8111 x63831, FAX: 626-930-5330,
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Singh AK, Pandey N, Sinha M, Kaur P, Sharma S, Singh TP. Structural evidence for the order of preference of inorganic substrates in mammalian heme peroxidases: crystal structure of the complex of lactoperoxidase with four inorganic substrates, SCN, I, Br and Cl. INTERNATIONAL JOURNAL OF BIOCHEMISTRY AND MOLECULAR BIOLOGY 2011; 2:328-339. [PMID: 22187667 PMCID: PMC3242431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Accepted: 11/12/2011] [Indexed: 05/31/2023]
Abstract
Lactoperoxidase (LPO) is a member of the family of mammalian heme peroxidases. It catalyzes the oxidation of halides and pseudohalides in presence of hydrogen peroxide. LPO has been co-crystallized with inorganic substrates, SCN(-), I(-), Br(-) and Cl(-). The structure determination of the complex of LPO with above four substrates showed that all of them occupied distinct positions in the substrate binding site on the distal heme side. The bound substrate ions were separated from each other by one or more water molecules. The heme iron is coordinated to His-351 N(ϵ2) on the proximal side while it is coordinated to conserved water molecule W-1 on the distal heme side. W-1 is hydrogen bonded to Br(-) ion which is followed by Cl(-) ion with a hydrogen bonded water molecule W-5' between them. Next to Cl(-) ion is a hydrogen bonded water molecule W-7' which in turn is hydrogen bonded to W-8' and N atom of SCN(-). W-80 is hydrogen bonded to W-9' which is hydrogen bonded to I(-). SCN(-) ion also interacts directly with Asn-230 and through water molecules with Ser-235 and Phe-254. Therefore, according to the locations of four substrate anions, the order of preference for binding to lactoperoxidase is observed as Br(-) > Cl(-) > SCN(-) > I(-). The positions of anions are further defined in terms of subsites where Br(-) is located in subsite 1, Cl(-) in subsite 2, SCN(-) in subsite 3 and I(-) in subsite 4.
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Affiliation(s)
- Amit K Singh
- Department of Biophysics, All India Institute of Medical Sciences New Delhi India
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Al-Baarri AN, Hayashi M, Ogawa M, Hayakawa S. Effects of mono- and disaccharides on the antimicrobial activity of bovine lactoperoxidase system. J Food Prot 2011; 74:134-9. [PMID: 21219776 DOI: 10.4315/0362-028x.jfp-10-184] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The effects of mono- and disaccharides on the antimicrobial activity of the lactoperoxidase (LPO) system against Salmonella Enteritidis were investigated. The results clearly reveal that most of the sugars inhibit the antimicrobial activity of the LPO system. The inhibitory potency varies depending on the structure of sugar. L-Fructose and D-allose were strongly inhibitive to the action of the LPO system, while sucrose was the weakest inhibitor. The decreased antimicrobial activity is due to the reduction of LPO catalytic activity by sugar. An inhibitory kinetic study showed the noncompetitive inhibitor. D-Allose and L-fructose yielded strikingly low K(i) values of 0.36 and 0.42 mM, respectively, while the K(i) values of the other sugars ranged from 1.37 to 3.60 mM. Since LPO activity is inhibited by the saccharides, the sugar content in food should be considered when the LPO system is applied to the preservation of food.
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Affiliation(s)
- Ahmad Nimatullah Al-Baarri
- Department of Applied Biological Sciences, Kagawa University, 2393, Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0795, Japan
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33
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Kolaczkowski B, Kern AD, Holloway AK, Begun DJ. Genomic differentiation between temperate and tropical Australian populations of Drosophila melanogaster. Genetics 2011; 187:245-60. [PMID: 21059887 PMCID: PMC3018305 DOI: 10.1534/genetics.110.123059] [Citation(s) in RCA: 163] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Accepted: 11/03/2010] [Indexed: 11/18/2022] Open
Abstract
Determining the genetic basis of environmental adaptation is a central problem of evolutionary biology. This issue has been fruitfully addressed by examining genetic differentiation between populations that are recently separated and/or experience high rates of gene flow. A good example of this approach is the decades-long investigation of selection acting along latitudinal clines in Drosophila melanogaster. Here we use next-generation genome sequencing to reexamine the well-studied Australian D. melanogaster cline. We find evidence for extensive differentiation between temperate and tropical populations, with regulatory regions and unannotated regions showing particularly high levels of differentiation. Although the physical genomic scale of geographic differentiation is small--on the order of gene sized--we observed several larger highly differentiated regions. The region spanned by the cosmopolitan inversion polymorphism In(3R)P shows higher levels of differentiation, consistent with the major difference in allele frequencies of Standard and In(3R)P karyotypes in temperate vs. tropical Australian populations. Our analysis reveals evidence for spatially varying selection on a number of key biological processes, suggesting fundamental biological differences between flies from these two geographic regions.
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Affiliation(s)
- Bryan Kolaczkowski
- Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755 and Department of Evolution and Ecology, University of California, Davis, California 95616
| | - Andrew D. Kern
- Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755 and Department of Evolution and Ecology, University of California, Davis, California 95616
| | - Alisha K. Holloway
- Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755 and Department of Evolution and Ecology, University of California, Davis, California 95616
| | - David J. Begun
- Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755 and Department of Evolution and Ecology, University of California, Davis, California 95616
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Banerjee S, Furtmüller PG, Obinger C. Bovine lactoperoxidase - a versatile one- and two-electron catalyst of high structural and thermal stability. Biotechnol J 2010; 6:231-43. [PMID: 21298808 DOI: 10.1002/biot.201000375] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 11/09/2010] [Accepted: 11/11/2010] [Indexed: 11/07/2022]
Abstract
Lactoperoxidase (LPO), a member of the peroxidase-cyclooxygenase superfamily, is found in multiple human exocrine secretions and acts as a first line of defense against invading microorganisms by production of antimicrobial oxidants. Because of its ability to efficiently catalyze one- and two-electron oxidation reactions of inorganic and organic compounds, the heme peroxidase is widely used in food biotechnology, cosmetic industry, and diagnostic kits. In order to probe its structural integrity, conformational, and thermal stability, we have undertaken a comprehensive investigation by using complementary biophysical techniques including UV-Vis, circular dichroism and fluorescence spectroscopy as well as differential scanning calorimetry (DSC). The oxidoreductase exhibits a high chemical and thermal stability under oxidizing conditions but is significantly destabilized by addition of DTT. Due to its unique ester bonds between the prosthetic group and the protein as well as six intra-chain disulfides, unfolding of the central compact (-helical core occurs concomitantly with denaturation of the heme cavity. The corresponding enthalpic and entropic contributions to the free enthalpy of unfolding are presented. Together with spectroscopic data they will be discussed with respect to the known structure of bovine LPO and homologous myeloperoxidase as well as to its practical application.
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Affiliation(s)
- Srijib Banerjee
- Division of Biochemistry, Department of Chemistry, BOKU, University of Natural Resources and Life Sciences, Vienna, Austria
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35
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Pintus F, Spanò D, Bellelli A, Angelucci F, Scorciapino AM, Anedda R, Medda R, Floris G. Euphorbia Peroxidase Catalyzes Thiocyanate Oxidation in Two Different Ways, the Distal Calcium Ion Playing an Essential Role. Biochemistry 2010; 49:8739-47. [DOI: 10.1021/bi1007854] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Francesca Pintus
- Department of Applied Sciences in Biosystems, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - Delia Spanò
- Department of Applied Sciences in Biosystems, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - Andrea Bellelli
- Department of Biochemical Sciences “A. Rossi Fanelli”, University of Rome “La Sapienza”, and CNR Institute of Molecular Biology and Pathology, P.le Aldo Moro 5, I-00185 Roma, Italy
| | - Francesco Angelucci
- Department of Biochemical Sciences “A. Rossi Fanelli”, University of Rome “La Sapienza”, and CNR Institute of Molecular Biology and Pathology, P.le Aldo Moro 5, I-00185 Roma, Italy
| | - Andrea M. Scorciapino
- Department of Chemical Science, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - Roberto Anedda
- Porto Conte Ricerche srl, Loc. Tramariglio, I-07041 Alghero (SS), Italy
| | - Rosaria Medda
- Department of Applied Sciences in Biosystems, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - Giovanni Floris
- Department of Applied Sciences in Biosystems, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
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36
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Gumiero A, Murphy EJ, Metcalfe CL, Moody PC, Raven EL. An analysis of substrate binding interactions in the heme peroxidase enzymes: A structural perspective. Arch Biochem Biophys 2010; 500:13-20. [DOI: 10.1016/j.abb.2010.02.015] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2010] [Revised: 02/23/2010] [Accepted: 02/27/2010] [Indexed: 11/29/2022]
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37
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First structural evidence for the mode of diffusion of aromatic ligands and ligand-induced closure of the hydrophobic channel in heme peroxidases. J Biol Inorg Chem 2010; 15:1099-107. [DOI: 10.1007/s00775-010-0669-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Accepted: 04/27/2010] [Indexed: 11/26/2022]
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38
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Mathé C, Barre A, Jourda C, Dunand C. Evolution and expression of class III peroxidases. Arch Biochem Biophys 2010; 500:58-65. [PMID: 20398621 DOI: 10.1016/j.abb.2010.04.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Revised: 04/07/2010] [Accepted: 04/08/2010] [Indexed: 10/19/2022]
Abstract
Class III peroxidases are members of a large multigenic family, only detected in the plant kingdom and absent from green algae sensu stricto (chlorophyte algae or Chlorophyta). Their evolution is thought to be related to the emergence of the land plants. However class III peroxidases are present in a lower copy number in some basal Streptophytes (Charapyceae), which predate land colonization. Gene structures are variable among organisms and within species with respect to the number of introns, but their positions are highly conserved. Their high copy number, as well as their conservation could be related to plant complexity and adaptation to increasing stresses. No specific function has been assigned to respective isoforms, but in large multigenic families, particular structure-function relations can be expected. Plant peroxidase sequences contain highly conserved residues and motifs, variable domains surrounded by conserved residues and present a low identity level among their promoter regions, further suggesting the existence of sub-functionalization of the different isoforms.
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Affiliation(s)
- Catherine Mathé
- Université de Toulouse, UPS, UMR 5546, Surfaces Cellulaires et Signalisation chez les Végétaux, BP 42617, F-31326 Castanet-Tolosan, France
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39
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Murphy EJ, Maréchal A, Segal AW, Rich PR. CO binding and ligand discrimination in human myeloperoxidase. Biochemistry 2010; 49:2150-8. [PMID: 20146436 DOI: 10.1021/bi9021507] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Despite the fact that ferrous myeloperoxidase (MPO) can bind both O(2) and NO, its ability to bind CO has been questioned. UV/visible spectroscopy was used to confirm that CO induces small spectral shifts in ferrous MPO, and Fourier transform infrared difference spectroscopy showed definitively that these arose from formation of a heme ferrous-CO compound. Recombination rates after CO photolysis were monitored at 618 and 645 nm as a function of CO concentration and pH. At pH 6.3, k(on) and k(off) were 0.14 mM(-1) x s(-1) and 0.23 s(-1), respectively, yielding an unusually high K(D) of 1.6 mM. This affinity of MPO for CO is 10 times weaker than its affinity for O(2). The observed rate constant for CO binding increased with increasing pH and was governed by a single protonatable group with a pK(a) of 7.8. Fourier transform infrared spectroscopy revealed two different conformations of bound CO with frequencies at 1927 and 1942 cm(-1). Their recombination rate constants were identical, indicative of two forms of bound CO that are in rapid thermal equilibrium rather than two distinct protein populations with different binding sites. The ratio of bound states was pH-dependent (pK(a) approximately 7.4) with the 1927 cm(-1) form favored at high pH. Structural factors that account for the ligand-binding properties of MPO are identified by comparisons with published data on a range of other ligand-binding heme proteins, and support is given to the recent suggestion that the proximal His336 in MPO is in a true imidazolate state.
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Affiliation(s)
- Emma J Murphy
- Centre for Molecular Medicine, Division of Medicine, University College London, 5 University Street, London WC1E 6JJ, UK
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40
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Battistuzzi G, Bellei M, Bortolotti CA, Sola M. Redox properties of heme peroxidases. Arch Biochem Biophys 2010; 500:21-36. [PMID: 20211593 DOI: 10.1016/j.abb.2010.03.002] [Citation(s) in RCA: 155] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2010] [Revised: 03/01/2010] [Accepted: 03/02/2010] [Indexed: 10/19/2022]
Abstract
Peroxidases are heme enzymes found in bacteria, fungi, plants and animals, which exploit the reduction of hydrogen peroxide to catalyze a number of oxidative reactions, involving a wide variety of organic and inorganic substrates. The catalytic cycle of heme peroxidases is based on three consecutive redox steps, involving two high-valent intermediates (Compound I and Compound II), which perform the oxidation of the substrates. Therefore, the thermodynamics and the kinetics of the catalytic cycle are influenced by the reduction potentials of three redox couples, namely Compound I/Fe3+, Compound I/Compound II and Compound II/Fe3+. In particular, the oxidative power of heme peroxidases is controlled by the (high) reduction potential of the latter two couples. Moreover, the rapid H2O2-mediated two-electron oxidation of peroxidases to Compound I requires a stable ferric state in physiological conditions, which depends on the reduction potential of the Fe3+/Fe2+ couple. The understanding of the molecular determinants of the reduction potentials of the above redox couples is crucial for the comprehension of the molecular determinants of the catalytic properties of heme peroxidases. This review provides an overview of the data available on the redox properties of Fe3+/Fe2+, Compound I/Fe3+, Compound I/Compound II and Compound II/Fe3+ couples in native and mutated heme peroxidases. The influence of the electron donor properties of the axial histidine and of the polarity of the heme environment is analyzed and the correlation between the redox properties of the heme group with the catalytic activity of this important class of metallo-enzymes is discussed.
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Affiliation(s)
- Gianantonio Battistuzzi
- Department of Chemistry, University of Modena and Reggio Emilia, via Campi 183, 41100 Modena, Italy.
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41
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Battistuzzi G, Bellei M, Vlasits J, Banerjee S, Furtmüller PG, Sola M, Obinger C. Redox thermodynamics of lactoperoxidase and eosinophil peroxidase. Arch Biochem Biophys 2009; 494:72-7. [PMID: 19944669 DOI: 10.1016/j.abb.2009.11.021] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2009] [Revised: 11/10/2009] [Accepted: 11/13/2009] [Indexed: 10/20/2022]
Abstract
Eosinophil peroxidase (EPO) and lactoperoxidase (LPO) are important constituents of the innate immune system of mammals. These heme enzymes belong to the peroxidase-cyclooxygenase superfamily and catalyze the oxidation of thiocyanate, bromide and nitrite to hypothiocyanate, hypobromous acid and nitrogen dioxide that are toxic for invading pathogens. In order to gain a better understanding of the observed differences in substrate specificity and oxidation capacity in relation to heme and protein structure, a comprehensive spectro-electrochemical investigation was performed. The reduction potential (E degrees ') of the Fe(III)/Fe(II) couple of EPO and LPO was determined to be -126mV and -176mV, respectively (25 degrees C, pH 7.0). Variable temperature experiments show that EPO and LPO feature different reduction thermodynamics. In particular, reduction of ferric EPO is enthalpically and entropically disfavored, whereas in LPO the entropic term, which selectively stabilizes the oxidized form, prevails on the enthalpic term that favors reduction of Fe(III). The data are discussed with respect to the architecture of the heme cavity and the substrate channel. Comparison with published data for myeloperoxidase demonstrates the effect of heme to protein linkages and heme distortion on the redox chemistry of mammalian peroxidases and in consequence on the enzymatic properties of these physiologically important oxidoreductases.
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Affiliation(s)
- Gianantonio Battistuzzi
- Department of Chemistry, University of Modena and Reggio Emilia, via Campi 183, Modena, Italy.
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Singh AK, Kumar RP, Pandey N, Singh N, Sinha M, Bhushan A, Kaur P, Sharma S, Singh TP. Mode of binding of the tuberculosis prodrug isoniazid to heme peroxidases: binding studies and crystal structure of bovine lactoperoxidase with isoniazid at 2.7 A resolution. J Biol Chem 2009; 285:1569-76. [PMID: 19907057 DOI: 10.1074/jbc.m109.060327] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Isoniazid (INH) is an anti-tuberculosis prodrug that is activated by mammalian lactoperoxidase and Mycobacterium tuberculosis catalase peroxidase (MtCP). We report here binding studies, an enzyme assay involving INH, and the crystal structure of the complex of bovine lactoperoxidase (LPO) with INH to illuminate binding properties and INH activation as well as the mode of diffusion and interactions together with a detailed structural and functional comparison with MtCP. The structure determination shows that isoniazid binds to LPO at the substrate binding site on the distal heme side. The substrate binding site is connected to the protein surface through a long hydrophobic channel. The acyl hydrazide moiety of isoniazid interacts with Phe(422) O, Gln(423) O(epsilon1), and Phe(254) O. In this arrangement, pyridinyl nitrogen forms a hydrogen bond with a water molecule, W-1, which in turn forms three hydrogen bonds with Fe(3+), His(109) N(epsilon2), and Gln(105) N(epsilon2). The remaining two sides of isoniazid form hydrophobic interactions with the atoms of heme pyrrole ring A, C(beta) and C(gamma) atoms of Glu(258), and C(gamma) and C(delta) atoms of Arg(255). The binding studies indicate that INH binds to LPO with a value of 0.9 x 10(-6) m for the dissociation constant. The nitro blue tetrazolium reduction assay shows that INH is activated by the reaction of LPO-H(2)O(2) with INH. This suggests that LPO can be used for INH activation. It also indicates that the conversion of INH into isonicotinoyl radical by LPO may be the cause of INH toxicity.
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Affiliation(s)
- Amit K Singh
- Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110 029, India
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Singh AK, Singh N, Sinha M, Bhushan A, Kaur P, Srinivasan A, Sharma S, Singh TP. Binding modes of aromatic ligands to mammalian heme peroxidases with associated functional implications: crystal structures of lactoperoxidase complexes with acetylsalicylic acid, salicylhydroxamic acid, and benzylhydroxamic acid. J Biol Chem 2009; 284:20311-8. [PMID: 19465478 PMCID: PMC2740456 DOI: 10.1074/jbc.m109.010280] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2009] [Indexed: 11/06/2022] Open
Abstract
The binding and structural studies of bovine lactoperoxidase with three aromatic ligands, acetylsalicylic acid (ASA), salicylhydoxamic acid (SHA), and benzylhydroxamic acid (BHA) show that all the three compounds bind to lactoperoxidase at the substrate binding site on the distal heme side. The binding of ASA occurs without perturbing the position of conserved heme water molecule W-1, whereas both SHA and BHA displace it by the hydroxyl group of their hydroxamic acid moieties. The acetyl group carbonyl oxygen atom of ASA forms a hydrogen bond with W-1, which in turn makes three other hydrogen-bonds, one each with heme iron, His-109 N(epsilon2), and Gln-105 N(epsilon2). In contrast, in the complexes of SHA and BHA, the OH group of hydroxamic acid moiety in both complexes interacts with heme iron directly with Fe-OH distances of 3.0 and 3.2A respectively. The OH is also hydrogen bonded to His-109 N(epsilon2) and Gln-105N(epsilon2). The plane of benzene ring of ASA is inclined at 70.7 degrees from the plane of heme moiety, whereas the aromatic planes of SHA and BHA are nearly parallel to the heme plane with inclinations of 15.7 and 6.2 degrees , respectively. The mode of ASA binding provides the information about the mechanism of action of aromatic substrates, whereas the binding characteristics of SHA and BHA indicate the mode of inhibitor binding.
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Affiliation(s)
- Amit K. Singh
- From the Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Nagendra Singh
- From the Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Mau Sinha
- From the Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Asha Bhushan
- From the Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Punit Kaur
- From the Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Alagiri Srinivasan
- From the Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Sujata Sharma
- From the Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Tej P. Singh
- From the Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
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