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Rajiv Gandhi G, Sharanya CS, Jayanandan A, Haridas M, Edwin Hillary V, Rajiv Gandhi S, Sridharan G, Sivasubramanian R, Silva Vasconcelos AB, Montalvão MM, Antony Ceasar S, Sousa NFD, Scotti L, Scotti MT, Gurgel RQ, Quintans-Júnior LJ. Multitargeted molecular docking and dynamics simulation studies of flavonoids and volatile components from the peel of Citrus sinensis L. (Osbeck) against specific tumor protein markers. J Biomol Struct Dyn 2024; 42:3051-3080. [PMID: 37203996 DOI: 10.1080/07391102.2023.2212062] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 05/01/2023] [Indexed: 05/20/2023]
Abstract
Citrus sinensis (L.) Osbeck (Rutaceae), commonly known as the sweet orange, is a popular and widely consumed fruit with several medicinal properties. The present study aimed to perform the in silico screening of 18 flavonoids and eight volatile components from the peel of C. sinensis against apoptotic and inflammatory proteins, metalloprotease, and tumor suppressor markers. Flavonoids obtained higher probabilities than volatile components against selected anti-cancer drug targets. Hence, the data from the binding energies against the essential apoptotic and cell proliferation proteins substantiate that they may be promising compounds in developing effective candidates to block cell growth, proliferation, and induced cell death by activating the apoptotic pathway. Further, the binding stability of the selected targets and the corresponding molecules were analyzed by 100 ns molecular dynamics (MD) simulations. Chlorogenic acid has the most binding affinity against the important anti-cancer targets iNOS, MMP-9, and p53. The congruent binding mode to different drug targets focused on cancer shown by chlorogenic acid suggests that it may be a compound with significant therapeutic potential. Moreover, the binding energy predictions indicated that the compound had stable electrostatic and van der Waal energies. Thus, our data reinforce the medicinal importance of flavonoids from C. sinensis and expand the need for more studies, seeking to optimize results and amplify the impacts of further in vitro and in vivo studies. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Gopalsamy Rajiv Gandhi
- Division of Phytochemistry and Drug Design, Department of Biosciences, Rajagiri College of Social Sciences, Kalamassery, Kochi, India
| | - Chelankara Suresh Sharanya
- Division of Phytochemistry and Drug Design, Department of Biosciences, Rajagiri College of Social Sciences, Kalamassery, Kochi, India
| | - Abhithaj Jayanandan
- Department of Biotechnology and Microbiology, Dr. Janaki Ammal Campus, Kannur University, Thalassery, Kannur, India
| | - Madathilkovilakath Haridas
- Department of Biotechnology and Microbiology, Dr. Janaki Ammal Campus, Kannur University, Thalassery, Kannur, India
| | - Varghese Edwin Hillary
- Division of Plant Molecular Biology and Biotechnology, Department of Biosciences, Rajagiri College of Social Sciences, Kalamassery, Kochi, India
| | - Sathiyabama Rajiv Gandhi
- Laboratory of Neuroscience and Pharmacological Assays (LANEF), Department of Physiology (DFS), Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
- Postgraduate Program of Health Sciences (PPGCS), University Hospital, Federal University of Sergipe (HU-UFS), Aracaju, Sergipe, Brazil
| | - Gurunagarajan Sridharan
- Department of Biochemistry, Srimad Andavan Arts and Science College (Autonomous), Affiliated to Bharathidasan University, Tiruchirapalli, India
| | - Rengaraju Sivasubramanian
- Department of Biochemistry, Srimad Andavan Arts and Science College (Autonomous), Affiliated to Bharathidasan University, Tiruchirapalli, India
| | - Alan Bruno Silva Vasconcelos
- Postgraduate Program of Physiological Sciences (PROCFIS), Federal University of Sergipe (UFS), São Cristóvão, Sergipe, Brazil
| | - Monalisa Martins Montalvão
- Postgraduate Program of Health Sciences (PPGCS), University Hospital, Federal University of Sergipe (HU-UFS), Aracaju, Sergipe, Brazil
| | - Stanislaus Antony Ceasar
- Division of Plant Molecular Biology and Biotechnology, Department of Biosciences, Rajagiri College of Social Sciences, Kalamassery, Kochi, India
| | - Natália Ferreira de Sousa
- Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraíba, Paraíba, Brazil
| | - Luciana Scotti
- Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraíba, Paraíba, Brazil
| | - Marcus Tullius Scotti
- Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraíba, Paraíba, Brazil
| | - Ricardo Queiroz Gurgel
- Postgraduate Program of Health Sciences (PPGCS), University Hospital, Federal University of Sergipe (HU-UFS), Aracaju, Sergipe, Brazil
| | - Lucindo José Quintans-Júnior
- Laboratory of Neuroscience and Pharmacological Assays (LANEF), Department of Physiology (DFS), Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
- Postgraduate Program of Health Sciences (PPGCS), University Hospital, Federal University of Sergipe (HU-UFS), Aracaju, Sergipe, Brazil
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Sharanya CS, Abhithaj J, Arun KG, Eeda KR, Bhat V, Variyar EJ, Sabu A, Haridas M. Lipoxygenase inhibitory synthetic derivatives of methyl gallate regulate gene expressions of COX-2 and cytokines to reduce animal model arthritis. Sci Rep 2023; 13:10644. [PMID: 37391468 PMCID: PMC10313808 DOI: 10.1038/s41598-023-37613-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 06/24/2023] [Indexed: 07/02/2023] Open
Abstract
Mammalian lipoxygenases (LOXs) are involved in the biosynthesis of mediators of anaphylactic reactions and have been implicated in cell maturation, the pathogenesis of bronchial asthma, atherosclerosis, rheumatoid arthritis, cardiovascular diseases, Alzheimer's disease and osteoporosis. Hence LOX inhibition in chronic conditions can lead to reducing the disease progression, which can be a good target for treating these diseases. The present study deals with designing methyl gallate derivatives and their anti-inflammatory effect by in silico, in vitro and in vivo methods. Designed derivatives were docked against LOX enzyme, and molecular dynamic simulations were carried out. Following the synthesis of derivatives, in vitro LOX inhibition assay, enzyme kinetics and fluorescence quenching studies were performed. One of the derivatives of methyl gallate (MGSD 1) was demonstrated as an anti-inflammatory agent for the treatment of rheumatoid arthritis in the animal model. Amelioration of Freund's complete adjuvant (FCA)-induced arthritis by methyl gallate and its derivative with a concentration of 10-40 mg.kg-1 has been assessed in vivo in a 28-day-long study. TNF-α and COX-2 gene expression were also studied. Methyl gallate synthetic derivatives (MGSDs) inhibited LOX with an IC50 of 100 nM, 304 nM, and 226 nM for MGSD 1, MGSD 2, and MGSD 3, respectively. Fluorescence quenching methods also prove their binding characteristics, and 200 ns simulations studies showed that the RMSDs for the entire complex were less than 2.8 Å. The in vivo results showed that methyl gallate was required approximately five times diclofenac for the same level of effect, and the synthesised (MGSD 1) compound required only approximately 1/12 of diclofenac for the same level of effect in in-vivo studies. The preeminent expression of COX-2 and TNF-α genes was significantly decreased after the treatment of the methyl gallate derivative. Hence, the in vivo results showed that the referenced synthetic derivative might have more arthritis-reducing properties than the parent compound methyl gallate and is more potent than the standard drug diclofenac, with no apparent induced toxicity.
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Affiliation(s)
- C S Sharanya
- Department of Biotechnology and Microbiology and IUCB, Dr Janaki Ammal Campus, Kannur University, Palayad, Thalassery, Kannur, Kerala, 670661, India
- Transdisciplinary Biology, Rajiv Gandhi Centre for Biotechnology (RGCB), Thiruvananthapuram, Kerala, 695014, India
| | - J Abhithaj
- Department of Biotechnology and Microbiology and IUCB, Dr Janaki Ammal Campus, Kannur University, Palayad, Thalassery, Kannur, Kerala, 670661, India
| | - K G Arun
- Department of Biotechnology and Microbiology and IUCB, Dr Janaki Ammal Campus, Kannur University, Palayad, Thalassery, Kannur, Kerala, 670661, India
| | - Koti Reddy Eeda
- Department of Chemistry, Vignan Foundation for Science Technology and Research, Vignan University (Deemed to be University), Vadlamudi, Guntur, Andhra Pradesh, 522 213, India
| | - Vignesh Bhat
- Department of Chemistry, Mangalore University, Mangalagangothri, Karnataka, 574 199, India
| | - E J Variyar
- Department of Biotechnology and Microbiology and IUCB, Dr Janaki Ammal Campus, Kannur University, Palayad, Thalassery, Kannur, Kerala, 670661, India
| | - A Sabu
- Department of Biotechnology and Microbiology and IUCB, Dr Janaki Ammal Campus, Kannur University, Palayad, Thalassery, Kannur, Kerala, 670661, India
| | - M Haridas
- Department of Biotechnology and Microbiology and IUCB, Dr Janaki Ammal Campus, Kannur University, Palayad, Thalassery, Kannur, Kerala, 670661, India.
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Abhilash J, Haridas M. Editorial Expression of Concern: Metal Ion Coordination Essential for Specific Molecular Interactions of Butea monosperma Lectin: ITC and MD Simulation Studies. Appl Biochem Biotechnol 2023; 195:1605. [PMID: 36260250 DOI: 10.1007/s12010-022-04192-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- J Abhilash
- Inter-University Centre for Bioscience and Department of Biotechnology and Microbiology, Kannur University, Thalassery Campus, Palayad, Kerala, 670 661, India
| | - M Haridas
- Inter-University Centre for Bioscience and Department of Biotechnology and Microbiology, Kannur University, Thalassery Campus, Palayad, Kerala, 670 661, India.
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Sharanya CS, Sabu A, Haridas M. Potent phytochemicals against COVID-19 infection from phyto-materials used as antivirals in complementary medicines: a review. Futur J Pharm Sci 2021; 7:113. [PMID: 34095323 PMCID: PMC8170460 DOI: 10.1186/s43094-021-00259-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 05/10/2021] [Indexed: 12/23/2022] Open
Abstract
Background Following the outbreak of the COVID-19 pandemic, there was a surge of research activity to find methods/drugs to treat it. There has been drug-repurposing research focusing on traditional medicines. Concomitantly, many researchers tried to find in silico evidence for traditional medicines. There is a great increase in article publication to commensurate the new-found research interests. This situation inspired the authors to have a comprehensive understanding of the multitude of publications related to the COVID-19 pandemic with a wish to get promising drug leads. Main body This review article has been conceived and made as a hybrid of the review of the selected papers advertised recently and produced in the interest of the COVID-19 situation, and in silico work done by the authors. The outcome of the present review underscores a recommendation for thorough MDS analyses of the promising drug leads. The inclusion of in silico work as an addition to the review was motivated by a recently published article of Toelzer and colleagues. The in silico investigation of free fatty acids is novel to the field and it buttresses the further MDS analysis of drug leads for managing the COVID-19 pandemic. Conclusion The review performed threw light on the need for MDS analyses to be considered together with the application of other in silico methods of prediction of pharmacologic properties directing towards the sites of drug-receptor regulation. Also, the present analysis would help formulate new recipes for complementary medicines.
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Affiliation(s)
- C S Sharanya
- Inter University Centre for Bioscience and Department of Biotechnology & Microbiology, Dr. Janaki Ammal Campus, Kannur University, Thalassery, 670661 India
| | - A Sabu
- Inter University Centre for Bioscience and Department of Biotechnology & Microbiology, Dr. Janaki Ammal Campus, Kannur University, Thalassery, 670661 India
| | - M Haridas
- Inter University Centre for Bioscience and Department of Biotechnology & Microbiology, Dr. Janaki Ammal Campus, Kannur University, Thalassery, 670661 India
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Vijaytha V, Anupama RV, Haridas M. Phytochemical profiling, and anti-oxidant, anti-bacterial, and anti-inflammatory properties of Viburnum coriaceum Blume. Futur J Pharm Sci 2020. [DOI: 10.1186/s43094-020-00098-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Viburnums comprise a taxonomic group of plants distributed all over the world and were reported to have many biological activities. Viburnum coriaceum Blume is one of the least explored members of the group. The present study was aimed to explore the phytochemical profile of the plant, Viburnum coriaceum Blume with special emphasis to its anti-oxidant, anti-bacterial, and anti-inflammatory activities.
Results
Extracts of all parts of plants were found to possess a spectrum of chemicals in considerable amount, including triterpenoids and glycosides. Anti-oxidant property was found in extracts made of any part of the plant. Methanol extract of root expressed a prominent zone of inhibition in agar gel well-diffusion assay involving many microorganisms. Inhibition of enzymes, LOX, and trypsin showed by the hexane extract of root suggested a prominent anti-inflammatory potential of the plant under investigation.
Conclusion
Phytochemical profiling and the other assays using the plant extracts provide us with a plant having many valuable medicinal properties. Viburnum coriaceum Blume could be noted as a promising material for drug leads.
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Mousumi Das M, Haridas M, Sabu A. Process development for the enhanced production of bio-nematicide Purpureocillium lilacinum KU8 under solid-state fermentation. Bioresour Technol 2020; 308:123328. [PMID: 32280004 DOI: 10.1016/j.biortech.2020.123328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 04/01/2020] [Accepted: 04/03/2020] [Indexed: 06/11/2023]
Abstract
Response surface methodology (RSM) was used to optimize the process parameters for maximizing the biomass production of Purpureocillium lilacinum KU8 using wheat bran as substrate under solid-state fermentation (SSF). The experiments of one-factor-at-a-time approach (OFAT) for central composite design (CCD) to analyze the response pattern brought out the parameters for maximum biomass production. Moisture content, yeast extract and incubation time were found to be the three significant, independent variables responsible for maximum biomass production. The biomass production was 107.46 mg/gdfs which was 1.35 times higher than that of OFAT method and 3.01 times higher than the randomly selected conditions. The optimum conditions established by RSM method for the maximum biomass production are 67.98%, 2.29% and 142.2 h respectively for moisture content, yeast extract and incubation time. The biomass thus produced had quantitatively comparable results in bio-nematicide effectiveness.
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Affiliation(s)
- M Mousumi Das
- Centre for Bio-innovation and Product Development, Department of Biotechnology & Microbiology, Kannur University, Dr. Janaki Ammal Campus, Thalassery, Kannur 670661, Kerala, India
| | - M Haridas
- Centre for Bio-innovation and Product Development, Department of Biotechnology & Microbiology, Kannur University, Dr. Janaki Ammal Campus, Thalassery, Kannur 670661, Kerala, India
| | - A Sabu
- Centre for Bio-innovation and Product Development, Department of Biotechnology & Microbiology, Kannur University, Dr. Janaki Ammal Campus, Thalassery, Kannur 670661, Kerala, India.
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Abhithaj J, Arun KG, Sharanya CS, Haridas M, Jayadevi Variyar E. Isozymes inhibited by active site blocking: versatility of calcium indifferent hesperidin binding to phospholipase A 2 and its significance. J Recept Signal Transduct Res 2019; 39:60-66. [PMID: 31084404 DOI: 10.1080/10799893.2019.1606239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
sPLA2 is released under inflammatory conditions from neutrophils, basophils and T-cells. They cleave the cellular phospholipids leading to the release of arachidonic acid and there by provide intermediates for biosynthesis of inflammatory mediators. The focus of this study is on the interaction of hesperidin, a natural flavonoid with Group IB, IIA, and V and X isozymes of sPLA2. Affinity of hesperidin towards PLA2 isozymes was analyzed through enzymatic studies and molecular modeling. The experiments showed that hesperidin competitively inhibited PLA2 with IC50 of 5.1 µM. Molecular modeling studies revealed the association of hesperidin with the docking scores -6.90, -9.53, -5.63 and -8.29 kcal for isozymes Group IB, IIA, V and X of PLA2 respectively. Their binding energy values were calculated as -20.25, -21.63, -21.66 and -33.43 kcal for the Group IB, IIA, V and X respectively. Structural model for Group V was made by homology modeling since no structural coordinates were available. Molecular dynamics studies were carried out to evaluate the structural stability of protein ligand complex. The analyses showed that hesperidin blocked the entry of the substrate to the active site of PLA2 and it was indifferent to the differences of the isozymes. Hence, hesperidin might serve as lead for designing highly specific anti-inflammatory drugs directed to the PLA2 isozyme specific to various diseases, with IC50 value of therapeutic significance.
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Affiliation(s)
- J Abhithaj
- a Department of Biotechnology & Microbiology , Inter University Centre for Bioscience, Kannur University , Palayad , India
| | - K G Arun
- a Department of Biotechnology & Microbiology , Inter University Centre for Bioscience, Kannur University , Palayad , India
| | - C S Sharanya
- a Department of Biotechnology & Microbiology , Inter University Centre for Bioscience, Kannur University , Palayad , India
| | - M Haridas
- a Department of Biotechnology & Microbiology , Inter University Centre for Bioscience, Kannur University , Palayad , India
| | - E Jayadevi Variyar
- a Department of Biotechnology & Microbiology , Inter University Centre for Bioscience, Kannur University , Palayad , India
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Prasanth S, Haridas KR, Haridas M, Sabu A. Novel lipoxygenase inhibitor, 1-ethenoxy-2-methylbenzene, from marine cyanobacteria Microcoleus chthonoplastes. Nat Prod Res 2017; 32:2910-2915. [DOI: 10.1080/14786419.2017.1392949] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- S. Prasanth
- Inter University Centre for Bioscience and Department of Biotechnology and Microbiology, Kannur University, Kannur, India
| | - K. R Haridas
- School of Chemical Sciences, Kannur University, Kannur, India
| | - M. Haridas
- Inter University Centre for Bioscience and Department of Biotechnology and Microbiology, Kannur University, Kannur, India
| | - A. Sabu
- Inter University Centre for Bioscience and Department of Biotechnology and Microbiology, Kannur University, Kannur, India
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Chandrika BB, Steephan M, Kumar TRS, Sabu A, Haridas M. Hesperetin and Naringenin sensitize HER2 positive cancer cells to death by serving as HER2 Tyrosine Kinase inhibitors. Life Sci 2016; 160:47-56. [PMID: 27449398 DOI: 10.1016/j.lfs.2016.07.007] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 07/08/2016] [Accepted: 07/18/2016] [Indexed: 11/24/2022]
Abstract
AIM Aberrant human epidermal growth factor receptor-2 (HER2) expression and constitutive mutant activation of its tyrosine kinase domain account for tumor aggression and therapy resistance in many types of cancers with major share in breast cancer cases. HER2 specific treatment modalities still face challenges owing to the side effects and acquired resistance of available therapeutics. Recently, the anti-proliferative and pro-apoptotic potential of phytochemicals, especially of flavonoids have become increasingly appreciated as powerful chemo preventive agents. Consequently, the major goal of our study is to identify flavonoids capable of inhibiting HER2 Tyrosine Kinase (HER2-TK) activity and validate their anti-tumor activity against HER2 positive tumors. MAIN METHODS Molecular docking studies for identifying flavonoids binding at HER2 kinase domain, ADP-Glo™ Kinase Assay for determining kinase activity, MTT assay to measure growth inhibition, various apoptotic assays and cell cycle analysis by FACS were performed. KEY FINDINGS Among the flavonoids screened, Naringenin (NG) and Hesperetin (HP) possessed high glide scores from molecular docking studies of enzyme-inhibitor mode. The interaction analysis revealed their ability to establish stable and strong interaction at the ATP binding site of HER2-TK. These compounds also inhibited in vitro HER2-TK activity suggesting their role as HER2 inhibitors. The study also unraveled the anti-proliferative, pro-apoptotic and anti-cancerous activity of these flavonoids against HER2 positive breast cancer cell line. SIGNIFICANCE The study identified two citrus fruit flavonoids, NG and HP as HER2-TK inhibitors and this is the first report on their potential to target preferentially and sensitize HER2 positive cancer cells to cell death.
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Affiliation(s)
- Bhavya Balan Chandrika
- Inter University Centre for Bioscience and Department of Biotechnology & Microbiology, Kannur University Thalassery Campus, Kannur 670 661, Kerala, India.
| | - Mathew Steephan
- Govt Brennen College, Kannur University, Kannur 670 661, Kerala, India
| | | | - A Sabu
- Inter University Centre for Bioscience and Department of Biotechnology & Microbiology, Kannur University Thalassery Campus, Kannur 670 661, Kerala, India
| | - M Haridas
- Inter University Centre for Bioscience and Department of Biotechnology & Microbiology, Kannur University Thalassery Campus, Kannur 670 661, Kerala, India.
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Affiliation(s)
| | | | - M. Haridas
- Inter
University Centre for Bioscience, Kannur University, Thalassery
Campus, Palayad, Kerala 670661, India
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Naveen Chandra D, Preethidan D, Sabu A, Haridas M. Traditional fermentation of Ayurvedic medicine yields higher proinflammatory enzyme inhibition compared to wine-model product. Frontiers in Life Science 2015. [DOI: 10.1080/21553769.2015.1005245] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abhilash J, Geethanandan K, Bharath S, Sabu A, Sadasivan C, Haridas M. The crystal structure of a lectin from Butea monosperma: Insight into its glycosylation and binding of ligands. Int J Biol Macromol 2015; 72:1376-83. [DOI: 10.1016/j.ijbiomac.2014.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 09/30/2014] [Accepted: 10/01/2014] [Indexed: 10/24/2022]
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Tomy MJ, Dileep KV, Prasanth S, Preethidan DS, Sabu A, Sadasivan C, Haridas M. Cuminaldehyde as a lipoxygenase inhibitor: in vitro and in silico validation. Appl Biochem Biotechnol 2014; 174:388-97. [PMID: 25080377 DOI: 10.1007/s12010-014-1066-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Accepted: 07/21/2014] [Indexed: 11/27/2022]
Abstract
The search for lipoxygenase (LOX) inhibitors has been carried out for decades due to its importance in inflammatory diseases. In the present study, it was observed that the methanolic extract of Cuminum cyminum L. inhibited LOX activity. Activity-guided screening of the C. cyminum crude extracts helped the identification and isolation of cuminaldehyde as a 15-LOX inhibitor. The enzyme kinetics analysis suggested cuminaldehyde to be a competitive inhibitor and the IC 50 value derived from LB plots is 1,370 μM. Binding constants of cuminaldehyde on LOX was deduced by isothermal titration calorimetry. The combined thermodynamics and molecular modeling analyses suggested cuminaldehyde as a competitive LOX inhibitor. It is proposed from the present study that the coordinate bond between the Fe(2+) atom in the active site of the enzyme and the cuminaldehyde may be responsible for the enzyme inhibition. The study suggests that cuminaldehyde may be acting as an anti-inflammatory compound and may be therefore included in the category of leads for developing dual COX-LOX inhibitors as non-steroidal anti-inflammatory drugs (NSAIDs).
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Affiliation(s)
- M J Tomy
- Inter University Centre for Bioscience and Department of Biotechnology and Microbiology, Kannur University, Thalassery Campus, Palayad, 670661, India
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Tintu I, Abhilash J, Dileep KV, Augustine A, Haridas M, Sadasivan C. A lectin from Spatholobus parviflorus inhibits Aspergillus flavus α-amylase: enzyme kinetics and thermodynamic studies. Chem Biol Drug Des 2014; 84:116-22. [PMID: 24460654 DOI: 10.1111/cbdd.12291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Revised: 10/30/2013] [Accepted: 01/19/2014] [Indexed: 11/27/2022]
Abstract
Aspergillus flavus is a commonly found fungal pathogen which produces structurally related and highly toxic secondary metabolites, aflatoxins. It has been proposed that α-amylase inhibitors may limit the ability of the fungus to produce aflatoxins. Hence, this enzyme is a potent target for the development of antifungal agents. In this study, it was found that Spatholobus parviflorus seed lectin (SPL) can inhibit the growth of A. flavus with a MIC value of 1.5 mg/mL. The enzyme kinetics, molecular modeling and isothermal titration calorimetric studies suggest that SPL can inhibit α-amylase with Ki value of 0.0042 mm. Hence, it is suggested that the antifungal activity of SPL might be partly due to its ability to inhibit the enzyme α-amylase.
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Affiliation(s)
- Ignatius Tintu
- Department of Biotechnology & Microbiology, Inter-University Centre for Bioscience, Kannur University, Thalassery Campus, Palayad, 670661, India
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Dileep K, Remya C, Tintu I, Haridas M, Sadasivan C. Binding of NDGA and morin with phospholipase A2: experimental and computational evidences. Molecular Simulation 2014. [DOI: 10.1080/08927022.2013.875621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Dileep K, Remya C, Tintu I, Haridas M, Sadasivan C. Inhibitory activity of IAA and IBA against lipoxygenase:in silicoandin vitrovalidation. Molecular Simulation 2013. [DOI: 10.1080/08927022.2013.817671] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Aparna V, Dileep KV, Sadasivan C, Haridas M. Computational and thermodynamic analyses of the phospholipase A2 inhibition by erucic acid and linoleic acid. Med Chem Res 2012. [DOI: 10.1007/s00044-012-0114-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Roopesh K, Abhilash J, Haridas M, Sabu A, Isabelle PG, Roussos S, Augur C. Dioxygenase from Aspergillus fumigatusMC8: molecular modelling and in silicostudies on enzyme–substrate interactions. Molecular Simulation 2012. [DOI: 10.1080/08927022.2011.608672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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19
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Dileep KV, Tintu I, Mandal PK, Karthe P, Haridas M, Sadasivan C. Crystal structure of porcine pancreatic phospholipase A2in complex with 2-methoxycyclohexa-2-5-diene-1,4-dione. Frontiers in Life Science 2011. [DOI: 10.1080/21553769.2012.689262] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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20
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Geethanandan K, Abhilash J, Bharath S, Sadasivan C, Haridas M. X-ray structure of a galactose-specific lectin from Spatholobous parviflorous. Int J Biol Macromol 2011; 49:992-8. [DOI: 10.1016/j.ijbiomac.2011.08.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Revised: 08/11/2011] [Accepted: 08/20/2011] [Indexed: 10/17/2022]
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21
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Geethanandan K, Abhilash J, Bharath SR, Sadasivan C, Haridas M. Crystallization and preliminary X-ray studies of a galactose-specific lectin from the seeds of Spatholobus parviflorus. Acta Crystallogr Sect F Struct Biol Cryst Commun 2011; 67:700-2. [PMID: 21636916 DOI: 10.1107/s174430911101387x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Accepted: 04/12/2011] [Indexed: 11/11/2022]
Abstract
A galactose-specific seed lectin was purified from the legume Spatholobus parviflorus and crystallized using the hanging-drop vapour-diffusion technique. The crystals belonged to space group P1, with unit-cell parameters a = 60.998, b = 60.792, c = 78.179 Å, α = 101.32, β = 91.38, γ = 104.32°. X-ray diffraction data were collected under cryoconditions (100 K) to a resolution of 2.04 Å using a MAR image-plate detector system mounted on a rotating-anode X-ray (Cu Kα) generator. Molecular replacement using legume-lectin coordinates as a search model gave a tetrameric structure.
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Affiliation(s)
- K Geethanandan
- Department of Biotechnology and Microbiology, Kannur University, Kerala, India
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22
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Chandra DN, Prasanth GK, Singh N, Kumar S, Jithesh O, Sadasivan C, Sharma S, Singh TP, Haridas M. Identification of a novel and potent inhibitor of phospholipase A(2) in a medicinal plant: crystal structure at 1.93Å and Surface Plasmon Resonance analysis of phospholipase A(2) complexed with berberine. Biochim Biophys Acta 2011; 1814:657-63. [PMID: 21420512 DOI: 10.1016/j.bbapap.2011.03.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2010] [Revised: 02/26/2011] [Accepted: 03/03/2011] [Indexed: 01/22/2023]
Abstract
Crystal of Russell Viper venom phospholipase A(2) complexed with an isoquinoline alkaloid, berberine from a herbaceous plant Cardiospermum halicacabum, was prepared and its structure was solved by X-ray crystallography. The crystal diffracted up to 1.93Å and the structure solution clearly located the position of berberine in the active site of the enzyme. Two hydrogen bonds, one direct and the other water mediated, were formed between berberine and the enzyme. Gly 30 and His 48 made these two hydrogen bonds. Additionally, the hydrophobic surface of berberine made a number of hydrophobic contacts with side chains of neighboring amino acids. Surface Plasmon Resonance studies revealed strong binding affinity between berberine and phospholipase A(2). Enzyme inhibition studies proved that berberine is a competitive inhibitor of phospholipase A(2). It was inferred that the isoquinoline alkaloid, berberine, is a potent natural inhibitor of phospholipaseA(2).
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Affiliation(s)
- D Naveen Chandra
- Department of Biotechnology & Microbiology, Kannur University, Palayad, Kerala 670661, India
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23
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Abhilash J, Geethanandan K, Bharath SR, Sadasivan C, Haridas M. Crystallization and preliminary X-ray diffraction analysis of a galactose-specific lectin from the seeds of Butea monosperma. Acta Crystallogr Sect F Struct Biol Cryst Commun 2011; 67:524-6. [PMID: 21505258 DOI: 10.1107/s1744309111006853] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 02/22/2011] [Indexed: 11/10/2022]
Abstract
The galactose-specific lectin from the seeds of Butea monosperma has been crystallized by the hanging-drop vapour-diffusion technique. The crystals belonged to space group P1, with unit-cell parameters a = 78.45, b = 78.91, c = 101.85 Å, α = 74.30, β = 76.65, γ = 86.88°. X-ray diffraction data were collected to a resolution of 2.44 Å under cryoconditions (100 K) using a MAR image-plate detector system mounted on a rotating-anode X-ray generator. Molecular-replacement calculations carried out using the coordinates of several structures of legume lectins as search models indicate that the galactose-specific lectin from B. monosperma forms an octamer.
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Affiliation(s)
- Joseph Abhilash
- Department of Biotechnology and Microbiology, Kannur University, Kannur, Kerala 670 661, India
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24
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Abstract
Thin films of hybrid arrays of cadmium selenide quantum dots and polymer grafted gold nanoparticles have been prepared using a BCP template. Controlling the dispersion and location of the respective nanoparticles allows us to tune the exciton-plasmon interaction in such hybrid arrays and hence control their optical properties. The observed photoluminescence of the hybrid array films is interpreted in terms of the dispersion and location of the gold nanoparticles and quantum dots in the block copolymer matrix.
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Affiliation(s)
- M Haridas
- Department of Physics, Indian Institute of Science, Bangalore, India
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25
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Roopesh K, Guyot S, Sabu A, Haridas M, Isabelle PG, Roussos S, Augur C. Biotransformation of procyanidins by a purified fungal dioxygenase: Identification and characterization of the products using mass spectrometry. Process Biochem 2010. [DOI: 10.1016/j.procbio.2010.02.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Vinod NV, Haridas M, Sadasivan C. Isolation of 1,4-naphthalenedione, an antibacterial principle from the leaves of Holoptelea integrifolia and its activity against beta-lactam resistant Staphylococcus aureus. Indian J Biochem Biophys 2010; 47:53-55. [PMID: 21086756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Antimicrobials derived from plants have been receiving increasing attention in recent years. Antimicrobial activities of a number of phytochemicals have been reported. Many present day antibiotics are ineffective against several pathogenic organisms. About 90% of Staphylococcus aureus isolates from clinical specimens is reported to have resistance against beta-lactam antibiotics. In the present study, the effect of hexane, diethyl ether, acetone and water extracts of leaves of a medicinal plant Holoptelea integrifolia has been tested against beta-lactam resistant strain of S. aureus in presence of antibiotics such as ampicillin, amoxicillin, cefotaxime and ceftriaxone. The diethyl ether extract has shown the maximum antibacterial activity and the active principle is found to be 1,4-naphthalenedione which is characterized by GC-MS and FTIR spectroscopy. The minimum inhibitory concentration (MIC) of the compound is found to be 4 mg/ml. Structural similarity of this compound with a functional group of a beta-lactamase-resistant antibiotic indicates that 1,4-naphthlenedione may be acting as an inhibitor to beta-lactamase.
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Affiliation(s)
- N V Vinod
- Department of Biotechnology and Microbiology, Kannur University, Thalassery Campus, Palayad P O, Kerala 670 661, India
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27
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Sunilkumar PN, Nair DG, Sadasivan C, Haridas M. Disruption Mechanism in the Helix of SPF Peptide by Interchanging E5 and K10 Residues: Inference from Molecular Dynamics Study. J Biomol Struct Dyn 2009; 26:491-6. [DOI: 10.1080/07391102.2009.10507264] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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28
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Sunilkumar PN, Sadasivan C, Devaky KS, Haridas M. Conformation of an octapeptide fragment (2-9) of kaliocin-1 in DMSO-d6 by 1H NMR and restrained molecular dynamics. Indian J Biochem Biophys 2007; 44:44-9. [PMID: 17385340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Kaliocin-1, a 31-residue synthetic peptide (FFSASCVPGADKGQFPNLCRLCA GTGENKCA), which has shown the antimicrobial activity forms the 152-182 fragment of human lactoferrin (HLf). As the octapeptide FSASCVPG forms the 2-9 fragment of kaliocin-1, in the present study, its conformation in dimethyl sulfoxide-d6 (DMSO-d6) has been determined using two-dimensional (2D) nuclear magnetic resonance (NMR) spectroscopy as well as restrained molecular dynamics. Sequence specific assignments of all the 1H resonances have been carried out using 2D correlation experiments (2D DQF-COSY, TOCSY and ROESY). In dimethyl sulfoxide-d6 at 25 degrees C, the octapeptide adopts a predominantly extended backbone conformation. The calculated structure resembles closely with the reported structure of the corresponding fragment of HLf. The peptide also has sequence and structural similarity with the corresponding fragments of lactoferrins from other organisms.
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Affiliation(s)
- P N Sunilkumar
- School of Biosciences, Mahatma Gandhi University, Kottayam, Kerala, India
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29
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Sunil Kumar PN, Devaky KS, Sadasivan C, Haridas M. Conformational analysis of sea cucumber (Caudina arenicola) C globin 94-97 fragment, Pro-Glu-Leu-Leu. Protein Pept Lett 2002; 9:403-9. [PMID: 12370028 DOI: 10.2174/0929866023408526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The tetrapeptide Pro-Glu-Leu-Leu forms the 94-97 fragment of C globin in sea cucumber. 2% Butanediol dimethacrylate-cross linked polystyrene (2% BDDMA-PS), which had been optimized, was used for the synthesis of the tetrapeptide Pro-Glu-Leu-Leu. The peptide was synthesized by using Boc-amino acid strategy. The peptide purity was checked by RP-HPLC and the peptide was characterized by (1)H NMR spectroscopy and amino acid analysis. Conformation of the peptide was studied by 1D- and 2D- homonuclear (1)H NMR, in DMSO-d6 at 300K. The conformation of the synthetic tetrapeptide (extended backbone conformation) is not in agreement with that in C globin.
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Affiliation(s)
- P N Sunil Kumar
- School of Biosciences, Mahatma Gandhi University, Kottayam-686 560, Kerala, India
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Abstract
Goat milk lactoperoxidase was purified using CM-Sephadex-C-50 ion exchange chromatography and Sephadex G-100 gel filtration. The purified protein was found to have high antifungal and antibacterial activity in a thiocyanate-H2O2 medium. The results are relevant enough to suggest the exploitation of LP-thiocyanate-H2O2 system as an effective agent against many of the disease causing organisms in plants and animals.
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Affiliation(s)
- M J Benoy
- School of Biosciences, Mahatma Gandhi University, Kottayam
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31
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Jacob BM, Manoj NK, Haridas M. Antibacterial property of goat milk lactoperoxidase. Indian J Exp Biol 1998; 36:808-10. [PMID: 9838883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The goat milk lactoperoxidase was purified using CM sephadex C-50 and sephadex G 100. The purity of protein was confirmed by SDS-PAGE. The purified protein was found to have antibacterial action against most of the disease causing bacteria.
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Affiliation(s)
- B M Jacob
- School of Biosciences, Mahatma Gandhi University, Kottayam, India
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32
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Abstract
The three-dimensional structure of diferric bovine lactoferrin (bLf) has been determined by X-ray crystallography in order to investigate the factors that influence iron binding and release by transferrins. The structure was solved by molecular replacement, using the coordinates of diferric human lactoferrin (hLf) as a search model, and was refined with data to 2.8 A resolution by simulated annealing (X-PLOR) and restrained least squares (TNT). The final model comprises 5310 protein atoms (residues 5 to 689), 124 carbohydrate atoms (from ten monosaccharide units, in three glycan chains), 2 Fe3+, 2 CO32- and 50 water molecules. This model gives an R-factor of 0.232 for 21440 reflections in the resolution range 30.0 to 2.8 A. The folding of the bLf molecule is essentially the same as that of hLf, but bLf differs in the extent of closure of the two domains of each lobe, and in the relative orientations of the two lobes. Differences in domain closure are attributed to amino acid changes in the interface, and differences in lobe orientations to slightly altered packing of two hydrophobic patches between the lobes. Changed interdomain interactions may explain the lesser iron affinity of bLf, compared with hLf, and two lysine residues behind the N-lobe iron site of bLf offer new insights into the "dilysine trigger" mechanism proposed for iron release by transferrins. The bLf structure is also notable for several well-defined oligosaccharide units which demonstrate the structural factors that stabilise carbohydrate structure. One glycan chain, attached to Asn545, appears to contribute to interdomain interactions and may modulate iron release from the C-lobe.
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Affiliation(s)
- S A Moore
- Department of Biochemistry, Massey University, Palmerston North, New Zealand
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33
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Haridas M, Anderson BF, Baker EN. Structure of human diferric lactoferrin refined at 2.2 Å resolution. Acta Crystallogr D Biol Crystallogr 1995; 51:629-46. [PMID: 15299793 DOI: 10.1107/s0907444994013521] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The three-dimensional structure of the diferric form of human lactoferrin has been refined at 2.2 A resolution, using synchrotron data combined with a lower resolution (3.2 A) diffractometer data set. Following restrained least-squares refinement and model rebuilding the final model comprises 5330 protein atoms (691 residues), 2Fe(3+) and 2CO(3)(2-) ions, 469 solvent molecules and 98 carbohydrate atoms (eight sugar residues). Root-mean-square deviations from standard geometry are 0.015 A for bond lengths and 0.038 A for angle (1-3) distances, and the final crystallographic R-factor is 0.179 for all 39 113 reflections in the resolution range 8.0-2.2 A. A close structural similarity is seen between the two lobes of the molecule, with differences mainly in loops and turns. The two binding sites are extremely similar, the only apparent differences being a slightly more asymmetric bidentate binding of the carbonate ion to the metal, and a slightly longer Fe-O bond to one of the Tyr ligands, in the N-lobe site relative to the C-lobe site. Distinct differences are seen in the interactions made by two cationic groups, Arg210 and Lys546, behind the iron site, and these may influence the stability of the two metal sites. Analysis of interdomain and interlobe interactions shows that these are few in number which is consistent with the known flexibility of the molecule with respect to domain and lobe movements. Internal water molecules are found in discrete sites and in two large clusters (in the two interdomain clefts) and one tightly bound water molecule is present 3.8 A from the Fe atom in each lobe. The carbohydrate is weakly defined and has been modelled to a limited extent; two sugar residues of the N-lobe glycan and six of the C-lobe glycan. Only one direct protein-carbohydrate contact can be found.
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Affiliation(s)
- M Haridas
- Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand
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34
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Affiliation(s)
- M Haridas
- Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand
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Baker EN, Anderson BF, Baker HM, Day CL, Haridas M, Norris GE, Rumball SV, Smith CA, Thomas DH. Three-dimensional structure of lactoferrin in various functional states. Adv Exp Med Biol 1994; 357:1-12. [PMID: 7762421 DOI: 10.1007/978-1-4615-2548-6_1] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The three-dimensional structures of various forms of lactoferrin, determined by high resolution crystallographic studies, have been compared in order to determine the relationship between structure and biological function. These comparisons include human apo and diferric lactoferrins, metal and anion substituted lactoferrins, the N-terminal half molecule of human lactoferrin, and bovine diferric lactoferrin. The structures themselves define the nature and location of the iron binding sites and allow anti-bacterial and putative receptor-binding regions to be mapped on to the molecular surface. The structural comparisons show that small internal adjustments can allow the accommodation of different metals and anions without altering the overall molecular structure, whereas large-scale conformational changes are associated with metal binding and release, and smaller, but significant, movements accompany species variations. The results also focus on differences in flexibility between the two lobes, and on the importance of interactions in the inter-lobe region in modulating iron release from the N-lobe and in possibly enabling binding at one site to be signalled to the other.
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Affiliation(s)
- E N Baker
- Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand
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36
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Abstract
X-ray structure analyses of four different forms of human lactoferrin (diferric, dicupric, an oxalate-substituted dicupric, and apo-lactoferrin), and of bovine diferric lactoferrin, have revealed various ways in which the protein structure adapts to different structural and functional states. Comparison of diferric and dicupric lactoferrins has shown that different metals can, through slight variations in the metal position, have different stereochemistries and anion coordination without any significant change in the protein structure. Substitution of oxalate for carbonate, as seen in the structure of a hybrid dicupric complex with oxalate in one site and carbonate in the other, shows that larger anions can be accommodated by small side-chain movements in the binding site. The multidomain nature of lactoferrin also allows rigid body movements. Comparison of human and bovine lactoferrins, and of these with rabbit serum transferrin, shows that the relative orientations of the two lobes in each molecule can vary; these variations may contribute to differences in their binding properties. The structure of apo-lactoferrin demonstrates the importance of large-scale domain movements for metal binding and release and suggests that in solution an equilibrium exists between open and closed forms, with the open form being the active binding species. These structural forms are shown to be similar to those seen for bacterial periplasmic binding proteins, and lead to a common model for the various steps in the binding process.
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Affiliation(s)
- E N Baker
- Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand
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37
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Patel U, Haridas M, Singh TP. Structure of the 1:1 complex between 4-amino-N-(4,6-dimethyl-2-pyrimidinyl)benzenesulfonamide (sulfadimidine) and 2-hydroxybenzoic acid (salicylic acid). Acta Crystallogr C 1988. [DOI: 10.1107/s0108270188003579] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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38
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Singh TP, Haridas M, Chauhan VS, Kumar A. Crystal structure and molecular conformation of a tripeptide N-Boc- L-Phe-dehydro-Phe- L-Val-OCH 3. Acta Crystallogr A 1987. [DOI: 10.1107/s0108767387084137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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39
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Singh TP, Haridas M, Chauhan VS, Kumar A, Viterbo D. Crystal structure and molecular conformation of the tripeptide, N-Boc-L-Phe-dehydro-Phe-L-Val-OCH3. Biopolymers 1987; 26:819-29. [PMID: 3607244 DOI: 10.1002/bip.360260604] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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40
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Singh TP, Patel U, Haridas M. Structure of 2-[4-(acetylaminosulphonyl)phenylcarbamoyl]benzoic acid (phthalylsulfacetamide), C16H14N2O6S. Acta Crystallogr C 1984. [DOI: 10.1107/s010827018401074x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Haridas M, Tiwari RK, Singh TP. Structure of 4-amino-N-(4,5-dimethyl-2-oxazolyl)benzenesulphonamide (sulfamoxole), C11H13N3O3S. Acta Crystallogr C 1984. [DOI: 10.1107/s0108270184005230] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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44
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Tiwari RK, Haridas M, Singh TP. Structure of 4-amino-N-(4,6-dimethyl-2-pyrimidinyl)benzenesulphonamide (sulfadimidine), C12H14N4O2S. Acta Crystallogr C 1984. [DOI: 10.1107/s0108270184005229] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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