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Jangra M, Kaur M, Nandanwar H. In-vitro studies on a natural lantibiotic, paenibacillin: A new-generation antibacterial drug candidate to overcome multi-drug resistance. Int J Antimicrob Agents 2019; 53:838-843. [PMID: 30928682 DOI: 10.1016/j.ijantimicag.2019.03.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 03/21/2019] [Accepted: 03/25/2019] [Indexed: 11/16/2022]
Abstract
The alarming burden of antibiotic resistance in nosocomial pathogens warrants the discovery and development of new and effective antimicrobial compounds. Small cationic antimicrobial peptides seem to be a promising therapeutic alternative to fight multi-drug resistance. This study investigated the in-vitro potential of a previously reported lantibiotic, paenibacillin, from the clinical perspective. An antimicrobial peptide, M152-P4, was isolated, purified and characterized from a mud isolate, and its susceptibility was determined in clinical isolates of Staphylococcus aureus and Enterococcus spp. Time-kill kinetics, resistance, probable mode of action, haemolytic activity and mammalian cytotoxicity were investigated. M152-P4 was identified as paenibacillin based on mass spectroscopy data, amino acid analysis and biosynthetic gene cluster analysis. It had potent antibacterial activity against the Gram-positive pathogens tested, with minimum inhibitory concentrations from 0.1 to 1.56 µM. It appeared very challenging for S. aureus to develop resistance to this compound. Also, paenibacillin penetrated the outer layer of bacteria, and depolarized the membrane completely by creating pores in the plasma membrane with better potential than nisin. Paenibacillin showed no haemolysis up to 60 µM, and the half maximal inhibitory concentration on mammalian cell lines was >100 µM. These results highlight the excellent antibacterial properties of paenibacillin in clinically relevant pathogens. It is stable in the presence of serum, and non-haemolytic and non-cytotoxic even above the therapeutic concentration. Further research efforts regarding toxicity and in-vivo efficacy are necessary to develop paenibacillin as a next-generation therapeutic drug to overcome multi-drug resistance in Gram-positive pathogens.
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Affiliation(s)
- Manoj Jangra
- Clinical Microbiology and Bioactive Screening Laboratory, Council of Scientific and Industrial Research - Institute of Microbial Technology, Chandigarh, India
| | - Manpreet Kaur
- Clinical Microbiology and Bioactive Screening Laboratory, Council of Scientific and Industrial Research - Institute of Microbial Technology, Chandigarh, India
| | - Hemraj Nandanwar
- Clinical Microbiology and Bioactive Screening Laboratory, Council of Scientific and Industrial Research - Institute of Microbial Technology, Chandigarh, India.
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52
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Wang J, Song J, Yang Z, He S, Yang Y, Feng X, Dou X, Shan A. Antimicrobial Peptides with High Proteolytic Resistance for Combating Gram-Negative Bacteria. J Med Chem 2019; 62:2286-2304. [PMID: 30742437 DOI: 10.1021/acs.jmedchem.8b01348] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Poor proteolytic resistance is an urgent problem to be solved in the clinical application of antimicrobial peptides (AMPs), yet common solutions, such as complicated chemical modifications and utilization of d-amino acids, greatly increase the difficulty and cost of producing AMPs. In this work, a set of novel peptides was synthesized based on an antitrypsin/antichymotrypsin hydrolytic peptide structure unit (XYPX) n (X represents I, L, and V; Y represents R and K), which was designed using a systematic natural amino acid arrangement. Of these peptides, 16 with seven repeat units had the highest average selectivity index (GMSI = 99.07) for all of the Gram-negative bacteria tested and remained highly effective in combating Escherichia coli infection in vivo. Importantly, 16 also had dramatic resistance to a high concentration of trypsin/chymotrypsin hydrolysis and exerted bactericidal activity through a membrane-disruptive mechanism. Overall, these findings provide new approaches for the development of antiprotease hydrolytic peptides that target Gram-negative bacteria.
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Affiliation(s)
- Jiajun Wang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Jing Song
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Zhanyi Yang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Shiqi He
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Yi Yang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Xingjun Feng
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Xiujing Dou
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Anshan Shan
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
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Selectivity of Antimicrobial Peptides: A Complex Interplay of Multiple Equilibria. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1117:175-214. [DOI: 10.1007/978-981-13-3588-4_11] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Dong N, Chou S, Li J, Xue C, Li X, Cheng B, Shan A, Xu L. Short Symmetric-End Antimicrobial Peptides Centered on β-Turn Amino Acids Unit Improve Selectivity and Stability. Front Microbiol 2018; 9:2832. [PMID: 30538681 PMCID: PMC6277555 DOI: 10.3389/fmicb.2018.02832] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 11/05/2018] [Indexed: 11/13/2022] Open
Abstract
Antimicrobial peptides (AMPs) are excellent candidates to combat the increasing number of multi- or pan-resistant pathogens worldwide based on their mechanism of action, which is different from that of antibiotics. In this study, we designed short peptides by fusing an α-helix and β-turn sequence-motif in a symmetric-end template to promote the higher cell selectivity, antibacterial activity and salt-resistance of these structures. The results showed that the designed peptides PQ and PP tended to form an α-helical structure upon interacting with a membrane-mimicking environment. They displayed high cell selectivity toward bacterial cells over eukaryotic cells. Their activities were mostly maintained in the presence of different conditions (salts, serum, heat, and pH), which indicated their stability in vivo. Fluorescence spectroscopy and electron microscopy analyses indicated that PP and PQ killed bacterial cells through membrane pore formation, thereby damaging membrane integrity. This study revealed the potential application of these designed peptides as new candidate antimicrobial agents.
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Affiliation(s)
- Na Dong
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Shuli Chou
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Jiawei Li
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Chenyu Xue
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Xinran Li
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Baojing Cheng
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Anshan Shan
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Li Xu
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
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55
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Wang J, Dou X, Song J, Lyu Y, Zhu X, Xu L, Li W, Shan A. Antimicrobial peptides: Promising alternatives in the post feeding antibiotic era. Med Res Rev 2018; 39:831-859. [PMID: 30353555 DOI: 10.1002/med.21542] [Citation(s) in RCA: 312] [Impact Index Per Article: 52.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 09/11/2018] [Accepted: 09/12/2018] [Indexed: 12/15/2022]
Abstract
Antimicrobial peptides (AMPs), critical components of the innate immune system, are widely distributed throughout the animal and plant kingdoms. They can protect against a broad array of infection-causing agents, such as bacteria, fungi, parasites, viruses, and tumor cells, and also exhibit immunomodulatory activity. AMPs exert antimicrobial activities primarily through mechanisms involving membrane disruption, so they have a lower likelihood of inducing drug resistance. Extensive studies on the structure-activity relationship have revealed that net charge, hydrophobicity, and amphipathicity are the most important physicochemical and structural determinants endowing AMPs with antimicrobial potency and cell selectivity. This review summarizes the recent advances in AMPs development with respect to characteristics, structure-activity relationships, functions, antimicrobial mechanisms, expression regulation, and applications in food, medicine, and animals.
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Affiliation(s)
- Jiajun Wang
- Institute of Animal Nutrition, Department of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Xiujing Dou
- Institute of Animal Nutrition, Department of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Jing Song
- Institute of Animal Nutrition, Department of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Yinfeng Lyu
- Institute of Animal Nutrition, Department of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Xin Zhu
- Institute of Animal Nutrition, Department of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Lin Xu
- Institute of Animal Nutrition, Department of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Weizhong Li
- Institute of Animal Nutrition, Department of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Anshan Shan
- Institute of Animal Nutrition, Department of Animal Nutrition, Northeast Agricultural University, Harbin, China
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Kamaruzzaman NF, Tan LP, Mat Yazid KA, Saeed SI, Hamdan RH, Choong SS, Wong WK, Chivu A, Gibson AJ. Targeting the Bacterial Protective Armour; Challenges and Novel Strategies in the Treatment of Microbial Biofilm. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1705. [PMID: 30217006 PMCID: PMC6164881 DOI: 10.3390/ma11091705] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 09/07/2018] [Accepted: 09/09/2018] [Indexed: 02/07/2023]
Abstract
Infectious disease caused by pathogenic bacteria continues to be the primary challenge to humanity. Antimicrobial resistance and microbial biofilm formation in part, lead to treatment failures. The formation of biofilms by nosocomial pathogens such as Staphylococcus aureus (S. aureus), Pseudomonas aeruginosa (P. aeruginosa), and Klebsiella pneumoniae (K. pneumoniae) on medical devices and on the surfaces of infected sites bring additional hurdles to existing therapies. In this review, we discuss the challenges encountered by conventional treatment strategies in the clinic. We also provide updates on current on-going research related to the development of novel anti-biofilm technologies. We intend for this review to provide understanding to readers on the current problem in health-care settings and propose new ideas for new intervention strategies to reduce the burden related to microbial infections.
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Affiliation(s)
- Nor Fadhilah Kamaruzzaman
- Faculty of Veterinary Medicine, Universiti Malaysia Kelantan, Pengkalan Chepa 16100, Kelantan, Malaysia.
| | - Li Peng Tan
- Faculty of Veterinary Medicine, Universiti Malaysia Kelantan, Pengkalan Chepa 16100, Kelantan, Malaysia.
| | - Khairun Anisa Mat Yazid
- Faculty of Veterinary Medicine, Universiti Malaysia Kelantan, Pengkalan Chepa 16100, Kelantan, Malaysia.
| | - Shamsaldeen Ibrahim Saeed
- Faculty of Veterinary Medicine, Universiti Malaysia Kelantan, Pengkalan Chepa 16100, Kelantan, Malaysia.
| | - Ruhil Hayati Hamdan
- Faculty of Veterinary Medicine, Universiti Malaysia Kelantan, Pengkalan Chepa 16100, Kelantan, Malaysia.
| | - Siew Shean Choong
- Faculty of Veterinary Medicine, Universiti Malaysia Kelantan, Pengkalan Chepa 16100, Kelantan, Malaysia.
| | - Weng Kin Wong
- School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian 16150, Kelantan, Malaysia.
| | - Alexandru Chivu
- UCL Centre for Nanotechnology and Regenerative Medicine, Division of Surgery & Interventional Science, University College London, London NW3 2PF, UK.
| | - Amanda Jane Gibson
- Royal Veterinary College, Pathobiology and Population Sciences, Hawkshead Lane, North Mymms, Hatfield AL9 7TA, UK.
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Wang J, Chou S, Yang Z, Yang Y, Wang Z, Song J, Dou X, Shan A. Combating Drug-Resistant Fungi with Novel Imperfectly Amphipathic Palindromic Peptides. J Med Chem 2018; 61:3889-3907. [PMID: 29648811 DOI: 10.1021/acs.jmedchem.7b01729] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Antimicrobial peptides are an important weapon against invading pathogens and are potential candidates as novel antibacterial agents, but their antifungal activities are not fully developed. In this study, a set of imperfectly amphipathic peptides was developed based on the imperfectly amphipathic palindromic structure R n(XRXXXRX)R n ( n = 1, 2; X represents L, I, F, or W), and the engineered peptides exhibited high antimicrobial activities against all fungi and bacteria tested (including fluconazole-resistant Candida albicans), with geometric mean (GM) MICs ranging from 2.2 to 6.62 μM. Of such peptides, 13 (I6) (RRIRIIIRIRR-NH2) that was Ile rich in its hydrophobic face had the highest antifungal activity (GMfungi = 1.64 μM) while showing low toxicity and high salt and serum tolerance. It also had dramatic LPS-neutralizing propensity and a potent membrane-disruptive mechanism against microbial cells. In summary, these findings were useful for short AMPs design to combat the growing threat of drug-resistant fungal and bacterial infections.
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Affiliation(s)
- Jiajun Wang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Shuli Chou
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Zhanyi Yang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Yang Yang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Zhihua Wang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Jing Song
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Xiujing Dou
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Anshan Shan
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
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58
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MacNair CR, Stokes JM, Carfrae LA, Fiebig-Comyn AA, Coombes BK, Mulvey MR, Brown ED. Overcoming mcr-1 mediated colistin resistance with colistin in combination with other antibiotics. Nat Commun 2018; 9:458. [PMID: 29386620 PMCID: PMC5792607 DOI: 10.1038/s41467-018-02875-z] [Citation(s) in RCA: 177] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 01/04/2018] [Indexed: 12/13/2022] Open
Abstract
Plasmid-borne colistin resistance mediated by mcr-1 may contribute to the dissemination of pan-resistant Gram-negative bacteria. Here, we show that mcr-1 confers resistance to colistin-induced lysis and bacterial cell death, but provides minimal protection from the ability of colistin to disrupt the Gram-negative outer membrane. Indeed, for colistin-resistant strains of Enterobacteriaceae expressing plasmid-borne mcr-1, clinically relevant concentrations of colistin potentiate the action of antibiotics that, by themselves, are not active against Gram-negative bacteria. The result is that several antibiotics, in combination with colistin, display growth-inhibition at levels below their corresponding clinical breakpoints. Furthermore, colistin and clarithromycin combination therapy displays efficacy against mcr-1-positive Klebsiella pneumoniae in murine thigh and bacteremia infection models at clinically relevant doses. Altogether, these data suggest that the use of colistin in combination with antibiotics that are typically active against Gram-positive bacteria poses a viable therapeutic alternative for highly drug-resistant Gram-negative pathogens expressing mcr-1.
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Affiliation(s)
- Craig R MacNair
- Michael G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3ZS, Canada
| | - Jonathan M Stokes
- Michael G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3ZS, Canada
| | - Lindsey A Carfrae
- Michael G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3ZS, Canada
| | - Aline A Fiebig-Comyn
- Michael G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3ZS, Canada
| | - Brian K Coombes
- Michael G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3ZS, Canada
| | - Michael R Mulvey
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Eric D Brown
- Michael G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3ZS, Canada.
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An Optimized Synthetic-Bioinformatic Natural Product Antibiotic Sterilizes Multidrug-Resistant Acinetobacter baumannii-Infected Wounds. mSphere 2018; 3:mSphere00528-17. [PMID: 29404414 PMCID: PMC5784245 DOI: 10.1128/msphere.00528-17] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 12/19/2017] [Indexed: 01/07/2023] Open
Abstract
The antibiotic paenimucillin A was originally identified using a culture-independent synthetic-bioinformatic natural product (syn-BNP) discovery approach. Here we report on a bioinformatics-guided survey of paenimucillin A analogs that led to the discovery of paenimucillin C. Paenimucillin C inhibits the growth of multidrug-resistant (MDR) Acinetobacter baumannii clinical isolates, as well as other Gram-negative bacterial pathogens. In a rat cutaneous wound model, it completely sterilized MDR A. baumannii wound infections with no sign of rebound. Mechanistic studies point to a membrane-associated mode of action that results in leakage of intracellular contents. IMPORTANCE Natural product-inspired antibiotics have saved millions of lives and played a critical role in modern medicine. However, the emergence of drug-resistant pathogens is outpacing the rate at which new clinically useful antibiotics are being discovered. The lack of a means to combat infections caused by multidrug-resistant (MDR) Acinetobacter baumannii is of particular concern. The sharp increase in cases of MDR A. baumannii infections in recent years prompted the CDC (https://www.cdc.gov/drugresistance/biggest_threats.html) and WHO (http://www.who.int/medicines/publications/global-priority-list-antibiotic-resistant-bacteria/en/) to list this pathogen as a "serious threat" and "critical pathogen," respectively. Here we report a new antibiotic, paenimucillin C, active against Gram-negative bacterial pathogens, including many clinical isolates of MDR A. baumannii strains. Mechanistic studies point to membrane disruption leading to leakage of intracellular contents as its antibacterial mode of action. Paenimucillin C sterilizes MDR A. baumannii infections in a rat cutaneous wound model with no sign of rebound infection, providing a potential new therapeutic regimen.
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60
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Joshi S, Mumtaz S, Singh J, Pasha S, Mukhopadhyay K. Novel Miniature Membrane Active Lipopeptidomimetics against Planktonic and Biofilm Embedded Methicillin-Resistant Staphylococcus aureus. Sci Rep 2018; 8:1021. [PMID: 29348589 PMCID: PMC5773577 DOI: 10.1038/s41598-017-17234-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 11/22/2017] [Indexed: 11/09/2022] Open
Abstract
Escalating multidrug resistance and highly evolved virulence mechanisms have aggravated the clinical menace of methicillin-resistant Staphylococcus aureus (MRSA) infections. Towards development of economically viable staphylocidal agents here we report eight structurally novel tryptophan-arginine template based peptidomimetics. Out of the designed molecules, three lipopeptidomimetics (S-6, S-7 and S-8) containing 12-amino dodecanoic acid exhibited cell selectivity and good to potent activity against clinically relevant pathogens MRSA, methicillin-resistant Staphylococcus epidermidis and vancomycin-resistant Enterococcus faecium (MIC: 1.4–22.7 μg/mL). Mechanistically, the active peptidomimetics dissipated membrane potential and caused massive permeabilization on MRSA concomitant with loss of viability. Against stationary phase MRSA under nutrient-depleted conditions, active peptidomimetics S-7 and S-8 achieved > 6 log reduction in viability upon 24 h incubation while both S-7 (at 226 μg/mL) and S-8 (at 28 μg/mL) also destroyed 48 h mature MRSA biofilm causing significant decrease in viability (p < 0.05). Encouragingly, most active peptidomimetic S-8 maintained efficacy against MRSA in presence of serum/plasma while exhibiting no increase in MIC over 17 serial passages at sub-MIC concentrations implying resistance development to be less likely. Therefore, we envisage that the current template warrants further optimization towards the development of cell selective peptidomimetics for the treatment of device associated MRSA infections.
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Affiliation(s)
- Seema Joshi
- Antimicrobial Research Laboratory, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India.
| | - Sana Mumtaz
- Antimicrobial Research Laboratory, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Jyotsna Singh
- Antimicrobial Research Laboratory, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Santosh Pasha
- Peptide Research Laboratory, CSIR-Institute of Genomics and Integrative Biology, Mall Road, New Delhi, 110007, India
| | - Kasturi Mukhopadhyay
- Antimicrobial Research Laboratory, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India.
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61
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Dong N, Wang Z, Chou S, Zhang L, Shan A, Jiang J. Antibacterial activities and molecular mechanism of amino-terminal fragments from pig nematode antimicrobial peptide CP-1. Chem Biol Drug Des 2018; 91:1017-1029. [PMID: 29266746 DOI: 10.1111/cbdd.13165] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 10/18/2017] [Accepted: 12/07/2017] [Indexed: 12/20/2022]
Abstract
High manufacturing costs and weak cell selectivity have limited the clinical application of naturally occurring peptides when faced with an outbreak of drug resistance. To overcome these limitations, a set of antimicrobial peptides was synthesized with the general sequence of (WL)n, where n = 1, 2, 3, and WL was truncated from the N-terminus of Cecropin P1 without initial serine residues. The antimicrobial peptide WL3 exhibited stronger antimicrobial activity against both Gram-negative and Gram-positive microbes than the parental peptide CP-1. WL3 showed no hemolysis even at the highest test concentrations compared to the parental peptide CP-1. The condition sensitivity assays (salts, serum, and trypsin) demonstrated that WL3 had high stability in vitro. Fluorescence spectroscopy and electron microscopy indicated that WL3 killed microbes by means of penetrating the membrane and causing cell lysis. In a mouse model, WL3 was able to significantly reduce the bacteria load in major organs and cytokines (TNF-α, IL-6, and IL-1β) levels in serum. In summary, these findings suggest that WL3, which was modified from a natural antimicrobial peptide, has enormous potential for application as a novel antibacterial agent.
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Affiliation(s)
- Na Dong
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Zhihua Wang
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Shuli Chou
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Licong Zhang
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Anshan Shan
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Junguang Jiang
- The State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
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62
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Hariri BM, McMahon DB, Chen B, Adappa ND, Palmer JN, Kennedy DW, Lee RJ. Plant flavones enhance antimicrobial activity of respiratory epithelial cell secretions against Pseudomonas aeruginosa. PLoS One 2017; 12:e0185203. [PMID: 28931063 PMCID: PMC5607194 DOI: 10.1371/journal.pone.0185203] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 09/07/2017] [Indexed: 12/27/2022] Open
Abstract
Flavones are a class of natural plant secondary metabolites that have anti-inflammatory and anti-bacterial effects. Some flavones also activate the T2R14 bitter taste receptor, which is expressed in motile cilia of the sinonasal epithelium and activates innate immune nitric oxide (NO) production. Flavones may thus be potential therapeutics for respiratory infections. Our objective was to examine the anti-microbial effects of flavones on the common sinonasal pathogens Candida albicans, Staphylococcus aureus, and Pseudomonas aeruginosa, evaluating both planktonic and biofilm growth. Flavones had only very low-level antibacterial activity alone. They did not reduce biofilm formation, but did reduce production of the important P. aeruginosa inflammatory mediator and ciliotoxin pyocyanin. However, flavones exhibited synergy against P. aeruginosa in the presence of antibiotics or recombinant human lysozyme. They also enhanced the efficacy of antimicrobials secreted by cultured and primary human airway cells grown at air-liquid interface. This suggests that flavones may have anti-gram-negative potential as topical therapeutics when combined with antibiotics or in the context of innate antimicrobials secreted by the respiratory or other epithelia. This may have an additive effect when combined with T2R14-activated NO production. Additional studies are necessary to understand which flavone compounds or mixtures are the most efficacious.
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Affiliation(s)
- Benjamin M. Hariri
- Department of Otorhinolaryngology—Head and Neck Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Derek B. McMahon
- Department of Otorhinolaryngology—Head and Neck Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Bei Chen
- Department of Otorhinolaryngology—Head and Neck Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Nithin D. Adappa
- Department of Otorhinolaryngology—Head and Neck Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - James N. Palmer
- Department of Otorhinolaryngology—Head and Neck Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - David W. Kennedy
- Department of Otorhinolaryngology—Head and Neck Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Robert J. Lee
- Department of Otorhinolaryngology—Head and Neck Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Physiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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63
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Datta A, Yadav V, Ghosh A, Choi J, Bhattacharyya D, Kar RK, Ilyas H, Dutta A, An E, Mukhopadhyay J, Lee D, Sanyal K, Ramamoorthy A, Bhunia A. Mode of Action of a Designed Antimicrobial Peptide: High Potency against Cryptococcus neoformans. Biophys J 2017; 111:1724-1737. [PMID: 27760359 DOI: 10.1016/j.bpj.2016.08.032] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 08/11/2016] [Accepted: 08/29/2016] [Indexed: 12/11/2022] Open
Abstract
There is a significant need for developing compounds that kill Cryptococcus neoformans, the fungal pathogen that causes meningoencephalitis in immunocompromised individuals. Here, we report the mode of action of a designed antifungal peptide, VG16KRKP (VARGWKRKCPLFGKGG) against C. neoformans. It is shown that VG16KRKP kills fungal cells mainly through membrane compromise leading to efflux of ions and cell metabolites. Intracellular localization, inhibition of in vitro transcription, and DNA binding suggest a secondary mode of action for the peptide, hinting at possible intracellular targets. Atomistic structure of the peptide determined by NMR experiments on live C. neoformans cells reveals an amphipathic arrangement stabilized by hydrophobic interactions among A2, W5, and F12, a conventional folding pattern also known to play a major role in peptide-mediated Gram-negative bacterial killing, revealing the importance of this motif. These structural details in the context of live cell provide valuable insights into the design of potent peptides for effective treatment of human and plant fungal infections.
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Affiliation(s)
- Aritreyee Datta
- Department of Biophysics, P-1/12 CIT Scheme VII (M), Kolkata, India
| | - Vikas Yadav
- Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
| | - Anirban Ghosh
- Department of Biophysics, P-1/12 CIT Scheme VII (M), Kolkata, India
| | - Jaesun Choi
- Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul, Korea
| | | | - Rajiv K Kar
- Department of Biophysics, P-1/12 CIT Scheme VII (M), Kolkata, India
| | - Humaira Ilyas
- Department of Biophysics, P-1/12 CIT Scheme VII (M), Kolkata, India
| | | | - Eunseol An
- Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul, Korea
| | | | - Dongkuk Lee
- Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul, Korea
| | - Kaustuv Sanyal
- Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
| | | | - Anirban Bhunia
- Department of Biophysics, P-1/12 CIT Scheme VII (M), Kolkata, India.
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64
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Dou X, Zhu X, Wang J, Dong N, Shan A. Novel Design of Heptad Amphiphiles To Enhance Cell Selectivity, Salt Resistance, Antibiofilm Properties and Their Membrane-Disruptive Mechanism. J Med Chem 2017; 60:2257-2270. [PMID: 28230992 DOI: 10.1021/acs.jmedchem.6b01457] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Coiled-coil, a basic folding pattern of native proteins, was previously demonstrated to be associated with the specific spatial recognition, association, and dissociation of proteins and can be used to perfect engineering peptide model. Thus, in this study, a series of amphiphiles composed of heptads repeats with coiled-coil structures was constructed, and the designed peptides exhibited a broad spectrum of antimicrobial activities. Circular dichroism and biological assays showed that the heptad repeats and length of the linker between the heptads largely influenced the amphiphile's helical propensity and cell selectivity. The engineered amphiphiles were also found to efficiently reduce sessile P. aeruginosa biofilm biomass, neutralize endotoxins, inhibit the inflammatory response, and remain active under physiological salt concentrations. In summary, these findings are helpful for short AMP design with a highly therapeutic index to treat bacteria-induced infection.
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Affiliation(s)
- Xiujing Dou
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China
| | - Xin Zhu
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China.,College of Animal Science & Veterinary Medicine, Shenyang Agricultural University , Shenyang 110866, P. R. China
| | - Jiajun Wang
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China
| | - Na Dong
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China
| | - Anshan Shan
- Institute of Animal Nutrition, Northeast Agricultural University , Harbin 150030, P. R. China
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65
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Ma Z, Yang J, Han J, Gao L, Liu H, Lu Z, Zhao H, Bie X. Insights into the Antimicrobial Activity and Cytotoxicity of Engineered α-Helical Peptide Amphiphiles. J Med Chem 2016; 59:10946-10962. [DOI: 10.1021/acs.jmedchem.6b00922] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Zhi Ma
- Key Laboratory of Food Processing
and Quality Control, Ministry of Agriculture of China, College of
Food Science and Technology, Nanjing Agricultural University, Tongwei 6, Nanjing 210095, People’s Republic of China
| | - Jing Yang
- Key Laboratory of Food Processing
and Quality Control, Ministry of Agriculture of China, College of
Food Science and Technology, Nanjing Agricultural University, Tongwei 6, Nanjing 210095, People’s Republic of China
| | - Jinzhi Han
- Key Laboratory of Food Processing
and Quality Control, Ministry of Agriculture of China, College of
Food Science and Technology, Nanjing Agricultural University, Tongwei 6, Nanjing 210095, People’s Republic of China
| | - Ling Gao
- Key Laboratory of Food Processing
and Quality Control, Ministry of Agriculture of China, College of
Food Science and Technology, Nanjing Agricultural University, Tongwei 6, Nanjing 210095, People’s Republic of China
| | - Hongxia Liu
- Key Laboratory of Food Processing
and Quality Control, Ministry of Agriculture of China, College of
Food Science and Technology, Nanjing Agricultural University, Tongwei 6, Nanjing 210095, People’s Republic of China
| | - Zhaoxin Lu
- Key Laboratory of Food Processing
and Quality Control, Ministry of Agriculture of China, College of
Food Science and Technology, Nanjing Agricultural University, Tongwei 6, Nanjing 210095, People’s Republic of China
| | - Haizhen Zhao
- Key Laboratory of Food Processing
and Quality Control, Ministry of Agriculture of China, College of
Food Science and Technology, Nanjing Agricultural University, Tongwei 6, Nanjing 210095, People’s Republic of China
| | - Xiaomei Bie
- Key Laboratory of Food Processing
and Quality Control, Ministry of Agriculture of China, College of
Food Science and Technology, Nanjing Agricultural University, Tongwei 6, Nanjing 210095, People’s Republic of China
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66
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Cheng Y, Avula SR, Gao WW, Addla D, Tangadanchu VKR, Zhang L, Lin JM, Zhou CH. Multi-targeting exploration of new 2-aminothiazolyl quinolones: Synthesis, antimicrobial evaluation, interaction with DNA, combination with topoisomerase IV and penetrability into cells. Eur J Med Chem 2016; 124:935-945. [PMID: 27769037 DOI: 10.1016/j.ejmech.2016.10.011] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 09/20/2016] [Accepted: 10/06/2016] [Indexed: 12/14/2022]
Abstract
A series of new potentially multi-targeting antimicrobial 2-aminothiazolyl quinolones were designed, synthesized and characterized by 1H NMR, 13C NMR, IR, MS and HRMS spectra. Bioactive assay manifested that some of the prepared compounds showed moderate to good antibacterial and antifungal activities. Noticeably, compound 10f could effectively inhibit the growth of B. typhi and MRSA with MIC values of 1 and 8 μg/mL, respectively. Experimental results revealed that compound 10f was membrane-active and had the ability to rapidly kill the tested strains and effectively prevent the development of bacterial resistance. Moreover, this compound also exhibited low toxicity against L929 cells. Molecular docking indicated that compound 10f could bind with topoisomerase IV-DNA complexes through hydrogen bonds and hydrophobic interactions. Quantum chemical studies were also performed on 10f to understand the structural features essential for activity. The preliminary mechanism research suggested that compound 10f could intercalate into calf thymus DNA to form a steady supramolecular complex which might block DNA replication to exert the powerful bioactivities.
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Affiliation(s)
- Yu Cheng
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Srinivasa Rao Avula
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Wei-Wei Gao
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Dinesh Addla
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Vijai Kumar Reddy Tangadanchu
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Ling Zhang
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Jian-Mei Lin
- Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu 610072, China.
| | - Cheng-He Zhou
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
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67
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Memariani H, Shahbazzadeh D, Ranjbar R, Behdani M, Memariani M, Pooshang Bagheri K. Design and characterization of short hybrid antimicrobial peptides from pEM-2, mastoparan-VT1, and mastoparan-B. Chem Biol Drug Des 2016; 89:327-338. [PMID: 27591703 DOI: 10.1111/cbdd.12864] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Revised: 07/12/2016] [Accepted: 08/06/2016] [Indexed: 02/01/2023]
Abstract
Antimicrobial peptides are considered to be excellent templates for designing novel antibiotics because of their broad-spectrum antimicrobial activity and their low prognostic to induce antibiotic resistance. In this study, for the first time, a series of short hybrid antimicrobial peptides combined by different fragments of venom-derived alpha-helical antimicrobial peptides pEM-2, mastoparan-VT1, and mastoparan-B were designed with the intent to improve the therapeutic index of the parental peptides. Short hybrid antimicrobial peptides PV, derived from pEM-2 and mastoparan-VT1, was found to possess the highest antibacterial, hemolytic, and cytotoxic activity. Short hybrid antimicrobial peptides PV3, derived from pEM-2 and three fragments of mastoparan-VT1, showed more than threefold improvement in therapeutic index compared with parental peptides pEM-2 and mastoparan-VT1. PV had the highest antimicrobial activity in stability studies. Except BVP, designed based on all three parental peptides, the other short hybrid antimicrobial peptides at their minimal inhibitory concentration and 2× minimal inhibitory concentration required less than 120 and 60 min to reduce >3log10 the initial inoculum, respectively. All peptides had membrane-disrupting activity in a time-dependent manner. Collectively, this study highlights the potential for rational design of improved short hybrid antimicrobial peptides such as PV3 that was an ideal candidate for further assessment with the ultimate purpose of development of effective antimicrobial agents.
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Affiliation(s)
- Hamed Memariani
- Venom and Biotherapeutics Molecules Laboratory, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Delavar Shahbazzadeh
- Venom and Biotherapeutics Molecules Laboratory, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Reza Ranjbar
- Molecular Biology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Mahdi Behdani
- Venom and Biotherapeutics Molecules Laboratory, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Mojtaba Memariani
- Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Kamran Pooshang Bagheri
- Venom and Biotherapeutics Molecules Laboratory, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
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68
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Lv X, Ma Q, Zhu D, Shao C, Lv Y, Shan A. The C-terminal sequences of porcine thrombin are active as antimicrobial peptides. Chem Biol Drug Des 2016; 88:905-914. [PMID: 27439393 DOI: 10.1111/cbdd.12824] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 06/04/2016] [Accepted: 07/09/2016] [Indexed: 02/01/2023]
Abstract
The C-terminal sequences of porcine thrombin encode a series of peptides with the characteristics of net positive charge and hydrophobicity, suggesting antimicrobial potential. In this study, we synthesized truncated C-terminal peptides to explore their antimicrobial potency and structure-activity relationship. The results showed that some peptides exerted antimicrobial activity against Gram-positive and Gram-negative bacteria, with selectivity for microbial membranes. The antimicrobial potency of the peptides increased with the extension of chain length. Considering toxicity to red blood cells, the 21-mer peptide T-6 displayed the highest therapeutic index of 43.4, suggesting its higher cell selectivity. Typical α-helical conformations were observed upon binding to a bacteria-mimicking environment. The derivatives tended to interact preferentially with negatively charged vesicles compared to zwitterionic vesicles. Flow cytometry and electron microscopy revealed that the peptides targeted bacterial cell membranes and disrupted cytoplasmic membrane integrity, thereby causing the release of cellular contents leading to cell death. Peptide-membrane interaction experiments provided evidence that the peptides killed bacteria via a membrane-mediating mechanism. In summary, the C-terminal sequence of porcine thrombin has antimicrobial functions.
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Affiliation(s)
- Xiting Lv
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, P R China
| | - Qingquan Ma
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, P R China
| | - Dandan Zhu
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, P R China
| | - Changxuan Shao
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, P R China
| | - Yinfeng Lv
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, P R China
| | - Anshan Shan
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, P R China.
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69
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Siddiqi MZ, Muhammad Shafi S, Choi KD, Im WT, Aslam Z. Sphingobacterium jejuense sp. nov., with ginsenoside-converting activity, isolated from compost. Int J Syst Evol Microbiol 2016; 66:4433-4439. [PMID: 27498829 DOI: 10.1099/ijsem.0.001370] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A Gram-stain-negative, strictly aerobic, non-motile, light yellow, short-rod bacterium (designated GJ30-7T) isolated from compost, was characterized using a polyphasic approach, in order to clarify its taxonomic position. Strain GJ30-7T was observed to grow optimally at 30 °C and at pH 7.0 on R2A agar medium. Strain Gsoil GJ30-7T possessed β-glucosidase activity, which was responsible for its ability to transform ginsenosides Rb1 and Rc (the two main active components of ginseng) to ginsenoside F2. Phylogenetic analysis, based on 16S rRNA gene sequence similarities, indicated that GJ30-7T belongs to the genus Sphingobacterium of the family Sphingobacteriaceae and was most closely related to Sphingobacterium yanglingense JCM 30166T (92.6 %), Sphingobacterium psychroaquaticum KACC 18188T (92.6 %), and Sphingobacterium thermophilum KCTC 23708T (92.0 %). The DNA G+C content was 43 mol% and MK-7 was the major isoprenoid quinone. The main polar lipids were phosphatidylethanolamine, one unidentified phospolipid and one unknown polar lipid. In contrast to standard and reference strains, unidentified sphingolipid was also present. The predominant fatty acids of strain GJ30-7T were iso-C15 : 0, iso-C17 : 0 3-OH, C16 : 1ω7c and/or C16 : 1ω6c (summed feature 3) and iso-C17 : 1ω9c and/or C16 : 0 10-methyl (summed feature 9), supporting the affiliation of strain GJ30-7T to the genus Sphingobacterium. However, strain GJ30-7T could be distinguished genotypically and phenotypically from species of the genus Sphingobacterium with validly published names. The novel isolate therefore represents a novel species, for which the name Sphingobacterium jejuense sp. nov. is proposed, with the type strain GJ30-7T (=KACC 18625T=JCM 30948T).
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Affiliation(s)
- Muhammad Zubair Siddiqi
- Department of Biotechnology, Hankyong National University, 327 Chungang-no Anseong-si, Kyonggi-do 456-749, Republic of Korea
- Center for Genetic Information, Graduate School of Bio and Information Technology, Hankyong National University, 327 Chungang-no Anseong-si, Kyonggi-do 456-749, Republic of Korea
| | | | - Kang Duk Choi
- Center for Genetic Information, Graduate School of Bio and Information Technology, Hankyong National University, 327 Chungang-no Anseong-si, Kyonggi-do 456-749, Republic of Korea
- Department of Biotechnology, Hankyong National University, 327 Chungang-no Anseong-si, Kyonggi-do 456-749, Republic of Korea
| | - Wan-Taek Im
- Department of Biotechnology, Hankyong National University, 327 Chungang-no Anseong-si, Kyonggi-do 456-749, Republic of Korea
- Center for Genetic Information, Graduate School of Bio and Information Technology, Hankyong National University, 327 Chungang-no Anseong-si, Kyonggi-do 456-749, Republic of Korea
| | - Zubair Aslam
- Department of Agronomy, Faculty of Agriculture, University of Agriculture, Faisalabad-38040, Pakistan
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Datta A, Bhattacharyya D, Singh S, Ghosh A, Schmidtchen A, Malmsten M, Bhunia A. Role of Aromatic Amino Acids in Lipopolysaccharide and Membrane Interactions of Antimicrobial Peptides for Use in Plant Disease Control. J Biol Chem 2016; 291:13301-17. [PMID: 27137928 DOI: 10.1074/jbc.m116.719575] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Indexed: 01/11/2023] Open
Abstract
KYE28 (KYEITTIHNLFRKLTHRLFRRNFGYT-LR), the representative sequence of helix D of heparin co-factor II, was demonstrated to be potent against agronomically important Gram-negative plant pathogens Xanthomonas vesicatoria and Xanthomonas oryzae, capable of inhibiting disease symptoms in detached tomato leaves. NMR studies in the presence of lipopolysaccharide provided structural insights into the mechanisms underlying this, notably in relationship to outer membrane permeabilization. The three-dimensional solution structure of KYE28 in LPS is characterized by an N-terminal helical segment, an intermediate loop followed by another short helical stretch, and an extended C terminus. The two termini are in close proximity to each other via aromatic packing interactions, whereas the positively charged residues form an exterior polar shell. To further demonstrate the importance of the aromatic residues for this, a mutant peptide KYE28A, with Ala substitutions at Phe(11), Phe(19), Phe(23), and Tyr(25) was designed, which showed attenuated antimicrobial activity at high salt concentrations, as well as lower membrane disruption and LPS binding abilities compared with KYE28. In contrast to KYE28, KYE28A adopted an extended helical structure in LPS with extended N and C termini. Aromatic packing interactions were completely lost, although hydrophobic interaction between the side chains of hydrophobic residues were still partly retained, imparting an amphipathic character and explaining its residual antimicrobial activity and LPS binding as observed from ellipsometry and isothermal titration calorimetry. We thus present key structural aspects of KYE28, constituting an aromatic zipper, of potential importance for the development of novel plant protection agents and therapeutic agents.
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Affiliation(s)
- Aritreyee Datta
- From the Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata 700054, India
| | - Dipita Bhattacharyya
- From the Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata 700054, India
| | - Shalini Singh
- the Department of Pharmacy, Uppsala University, SE-75232 Uppsala, Sweden
| | - Anirban Ghosh
- From the Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata 700054, India
| | - Artur Schmidtchen
- the Department of Clinical Sciences, Division of Dermatology and Venereology, Lund University, SE-221 84 Lund, Sweden, and the Lee Kong Chian School of Medicine, Nanyang Technological University, 11 Mandalay Road, Singapore 308232
| | - Martin Malmsten
- the Department of Pharmacy, Uppsala University, SE-75232 Uppsala, Sweden,
| | - Anirban Bhunia
- From the Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata 700054, India,
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