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Koller TO, Morici M, Berger M, Safdari HA, Lele DS, Beckert B, Kaur KJ, Wilson DN. Structural basis for translation inhibition by the glycosylated drosocin peptide. Nat Chem Biol 2023; 19:1072-1081. [PMID: 36997646 PMCID: PMC10449632 DOI: 10.1038/s41589-023-01293-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 02/14/2023] [Indexed: 04/07/2023]
Abstract
The proline-rich antimicrobial peptide (PrAMP) drosocin is produced by Drosophila species to combat bacterial infection. Unlike many PrAMPs, drosocin is O-glycosylated at threonine 11, a post-translation modification that enhances its antimicrobial activity. Here we demonstrate that the O-glycosylation not only influences cellular uptake of the peptide but also interacts with its intracellular target, the ribosome. Cryogenic electron microscopy structures of glycosylated drosocin on the ribosome at 2.0-2.8-Å resolution reveal that the peptide interferes with translation termination by binding within the polypeptide exit tunnel and trapping RF1 on the ribosome, reminiscent of that reported for the PrAMP apidaecin. The glycosylation of drosocin enables multiple interactions with U2609 of the 23S rRNA, leading to conformational changes that break the canonical base pair with A752. Collectively, our study reveals novel molecular insights into the interaction of O-glycosylated drosocin with the ribosome, which provide a structural basis for future development of this class of antimicrobials.
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Affiliation(s)
- Timm O Koller
- Institute for Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany
| | - Martino Morici
- Institute for Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany
| | - Max Berger
- Institute for Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany
| | - Haaris A Safdari
- Institute for Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany
| | - Deepti S Lele
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Bertrand Beckert
- Dubochet Center for Imaging (DCI) at EPFL, EPFL SB IPHYS DCI, Lausanne, Switzerland
| | - Kanwal J Kaur
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Daniel N Wilson
- Institute for Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany.
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Welch NG, Li W, Hossain MA, Separovic F, O'Brien-Simpson NM, Wade JD. (Re)Defining the Proline-Rich Antimicrobial Peptide Family and the Identification of Putative New Members. Front Chem 2020; 8:607769. [PMID: 33335890 PMCID: PMC7736402 DOI: 10.3389/fchem.2020.607769] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 11/11/2020] [Indexed: 01/10/2023] Open
Abstract
As we rapidly approach a post-antibiotic era in which multi-drug resistant bacteria are ever-pervasive, antimicrobial peptides (AMPs) represent a promising class of compounds to help address this global issue. AMPs are best-known for their membrane-disruptive mode of action leading to bacteria cell lysis and death. However, many AMPs are also known to be non-lytic and have intracellular modes of action. Proline-rich AMPs (PrAMPs) are one such class, that are generally membrane permeable and inhibit protein synthesis leading to a bactericidal outcome. PrAMPs are highly effective against Gram-negative bacteria and yet show very low toxicity against eukaryotic cells. Here, we review both the PrAMP family and the past and current definitions for this class of peptides. Computational analysis of known AMPs within the DRAMP database (http://dramp.cpu-bioinfor.org/) and assessment of their PrAMP-like properties have led us to develop a revised definition of the PrAMP class. As a result, we subsequently identified a number of unknown and unclassified peptides containing motifs of striking similarity to known PrAMP-based DnaK inhibitors and propose a series of new sequences for experimental evaluation and subsequent addition to the PrAMP family.
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Affiliation(s)
- Nicholas G Welch
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, VIC, Australia.,School of Chemistry, University of Melbourne, Melbourne, VIC, Australia
| | - Wenyi Li
- Centre for Oral Health Research, Melbourne Dental School, University of Melbourne, Melbourne, VIC, Australia.,Bio21 Institute, University of Melbourne, Melbourne, VIC, Australia
| | - Mohammed Akhter Hossain
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, VIC, Australia.,School of Chemistry, University of Melbourne, Melbourne, VIC, Australia
| | - Frances Separovic
- School of Chemistry, University of Melbourne, Melbourne, VIC, Australia.,Bio21 Institute, University of Melbourne, Melbourne, VIC, Australia
| | - Neil M O'Brien-Simpson
- Centre for Oral Health Research, Melbourne Dental School, University of Melbourne, Melbourne, VIC, Australia.,Bio21 Institute, University of Melbourne, Melbourne, VIC, Australia
| | - John D Wade
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, VIC, Australia.,School of Chemistry, University of Melbourne, Melbourne, VIC, Australia
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3
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Lele DS, Dwivedi R, Kumari S, Kaur KJ. Effect of distal sugar and interglycosidic linkage of disaccharides on the activity of proline rich antimicrobial glycopeptides. J Pept Sci 2015; 21:833-44. [DOI: 10.1002/psc.2826] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 08/08/2015] [Accepted: 09/03/2015] [Indexed: 12/14/2022]
Affiliation(s)
- Deepti S. Lele
- Structural Biology Unit; National Institute of Immunology; Aruna Asaf Ali Marg New Delhi 110 067 India
| | - Rohini Dwivedi
- Structural Biology Unit; National Institute of Immunology; Aruna Asaf Ali Marg New Delhi 110 067 India
| | - Saroj Kumari
- Structural Biology Unit; National Institute of Immunology; Aruna Asaf Ali Marg New Delhi 110 067 India
| | - Kanwal J. Kaur
- Structural Biology Unit; National Institute of Immunology; Aruna Asaf Ali Marg New Delhi 110 067 India
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Lele DS, Talat S, Kumari S, Srivastava N, Kaur KJ. Understanding the importance of glycosylated threonine and stereospecific action of Drosocin, a Proline rich antimicrobial peptide. Eur J Med Chem 2015; 92:637-47. [DOI: 10.1016/j.ejmech.2015.01.032] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 12/08/2014] [Accepted: 01/15/2015] [Indexed: 10/24/2022]
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