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Walklett AJ, Flack EKP, Chidwick HS, Hatton NE, Keenan T, Budhadev D, Walton J, Thomas GH, Fascione MA. The Retaining Pse5Ac7Ac Pseudaminyltransferase KpsS1 Defines a Previously Unreported glycosyltransferase family (GT118). Angew Chem Int Ed Engl 2024; 63:e202318523. [PMID: 38224120 DOI: 10.1002/anie.202318523] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 01/16/2024]
Abstract
Cell surface sugar 5,7-diacetyl pseudaminic acid (Pse5Ac7Ac) is a bacterial analogue of the ubiquitous sialic acid, Neu5Ac, and contributes to the virulence of a number of multidrug resistant bacteria, including ESKAPE pathogens Pseudomonas aeruginosa, and Acinetobacter baumannii. Despite its discovery in the surface glycans of bacteria over thirty years ago, to date no glycosyltransferase enzymes (GTs) dedicated to the synthesis of a pseudaminic acid glycosidic linkage have been unequivocally characterised in vitro. Herein we demonstrate that A. baumannii KpsS1 is a dedicated pseudaminyltransferase enzyme (PseT) which constructs a Pse5Ac7Ac-α(2,6)-Glcp linkage, and proceeds with retention of anomeric configuration. We utilise this PseT activity in tandem with the biosynthetic enzymes required for CMP-Pse5Ac7Ac assembly, in a two-pot, seven enzyme synthesis of an α-linked Pse5Ac7Ac glycoside. Due to its unique activity and protein sequence, we also assign KpsS1 as the prototypical member of a previously unreported GT family (GT118).
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Affiliation(s)
| | - Emily K P Flack
- Department of Chemistry, University of York, York, YO10 5DD, UK
- Department of Biology, University of York, York, YO10 5DD, UK
| | | | | | - Tessa Keenan
- Department of Chemistry, University of York, York, YO10 5DD, UK
| | | | - Julia Walton
- Department of Chemistry, University of York, York, YO10 5DD, UK
| | - Gavin H Thomas
- Department of Biology, University of York, York, YO10 5DD, UK
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Keenan T, Chidwick HS, Best M, Flack EKP, Yates NDJ, Hatton NE, Warnes ME, Fascione MA. Co-factor prosthesis facilitates biosynthesis of azido-pseudaminic acid probes for use as glycosyltransferase reporters. Chem Commun (Camb) 2024; 60:1428-1431. [PMID: 38205715 DOI: 10.1039/d3cc05924c] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
Truncated thioester N,S-diacetylcysteamine (SNAc) was utilised as a co-factor mimic for PseH, an acetyl-coA dependent aminoglycoside N-acetyltransferase, in the biosynthesis of the bacterial sugar, pseudaminic acid. Additionally, an azido-SNAc analogue was used to smuggle N7-azide functionality into the pseudaminic acid backbone, facilitating its use as a reporter of pseudaminyltransferase activity.
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Affiliation(s)
- Tessa Keenan
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Harriet S Chidwick
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Matthew Best
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Emily K P Flack
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
- Department of Biology, University of York, York, YO10 5DD, UK
| | - Nicholas D J Yates
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Natasha E Hatton
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Matthew E Warnes
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Martin A Fascione
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
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Tufail A, Akkad S, Hatton NE, Yates NDJ, Spears RJ, Keenan T, Parkin A, Signoret N, Fascione MA. Cross aldol OPAL bioconjugation outcompetes intramolecular hemiaminal cyclisation of proline adjacent N-terminal α-oxo aldehydes at acidic pH. RSC Adv 2024; 14:3723-3729. [PMID: 38268544 PMCID: PMC10806391 DOI: 10.1039/d3ra08776j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 01/12/2024] [Indexed: 01/26/2024] Open
Abstract
Novel methods to construct small molecule-protein bioconjugates are integral to the development of new biomedicines for a variety of diseases. C-C linked bioconjugates are increasingly desirable in this application due to their in vivo stability and can be accessed through cross aldol bioconjugation of reactive α-oxo aldehyde handles easily introduced at the N-terminus of proteins by periodate oxidation. We previously developed an organocatalyst-mediated protein aldol ligation (OPAL) for chemical modification of these reactive aldehydes, but the efficiency of this method was limited when a proline residue was directly adjacent to the N-terminus due to intramolecular hemiaminal formation. Herein we explore the competition between this cyclisation and the OPAL modification and demonstrate bioconjugation can be favoured through use of acidic pH for both oxidation and OPAL, and optimisation of reaction conditions and organocatalyst. We then showcase the utility of this acidic-OPAL in modification of the cholera toxin B-subunit (CTB), a homo-pentameric protein of biomedical promise.
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Affiliation(s)
- Afzaal Tufail
- Department of Chemistry, University of York Heslington York YO10 5DD UK
- Hull York Medical School, University of York YO10 5DD UK
| | - Saeed Akkad
- Department of Chemistry, University of York Heslington York YO10 5DD UK
| | - Natasha E Hatton
- Department of Chemistry, University of York Heslington York YO10 5DD UK
| | | | - Richard J Spears
- Department of Chemistry, University of York Heslington York YO10 5DD UK
| | - Tessa Keenan
- Department of Chemistry, University of York Heslington York YO10 5DD UK
| | - Alison Parkin
- Department of Chemistry, University of York Heslington York YO10 5DD UK
| | | | - Martin A Fascione
- Department of Chemistry, University of York Heslington York YO10 5DD UK
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Keenan T, Hatton NE, Porter J, Vendeville JB, Wheatley DE, Ghirardello M, Wahart AJC, Ahmadipour S, Walton J, Galan MC, Linclau B, Miller GJ, Fascione MA. Reverse thiophosphorylase activity of a glycoside phosphorylase in the synthesis of an unnatural Manβ1,4GlcNAc library. Chem Sci 2023; 14:11638-11646. [PMID: 37920340 PMCID: PMC10619541 DOI: 10.1039/d3sc04169g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 09/28/2023] [Indexed: 11/04/2023] Open
Abstract
β-Mannosides are ubiquitous in nature, with diverse roles in many biological processes. Notably, Manβ1,4GlcNAc a constituent of the core N-glycan in eukaryotes was recently identified as an immune activator, highlighting its potential for use in immunotherapy. Despite their biological significance, the synthesis of β-mannosidic linkages remains one of the major challenges in glycoscience. Here we present a chemoenzymatic strategy that affords a series of novel unnatural Manβ1,4GlcNAc analogues using the β-1,4-d-mannosyl-N-acetyl-d-glucosamine phosphorylase, BT1033. We show that the presence of fluorine in the GlcNAc acceptor facilitates the formation of longer β-mannan-like glycans. We also pioneer a "reverse thiophosphorylase" enzymatic activity, favouring the synthesis of longer glycans by catalysing the formation of a phosphorolysis-stable thioglycoside linkage, an approach that may be generally applicable to other phosphorylases.
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Affiliation(s)
- Tessa Keenan
- Department of Chemistry, University of York Heslington York YO10 5DD UK
| | - Natasha E Hatton
- Department of Chemistry, University of York Heslington York YO10 5DD UK
| | - Jack Porter
- School of Chemical and Physical Sciences and Centre for Glycosciences, Keele University Keele, Staffordshire ST5 5BG UK
| | | | - David E Wheatley
- School of Chemistry, University of Southampton Highfield Southampton SO17 1BJ UK
| | - Mattia Ghirardello
- School of Chemistry, University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Alice J C Wahart
- School of Chemical and Physical Sciences and Centre for Glycosciences, Keele University Keele, Staffordshire ST5 5BG UK
| | - Sanaz Ahmadipour
- School of Chemical and Physical Sciences and Centre for Glycosciences, Keele University Keele, Staffordshire ST5 5BG UK
| | - Julia Walton
- Department of Chemistry, University of York Heslington York YO10 5DD UK
| | - M Carmen Galan
- School of Chemistry, University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Bruno Linclau
- School of Chemistry, University of Southampton Highfield Southampton SO17 1BJ UK
- Department of Organic and Macromolecular Chemistry, Ghent University Campus Sterre, Krijgslaan 281-S4 Ghent 9000 Belgium
| | - Gavin J Miller
- School of Chemical and Physical Sciences and Centre for Glycosciences, Keele University Keele, Staffordshire ST5 5BG UK
| | - Martin A Fascione
- Department of Chemistry, University of York Heslington York YO10 5DD UK
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Yates NDJ, Hatton NE, Fascione MA, Parkin A. Site-Selective Aryl Diazonium Installation onto Protein Surfaces at Neutral pH using a Maleimide-Functionalized Triazabutadiene. Chembiochem 2023; 24:e202300313. [PMID: 37311168 DOI: 10.1002/cbic.202300313] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 04/20/2023] [Revised: 06/01/2023] [Accepted: 06/08/2023] [Indexed: 06/15/2023]
Abstract
Aryl diazonium cations are versatile bioconjugation reagents due to their reactivity towards electron-rich aryl residues and secondary amines, but historically their usage has been hampered by both their short lifespan in aqueous solution and the harsh conditions required to generate them in situ. Triazabutadienes address many of these issues as they are stable enough to endure multiple-step chemical syntheses and can persist for several hours in aqueous solution, yet upon UV-exposure rapidly release aryl diazonium cations under biologically-relevant conditions. This paper describes the synthesis of a novel maleimide-functionalized triazabutadiene suitable for site-selectively installing aryl diazonium cations into proteins at neutral pH; we show reaction with this molecule and a surface-cysteine of a thiol disulfide oxidoreductase. Through photoactivation of the site-selectively installed triazabutadiene motifs, we generate aryl diazonium functionality, which we further derivatize via azo-bond formation to electron-rich aryl species, showcasing the potential utility of this strategy for the generation of photoswitches or protein-drug conjugates.
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Affiliation(s)
- Nicholas D J Yates
- Department of Chemistry, University of York Heslington, York, YO10 5DD, UK
| | - Natasha E Hatton
- Department of Chemistry, University of York Heslington, York, YO10 5DD, UK
| | - Martin A Fascione
- Department of Chemistry, University of York Heslington, York, YO10 5DD, UK
| | - Alison Parkin
- Department of Chemistry, University of York Heslington, York, YO10 5DD, UK
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Keenan T, Spears RJ, Akkad S, Mahon CS, Hatton NE, Walton J, Noble A, Yates ND, Baumann CG, Parkin A, Signoret N, Fascione MA. A Tale of Two Bioconjugations: pH Controlled Divergent Reactivity of Protein α-oxo-Aldehydes in Competing α-oxo-Mannich and Catalyst-Free Aldol Ligations. ACS Chem Biol 2021; 16:2387-2400. [PMID: 34751550 DOI: 10.1021/acschembio.1c00531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Site-selective chemical methods for protein bioconjugation have revolutionized the fields of cell and chemical biology through the development of novel protein/enzyme probes bearing fluorescent, spectroscopic, or even toxic cargos. Herein, we report two new methods for the bioconjugation of α-oxo aldehyde handles within proteins using small molecule aniline and/or phenol probes. The "α-oxo-Mannich" and "catalyst-free aldol" ligations both compete for the electrophilic α-oxo aldehyde, which displays pH divergent reactivity proceeding through the "Mannich" pathway at acidic pH to afford bifunctionalized bioconjugates, and the "catalyst-free aldol" pathway at neutral pH to afford monofunctionalized bioconjugates. We explore the substrate scope and utility of both of these bioconjugations in the construction of neoglycoproteins, in the process formulating a mechanistic rationale for how both pathways intersect with each other at different reaction pH's.
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Affiliation(s)
- Tessa Keenan
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
| | - Richard J. Spears
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
| | - Saeed Akkad
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
| | - Clare S. Mahon
- Department of Chemistry, Durham University, Durham, United Kingdom DH1 3LE
| | - Natasha E. Hatton
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
| | - Julia Walton
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
| | - Amanda Noble
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
| | - Nicholas D. Yates
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
| | | | - Alison Parkin
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
| | - Nathalie Signoret
- Hull York Medical School, University of York, York, United Kingdom YO10 5DD
| | - Martin A. Fascione
- Department of Chemistry, University of York, York, United Kingdom YO10 5DD
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Hatton NE, Baumann CG, Fascione MA. Developments in Mannose-Based Treatments for Uropathogenic Escherichia coli-Induced Urinary Tract Infections. Chembiochem 2021; 22:613-629. [PMID: 32876368 PMCID: PMC7894189 DOI: 10.1002/cbic.202000406] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/28/2020] [Indexed: 12/16/2022]
Abstract
During their lifetime almost half of women will experience a symptomatic urinary tract infection (UTI) with a further half experiencing a relapse within six months. Currently UTIs are treated with antibiotics, but increasing antibiotic resistance rates highlight the need for new treatments. Uropathogenic Escherichia coli (UPEC) is responsible for the majority of symptomatic UTI cases and thus has become a key pathological target. Adhesion of type one pilus subunit FimH at the surface of UPEC strains to mannose-saturated oligosaccharides located on the urothelium is critical to pathogenesis. Since the identification of FimH as a therapeutic target in the late 1980s, a substantial body of research has been generated focusing on the development of FimH-targeting mannose-based anti-adhesion therapies. In this review we will discuss the design of different classes of these mannose-based compounds and their utility and potential as UPEC therapeutics.
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Affiliation(s)
- Natasha E. Hatton
- York Structural Biology Lab, Department of ChemistryUniversity of YorkHeslington RoadYorkYO10 5DDUK
| | | | - Martin A. Fascione
- York Structural Biology Lab, Department of ChemistryUniversity of YorkHeslington RoadYorkYO10 5DDUK
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