Skip to content

Research at St Andrews

Covalent host-targeting by thioester domains of Gram-positive pathogens

Research output: Contribution to journalArticlepeer-review

Author(s)

Miriam Walden, John Edwards, Aleksandra Dziewulska, Uli Schwarz-Linek, Mark Banfield

School/Research organisations

Abstract

Gram-positive pathogens are a major concern to global health, with increasing resistance to antimicrobials and the lack of preventative therapeutics. Understanding how these bacteria interact with host cells is vital for the development of novel strategies to combat disease. One of the most crucial steps in infection is adhesion to the host cell. The discovery of complex cell-surface associated proteins, such as pili, has advanced our knowledge of this interaction, however the precise molecular mechanisms underlying this process remain unclear. Structural studies of pili revealed the presence of highly unusual intramolecular covalent bonds between amino acid side chains. These include isopeptide bonds between Lys and Asp/Asn residues, conferring mechanical strength, thermal stability and resistance to proteases [1,2]. In Streptococcus pyogenes pili, the adhesin Spy0125 (or Cpa) interacts with the host cell. It comprises three domains, two of which contain stabilising isopeptide bonds [2,3]. Intriguingly, the third domain contains an extremely rare thioester bond, between a Cys and a Gln residue. A Cys to Ala mutation results in a 75% reduction in adhesion, suggesting that this internal linkage may mediate direct attachment [3]. We have now discovered putative thioester domains (TEDs) in cell-surface proteins of several clinically important pathogens. The only other example of an internal thioester is found in complement proteins, where the reactive bond enables the formation of covalent attachment to pathogens. The presence of these bonds in bacterial proteins suggests the possibility of an as-yet uncharacterised, conserved mechanism of covalent host cell attachment. For a selection of pathogens, we have used mass spectrometry and crystallography to confirm the presence of the covalent link between the Cys and Gln residues within the TEDs. Furthermore, we have identified putative host cell targets of TEDs and confirmed covalent linkages between the TED and the target.
Close

Details

Original languageUndefined/Unknown
Pages (from-to)C848
JournalActa Crystallographica Section A: Foundations and Advances
Volume70
Issue numbera1
DOIs
Publication statusPublished - 1 Aug 2014

    Research areas

  • Thioester bond, Adhesion, Pili

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Insights into the mechanism of the cyanobactin heterocyclase enzyme

    Ge, Y., Czekster, C. M., Miller, O. K., Botting, C. H., Schwarz-Linek, U. & Naismith, J. H., 23 Apr 2019, In: Biochemistry. 58, 16, p. 2125-2132 8 p.

    Research output: Contribution to journalArticlepeer-review

  2. Oxidation of the cyanobactin precursor peptide is independent of the leader peptide and operates in a defined order

    Gao, S., Ge, Y., Bent, A. F., Schwarz-Linek, U. & Naismith, J. H., 16 Oct 2018, In: Biochemistry. 57, 41, p. 5996-6002 7 p.

    Research output: Contribution to journalArticlepeer-review

  3. A new structural class of bacterial thioester domains reveals a slipknot topology

    Miller, O. K., Banfield, M. & Schwarz-Linek, U., Sep 2018, In: Protein Science. 27, 9, p. 1651-1660

    Research output: Contribution to journalArticlepeer-review

  4. A new method for post-translationally labeling proteins in live cells for fluorescence imaging and tracking

    Hinrichsen, M., Lenz, M., Edwards, J. M., Miller, O. K., Mochrie, S. G. J., Swain, P. S., Schwarz-Linek, U. & Regan, L., Dec 2017, In: Protein Engineering, Design & Selection. 30, 12, p. 771-780

    Research output: Contribution to journalArticlepeer-review

  5. Rift Valley fever phlebovirus NSs protein core domain structure suggests molecular basis for nuclear filaments

    Barski, M., Brennan, B., Miller, O. K., Potter, J. A., Vijayakrishnan, S., Bhella, D., Naismith, J. H., Elliott, R. M. & Schwarz-Linek, U., 15 Sep 2017, In: eLife. 6, 20 p., e29236.

    Research output: Contribution to journalArticlepeer-review

Related by journal

  1. Gating MscS: Structural basis of mechanosensation and the role of lipids in ion channel regulation

    Pliotas, C., Dahl, A. C., Rasmussen, T., Mahendran, K. R., Smith, T. K., Marius, P., Gault, J., Rasmussen, A., Robinson, C. V., Bayley, H., Sansom, M. S., Booth, I. R. & Naismith, J. H., Sep 2016, In: Acta Crystallographica Section A: Foundations and Advances. A72, s35

    Research output: Contribution to journalAbstractpeer-review

ID: 242923658

Top