Conformational dynamics of the bacterial E3 ligase SspH1
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Abstract
The SspH/IpaH family of novel E3 ligases are found in a number of Gram-negative bacteria and are used to target host enzymes for degradation to support pathogenesis. These E3 enzymes are autoinhibited in the absence of substrate, and different models for release of autoinhibition have been suggested. However, many of the molecular details of individual steps during the ubiquitin (Ub) transfer reaction remain unknown. Here, we present the crystal structure of Salmonella SspH1 and an analysis of the solution properties of SspH1 on its own and in complex with substrate and Ub. Our data show that SspH1 exists in a conformational equilibrium between open and closed states and that substrate binding only modulates the distribution of these states but does not induce major conformational changes. This suggests that additional mechanisms must exist to bring the substrates close to the active site to mediate transfer of Ub from the E3-Ub conjugate.
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Kennedy, C. R., McPhie, K. A., Vuorinen, A., Dudley-Fraser, J., Esposito, D., Maslen, S., McCarthy, W. J., Pettinger, J., Skehel, M. J., Bush, J. T., et al. (2025) · RSC Chemical Biology · doi:10.1039/d5cb00177c · Cited by 4 · see citing works
Self-citation
- Authors
- Kennedy, C. R., Esposito, D., Huber, J., House, D., & Rittinger, K.
- Affiliations
- The Francis Crick Institute (GB)
- GlaxoSmithKline (United Kingdom) (GB)
- Corresponding author
- Rittinger, Katrin
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2025-10
- Volume
- 301
- Issue
- 10
- Pages
- 110671
- ISSN
- 0021-9258 (ISSN-L)
- PMC
- PMC12506513
- OpenAlex
- W4413890459
- Cited by
- 1
- References
- 52
- Citations by year
- 2025: 1
- FWCI
- 0.30
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (publishedVersion, cc-by)
- Figshare (submittedVersion, cc-by)
- Funders
- The Francis Crick Institute (CC 2075)
- Biotechnology and Biological Sciences Research Council (BB/T014547/1)
- Medical Research Council
- Wellcome Trust
- Engineering and Physical Sciences Research Council (EP/V038028/1)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
- Keywords
- E3 ubiquitin ligase, Salmonella, autoinhibition, conformational equilibrium, open and closed states, substrate binding, ubiquitin transfer, crystal structure
- MeSH terms
- Bacterial Proteins, Models, Molecular, Protein Conformation, Crystallography, X-Ray, Catalytic Domain, Ubiquitin, Ubiquitin-Protein Ligases
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