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Exploring lectin-like activity of the S-layer protein of Lactobacillus acidophilus ATCC 4356

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Abstract

The surface layer (S-layer) protein of Lactobacillus acidophilus is a crystalline array of self-assembling, proteinaceous subunits non-covalently bound to the outmost bacterial cell wall envelope and is involved in the adherence of bacteria to host cells. We have previously described that the S-layer protein of L. acidophilus possesses anti-viral and anti-bacterial properties. In this work, we extracted and purified S-layer proteins from L. acidophilus ATCC 4356 cells to study their interaction with cell wall components from prokaryotic (i.e., peptidoglycan and lipoteichoic acids) and eukaryotic origin (i.e., mucin and chitin), as well as with viruses, bacteria, yeast, and blood cells. Using chimeric S-layer fused to green fluorescent protein (GFP) from different parts of the protein, we analyzed their binding capacity. Our results show that the C-terminal part of the S-layer protein presents lectin-like activity, interacting with different glycoepitopes. We further demonstrate that lipoteichoic acid (LTA) serves as an anchor for the S-layer protein. Finally, a structure for the C-terminal part of S-layer and possible binding sites were predicted by a homology-based model.

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Acknowledgments

We are very grateful to Carmen Sanchez-Rivas for the helpful discussions.

Funding

This work was supported by grants from the Universidad de Buenos Aires and the CONICET Argentina to SMR. JFM is a graduate fellow of CONICET.

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Correspondence to Sandra M. Ruzal.

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The authors declare that they have no competing interests.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Fina Martin, J., Palomino, M.M., Cutine, A.M. et al. Exploring lectin-like activity of the S-layer protein of Lactobacillus acidophilus ATCC 4356. Appl Microbiol Biotechnol 103, 4839–4857 (2019). https://doi.org/10.1007/s00253-019-09795-y

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  • DOI: https://doi.org/10.1007/s00253-019-09795-y

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