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Applied Microbiology and Biotechnology

, Volume 97, Issue 5, pp 1941–1952 | Cite as

Characterization of a S-layer protein from Lactobacillus crispatus K313 and the domains responsible for binding to cell wall and adherence to collagen

  • Zhilan Sun
  • Jian KongEmail author
  • Shumin Hu
  • Wentao Kong
  • Wenwei Lu
  • Wei Liu
Biotechnologically relevant enzymes and proteins

Abstract

It was previously shown that the surface (S)-layer proteins covering the cell surface of Lactobacillus crispatus K313 were involved in the adherence of this strain to human intestinal cell line HT-29. To further elucidate the structures and functions of S-layers, three putative S-layer protein genes (slpA, slpB, and slpC) of L. crispatus K313 were amplified by PCR, sequenced, and characterized in detail. Quantitative real-time PCR analysis reveals that slpA was silent under the tested conditions; whereas slpB and slpC, the putative amino acid sequences which exhibited minor similarities to the previously reported S-layer proteins in L. crispatus, were actively expressed. slpB, which was predominantly expressed in L. crispatus K313, was further investigated for its functional domains. Genetic truncation of the untranslated leader sequence (UTLS) of slpB results in a reduction in protein production, indicating that the UTLS contributed to the efficient S-layer protein expression. By producing a set of N- and C-terminally truncated recombinant SlpB proteins in Escherichia coli, the cell wall-binding region was mapped to the C terminus, where rSlpB380–501 was sufficient for binding to isolated cell wall fragments. Moreover, the binding ability of the C terminus was variable among the Lactobacillus species (S-layer- and non-S-layer-producing strains), and teichoic acid may be acting as the receptor of SlpB. To determine the adhesion region of SlpB to extracellular matrix proteins, ELISA was performed. Binding to immobilized types I and IV collagen was observed with the His-SlpB1–379 peptides, suggesting that the extracellular matrix protein-binding domain was located in the N terminus.

Keywords

Lactobacillus crispatus S-layer·cell wall fragments Extracellular matrix protein Enzyme-linked immunosorbent assay 

Notes

Acknowledgments

We would like to thank M. van de Guchte and S. Hazebrouck for their generous gifts of L. delbrueckii subsp. bulgaricus ATCC 11842 and L. casei BL23, respectively. This research was supported by the National Natural Science Foundation of China (31070091), and the 863 Hi-Tech Research and Development Program of China (2011AA100902).

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Zhilan Sun
    • 1
  • Jian Kong
    • 1
    Email author
  • Shumin Hu
    • 1
    • 2
  • Wentao Kong
    • 1
  • Wenwei Lu
    • 1
  • Wei Liu
    • 1
  1. 1.State Key Laboratory of Microbial TechnologyShandong UniversityJinanPeople’s Republic of China
  2. 2.Scientific Research CenterTsingtao Brewery Co.LTDQingdaoPeople’s Republic of China

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