A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation

Tegtmeyer N, Hartig R, Delahay RM, Rohde M, Brandt S, Conradi J, Takahashi S, Smolka AJ, Sewald N, Backert S (2010)
Journal of Biological Chemistry 285(30): 23515-23526.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Tegtmeyer, Nicole; Hartig, Roland; Delahay, Robin M.; Rohde, Manfred; Brandt, Sabine; Conradi, JensUniBi; Takahashi, Seiichiro; Smolka, Adam J.; Sewald, NorbertUniBi ; Backert, Steffen
Abstract / Bemerkung
Fibronectin, a 250-kDa eukaryotic extracellular matrix protein containing an RGD motif plays crucial roles in cell-cell communication, development, tissue homeostasis, and disease development. The highly complex fibrillar fibronectin meshwork orchestrates the functions of other extracellular matrix proteins, promoting cell adhesion, migration, and intracellular signaling. Here, we demonstrate that CagL, a 26-kDa protein of the gastric pathogen and type I carcinogen Helicobacter pylori, mimics fibronectin in various cellular functions. Like fibronectin, CagL contains a RGD motif and is located on the surface of the bacterial type IV secretion pili as previously shown. CagL binds to the integrin receptor alpha(5)beta(1) and mediates the injection of virulence factors into host target cells. We show that purified CagL alone can directly trigger intracellular signaling pathways upon contact with mammalian cells and can complement the spreading defect of fibronectin(-/-) knock-out cells in vitro. During interaction with various human and mouse cell lines, CagL mimics fibronectin in triggering cell spreading, focal adhesion formation, and activation of several tyrosine kinases in an RGD-dependent manner. Among the activated factors are the nonreceptor tyrosine kinases focal adhesion kinase and Src but also the epidermal growth factor receptor and epidermal growth factor receptor family member Her3/ErbB3. Interestingly, fibronectin activates a similar range of tyrosine kinases but not Her3/ErbB3. These findings suggest that the bacterial protein CagL not only exhibits functional mimicry with fibronectin but is also capable of activating fibronectin-independent signaling events. We thus postulate that CagL may contribute directly to H. pylori pathogenesis by promoting aberrant signaling crosstalk within host cells.
Journal of Biological Chemistry
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Tegtmeyer N, Hartig R, Delahay RM, et al. A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation. Journal of Biological Chemistry. 2010;285(30):23515-23526.
Tegtmeyer, N., Hartig, R., Delahay, R. M., Rohde, M., Brandt, S., Conradi, J., Takahashi, S., et al. (2010). A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation. Journal of Biological Chemistry, 285(30), 23515-23526. https://doi.org/10.1074/jbc.M109.096214
Tegtmeyer, Nicole, Hartig, Roland, Delahay, Robin M., Rohde, Manfred, Brandt, Sabine, Conradi, Jens, Takahashi, Seiichiro, Smolka, Adam J., Sewald, Norbert, and Backert, Steffen. 2010. “A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation”. Journal of Biological Chemistry 285 (30): 23515-23526.
Tegtmeyer, N., Hartig, R., Delahay, R. M., Rohde, M., Brandt, S., Conradi, J., Takahashi, S., Smolka, A. J., Sewald, N., and Backert, S. (2010). A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation. Journal of Biological Chemistry 285, 23515-23526.
Tegtmeyer, N., et al., 2010. A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation. Journal of Biological Chemistry, 285(30), p 23515-23526.
N. Tegtmeyer, et al., “A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation”, Journal of Biological Chemistry, vol. 285, 2010, pp. 23515-23526.
Tegtmeyer, N., Hartig, R., Delahay, R.M., Rohde, M., Brandt, S., Conradi, J., Takahashi, S., Smolka, A.J., Sewald, N., Backert, S.: A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation. Journal of Biological Chemistry. 285, 23515-23526 (2010).
Tegtmeyer, Nicole, Hartig, Roland, Delahay, Robin M., Rohde, Manfred, Brandt, Sabine, Conradi, Jens, Takahashi, Seiichiro, Smolka, Adam J., Sewald, Norbert, and Backert, Steffen. “A Small Fibronectin-mimicking Protein from Bacteria Induces Cell Spreading and Focal Adhesion Formation”. Journal of Biological Chemistry 285.30 (2010): 23515-23526.

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