期刊
MOLECULAR MICROBIOLOGY
卷 42, 期 3, 页码 689-703出版社
WILEY
DOI: 10.1046/j.1365-2958.2001.02676.x
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资金
- NHLBI NIH HHS [HL59561, HL03749] Funding Source: Medline
- NIAID NIH HHS [5T32 AI107422, R01-AI23538] Funding Source: Medline
- NIDDK NIH HHS [P30DK34928] Funding Source: Medline
Efficient uptake of Yersinia pseudotuberculosis into cultured mammalian cells is the result of high-affinity binding of invasin to beta (1) chain integrins. We demonstrate here that uptake requires Rac1 and Arp 2/3 function. Bacterial uptake was stimulated by GTP gammaS, but was inhibited in mammalian cells transfected with the interfering Rac1-N17 derivative. Rac1 was found to be activated in response to integrin engagement by invasin, whereas Rac1 and Arp 2/3 were found to be intensely localized around phagosomes bearing bacteria, indicating a specific role for Rac1 signalling from the nascent phagosome to downstream effectors. To determine whether the Arp 2/3 complex was a component of this proposed pathway, cells overproducing various derivatives of Scar1/WAVE1, an Arp 2/3-binding protein, were analysed. Sequestration of Arp 2/3 away from the phagocytic cup as a result of Scar1/WAVE1 overproduction dramatically inhibited uptake. To determine whether signalling from Rac1 to Arp 2/3 occurred via N-WASP, uptake was analysed in a cell line lacking expression of WASP and N-WASP. Uptake was unaffected by the absence of these proteins, indicating that beta (1) integrin signalling from Rac1 to Arp 2/3 can occur in the absence of N-WASP function.
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