The RickA protein of Rickettsia conorii activates the Arp2/3 complex View Full Text


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Article Info

DATE

2004-01

AUTHORS

Edith Gouin, Coumaran Egile, Pierre Dehoux, Véronique Villiers, Josephine Adams, Frank Gertler, Rong Li, Pascale Cossart

ABSTRACT

Actin polymerization, the main driving force for cell locomotion, is also used by the bacteria Listeria and Shigella and vaccinia virus for intracellular and intercellular movements. Seminal studies have shown the key function of the Arp2/3 complex in nucleating actin and generating a branched array of actin filaments during membrane extension and pathogen movement. Arp2/3 requires activation by proteins such as the WASP-family proteins or ActA of Listeria. We previously reported that actin tails of Rickettsia conorii, another intracellular bacterium, unlike those of Listeria, Shigella or vaccinia, are made of long unbranched actin filaments apparently devoid of Arp2/3 (ref. 4). Here we identify a R. conorii surface protein, RickA, that activates Arp2/3 in vitro, although less efficiently than ActA. In infected cells, Arp2/3 is detected on the rickettsial surface but not in actin tails. When expressed in mammalian cells and targeted to the membrane, RickA induces filopodia. Thus RickA-induced actin polymerization, by generating long actin filaments reminiscent of those present in filopodia, has potential as a tool for studying filopodia formation. More... »

PAGES

457

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nature02318

DOI

http://dx.doi.org/10.1038/nature02318

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1046541318

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/14749835


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