Virulent Burkholderia species mimic host actin polymerases to drive actin-based motility.

Virulent Burkholderia species mimic host actin polymerases to drive actin-based motility.
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DOI:
10.1016/j.cell.2015.02.044
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发表时间:
2015-04-09
期刊:
影响因子:
64.5
通讯作者:
Welch MD
Welch MD
中科院分区:
生物学1区
文献类型:
--
作者:
Benanti EL;Nguyen CM;Welch MD

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Burkholderia pseudomallei and B. mallei are bacterial pathogens that cause melioidosis and glanders, while their close relative B. thailandensis is nonpathogenic. All use the trimeric autotransporter BimA to facilitate actin-based motility, host cell fusion and dissemination. Here, we show that BimA orthologs mimic different host actin-polymerizing proteins. B. thailandensis BimA activates the host Arp2/3 complex. In contrast, B. pseudomallei and B. mallei BimA mimic host Ena/VASP actin polymerases in their ability to nucleate, elongate and bundle filaments by associating with barbed ends, as well as in their use of WH2 motifs and oligomerization for activity. Mechanistic differences among BimA orthologs resulted in distinct actin filament organization and motility parameters, which affected the efficiency of cell fusion during infection. Our results identify bacterial Ena/VASP mimics and reveal that pathogens imitate the full spectrum of host actin-polymerizing pathways, suggesting that mimicry of different polymerization mechanisms influences key parameters of infection.
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