ClpB mutants of Francisella tularensis subspecies holarctica and tularensis are defective for type VI secretion and intracellular replication.
ClpB mutants of Francisella tularensis subspecies holarctica and tularensis are defective for type VI secretion and intracellular replication.
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DOI:
10.1038/s41598-018-29745-4
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发表时间:
2018-07-27
影响因子:
4.6
通讯作者:
Sjöstedt A
中科院分区:
文献类型:
--
作者:
Alam A;Golovliov I;Javed E;Sjöstedt A
Francisella tularensis, a highly infectious, intracellular bacterium possesses an atypical type VI secretion system (T6SS), which is essential for the virulence of the bacterium. Recent data suggest that the HSP100 family member, ClpB, is involved in T6SS disassembly in the subspecies Francisella novicida. Here, we investigated the role of ClpB for the function of the T6SS and for phenotypic characteristics of the human pathogenic subspecies holarctica and tularensis. The ∆clpB mutants of the human live vaccine strain, LVS, belonging to subspecies holarctica, and the highly virulent SCHU S4 strain, belonging to subspecies tularensis, both showed extreme susceptibility to heat shock and low pH, severely impaired type VI secretion (T6S), and significant, but impaired intracellular replication compared to the wild-type strains. Moreover, they showed essentially intact phagosomal escape. Infection of mice demonstrated that both ΔclpB mutants were highly attenuated, but the SCHU S4 mutant showed more effective replication than the LVS strain. Collectively, our data demonstrate that ClpB performs multiple functions in the F. tularensis subspecies holarctica and tularensis and its function is important for T6S, intracellular replication, and virulence.
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DOI:
10.1074/jbc.m114.600510
发表时间:
2014-11-21
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Förster A;Planamente S;Manoli E;Lossi NS;Freemont PS;Filloux A
通讯作者:
Filloux A
影响因子:
64.5
作者:
Clemens DL;Ge P;Lee BY;Horwitz MA;Zhou ZH
通讯作者:
Zhou ZH
影响因子:
3.1
作者:
Broms, Jeanette E.;Lavander, Moa;Sjostedt, Anders
通讯作者:
Sjostedt, Anders
影响因子:
3.4
作者:
Aschtgen, Marie-Stephanie;Zoued, Abdelrahim;Lloubes, Roland;Journet, Laure;Cascales, Eric
通讯作者:
Cascales, Eric
影响因子:
5.2
作者:
Bröms JE;Meyer L;Sjöstedt A
通讯作者:
Sjöstedt A