Quantitative description of a contractile macromolecular machine.
Quantitative description of a contractile macromolecular machine.
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DOI:
10.1126/sciadv.abf9601
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发表时间:
2021-06
期刊:
影响因子:
13.6
通讯作者:
Leiman PG
中科院分区:
文献类型:
--
作者:
Fraser A;Prokhorov NS;Jiao F;Pettitt BM;Scheuring S;Leiman PG
Contractile injection systems generate 500 pN forces for membrane puncture by a domino-like collapse of sheath subunits. Contractile injection systems (CISs) [type VI secretion system (T6SS), phage tails, and tailocins] use a contractile sheath-rigid tube machinery to breach cell walls and lipid membranes. The structures of the pre- and postcontraction states of several CISs are known, but the mechanism of contraction remains poorly understood. Combining structural information of the end states of the 12-megadalton R-type pyocin sheath-tube complex with thermodynamic and force spectroscopy analyses and an original modeling procedure, we describe the mechanism of pyocin contraction. We show that this nanomachine has an activation energy of 160 kilocalories/mole (kcal/mol), and it releases 2160 kcal/mol of heat and develops a force greater than 500 piconewtons. Our combined approach provides a quantitative and experimental description of the membrane penetration process by a CIS.
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影响因子:
3.6
作者:
BLOMFIELD, IC;VAUGHN, V;EISENSTEIN, BI
通讯作者:
EISENSTEIN, BI
影响因子:
64.8
作者:
Ge P;Scholl D;Prokhorov NS;Avaylon J;Shneider MM;Browning C;Buth SA;Plattner M;Chakraborty U;Ding K;Leiman PG;Miller JF;Zhou ZH
通讯作者:
Zhou ZH
DOI:
10.1073/pnas.211400898
发表时间:
2001-10-23
影响因子:
11.1
作者:
Ando, T;Kodera, N;Toda, A
通讯作者:
Toda, A
影响因子:
3.4
作者:
CASPAR, DLD
通讯作者:
CASPAR, DLD
影响因子:
2.4
作者:
Cordero, RR;Roth, P
通讯作者:
Roth, P