Structural and dynamic insights revealing how lipase binding domain MD1 of Pseudomonas aeruginosa foldase affects lipase activation
Structural and dynamic insights revealing how lipase binding domain MD1 of Pseudomonas aeruginosa foldase affects lipase activation
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结构和动态见解揭示铜绿假单胞菌折叠酶的脂肪酶结合域 MD1 如何影响脂肪酶激活
DOI:
10.1038/s41598-020-60093-4
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发表时间:
2020
影响因子:
4.6
通讯作者:
Jaeger KE
中科院分区:
文献类型:
--
作者:
Viegas A;Dollinger P;Verma N;Kubiak J;Viennet T;Seidel CAM;Gohlke H;Etzkorn M;Kovacic F;Jaeger KE
Folding and cellular localization of many proteins of Gram-negative bacteria rely on a network of chaperones and secretion systems. Among them is the lipase-specific foldase Lif, a membrane-bound steric chaperone that tightly binds (KD= 29 nM) and mediates folding of the lipase LipA, a virulence factor of the pathogenic bacteriumP. aeruginosa. Lif consists of five-domains, including a mini domain MD1 essential for LipA folding. However, the molecular mechanism of Lif-assisted LipA folding remains elusive. Here, we show inin vitroexperiments using a soluble form of Lif (sLif) that isolated MD1 inhibitssLif-assisted LipA activation. Furthermore, the ability to activate LipA is lost in the variantsLifY99A, in which the evolutionary conserved amino acid Y99 from helix α1 of MD1 is mutated to alanine. This coincides with an approximately three-fold reduced affinity of the variant to LipA together with increased flexibility ofsLifY99Ain the complex as determined by polarization-resolved fluorescence spectroscopy. We have solved the NMR solution structures ofP. aeruginosaMD1 and variant MD1Y99Arevealing a similar fold indicating that a structural modification is likely not the reason for the impaired activity of variantsLifY99A. Molecular dynamics simulations of thesLif:LipA complex in connection with rigidity analyses suggest a long-range network of interactions spanning from Y99 ofsLif to the active site of LipA, which might be essential for LipA activation. These findings provide important details about the putative mechanism for LipA activation and point to a general mechanism of protein folding by multi-domain steric chaperones.
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DOI:
10.1007/s004380050020
发表时间:
1999
期刊:
Molecular and General Genetics MGG
影响因子:
--
作者:
M. El Khattabi;C. Ockhuijsen;W. Bitter;K. Jaeger;J. Tommassen
通讯作者:
J. Tommassen
DOI:
--
发表时间:
1995
期刊:
Journal of Biochemistry (Tokyo)
影响因子:
--
作者:
A. Hobson;C. Buckley;S. Jørgensen;B. Diderichsen;D. McConnell
通讯作者:
D. McConnell
影响因子:
3.7
作者:
Pauwels K;Sanchez del Pino MM;Feller G;Van Gelder P
通讯作者:
Van Gelder P
影响因子:
2.8
作者:
N. Nagradova
通讯作者:
N. Nagradova
DOI:
10.1073/pnas.90.8.3670
发表时间:
1993-04-15
影响因子:
11.1
作者:
DODSON, KW;JACOBDUBUISSON, F;HULTGREN, SJ
通讯作者:
HULTGREN, SJ