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| Hauptseite > Publikationsdatenbank > Sensor Histidine Kinase NarQ Activates via Helical Rotation, Diagonal Scissoring, and Eventually Piston-Like Shifts > print |
| Hauptseite > Publikationsdatenbank > Sensor Histidine Kinase NarQ Activates via Helical Rotation, Diagonal Scissoring, and Eventually Piston-Like Shifts > print |
| 001 | 875097 | ||
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| 100 | 1 | _ | |a Gushchin, Ivan |0 P:(DE-Juel1)165798 |b 0 |
| 245 | _ | _ | |a Sensor Histidine Kinase NarQ Activates via Helical Rotation, Diagonal Scissoring, and Eventually Piston-Like Shifts |
| 260 | _ | _ | |a Basel |c 2020 |b Molecular Diversity Preservation International |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Membrane-embedded sensor histidine kinases (HKs) and chemoreceptors are used ubiquitously by bacteria and archaea to percept the environment, and are often crucial for their survival and pathogenicity. The proteins can transmit the signal from the sensor domain to the catalytic kinase domain reliably over the span of several hundreds of angstroms, and regulate the activity of the cognate response regulator proteins, with which they form two-component signaling systems (TCSs). Several mechanisms of transmembrane signal transduction in TCS receptors have been proposed, dubbed (swinging) piston, helical rotation, and diagonal scissoring. Yet, despite decades of studies, there is no consensus on whether these mechanisms are common for all TCS receptors. Here, we extend our previous work on Escherichia coli nitrate/nitrite sensor kinase NarQ. We determined a crystallographic structure of the sensor-TM-HAMP fragment of the R50S mutant, which, unexpectedly, was found in a ligand-bound-like conformation, despite an inability to bind nitrate. Subsequently, we reanalyzed the structures of the ligand-free and ligand-bound NarQ and NarX sensor domains, and conducted extensive molecular dynamics simulations of ligand-free and ligand-bound wild type and mutated NarQ. Based on the data, we show that binding of nitrate to NarQ causes, first and foremost, helical rotation and diagonal scissoring of the α-helices at the core of the sensor domain. These conformational changes are accompanied by a subtle piston-like motion, which is amplified by a switch in the secondary structure of the linker between the sensor and TM domains. We conclude that helical rotation, diagonal scissoring, and piston are simply different degrees of freedom in coiled-coil proteins and are not mutually exclusive in NarQ, and likely in other nitrate sensors and TCS proteins as well. |
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| 700 | 1 | _ | |a Orekhov, Philipp |0 0000-0003-4078-4762 |b 1 |
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| 700 | 1 | _ | |a Gordeliy, Valentin |0 P:(DE-Juel1)131964 |b 5 |e Corresponding author |
| 773 | _ | _ | |a 10.3390/ijms21093110 |g Vol. 21, no. 9, p. 3110 - |0 PERI:(DE-600)2019364-6 |n 9 |p 3110 - |t International journal of molecular sciences |v 21 |y 2020 |x 1422-0067 |
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