The location of NuoL and NuoM subunits in the membrane domain of the Escherichia coli Complex I: implications for the mechanism of proton pumping

P. Holt, D. Morgan, L.A. Sazanov, Journal of Biological Chemistry 278 (2003) 43114–43120.

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Abstract
The molecular organization of bacterial NADH: ubiquinone oxidoreductase (complex I or NDH-1) is not established, apart from a rough separation into dehydrogenase, connecting and membrane domains. In this work, complex I was purified from Escherichia coli and fragmented by replacing dodecylmaltoside with other detergents. Exchange into decyl maltoside led to the removal of the hydrophobic subunit NuoL from the otherwise intact complex. Diheptanoyl phosphocholine led to the loss of NuoL and NuoM subunits, whereas other subunits remained in the complex. The presence of N,N-dimethyldodecylamine N-oxide or Triton X-100 led to further disruption of the membrane domain into fragments containing NuoL/M/N, NuoA/K/N, and NuoH/J subunits. Among the hydrophilic subunits, NuoCD was most readily dissociated from the complex, whereas NuoB was partially dissociated from the peripheral arm assembly in N,N-dimethyldodecylamine N-oxide. A model of subunit arrangement in bacterial complex I based on these data is proposed. Subunits NuoL and NuoM, which are homologous to antiporters and are implicated in proton pumping, are located at the distal end of the membrane arm, spatially separated from the redox centers of the peripheral arm. This is consistent with proposals that the mechanism of proton pumping by complex I is likely to involve long range conformational changes.
Publishing Year
Date Published
2003-10-31
Journal Title
Journal of Biological Chemistry
Acknowledgement
his work was supported by the Medical Research Council.
Volume
278
Issue
44
Page
43114 - 43120
IST-REx-ID

Cite this

Holt P, Morgan D, Sazanov LA. The location of NuoL and NuoM subunits in the membrane domain of the Escherichia coli Complex I: implications for the mechanism of proton pumping. Journal of Biological Chemistry. 2003;278(44):43114-43120. doi:10.1074/jbc.M308247200
Holt, P., Morgan, D., & Sazanov, L. A. (2003). The location of NuoL and NuoM subunits in the membrane domain of the Escherichia coli Complex I: implications for the mechanism of proton pumping. Journal of Biological Chemistry, 278(44), 43114–43120. https://doi.org/10.1074/jbc.M308247200
Holt, Peter, David Morgan, and Leonid A Sazanov. “The Location of NuoL and NuoM Subunits in the Membrane Domain of the Escherichia Coli Complex I: Implications for the Mechanism of Proton Pumping.” Journal of Biological Chemistry 278, no. 44 (2003): 43114–20. https://doi.org/10.1074/jbc.M308247200.
P. Holt, D. Morgan, and L. A. Sazanov, “The location of NuoL and NuoM subunits in the membrane domain of the Escherichia coli Complex I: implications for the mechanism of proton pumping,” Journal of Biological Chemistry, vol. 278, no. 44, pp. 43114–43120, 2003.
Holt P, Morgan D, Sazanov LA. 2003. The location of NuoL and NuoM subunits in the membrane domain of the Escherichia coli Complex I: implications for the mechanism of proton pumping. Journal of Biological Chemistry. 278(44), 43114–43120.
Holt, Peter, et al. “The Location of NuoL and NuoM Subunits in the Membrane Domain of the Escherichia Coli Complex I: Implications for the Mechanism of Proton Pumping.” Journal of Biological Chemistry, vol. 278, no. 44, American Society for Biochemistry and Molecular Biology, 2003, pp. 43114–20, doi:10.1074/jbc.M308247200.

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