ArticleThe Journal of biological chemistry2013
Harmonic analysis of the fluorescence response of bimane adducts of colicin E1 at helices 6, 7, and 10.
Article in The Journal of biological chemistry, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed.
- Analyzing Transmembrane Protein and Hydrophobic Helix Topography by Dual Fluorescence Quenching.Methods in molecular biology (Clifton, N.J.) · 2026Article
- Fluorescent Probes and Quenchers in Studies of Protein Folding and Protein-Lipid Interactions.Chemical record (New York, N.Y.) · 2024Review
- Cholesterol modulates the structural dynamics of the paddle motif loop of KvAP voltage sensor.Current research in structural biology · 2024Article
- Measuring Membrane Penetration Depths and Conformational Changes in Membrane Peptides and Proteins.The Journal of membrane biology · 2022Review
- Site-directed fluorescence approaches to monitor the structural dynamics of proteins using intrinsic Trp and labeled with extrinsic fluorophores.STAR protocols · 2022Article
- Gating-related Structural Dynamics of the MgtE Magnesium Channel in Membrane-Mimetics Utilizing Site-Directed Tryptophan Fluorescence.Journal of molecular biology · 2021Article
- Structural Dynamics of the Paddle Motif Loop in the Activated Conformation of KvAP Voltage Sensor.Biophysical journal · 2020Article
- Site-Directed Fluorescence Approaches for Dynamic Structural Biology of Membrane Peptides and Proteins.Frontiers in molecular biosciences · 2019Review
- Distance mapping in proteins using fluorescence spectroscopy: tyrosine, like tryptophan, quenches bimane fluorescence in a distance-dependent manner.Biochemistry · 2014Article
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3 authors.
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Abstract
The pre-channel state of helices 6, 7, and 10 (Val(447)-Gly(475) and Ile(508)-Ile(522)) of colicin E1 was investigated by a site-directed fluorescence labeling technique. A total of 44 cysteine variants were purified and covalently labeled with monobromobimane fluorescent probe. A variety of fluorescence properties of the bimane fluorophore were measured for both the soluble and membrane-bound states of the channel peptide, including the fluorescence emission maximum, fluorescence anisotropy, and membrane bilayer penetration depth. Using site-directed fluorescence labeling combined with our novel helical periodicity analysis method, the data revealed that helices 6, 7, and 10 are separate amphipathic α-helices with a calculated periodicity of T = 3.34 ± 0.08 for helix 6, T = 3.56 ± 0.03 for helix 7, and T = 2.99 ± 0.12 for helix 10 in the soluble state. In the membrane-bound state, the helical periodicity was determined to be T = 3.00 ± 0.15 for helix 6, T = 3.68 ± 0.03 for helix 7, and T = 3.47 ± 0.04 for helix 10. Dual fluorescence quencher analysis showed that both helices 6 and 7 adopt a tilted topology that correlates well with the analysis based on the fluorescence anisotropy profile. These data provide further support for the umbrella model of the colicin E1 channel domain.
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