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Image Search Results
Journal: Communications Biology
Article Title: A second photoactivatable state of the anion-conducting channelrhodopsin Gt ACR1 empowers persistent activity
doi: 10.1038/s42003-025-08560-4
Figure Lengend Snippet: a Gt ACR1 amplitude spectra of the reaction after the first flash (black) and the second flash (red). Shown are the reactions from L 2 to M (1st flash T 4 = 44 ms, 2nd flash T 4 = 88 ms), from M to N/O (1st flash T 5 = 150 ms, 2nd flash T 5 = 1438 ms) and from N/O to ground state (1st flash T 6 = 16 s, 2nd flash T 6 = 93 s). Due to the low amplitude of the T 6 spectra and the spectra after the second flash, they have been amplified as indicated. b , c Time course of Gt ACR1 marker absorption bands after one flash ( b ) and after the second flash ( c ). The time-resolved data were obtained from rapid-scan FTIR difference spectroscopic measurements. The band assignment is based on the work by Dreier et al. assigning the 1644 cm −1 band (light blue) to conformational changes during channel opening and closing in the amide I region, the 1691 cm −1 band (magenta) to channel opening and therefore the conducting state, the 1184 cm −1 band (black) to protonated 13- cis retinal and the 1529 cm −1 band (blue) to the retinal C=C vibrations in the ground state. d Gt ACR1 amplitude spectra at T 6 of the reaction after one flash (black, t 1/2 = 16 s), two flashes (gray, t 1/2 = 93 s), and five flashes (red, t 1/2 = 69 s). Spectra were scaled to the 1531 cm −1 marker band for all- trans retinal. A reduction in the amplitude of the band at 1708 cm −1 and an amplification in the amplitude at 1691 cm −1 can be observed. e Gt ACR1 amplitude spectra at T 6 of the reaction after one flash (black, t 1/2 = 16 s) and 30 s of continuous illumination (red, t 1/2 = 68 s). Spectra were scaled to the 1531 cm −1 marker band for all- trans retinal. A reduction in the amplitude of the bands at 1708 cm −1 and 1691 cm −1 can be observed. f Gt ACR1 amplitude spectra at T 6 of the reaction after one flash (black, t 1/2 = 16 s), two flashes (gray, t 1/2 = 93 s), and five flashes (red, t 1/2 = 69 s). Spectra were scaled to the 1184 cm −1 marker band for protonated 13- cis retinal. A shift towards 1176 cm −1 can be observed with a growing number of flashes. g Gt ACR1 amplitude spectra at T 6 of the reaction after one flash (black, t 1/2 = 16 s) and 30 s of continuous illumination (red, t 1/2 = 68 s). Spectra were scaled to the 1184 cm −1 marker band for protonated 13- cis retinal. A shift towards 1179 cm −1 can be observed.
Article Snippet: Measurements were performed in the
Techniques: Amplification, Marker
Journal: Communications Biology
Article Title: A second photoactivatable state of the anion-conducting channelrhodopsin Gt ACR1 empowers persistent activity
doi: 10.1038/s42003-025-08560-4
Figure Lengend Snippet: a , b Time course of Gt ACR1 marker absorption bands in the Gt ACR1 WT and the variant Q46E. The time-resolved data were obtained from rapid-scan FTIR difference spectroscopic measurements. The band assignment is based on the work by Dreier et al. assigning the 1644 cm −1 band (light blue) to conformational changes during channel opening and closing in the amide I region, the 1691 cm −1 band (pink) to channel opening and therefore the conducting state, the 1184 cm −1 band (black) to protonated 13- cis retinal and the 1529 cm −1 band (orange) to the retinal C=C vibrations in the ground state. c Comparison of the amplitude spectra from Gt ACR1 WT (black) and Gt ACR1 Q46E (red). Shown are the reactions from L 2 to M (WT T 4 = 43.7 ms, Q46E T 4 = 291.74 ms), from M to N/O (WT T 5 = 149.95 ms, Q46E T 5 = 1145.42 ms) and from N/O to ground state (WT T 6 = 15.9 s, Q46E T 6 = 32.66 s). Due to the low amplitude of some spectra, they have been amplified as indicated. An enlarged extract of the Gt ACR1 amplitude spectra at T 6 of the reaction of Gt ACR1 WT and Gt ACR1 Q46E is displayed, showing no absorption of a syn -marker band at 1154 cm −1 in either the WT or the variant, and the shift from 1184 cm −1 towards 1180 cm −1 in the variant.
Article Snippet: Measurements were performed in the
Techniques: Marker, Variant Assay, Comparison, Amplification