Source 1primary paper2020Bulletin of the Chemical Society of Japan
Toolkit/light-induced difference FTIR spectroscopy
light-induced difference FTIR spectroscopy
Also known as: difference FTIR spectroscopy, Fourier-transform infrared (FTIR) spectroscopy
Taxonomy: Technique Branch / Method. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Light-induced difference Fourier-transform infrared (FTIR) spectroscopy is a powerful, sensitive and informative method for studying protein structural changes in photoreceptive proteins.
Usefulness & Problems
Why this is useful
This method measures light-induced difference FTIR spectra to study structural changes in photoreceptive proteins. In the abstract it is used to analyze rhodopsins and flavin-binding photoreceptors.; studying protein structural changes in photoreceptive proteins; resolving detailed structural information on single protein-bound water molecules when water content is controlled; molecular characterization of photoreceptive proteins and new rhodopsins
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This method measures light-induced difference FTIR spectra to study structural changes in photoreceptive proteins. In the abstract it is used to analyze rhodopsins and flavin-binding photoreceptors.
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studying protein structural changes in photoreceptive proteins
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resolving detailed structural information on single protein-bound water molecules when water content is controlled
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molecular characterization of photoreceptive proteins and new rhodopsins
Problem solved
It addresses the need for sensitive structural characterization of light-responsive proteins, including protein-bound water and hydrogen-bonding changes. The method is presented as a way to connect light absorption to molecular function.; provides structural readout of light-induced changes in photoreceptive proteins; enables analysis of hydrogen-bonding and water-related structural features in photoreceptive proteins
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It addresses the need for sensitive structural characterization of light-responsive proteins, including protein-bound water and hydrogen-bonding changes. The method is presented as a way to connect light absorption to molecular function.
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provides structural readout of light-induced changes in photoreceptive proteins
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enables analysis of hydrogen-bonding and water-related structural features in photoreceptive proteins
Problem links
enables analysis of hydrogen-bonding and water-related structural features in photoreceptive proteins
LiteratureIt addresses the need for sensitive structural characterization of light-responsive proteins, including protein-bound water and hydrogen-bonding changes. The method is presented as a way to connect light absorption to molecular function.
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It addresses the need for sensitive structural characterization of light-responsive proteins, including protein-bound water and hydrogen-bonding changes. The method is presented as a way to connect light absorption to molecular function.
provides structural readout of light-induced changes in photoreceptive proteins
LiteratureIt addresses the need for sensitive structural characterization of light-responsive proteins, including protein-bound water and hydrogen-bonding changes. The method is presented as a way to connect light absorption to molecular function.
Source:
It addresses the need for sensitive structural characterization of light-responsive proteins, including protein-bound water and hydrogen-bonding changes. The method is presented as a way to connect light absorption to molecular function.
Taxonomy & Function
Primary hierarchy
Technique Branch
Method: A concrete measurement method used to characterize an engineered system.
Mechanisms
detection of hydrogen-bonding changesdetection of photoadduct formationlight-induced difference spectroscopyTarget processes
No target processes tagged yet.
Input: Light
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationimplementation constraint: spectral hardware requirementoperating role: sensor
The abstract indicates that controlled sample water content and optimized hydrated-film measuring conditions are required. It also implies an FTIR measurement setup capable of recording difference spectra across multiple IR regions.; water content in the sample must be controlled during measurements; optimized measuring conditions for hydrated film samples are required for high accuracy
The abstract notes that water absorption in the IR region is a persistent issue, so the method is constrained by sample hydration handling. It does not claim to remove that limitation entirely.; strong absorption of water in the IR region is an issue
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
FTIR spectroscopy elucidated adduct formation in the LOV domain, hydrogen-bonding alteration in the BLUF domain, and activation and DNA-repair mechanisms in photolyases.
Comprehensive FTIR analyses revealed that proton-pumping rhodopsins possess strongly hydrogen-bonded water molecules, and a strongly hydrogen-bonded water molecule was concluded to be the functional determinant of a proton pump.
Light-induced difference FTIR spectroscopy is a powerful, sensitive, and informative method for studying protein structural changes in photoreceptive proteins.
When sample water content is controlled, light-induced difference FTIR spectroscopy can provide detailed structural information on a single protein-bound water molecule.
Optimized measuring conditions for hydrated film samples enabled highly accurate difference FTIR spectra for bacteriorhodopsin in both the 1800–800 cm−1 and 4000–1800 cm−1 regions.
spectral region 1800–800 cm−1spectral region 4000–1800 cm−1
Approval Evidence
1 source5 linked approval claimsfirst-pass slug light-induced-difference-ftir-spectroscopy
Light-induced difference Fourier-transform infrared (FTIR) spectroscopy is a powerful, sensitive and informative method for studying protein structural changes in photoreceptive proteins.
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mechanistic applicationsupports
FTIR spectroscopy elucidated adduct formation in the LOV domain, hydrogen-bonding alteration in the BLUF domain, and activation and DNA-repair mechanisms in photolyases.
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mechanistic conclusionsupports
Comprehensive FTIR analyses revealed that proton-pumping rhodopsins possess strongly hydrogen-bonded water molecules, and a strongly hydrogen-bonded water molecule was concluded to be the functional determinant of a proton pump.
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method capabilitysupports
Light-induced difference FTIR spectroscopy is a powerful, sensitive, and informative method for studying protein structural changes in photoreceptive proteins.
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method constraint and resolutionsupports
When sample water content is controlled, light-induced difference FTIR spectroscopy can provide detailed structural information on a single protein-bound water molecule.
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method optimization resultsupports
Optimized measuring conditions for hydrated film samples enabled highly accurate difference FTIR spectra for bacteriorhodopsin in both the 1800–800 cm−1 and 4000–1800 cm−1 regions.
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Comparisons
Source-stated alternatives
No direct alternative structural methods are named in the provided abstract.
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No direct alternative structural methods are named in the provided abstract.
Source-backed strengths
described as powerful, sensitive, and informative; can yield highly accurate difference spectra under optimized hydrated-film conditions; can access both conventional 1800–800 cm−1 and 4000–1800 cm−1 spectral regions
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described as powerful, sensitive, and informative
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can yield highly accurate difference spectra under optimized hydrated-film conditions
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can access both conventional 1800–800 cm−1 and 4000–1800 cm−1 spectral regions
Compared with CLARITY technology
light-induced difference FTIR spectroscopy and CLARITY technology address a similar problem space.
Shared frame: same top-level item type; same primary input modality: light
Compared with Langendorff perfused heart electrical recordings
light-induced difference FTIR spectroscopy and Langendorff perfused heart electrical recordings address a similar problem space.
Shared frame: same top-level item type; same primary input modality: light
Compared with native green gel system
light-induced difference FTIR spectroscopy and native green gel system address a similar problem space.
Shared frame: same top-level item type; same primary input modality: light
Ranked Citations
- 1.