Microbial rhodopsins are presented as a family of type 1 rhodopsins that function as ion pumps, sensors, and channels within a shared seven-helix transmembrane scaffold. The review frames them as the molecular basis for later optogenetic applications.
First-pass extracted concept
microbial rhodopsins
Candidate: concept label9 source documents25 linked claims
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Aliases
membrane-embedded photoreceptive retinylidene proteins, retinal proteins, rhodopsins, type 1 rhodopsins
Extracted Explainers
What the tool is doing
Microbial rhodopsins are described as retinal-containing photoreceptive proteins that support light-driven energy and sensory transduction processes. The review frames them as a broad and diverse family rather than a single discrete tool.
Microbial rhodopsins are presented as diverse retinal-binding proteins that can transport ions passively or actively. The review identifies them as the main optogenetic tools for excitation and silencing.
Microbial rhodopsins are presented as membrane-embedded photoreceptive proteins whose functions can be converted and engineered. The review links them to mechanistic studies and optogenetic use.
Microbial rhodopsins are presented as a diverse family of photoactive retinylidene proteins with shared scaffold features and varied light-driven functions. The review uses this family as the umbrella context for optogenetic applications.
Microbial rhodopsins are presented as a rich family of light-responsive proteins whose photocycles and spectra can be exploited for multiphoton optical control.
Resources required
The abstract states that these proteins carry a retinal prosthetic group. No additional execution requirements are given in the provided source text.
The abstract explicitly states that these proteins contain a retinal chromophore. No additional cofactors or deployment requirements are given in the provided evidence.
The abstract ties microbial rhodopsins to all-trans retinal and seven-transmembrane-helix protein environments.
Use of these proteins requires working with membrane-embedded rhodopsin systems and light-based functional readouts. The abstract does not specify expression hosts or assay formats.
Use depends on proteins with characterized photocycles and optical access to the relevant wavelengths and timing patterns.
What problem it solves
As a family label, this concept organizes diverse light-responsive membrane proteins whose function and structure can be elucidated for application development. It links basic molecular biology to optogenetic use.
At the family level, they enable organisms to couple light input to energy transduction or sensory signaling. The abstract does not narrow this to a specific engineering use case.
They solve the need for genetically encoded light-responsive actuators that can drive or suppress neural activity through ion transport.
They provide a biological scaffold for controlling activities with light and for studying light-induced protein mechanisms.
As a concept label, it helps frame the source's scope around light-responsive membrane proteins used for energy transduction, sensory transduction, and optogenetics.
They provide a diverse and engineerable substrate for building optogenetic sensing and control systems with multiple accessible states.
What it does not solve
The abstract does not identify a single discrete construct or method that solves a specific engineering bottleneck. It also does not specify which subclass is best for a given application.
The abstract does not specify which subclasses are best for particular applications or what limitations apply in engineered settings.
The abstract does not specify which microbial rhodopsin variants best address expression, targeting, or in vivo deployment constraints.
The abstract does not establish that all microbial rhodopsins are directly usable as optogenetic tools without further engineering.
Alternatives
The abstract does not name alternative non-rhodopsin optogenetic systems. It contrasts functional subclasses within microbial rhodopsins rather than external alternatives.
The provided evidence does not discuss alternative photoreceptive protein families.
Animal rhodopsins are contrasted as GPCR-type rhodopsins with different functional logic.
No explicit alternative photoreceptive tool families are named in the provided source text.
The supplied text does not discuss alternative non-rhodopsin optogenetic families.
The abstract mentions light-responsive proteins and small molecules more broadly, but highlights microbial rhodopsins as especially suitable.
Evidence Snippets
In this review, we provide brief information on the types of molecular tools for optogenetic and thermogenetic methods─microbial rhodopsins and proteins of the TRP superfamily─and also consider their applications in the field of activation of non-neuronal tissues and mammalian cells.
As the optogenetic tool protein, microbial rhodopsins have been continuously explored, modified, and optimized, with many variants becoming available, with structural characteristics and functions that are highly diversified.
Research on type 1 rhodopsins spans now a history of 50 years.
Microbial rhodopsins are diverse photoreceptive proteins containing a retinal chromophore... Microbial rhodopsins participate in a portfolio of light-driven energy and sensory transduction processes.
While animal rhodopsins are G protein coupled receptors, the function of microbial rhodopsins is highly divergent. Many of the microbial rhodopsins are able to transport ions in a passive or an active manner. These light-gated channels or light-driven pumps represent the main tools for respectively effecting neural excitation and silencing in the emerging field of optogenetics.
Unlike animal rhodopsins, several kinds of microbial rhodopsins are able to transport ions in a passive or an active manner, and light-gated channels or light-driven pumps, respectively, are the main tools in optogenetics.
In this review, we introduce the functional conversion of membrane-embedded photoreceptive retinylidene proteins (also called rhodopsins)...
Microbial rhodopsins are a family of photoactive retinylidene proteins widespread throughout the microbial world.
The microbial rhodopsins are a particularly rich substrate for this type of multiphoton optical control.
Supporting Sources
Linked Claims
The review considers applications of optogenetic and thermogenetic molecular tools for activation of non-neuronal tissues and mammalian cells.
The review covers microbial rhodopsins and TRP superfamily proteins as molecular tool categories for optogenetic and thermogenetic methods.
The broadened applicability of microbial rhodopsin variants has encouraged wider use of optogenetics by researchers and clinicians.
Quoted textsource-backed
Their applicability has been broadened, encouraging more researchers and clinicians to utilize optogenetics technology in research.
Microbial rhodopsins were originally discovered as archaeal ion pumps and sensors, but later genetic and sequencing methods identified more proteins across all kingdoms of life.
Spectroscopic and other biophysical studies revealed that microbial rhodopsins have diverse functions.
Research on type 1 rhodopsins spans approximately 50 years.
Molecular biology methods enabled elucidation of microbial rhodopsin function and structure, which in turn led to optogenetic applications.
Ion pumps, sensors, and channels in microbial rhodopsins share a seven-helix transmembrane protein scaffold carrying a retinal prosthetic group.
Microbial rhodopsins have been explored, modified, and optimized into many variants with highly diversified structural characteristics and functions.
Quoted textsource-backed
microbial rhodopsins have been continuously explored, modified, and optimized, with many variants becoming available, with structural characteristics and functions that are highly diversified
Microbial rhodopsins are found in all domains of cellular life and are also encoded in viral genomes.
Quoted textsource-backed
Microbial rhodopsins are diverse photoreceptive proteins containing a retinal chromophore and are found in all domains of cellular life and are even encoded in genomes of viruses.
Microbial rhodopsins comprise two families: type 1 rhodopsins and heliorhodopsins.
Quoted textsource-backed
These rhodopsins make up two families: type 1 rhodopsins and the recently discovered heliorhodopsins.
Microbial rhodopsins participate in light-driven energy and sensory transduction processes.
Quoted textsource-backed
Microbial rhodopsins participate in a portfolio of light-driven energy and sensory transduction processes.
Understanding the molecular mechanism of microbial rhodopsins is a prerequisite for rational exploitation of future optogenetic tools.
Quoted textsource-backed
As history has proven, understanding the molecular mechanism of microbial rhodopsins is a prerequisite for their rational exploitation as the optogenetics tools of the future.
Animal rhodopsins and microbial rhodopsins differ in chromophore state and functional class, with animal rhodopsins described as GPCRs and microbial rhodopsins as functionally diverse ion-transporting proteins.
Quoted textsource-backed
Animal and microbial rhodopsins respectively possess 11-cis and all-trans retinal, respectively... While animal rhodopsins are G protein coupled receptors, the function of microbial rhodopsins is highly divergent. Many of the microbial rhodopsins are able to transport ions in a passive or an active manner.
Microbial rhodopsin light-gated channels and light-driven pumps are the main optogenetic tools for neural excitation and silencing, respectively.
Quoted textsource-backed
These light-gated channels or light-driven pumps represent the main tools for respectively effecting neural excitation and silencing in the emerging field of optogenetics.
Rhodopsins are used as key tools in optogenetics.
Quoted textsource-backed
In addition, they are now used as key tools in optogenetics.
Understanding the molecular mechanism of microbial rhodopsins is a prerequisite for useful functional design of future optogenetics tools.
Quoted textsource-backed
As history has proven, understanding the molecular mechanism of microbial rhodopsins is a prerequisite for useful functional design of optogenetics tools in future.
Several microbial rhodopsins transport ions passively or actively, and light-gated channels and light-driven pumps are the main optogenetic tools among them.
Quoted textsource-backed
Unlike animal rhodopsins, several kinds of microbial rhodopsins are able to transport ions in a passive or an active manner, and light-gated channels or light-driven pumps, respectively, are the main tools in optogenetics.
Animal rhodopsins use 11-cis retinal whereas microbial rhodopsins use all-trans retinal, and photoisomerization initiates their functions.
Quoted textsource-backed
Animal and microbial rhodopsins possess 11-cis and all-trans retinal, respectively, to capture light in seven transmembrane α-helices, and photoisomerizations into all-trans and 13-cis forms, respectively, initiate each function.
Engineered rhodopsins can be used to improve understanding of biological function and to develop protein-based tools relevant to optogenetics.
Functional conversion provides a strategy for rational and atomistic design of biological molecules, including microbial rhodopsins.
Microbial rhodopsins are a diverse family of photoactive proteins that use variations on a shared seven-transmembrane scaffold and similar photochemical reactions to perform distinct light-driven energy and sensory transduction functions.
Microbial rhodopsins are used as tools to control membrane potential with light and are fundamental to optogenetics for research and clinical applications.
Patterned multiphoton illumination can steer light-responsive molecules into distinct fluorescent or activity states and thereby circumvent some limitations of simple one-photon excitation.
Microbial rhodopsins are a particularly rich and engineerable substrate for multiphoton optical control because of their diversity, understood photocycles, and mutational history.