Source 1review2021Journal of Biological Chemistry
Toolkit/LOV2
LOV2
Taxonomy: Mechanism Branch / Component. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
LOV2 is a blue-light-sensing Light-Oxygen-Voltage domain from phototropins, which are multidomain plant photoreceptors containing LOV1, LOV2, and a C-terminal serine/threonine kinase domain. In this native context, light activation of LOV2 induces structural changes that are transmitted to the kinase domain to regulate signaling.
Usefulness & Problems
Why this is useful
LOV2 is useful as a regulatory photosensory module because it converts blue-light input into a protein conformational change linked to kinase regulation. The cited literature also states that phototropins have inspired diverse optogenetic tools, supporting the relevance of LOV2-derived light control for engineering applications.
Source:
The phototropins (phots) are light-activated kinases that are critical for plant physiology and the many diverse optogenetic tools that they have inspired.
Problem solved
LOV2 helps solve the problem of coupling a defined optical stimulus to reversible regulation of protein signaling output. Specifically, in phototropins it provides the light-responsive module that communicates blue-light detection to a serine/threonine kinase domain.
Published Workflows
Objective: Develop an optogenetic approach for inducing synaptic plasticity at the level of single synapses.
Why it works: The workflow pairs a light-sensitive LOV2-CaMKIIα fusion with two-photon excitation so that activation can be confined to single spines, allowing local molecular perturbation and readout of cellular responses.
light-dependent activation of CaMKIIinduction of long-term potentiation in single spinesprotein fusion engineeringtwo-photon excitationlocal optical activation with response measurement
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Component: A low-level protein part used inside a larger architecture that realizes a mechanism.
Mechanisms
alpha-helix unfoldingblue-light sensingintramolecular signal transduction to a kinase domainlight-induced conformational switchingTechniques
Structural CharacterizationTarget processes
signalingInput: Light
Implementation Constraints
LOV2 occurs naturally within phototropins together with LOV1 and a C-terminal serine/threonine kinase domain. Available evidence supports an extended linear multidomain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe, but the supplied material does not provide construct design rules, cofactors, or expression guidance.
The evidence provided is centered on native phototropin architecture and mechanism rather than direct benchmarking of LOV2 as a standalone engineered tool. The source also notes that high-resolution structural information on phototropins remains challenging to obtain, which limits mechanistic completeness and structure-guided engineering.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
Phototropins contain two blue-light-sensing LOV domains, LOV1 and LOV2, together with a C-terminal serine/threonine kinase domain.
Phototropins combine two blue-light-sensing Light-Oxygen-Voltage (LOV) domains (LOV1 and LOV2) and a C-terminal serine/threonine kinase domain, using the LOV domains to control the catalytic activity of the kinase.
Phototropins are light-activated kinases important for plant physiology and have inspired diverse optogenetic tools.
The phototropins (phots) are light-activated kinases that are critical for plant physiology and the many diverse optogenetic tools that they have inspired.
High-resolution structural information on phototropins remains challenging to obtain and is presented as important for both fundamental understanding and engineering efforts.
the challenges that will have to be overcome to obtain high-resolution structural information on these exciting photoreceptors. Such information will be essential to advancing fundamental understanding of plant physiology while enabling engineering efforts at both the whole plant and molecular levels.
Activation of the LOV2 domain triggers unfolding of alpha helices that communicate the light signal to the kinase domain.
activation of the LOV2 domain triggers the unfolding of alpha helices that communicate the light signal to the kinase domain
Recent SAXS and other biophysical studies of multidomain phototropins from Chlamydomonas and Arabidopsis support models with an extended linear domain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe.
Recent studies have made progress addressing these questions by utilizing small-angle X-ray scattering (SAXS) and other biophysical approaches to study multidomain phots from Chlamydomonas and Arabidopsis, leading to models where the domains have an extended linear arrangement, with the regulatory LOV2 domain contacting the kinase domain N-lobe.
Recent SAXS and other biophysical studies of multidomain phototropins from Chlamydomonas and Arabidopsis support models with an extended linear domain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe.
Recent studies have made progress addressing these questions by utilizing small-angle X-ray scattering (SAXS) and other biophysical approaches to study multidomain phots from Chlamydomonas and Arabidopsis, leading to models where the domains have an extended linear arrangement, with the regulatory LOV2 domain contacting the kinase domain N-lobe.
Recent SAXS and other biophysical studies of multidomain phototropins from Chlamydomonas and Arabidopsis support models with an extended linear domain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe.
Recent studies have made progress addressing these questions by utilizing small-angle X-ray scattering (SAXS) and other biophysical approaches to study multidomain phots from Chlamydomonas and Arabidopsis, leading to models where the domains have an extended linear arrangement, with the regulatory LOV2 domain contacting the kinase domain N-lobe.
Recent SAXS and other biophysical studies of multidomain phototropins from Chlamydomonas and Arabidopsis support models with an extended linear domain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe.
Recent studies have made progress addressing these questions by utilizing small-angle X-ray scattering (SAXS) and other biophysical approaches to study multidomain phots from Chlamydomonas and Arabidopsis, leading to models where the domains have an extended linear arrangement, with the regulatory LOV2 domain contacting the kinase domain N-lobe.
Recent SAXS and other biophysical studies of multidomain phototropins from Chlamydomonas and Arabidopsis support models with an extended linear domain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe.
Recent studies have made progress addressing these questions by utilizing small-angle X-ray scattering (SAXS) and other biophysical approaches to study multidomain phots from Chlamydomonas and Arabidopsis, leading to models where the domains have an extended linear arrangement, with the regulatory LOV2 domain contacting the kinase domain N-lobe.
Recent SAXS and other biophysical studies of multidomain phototropins from Chlamydomonas and Arabidopsis support models with an extended linear domain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe.
Recent studies have made progress addressing these questions by utilizing small-angle X-ray scattering (SAXS) and other biophysical approaches to study multidomain phots from Chlamydomonas and Arabidopsis, leading to models where the domains have an extended linear arrangement, with the regulatory LOV2 domain contacting the kinase domain N-lobe.
Recent SAXS and other biophysical studies of multidomain phototropins from Chlamydomonas and Arabidopsis support models with an extended linear domain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe.
Recent studies have made progress addressing these questions by utilizing small-angle X-ray scattering (SAXS) and other biophysical approaches to study multidomain phots from Chlamydomonas and Arabidopsis, leading to models where the domains have an extended linear arrangement, with the regulatory LOV2 domain contacting the kinase domain N-lobe.
Approval Evidence
4 sources6 linked approval claimsfirst-pass slug lov2
by fusing a light-sensitive domain (LOV2) to CaMKIIα
Source:
Explicitly supported tool/component names found in these sources include Cph1, CRY2olig, EL222, LOV2, OptoAMP, and PULSE.
Source:
Phototropins combine two blue-light-sensing Light-Oxygen-Voltage (LOV) domains (LOV1 and LOV2) and a C-terminal serine/threonine kinase domain.
Source:
The supplied web research summary states that major conformational control scaffolds include LOV2 and that multiple primary and review sources identify the Avena sativa LOV2 domain as a central photosensory conformational switch used for steric and allosteric regulation.
Source:
tool developmentsupports
The authors developed photoactivatable CaMKII by fusing LOV2 to CaMKIIα.
Source:
component in scopesupports
The review explicitly supports Cph1, CRY2olig, EL222, LOV2, OptoAMP, and PULSE as named optogenetic components or tools within its scope.
Explicitly supported tool/component names found in these sources include Cph1, CRY2olig, EL222, LOV2, OptoAMP, and PULSE.
Source:
domain architecturesupports
Phototropins contain two blue-light-sensing LOV domains, LOV1 and LOV2, together with a C-terminal serine/threonine kinase domain.
Phototropins combine two blue-light-sensing Light-Oxygen-Voltage (LOV) domains (LOV1 and LOV2) and a C-terminal serine/threonine kinase domain, using the LOV domains to control the catalytic activity of the kinase.
Source:
mechanism summarysupports
Activation of the LOV2 domain triggers unfolding of alpha helices that communicate the light signal to the kinase domain.
activation of the LOV2 domain triggers the unfolding of alpha helices that communicate the light signal to the kinase domain
Source:
structural modelsupports
Recent SAXS and other biophysical studies of multidomain phototropins from Chlamydomonas and Arabidopsis support models with an extended linear domain arrangement in which the regulatory LOV2 domain contacts the kinase domain N-lobe.
Recent studies have made progress addressing these questions by utilizing small-angle X-ray scattering (SAXS) and other biophysical approaches to study multidomain phots from Chlamydomonas and Arabidopsis, leading to models where the domains have an extended linear arrangement, with the regulatory LOV2 domain contacting the kinase domain N-lobe.
Source:
mechanism summarysupports
LOV2 is a central photosensory conformational switch used for steric and allosteric regulation in light-controlled protein systems.
Source:
Comparisons
Source-backed strengths
The domain has a defined native role in blue-light sensing and signal transmission within phototropins. Biophysical studies, including SAXS on multidomain phototropins from Chlamydomonas and Arabidopsis, support structural models in which LOV2 contacts the kinase N-lobe and undergoes light-triggered alpha-helical unfolding associated with activation.
Ranked Citations
- 1.