EL222 is a blue light-activated LOV-HTH transcription factor from the marine bacterium Erythrobacter litoralis HTCC2594 that functions as a light-dependent DNA-binding protein for optical control of transcription. Its flavin mononucleotide chromophore photodynamics have been characterized in free solution and when embedded in EL222 variants.
Toolkit Items
Browse the toolkit beneath workflows. The mechanism branch runs mechanism -> architecture -> component, while the technique branch runs from high-level approaches down to concrete methods.
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Mechanism Branch
Layer 1
Mechanisms
▾Top-level concepts: biophysical action modes such as heterodimerization, photocleavage, or RNA binding.
Layer 1
Mechanisms
Layer 2
Architectures
▾Arrangements that realize or deploy mechanisms, including switches, construct patterns, and delivery strategies.
Layer 2
Architectures
Layer 3
Components
▾Low-level parts and sequence-defined elements used inside architectures, including protein domains and RNA elements.
Layer 3
Components
Technique Branch
Layer 1
Approaches
▾High-level engineering practices such as computational design, directed evolution, sequence verification, and functional assay.
Layer 1
Approaches
Layer 2
Methods
▾Concrete methods used to design, build, verify, or characterize engineered systems.
Layer 2
Methods
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bidirectional promoter system
Construct PatternThe bidirectional promoter system is an engineered EL222-based optogenetic construct pattern for Escherichia coli that enables blue light-mediated transcriptional activation and repression from a bidirectional promoter architecture. It uses the blue light-dependent DNA-binding protein EL222 to provide rapid and reversible control of gene expression.