Source 1primary paper2025MED
Toolkit/Pepper
Pepper
Taxonomy: Mechanism Branch / Component. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
SaFR undergoes conformational reorganization and transforms into the fluorogenic conformation of Pepper, enabling the activation of fluorophores to produce fluorescent signals.
Usefulness & Problems
Why this is useful
Pepper is the fluorogenic RNA conformation used by SaFR to activate fluorescence. In this paper it functions as the signal-generating module restored by target RNA binding.; fluorogenic activation within the SaFR RNA imaging design
Source:
Pepper is the fluorogenic RNA conformation used by SaFR to activate fluorescence. In this paper it functions as the signal-generating module restored by target RNA binding.
Source:
fluorogenic activation within the SaFR RNA imaging design
Problem solved
It provides the fluorescence activation mechanism underlying the SaFR readout. This allows target-dependent conversion from a nonfluorescent to fluorescent state.; provides the fluorogenic conformation that activates cognate fluorophores after target-triggered switching
Source:
It provides the fluorescence activation mechanism underlying the SaFR readout. This allows target-dependent conversion from a nonfluorescent to fluorescent state.
Source:
provides the fluorogenic conformation that activates cognate fluorophores after target-triggered switching
Problem links
provides the fluorogenic conformation that activates cognate fluorophores after target-triggered switching
LiteratureIt provides the fluorescence activation mechanism underlying the SaFR readout. This allows target-dependent conversion from a nonfluorescent to fluorescent state.
Source:
It provides the fluorescence activation mechanism underlying the SaFR readout. This allows target-dependent conversion from a nonfluorescent to fluorescent state.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Component: A low-level RNA part used inside a larger architecture that realizes a mechanism.
Mechanisms
conformational uncagingConformational Uncagingfluorogenic rna–fluorophore activationtarget-induced conformational switchingTechniques
No technique tags yet.
Target processes
No target processes tagged yet.
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: sensorswitch architecture: uncaging
The abstract states that Pepper requires cognate fluorophores for fluorescence activation. Its function in SaFR also depends on conformational reorganization into the Pepper state.; requires cognate fluorophores; requires correct fluorogenic conformation for signal generation
By itself, the abstract does not show Pepper as a complete endogenous RNA imaging workflow independent of the SaFR switching design.; fluorescence is lost when its structure is disrupted by the invader sequence in the absence of target RNA
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
SaFR was used to monitor stress granule assembly and disassembly in real time.
SaFR can track exogenous or endogenous RNAs in live and fixed cells.
In SaFR, an invader sequence disrupts the fluorogenic RNA structure and prevents activation of Pepper cognate fluorophores in the absence of target RNA, whereas target RNA induces conformational reorganization into the fluorogenic Pepper state and enables fluorescence.
SaFR exhibits large dynamic ranges, high specificity, and fast fluorescence generation.
The paper describes development of the sequence-activated fluorescent RNA technique SaFR.
Approval Evidence
1 source1 linked approval claimfirst-pass slug pepper
SaFR undergoes conformational reorganization and transforms into the fluorogenic conformation of Pepper, enabling the activation of fluorophores to produce fluorescent signals.
Source:
mechanismsupports
In SaFR, an invader sequence disrupts the fluorogenic RNA structure and prevents activation of Pepper cognate fluorophores in the absence of target RNA, whereas target RNA induces conformational reorganization into the fluorogenic Pepper state and enables fluorescence.
Source:
Comparisons
Source-backed strengths
supports fluorophore activation when the correct conformation is formed
Source:
supports fluorophore activation when the correct conformation is formed
Compared with environment-sensitive fluorescent labels
Pepper and environment-sensitive fluorescent labels address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Compared with phosphorothioate-caged antisense oligonucleotides
Pepper and phosphorothioate-caged antisense oligonucleotides address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Strengths here: looks easier to implement in practice.
Compared with RNA nanostar-derived scaffold
Pepper and RNA nanostar-derived scaffold address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Ranked Citations
- 1.