Concept
Chemical biology
8 studies1 discovery
Chemical biology uses small molecules, probes or reactions to perturb or report on biomolecules — without turning the paper into a gene-expression study.
It is the applied edge of the chemistry library: PROTACs, photoaffinity tags and peptide C–H functionalisation.
Studies
8
Findings
5
7 supporting · 0 challenging · 0 qualifying citations
Open tensions
1
Currently
What we know
- This library holds 8 empirical chemistry papers on chemical biology with isolated findings, rates or spectra rather than reviews.
- A Phen-DC3 handle lets chemists add BODIPY or a cell-penetrating peptide without losing G4 selectivity, showing the parent ligand misses the nucleus.
- A cereblon-recruiting degrader based on LIMKi3 and a phenyl dihydrouracil ligand wipes out LIMK2 at nanomolar DC50 while leaving LIMK1 and phospho-cofilin largely intact.
- Photoaffinity GSH analog DAZ-G labels the CaSR amino-acid site and shows caffeine is a positive allosteric modulator.
- A ubiquitin-propargylamine activity probe plus MS screens how selective DUB inhibitors are in a cellular protein matrix.
Largest unresolved question
A binding pose or a DC50 in one cell line is not a drug; off-target proteome labelling varies with the tag.
Common misconceptions
A probe that binds a protein is a medicine.
Chemical biology reports molecular recognition and occupancy, not clinical efficacy.
Claim ledger
What the evidence shows
Drawn from 8 studies in this library. Mix labels say which citation roles are present; they are not a strength score. Supports means evidence for a finding; Challenges means evidence against a stated position; Qualifies marks scope.
This library holds 8 empirical chemistry papers on chemical biology with isolated findings, rates or spectra rather than reviews.
- Phen-DC3 probes that reveal G4 ligand localization
- PROTAC THNAN69 degrades LIMK2, not LIMK1
- A glutathione probe finds caffeine as a CaSR PAM
Study Role Design N Population Outcome Phen-DC3 probes that reveal G4 ligand localization Supports Animal / in-vitroPhen-DC3 conjugate synthesis with G4 assays and live-cell imaging in HeLa cells Cell-based probe study; no single primary analytic N HeLa cells and in-vitro G4 DNA assays G4 stabilization, cellular localization, and mtDNA copy-number effects of Phen-DC3 conjugates PROTAC THNAN69 degrades LIMK2, not LIMK1 Supports Animal / in-vitroCRBN/VHL PROTACs of LIMKi3 ranked by cellular degradation and proteomics Cell-based degrader SAR (e.g., HuCCT1 EGFP–LIMK2 / Western blot) — no subject N Cultured cells expressing LIMK2 (including HuCCT1) LIMK2-selective degradation potency (THNAN69 DC50 ≈ 1 nM) A glutathione probe finds caffeine as a CaSR PAM Supports Animal / in-vitroDAZ-G photoaffinity labeling of CaSR in HEK293 cells plus intracellular Ca2+ flux Competition and Ca2+ assays across caffeine concentrations rather than a single N HEK293 cells expressing calcium-sensing receptor Caffeine is a positive allosteric modulator of CaSR, enhancing DAZ-G labeling at low micromolar concentrations when extracellular Ca2+ is present A Phen-DC3 handle lets chemists add BODIPY or a cell-penetrating peptide without losing G4 selectivity, showing the parent ligand misses the nucleus.
A cereblon-recruiting degrader based on LIMKi3 and a phenyl dihydrouracil ligand wipes out LIMK2 at nanomolar DC50 while leaving LIMK1 and phospho-cofilin largely intact.
Photoaffinity GSH analog DAZ-G labels the CaSR amino-acid site and shows caffeine is a positive allosteric modulator.
A ubiquitin-propargylamine activity probe plus MS screens how selective DUB inhibitors are in a cellular protein matrix.
Debates
Tensions and limits
Some items are genuine disagreements on the same question. Others mark different assays, populations, or outcomes.
A binding pose or a DC50 in one cell line is not a drug; off-target proteome labelling varies with the tag.
A binding pose or a DC50 in one cell line is not a drug; off-target proteome labelling varies with the tag.
Study Role Design N Population Outcome Phen-DC3 probes that reveal G4 ligand localization Supports Animal / in-vitroPhen-DC3 conjugate synthesis with G4 assays and live-cell imaging in HeLa cells Cell-based probe study; no single primary analytic N HeLa cells and in-vitro G4 DNA assays G4 stabilization, cellular localization, and mtDNA copy-number effects of Phen-DC3 conjugates PROTAC THNAN69 degrades LIMK2, not LIMK1 Supports Animal / in-vitroCRBN/VHL PROTACs of LIMKi3 ranked by cellular degradation and proteomics Cell-based degrader SAR (e.g., HuCCT1 EGFP–LIMK2 / Western blot) — no subject N Cultured cells expressing LIMK2 (including HuCCT1) LIMK2-selective degradation potency (THNAN69 DC50 ≈ 1 nM)
PaperFren reads this as a limit on how far one study travels — different assays, populations, or outcomes — not a forced fight between papers.
Timeline
How understanding moved
Study years are when the paper was published. Evidence edits are dated changes to this page's claims. Explanations are when PaperFren added a Discovery — not a claim that the science happened that day.
2026
- PROTAC THNAN69 degrades LIMK2, not LIMK1
Concept page published
Chemical biology
- Two amyloid peptides share a solution, form separate fibrils, and still affect each other
Change log
What changed
Dated edits to this page's evidence: studies added or removed from a claim, claims added or withdrawn, and new explanations tagged here. Coverage edits are distinct from reviewed research changes and corrections. Dates record PaperFren updates; study publication dates appear in the timeline.
- Coverage updated · Concept page published
Papers
8 studies in this library bear on Chemical biology, ordered by citations.
- Aβ40 and Aβ42 make separate fibrils after mixed nuclei
In mixtures, Aβ42 fibrillizes first; elongation and secondary nucleation stay homospecific, so each peptide builds its own fibrils.
- Protecting-group-free peptide CF3 labeling
ZnTFMS/TBHP or Ir photoredox trifluoromethylates tyrosine C–H on unprotected peptides, including insulin, without hitting polar side chains.
- Not all diazirine proteomics tags photoactivate alike
Comparing fully functionalized diazirine tags shows dialkyl tags LD/BD photolyze at 365 nm in minutes, while a new tiny terminal tag needs 302 nm light and labels fewer peptides.
- Calixarene docks dimethyllysine on lysozyme
p-Sulfonatocalix[4]arene selectively encapsulates Lys116-Me2 on dimethylated lysozyme, mimicking an aromatic cage.
- Phen-DC3 probes that reveal G4 ligand localization
A Phen-DC3 handle lets chemists add BODIPY or a cell-penetrating peptide without losing G4 selectivity, showing the parent ligand misses the nucleus.
- High-throughput ABPP of DUB inhibitors in lysates
A ubiquitin-propargylamine activity probe plus MS screens how selective DUB inhibitors are in a cellular protein matrix.
- A glutathione probe finds caffeine as a CaSR PAM
Photoaffinity GSH analog DAZ-G labels the CaSR amino-acid site and shows caffeine is a positive allosteric modulator.
- PROTAC THNAN69 degrades LIMK2, not LIMK1
A cereblon-recruiting degrader based on LIMKi3 and a phenyl dihydrouracil ligand wipes out LIMK2 at nanomolar DC50 while leaving LIMK1 and phospho-cofilin largely intact.
Compare studies
Select 2–10 studies. Design and N are labels, not a ranking.
Nothing selected yet.
Questions
What is still open
A binding pose or a DC50 in one cell line is not a drug; off-target proteome labelling varies with the tag.
Ask PaperFren about Chemical biology
Study this conceptflashcards and short-answer questions
What does chemical biology mean in this chemistry library?
Chemical biology uses small molecules, probes or reactions to perturb or report on biomolecules — without turning the paper into a gene-expression study.
Name one empirical finding from the chemical biology papers.
A Phen-DC3 handle lets chemists add BODIPY or a cell-penetrating peptide without losing G4 selectivity, showing the parent ligand misses the nucleus.
What is a limit of chemical biology evidence here?
A binding pose or a DC50 in one cell line is not a drug; off-target proteome labelling varies with the tag.