Concept
Chemical biology
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.
Evidence
What the evidence shows
Drawn from 8 studies in this library. Each finding starts with a plain-language takeaway, then the denser detail. Supports means evidence for a finding; Challenges means evidence against a stated position; Qualifies marks scope with a short note on each study’s contribution. Challenged positions are labeled — they are not findings.
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.
Open questions
Tensions and limits
Some items are genuine disagreements on the same question. Others mark different assays, populations, or outcomes — limits on how far one study travels — not a forced fight between papers.
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)
Common misconceptions
A probe that binds a protein is a medicine.
Chemical biology reports molecular recognition and occupancy, not clinical efficacy.
Exam-style questions
Short-answer questions that ask you to explain or compare, not recall.
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.
The studies
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.
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. Rewordings are not listed.
- Concept page published