Reading a paper on P450 modification of bufadienolides
This note is written in Chinese. Below is a short summary of what the entry covers.
Summary
The paper assigns one hydroxylation step on the bufadienolide core to a specific cytochrome P450, identified by tissue expression profiling followed by candidate gene screening, expressed heterologously and confirmed by mass spectrometry.
What is worth learning from it
- Narrowing the candidate set early. Expression profiling reduced hundreds of P450s to a handful before any assay work.
- Generous in vitro conditions. Buffer, pH and cofactor regeneration were given enough headroom to avoid false negatives.
- Two orthogonal lines of product evidence. Mass fragments plus co-elution with a standard, rather than mass fragments alone.
Where I disagree or want more
The gap between in vitro conditions and the real system is not discussed; selectivity is described qualitatively without relative activity numbers; and product inhibition, which is plausible for these compounds, is not checked.
Full note (Chinese): /notes.html
All Notes
Browse all literature reviews and notes: Go to all notes archive →