Structural basis for androgen specificity and oestrogen synthesis in human aromatase.
Level 5 - mechanism / opinion, no new human data
In vitro structural biology and bench research (X-ray crystallography)
PubMed 19129847 · doi:10.1038/nature07614
What was done
Researchers determined the crystal structure of full-length human placental aromatase (cytochrome P450) to resolve the structural basis of its substrate specificity, catalytic mechanism of oestrogen synthesis from androgens, and membrane integration.
What was found
The abstract reports no quantitative values. Structurally, the crystal structure revealed an androgen-specific active site cleft that tightly accommodates androstenedione using complementary hydrophobic and polar residues. The structural arrangement of the hydrophobic amino-terminal domain relative to the active site cleft demonstrates how lipophilic androgen substrates enter the enzyme from the endoplasmic reticulum membrane.
Why it matters
Resolving the crystal structure of human aromatase defines the molecular architecture underlying androgen-to-oestrogen conversion, enabling structure-guided design of next-generation aromatase inhibitors for oestrogen-dependent breast cancer.
Limits
This is an in vitro structural biology study using crystallized protein rather than living cellular systems or clinical models. The abstract provides qualitative structural descriptions and does not report quantitative binding affinities, kinetic parameters, or crystallographic resolution metrics.
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