Structures and functions of human placental aromatase and steroid sulfatase, two key enzymes in estrogen biosynthesis.
Level 5 - mechanism / opinion, no new human data
Narrative review of structural biology and biochemical studies without clinical trial or observational human outcome data
PubMed 37207843 · doi:10.1016/j.steroids.2023.109249
What was done
This narrative review summarizes structural and biochemical findings on two human placental endoplasmic reticulum enzymes: cytochrome P450 aromatase (AROM) and steroid sulfatase (STS). The paper reviews methods and discoveries concerning their purification from human placenta, assay development, crystallization, three-dimensional structure determination, active site architecture, reaction mechanisms, substrate specificity, membrane integration, quaternary organization, post-translational modifications, and structure-guided inhibitor design.
What was found
The abstract reports no numerical metrics or quantitative effect sizes. Qualitatively, it notes that AROM converts non-aromatic A-ring androgens to estrogens, while STS is a Ca2+-dependent enzyme that hydrolyzes sulfate esters of estrone and dehydroepiandrosterone into unconjugated precursors of estrogens (17β-estradiol, 16α,17β-estriol) and androgens (testosterone, dihydrotestosterone).
Why it matters
Elucidating the three-dimensional structures and catalytic mechanisms of AROM and STS provides the structural foundation for rational inhibitor design to treat estrogen- and androgen-dependent malignancies, including breast, endometrial, and prostate cancers.
Limits
As a narrative review of in vitro biochemical and crystallographic studies, no clinical outcome data, sample sizes, or systematic study search methodologies are provided. Findings are based on purified placental enzyme models rather than in vivo clinical trials.
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