Cited by 38Metal-Catalyzed Oxygenation MechanismsChemical Reaction MechanismsSteroid Chemistry and Biochemistry

Minor activities and transition state properties of the human steroid hydroxylases cytochromes P450c17 and P450c21, from reactions observed with deuterium-labeled substrates

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Yoshimoto, Francis K., Zhou, Yishan, Peng, Hwei-Ming, Stidd, David, Yoshimoto, Jennifer A., Sharma, Kamalesh K., Matthew, Susan, Auchus, Richard J.·2012·Biochemistry

Abstract

The steroid hydroxylases CYP17A1 (P450c17, 17-hydroxylase/17,20-lyase) and CYP21A2 (P450c21, 21-hydroxylase) catalyze progesterone hydroxylation at one or more sites within a 2 Å radius. We probed their hydrogen atom abstraction mechanisms and regiochemical plasticity with deuterium-labeled substrates: 17-[(2)H]-pregnenolone; 17-[(2)H]-, 16α-[(2)H]-, 21,21,21-[(2)H(3)]-, and 21-[(2)H]-progesterone; and 21,21,21-[(2)H(3)]-17-hydroxyprogesterone. Product distribution and formation rates with recombinant human P450-oxidoreductase and wild-type human CYP17A1 or mutation A105L (reduced progesterone 16α-hydroxylation) and wild-type human CYP21A2 or mutation V359A (substantial progesterone 16α-hydroxylation) were used to calculate intramolecular and intermolecular kinetic isotope effects (KIEs). The intramolecular KIEs for CYP17A1 and mutation A105L were 4.1 and 3.8, respectively, at H-17 and 2.9 and 5.1, respectively, at H-16α. Mutation A105L 21-hydroxylates progesterone (5% of products), and wild-type CYP17A1 also catalyzes a trace of 21-hydroxylation, which increases with 16α-[(2)H]- and 17-[(2)H]-progesterone. The intramolecular KIEs with CYP21A2 mutation V359A and progesterone were 6.2 and 3.8 at H-21 and H-16α, respectively. Wild-type CYP21A2 also forms a trace of 16α-hydroxyprogesterone, which increased with 21,21,21-[(2)H(3)]-progesterone substrate. Competitive intermolecular KIEs paralleled the intramolecular KIE values, with (D)V values of 1.4-5.1 and (D)V/K values of 1.8-5.1 for these reactions. CYP17A1 and CYP21A2 mutation V359A both 16α-hydroxylate 16α-[(2)H]-progesterone with 33-44% deuterium retention, indicating stereochemical inversion. We conclude that human CYP17A1 has progesterone 21-hydroxylase activity and human CYP21A2 has progesterone 16α-hydroxylase activity, both of which are enhanced with deuterated substrates. The transition states for C-H bond cleavage in these hydroxylation reactions are either significantly nonlinear and/or asymmetric, and C-H bond breakage is partially rate-limiting for all reactions.

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  • 21-hydroxylation of progesterone by hepatic cytochrome P450 enzymes other than CYP21A2 may permit some mineralocorticoid (11-deoxycorticosterone) synthesis.

    “Moreover, 21-hydroxylation of progesterone by hepatic cytochrome P450 enzymes other than CYP21A2 may permit some mineralocorticoid (11deoxycorticosterone) synthesis (102).”

    From Congenital Adrenal Hyperplasia—Current Insights in Pathophysiology, Diagnostics, and Management (2022) · cites this paper as [102]

    The Results (page unavailable) report that CYP17A1, an enzyme other than CYP21A2, 21-hydroxylates progesterone to form 11-deoxycorticosterone (DOC). The Discussion (page unavailable) suggests this trace activity might matter in CYP21A2 deficiency. The paper does not establish that the enzyme is hepatic or that the reaction permits mineralocorticoid synthesis in the liver. (LLM, conf=0.87)

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Authors
Yoshimoto, F. K., Zhou, Y., Peng, H.-M., Stidd, D., Yoshimoto, J. A., Sharma, K. K., Matthew, S., & Auchus, R. J.
Affiliations
University of Michigan (US)
Corresponding author
Auchus, Richard J.
Venue
Biochemistry
Published
2012-08-27
Volume
51
Issue
36
Pages
7064-7077
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W1967240005
Cited by
38
References
47
Citations by year
2026: 1 · 2025: 3 · 2024: 2 · 2022: 1 · 2021: 4 · 2020: 5 · 2018: 1 · 2017: 6 · 2016: 4 · 2015: 4 · 2014: 7
FWCI
1.92
Type
journal article
Language
en
Open access
Locations
  • Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of General Medical Sciences (R01-GM08659602, R01GM086596)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK089503, P30DK089503)
Topics
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
  • Physical Sciences › Chemistry › Organic Chemistry › Chemical Reaction Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Steroid Chemistry and Biochemistry
Keywords
CYP17A1, CYP21A2, 21-hydroxylase, progesterone hydroxylation, hydrogen abstraction, kinetic isotope effects, regioselectivity, transition state, 16α-hydroxylation, 17-hydroxyprogesterone, cytochrome P450 oxidoreductase
MeSH terms
Deuterium, Humans, Kinetics, Protein Binding, Steroid 17-alpha-Hydroxylase, Steroid 21-Hydroxylase, Steroids

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