What question did this study set out to answer?

To establish a reproducible method for expressing, purifying, and characterizing the functionally active human 11β-hydroxylase enzyme.

January 22, 2008FEBS Journal

Purification and functional characterization of human 11β hydroxylase expressed in Escherichia coli

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Authors

AZAndy ZöllnerDuke University NKNorio KagawaNagoya University MWMichael R. WatermanElectroimpact (United States)

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Implication

In vitro study reports reproducible purification and activity of human 11β-hydroxylase in Escherichia coli, highlighting multiple electron-transfer binding sites for steroidogenesis.

Key Points

To establish a reproducible method for expressing, purifying, and characterizing the functionally active human 11β-hydroxylase enzyme.
Coexpressed recombinant human 11β-hydroxylase (hCYP11B1) alongside molecular chaperones GroES/GroEL in Escherichia coli and purified the protein to homogeneity.
Verified protein mass using mass spectrometry and assessed secondary structure with circular dichroism.
Assessed enzymatic activity, NADPH coupling efficiency, and redox partner interactions using substrate conversion assays, stopped-flow kinetics, and Biacore surface plasmon resonance.
Mass spectrometry identified a mass-to-charge ratio (m/z) of 55,761, consistent with the predicted post-translational mass of 55,760.76 lacking the initiator methionine.
Recombinant hCYP11B1 hydroxylated substrates at the 11-beta position with approximately 75% NADPH coupling efficiency for both 11-deoxycortisol and 11-deoxycorticosterone.
Stopped-flow and Biacore measurements indicated more than one binding site for adrenodoxin, suggesting the formation of multiple productive electron-transfer complexes.

Cite This Study

Zöllner et al. (2008) studied this question.

synapsesocial.com/papers/6a8878f68e586ad1c8a55d42 https://doi.org/10.1111/j.1742-4658.2008.06253.x

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Implication

In vitro study reports reproducible purification and activity of human 11β-hydroxylase in Escherichia coli, highlighting multiple electron-transfer binding sites for steroidogenesis.

Purification and functional characterization of human 11β hydroxylase expressed in Escherichia coli

Discussion

Member takes

Implication

Key Points

Cite This Study

Purification and functional characterization of human 11β hydroxylase expressed in Escherichia coli

Discussion

Member takes

Implication

Key Points

Cite This Study

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