DOI: 10.1046/j.1432-1033.2002.02729.x. The effect of amino‐acid substitutions I112P, D147E and K152N in CYP11B2 on the catalytic activities of the enzyme

The effect of amino‐acid substitutions I112P, D147E and K152N in CYP11B2 on the catalytic activities of the enzyme

10.1046/j.1432-1033.2002.02729.x

Crossref journal-article

Wiley

European Journal of Biochemistry (311)

Abstract

By replacing specific amino acids at positions 112, 147 and 152 of the human aldosterone synthase (CYP11B2) with the corresponding residues from human, mouse or rat 11β‐hydroxylase (CYP11B1), we have been able to investigate whether these residues belong to structural determinants of individual enzymatic activities. When incubated with 11‐deoxycorticosterone (DOC), the 11β‐hydroxylation activity of the mutants was most effectively increased by combining D147E and I112P (sixfold increase). The two substitutions displayed an additive effect. The same tendency can be observed when using 11‐deoxycortisol as a substrate, although the effect is less pronounced. The second step of the CYP11B2‐dependent DOC conversion, the 18‐hydroxylation activity, was not as strongly increased as the 11β‐hydroxylation potential. Activity was unaffected by D147E, whereas the single mutant I112P displayed the most pronounced activation (70% enhancement), thus causing different increasing effects on the first two enzymatic reaction steps. A slightly enhanced aldosterone synthesis from DOC could be measured due to increased levels of the intermediates. However, the 18‐oxidation activity of all the mutants, except for I112S and D147E, was slightly reduced. The strongly enhanced 18‐hydroxycorticosterone and aldosterone formation observed in the mutants provides important information on a possible role of such amino‐acid replacements in the development of essential hypertension. Furthermore, the results indicate the possibility of a differential as well as independent modification of CYP11B2 reaction steps. The combination of functional data and computer modelling of CYP11B2 suggests an indirect involvement of residue 147 in the regulation of CYP11B isoform specific substrate conversion due to its location on the protein surface. In addition, the results indicate the functional significance of amino‐acid 112 in the putative substrate access channel of human CYP11B2. Thus, we present the first example of substrate recognition and conversion being attributed to the N‐terminal part of human CYP11B2.

Bibliography

Bechtel, S., Belkina, N., & Bernhardt, R. (2002). The effect of aminoâacid substitutions I112P, D147E and K152N in CYP11B2 on the catalytic activities of the enzyme. European Journal of Biochemistry, 269(4), 1118â1127. Portico.

Authors 3

Stephanie Bechtel (first)
Natalya Belkina (additional)
Rita Bernhardt (additional)

References 53 Referenced 21

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Dates

Type	When
Created	22 years, 5 months ago (March 11, 2003, 1:39 p.m.)
Deposited	1 year, 10 months ago (Oct. 31, 2023, 5:03 a.m.)
Indexed	1 year, 2 months ago (June 25, 2024, 7:11 a.m.)
Issued	23 years, 6 months ago (Feb. 15, 2002)
Published	23 years, 6 months ago (Feb. 15, 2002)
Published Online	23 years, 6 months ago (Feb. 20, 2002)
Published Print	23 years, 6 months ago (Feb. 15, 2002)

Funders 0

None

BibTeX

@article{Bechtel_2002, title={The effect of amino‐acid substitutions I112P, D147E and K152N in CYP11B2 on the catalytic activities of the enzyme}, volume={269}, ISSN={1432-1033}, url={http://dx.doi.org/10.1046/j.1432-1033.2002.02729.x}, DOI={10.1046/j.1432-1033.2002.02729.x}, number={4}, journal={European Journal of Biochemistry}, publisher={Wiley}, author={Bechtel, Stephanie and Belkina, Natalya and Bernhardt, Rita}, year={2002}, month=feb, pages={1118–1127} }

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