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Titel: Structure-Based Engineering of Steroidogenic CYP260A1 for Stereo- and Regioselective Hydroxylation of Progesterone
VerfasserIn: Khatri, Yogan
Jóźwik, Ilona K.
Ringle, Michael
Ionescu, Irina Alexandra
Litzenburger, Martin
Hutter, Michael Christopher
Thunnissen, Andy-Mark W. H.
Bernhardt, Rita
Sprache: Englisch
Titel: ACS Chemical Biology
Bandnummer: 13
Heft: 4
Seiten: 1021-1028
Verlag/Plattform: American Chemical Society
Erscheinungsjahr: 2018
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: The production of regio- and stereoselectively hydroxylated steroids is of high pharmaceutical interest and can be achieved by cytochrome P450-based biocatalysts. CYP260A1 from Sorangium cellulosum strain So ce56 catalyzes hydroxylation of C19 or C21 steroids at the very unique 1α-position. However, the conversion of progesterone (PROG) by CYP260A1 is very unselective. In order to improve its selectivity we applied a semirational protein engineering approach, resulting in two different, highly regio- and stereoselective mutants by replacing a single serine residue (S276) of the substrate recognition site 5 with an asparagine or isoleucine. The S276N mutant converted PROG predominantly into 1α-hydroxy-PROG, while the S276I mutant led to 17α-hydroxy-PROG. We solved the high-resolution crystal structures of the PROG-bound S276N and S276I mutants, which revealed two different binding modes of PROG in the active site. The orientations were consistent with the exclusive 1α- (pro-1α binding mode) and 17α-hydroxylation (pro-17α-binding mode) of S276N and S276I, respectively. We observed that water-mediated hydrogen bonds contribute to the stabilization of the polar C3 and C17 substituents of PROG. Both binding modes of PROG may be stabilized in the wild-type enzyme. The change in regioselectivity is mainly driven by destabilizing the alternative binding mode due to steric hindrance and hydrogen bond disruption, caused by the mutations of Ser276. Thus, for the first time, the change in the selectivity of cytochrome P450-mediated steroid hydroxylation created by rational mutagenesis can be explained by the obtained 3D structures of the substrate-bound mutants, providing the basis for further experiments to engineer the biocatalyst toward novel steroid hydroxylation positions.
DOI der Erstveröffentlichung: 10.1021/acschembio.8b00026
URL der Erstveröffentlichung: https://doi.org/10.1021/acschembio.8b00026
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-413112
hdl:20.500.11880/37054
http://dx.doi.org/10.22028/D291-41311
ISSN: 1554-8937
1554-8929
Datum des Eintrags: 14-Dez-2023
Bezeichnung des in Beziehung stehenden Objekts: Supporting Information
In Beziehung stehendes Objekt: https://pubs.acs.org/doi/suppl/10.1021/acschembio.8b00026/suppl_file/cb8b00026_si_001.pdf
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Biowissenschaften
Professur: NT - Prof. Dr. Volkhard Helms
NT - Keiner Professur zugeordnet
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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