Substrate Hunting for the Myxobacterial CYP260A1 Revealed New 1α-Hydroxylated Products from C-19 Steroids
作者:Yogan Khatri、Michael Ringle.、Michael Lisurek、Jens Peter von Kries、Josef Zapp、Rita Bernhardt
DOI:10.1002/cbic.201500420
日期:2016.1
The first 1α: CYP260A1 performed predominant 1α‐hydroxylation of testosterone, androstenedione, and 11‐oxoandrostenedione; however, testosterone acetate was hydroxylated at both the 1α‐ and the 9α‐positions. This hydroxylation offers scope for further chemical modification at the steroidal C‐1 position, which is of significant pharmaceutical interest.
Myxobacteria, especially members of the genus Sorangium, are known for their biotechnological potential as producers of pharmaceutically valuable secondary metabolites. The biosynthesis of several of those myxobacterial compounds includes cytochrome P450 activity. Although class I cytochrome P450 enzymes occur wide-spread in bacteria and rely on ferredoxins and ferredoxin reductases as essential electron mediators, the study of these proteins is often neglected. Therefore, we decided to search in the Sorangium cellulosum So ce56 genome for putative interaction partners of cytochromes P450. In this work we report the investigation of eight myxobacterial ferredoxins and two ferredoxin reductases with respect to their activity in cytochrome P450 systems. Intriguingly, we found not only one, but two ferredoxins whose ability to sustain an endogenous So ce56 cytochrome P450 was demonstrated by CYP260A1-dependent conversion of nootkatone. Moreover, we could demonstrate that the two ferredoxins were able to receive electrons from both ferredoxin reductases. These findings indicate that S. cellulosum can alternate between different electron transport pathways to sustain cytochrome P450 activity.
Microbiological Transformations. V. 1α- and 2β-Hydroxylations of C<sub>19</sub>-Steroids
作者:R. M. Dodson、Arthur H. Goldkamp、R. D. Muir
DOI:10.1021/ja01500a054
日期:1960.8
3-oxygenated 4-androstene-1, 17-diols and derivatives