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Structure of the fungal hydroxylase, CYP505A30, and rational transfer of mutation data from CYP102A1 to alter regioselectivity

DOI: 10.1039/D1CY01348C DOI Help

Authors: Jasmin Cara Aschenbrenner (University of the Free State; University of Cape Town) , Ana C. Ebrecht (University of the Free State) , Carmien Tolmie (University of the Free State) , Martha Sophia Smit (University of the Free State; University of Cape Town) , Diederik J. Opperman (University of the Free State)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Catalysis Science & Technology

State: Published (Approved)
Published: October 2021
Diamond Proposal Number(s): 20303

Open Access Open Access

Abstract: CYP505A30 is a fungal, self-sufficient cytochrome P450 monooxygenase that can selectively oxyfunctionalise n-alkanes, fatty alcohols, and fatty acids. From alkanes, it produces a mixture of non-vicinal diols by two sequential hydroxylation reactions. Here we report the structure of the haem domain of CYP505A30, the first structure for a member of the CYP505 family, with dodecanoic acid bound within the active site. Overall, a high structural similarity to the related bacterial CYP102A1 was observed, despite low sequence identity (<40 %). Comparison of the active sites, however, showed a high degree of conservation with only two amino acid differences close to the haem. Stabilisation of the acid substrate in CYP505A30 also occurs, as in CYP102A1, via an arginine residue. However, compared to R47, which is situated in the β1 region of CYP102A1, R358 is located in the β3 region of CYP505A30. We furthermore created mutants to test if it is possible to rationally transfer the knowledge on active site mutations in CYP102A1 to change the regioselectivity of CYP505A30. The introduction of F93V, I334F mutations resulted in increased ω-1 (C2) regioselectivity, similar to CYP102A1 328-87, of more than 80 % for n-octane and 90 % for n-decane. Changing residues to resemble the 102A1 wildtype increased the regioselectivity towards ω-2 (C3) to over 60 % for both substrates. The knowledge gained from this study unlocks a more selective production of symmetrical non-vicinal diols from n-alkanes.

Diamond Keywords: Enzymes

Subject Areas: Biology and Bio-materials, Chemistry

Instruments: I04-Macromolecular Crystallography

Added On: 14/10/2021 10:00


Discipline Tags:

Catalysis Engineering & Technology Biotechnology Life Sciences & Biotech Structural biology Chemistry Biochemistry

Technical Tags:

Diffraction Macromolecular Crystallography (MX)