Biocatalytic system for comparatively assessing the functional association of monolignol cytochrome P450 monooxygenases with their redox partners
Methods in Enzymology, ISSN: 0076-6879, Vol: 676, Page: 133-158
2022
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Article Description
Lignin is a complex heterogenous polymer derived from oxidative radical polymerization of three monolignols, i.e., p -coumaryl alcohol, coniferyl alcohol and sinapyl alcohol. These lignin monomeric precursors structurally differ in their methoxy groups of the benzene rings. In phenylpropanoid-monolignol biosynthetic pathway, the endoplasmic reticulum (ER)-resident cytochrome P450 monooxygenases, cinnamate 4-hydroxylase, coumaroyl ester 3′-hydroxylase and ferulate 5-hydroxylase, establish the key structural characteristics of monolignols. The catalysis of cytochrome P450 monooxygenase requires reducing power, which is supplied by the ER electron transfer chains, composed of cytochrome P450 oxidoreductase (CPR), cytochrome b 5 reductase (CBR) and/or cytochrome b 5 protein (CB5), from cofactor NADPH or NADH. While NADPH-dependent CPR serves as the typical electron donor for most P450 enzymes, in some cases, the CBR-CB5 or CPR-CB5 electron transfer system also transfers electrons to the terminal P450 enzymes. There are tremendous studies focusing on the discovery and characterization of cytochrome P450 monooxygenases. However, very limited attention has been paid to the versatility and the roles of electron transfer components in the P450 catalytic system. Due to the membrane-residence property of both P450 enzymes and electron transfer components, it is challenging to establish an effective experimental system to evaluate the functional association of P450s with their redox partners. This chapter describes a yeast cell biocatalytic system and the related experimental procedures for comparatively assessing the functional relationship of monolignol biosynthetic P450 enzymes and different redox partners in their catalysis.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0076687922002919; http://dx.doi.org/10.1016/bs.mie.2022.07.027; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85138532648&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/36280348; https://linkinghub.elsevier.com/retrieve/pii/S0076687922002919; https://dx.doi.org/10.1016/bs.mie.2022.07.027
Elsevier BV
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