Oxidation of Indole-3-acetic Acid by Dioxygen Catalysed by Plant Peroxidases: Specificity for the Enzyme Structure
Overview
Affiliations
Indole-3-acetic acid (IAA) can be oxidized via two mechanisms: a conventional hydrogen-peroxide-dependent pathway, and one that is hydrogen-peroxide-independent and requires oxygen. It has been shown here for the first time that only plant peroxidases are able to catalyse the reaction of IAA oxidation with molecular oxygen. Cytochrome c peroxidase (CcP), fungal peroxidases (manganese-dependent peroxidase, lignin peroxidase and Arthromyces ramosus peroxidase) and microperoxidase were essentially inactive towards IAA in the absence of added H2O2. An analysis of amino acid sequences allowed five structurally similar fragments to be identified in auxin-binding proteins and plant peroxidases. The corresponding fragments in CcP and fungal peroxidases showed no similarity with auxin-binding proteins. Five structurally similar fragments form a subdomain including the catalytic centre and two residues highly conserved among 'classical' plant peroxidases only, namely His-40 and Trp-117. The subdomain identified above with the two residues might be responsible for the oxidation of the physiological substrate of classical plant peroxidases, IAA.
Libao C, Minrong Z, Zhubing H, Huiying L, Shuyan L BMC Genomics. 2020; 21(1):653.
PMID: 32967611 PMC: 7510093. DOI: 10.1186/s12864-020-07046-3.
Kolwek J, Behrens C, Linke D, Krings U, Berger R J Ind Microbiol Biotechnol. 2017; 45(2):89-101.
PMID: 29270883 DOI: 10.1007/s10295-017-1998-9.
De A, Dey N, Adak M Physiol Mol Biol Plants. 2016; 22(3):371-380.
PMID: 27729723 PMC: 5039163. DOI: 10.1007/s12298-016-0375-x.
Kawano T, Kagenishi T, Kadono T, Bouteau F, Hiramatsu T, Lin C Commun Integr Biol. 2016; 8(6):e1000710.
PMID: 27066179 PMC: 4802810. DOI: 10.1080/19420889.2014.1000710.
Recombinant horseradish peroxidase variants for targeted cancer treatment.
Bonifert G, Folkes L, Gmeiner C, Dachs G, Spadiut O Cancer Med. 2016; 5(6):1194-203.
PMID: 26990592 PMC: 4924378. DOI: 10.1002/cam4.668.