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Minerdi, D.; Savoi, S.; Sabbatini, P. The Role of Cytochromes P450 in Plants. Encyclopedia. Available online: https://encyclopedia.pub/entry/42562 (accessed on 25 November 2024).
Minerdi D, Savoi S, Sabbatini P. The Role of Cytochromes P450 in Plants. Encyclopedia. Available at: https://encyclopedia.pub/entry/42562. Accessed November 25, 2024.
Minerdi, Daniela, Stefania Savoi, Paolo Sabbatini. "The Role of Cytochromes P450 in Plants" Encyclopedia, https://encyclopedia.pub/entry/42562 (accessed November 25, 2024).
Minerdi, D., Savoi, S., & Sabbatini, P. (2023, March 27). The Role of Cytochromes P450 in Plants. In Encyclopedia. https://encyclopedia.pub/entry/42562
Minerdi, Daniela, et al. "The Role of Cytochromes P450 in Plants." Encyclopedia. Web. 27 March, 2023.
The Role of Cytochromes P450 in Plants
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This entry is adapted from the peer-reviewed paper 10.3390/ijms24054695

Cytochromes P450 are ancient enzymes diffused in organisms belonging to all kingdoms of life, including viruses, with the largest number of P450 genes found in plants. The functional characterization of cytochromes P450 has been extensively investigated in mammals, where these enzymes are involved in the metabolism of drugs and in the detoxification of pollutants and toxic chemicals.

grapevine cytochrome P450 enzyme

1. Cytochromes P450 Enzymes: General Features

Cytochromes P450 (P450s or CYPs) are heme–thiolate terminal monooxygenases that transfer one atom from molecular oxygen to X–H bonds, where X may be the -C, -N, or S of a substrate, with a concomitant reduction in the remaining oxygen atom to water [1]. The CYP-mediated molecular oxygen activation gives rise to ketones, alcohols, aldehydes, epoxides, and carboxylic acids. Radicals or reactive oxygenated intermediates generated by CYPs can also lead to the formation of oxidative C–C bond cleavage [2], dealkylation [3], desaturation [4], dehydration [5], the oxidative rearrangement of carbon skeletons [6], and decarboxylation [7]. CYPs are a large superfamily of enzymes that show an absorbance peak at 450 nm when their heme is reduced and complexed with carbon monoxide. These enzymes were discovered in 1958, while studying the spectrophotometric properties of pigments in a microsomal fraction of rat livers [8]. A few years later, it was demonstrated that this pigment is a heme-containing protein, and it was called “P-450” (P for pigment) [9]. The heme group plays essential roles in catalysis, providing the P450s’ carbon monoxide-binding ability; moreover, the signature sequence FxxGxxxCxG in the heme-binding domain functions as the fifth ligand to the heme iron. CYPs are ancient enzymes that are extensively diffused in the organisms of all kingdoms of life (Figure 1), including viruses [10], with the largest number of P450 genes being present in plants [11]. Plant P450s are classified into the A-type group and are involved in plant-specific biochemical pathways [12]. The non-A-type P450 enzymes [13] form distinct clades and are more closely related to non-plant P450 enzymes than to the A-type. CYPs are classified into families on the basis of the sequence identity of their amino acid sequences, and the symbol CYP is the root followed by an Arabic numeral representing family therefore, the subfamily is indicated by a letter and the gene is represented by a number [14]. The features and functions of P450 enzymes have been studied from bacteria to mammals (see http://drnelson.uthsc.edu/CytochromeP450.html, accessed on 15 November 2022) [14]. Human P450 enzymes metabolize drugs and synthesize endogenous compounds essential for human physiology. Often, alterations in specific P450s affect the biological processes that they mediate, leading to a disease [15].
Ijms 24 04695 g001
Figure 1. Diffusion of cytochrome P450 enzyme in the kingdom of Life.

2. Cytochrome P450 Reactivity

CYPs, through the activation of molecular oxygen, are able to monooxygenate the substrate, followed by the insertion of a single atom of oxygen into an organic substrate and a reduction in the another oxygen atom to water according to the following scheme:
RH + O2 + NAD(P)H + H+ → ROH + H2O + NAD(P)+
NAD(P)H supplies electron equivalents through an electron transfer chain that involves different redox partners, the nature of which is utilized to classify cytochromes P450 into 10 classes [16]. The organic substrate (R) binds to the heme group of the enzyme and this binding allows the transfer of an electron from NADPH through cytochrome P450 reductase (CPR) to the hem domain that reduces the iron (Fe) from the ferric state (Fe3+) to the ferrous state (Fe2+). The molecular oxygen binds to ferrous P450, forming a ferrous CYP–dioxygen complex, and the second electron is transferred from CPR to the ferrous CYP–dioxygen complex, forming the peroxo complex, and this complex is rapidly protonated twice to form one molecule of water and an iron–oxo complex. The oxidized reaction product (RO) is formed during the last step of the catalytic cycle when the atom of oxygen in the iron–oxo complex binds to the organic substrate (R) [17] (Figure 2).
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Figure 2. Catalytic cycle of cytochrome P450 enzyme.

3. The Role of Cytochromes P450 in Plants

In plant cytochromes, P450 enzymes are present in several organelles and organs, namely, the endoplasmic reticulum, mitochondria, and chloroplast [18]. They are also found in shoot, bulbs, hypocotyl, roots, and the endosperm of germinating seeds. In both plants and animals, CYPs have an absorbance range from 447 to 452 nm and constitute the largest family of enzymes in the metabolism of a plant, where they are grouped into ten clans [19][20]. The most studied family is CYP51, with a pivotal role in regulating the synthesis of sterols [21] and triterpenes [22]. CYP71 impacts shikimate products and intermediates [23][24]. The CYP72 clan has a role in the catabolism of isoprenoid hormones [25], and the CYP74 synthetizes oxylipin derivatives and allene oxide in the octadecanoid and jasmonate pathways [26][27]. CYP85 participates in the metabolism of cyclic terpenes and sterols in the brassinosteroid and in abscisic acid and gibberellin pathways [28]. The CYP86 hydroxylates fatty acids [29], the CYP97 hydroxylates carotenoids [30], and CYP710 control the synthesis of sterol C-22 desaturase [5]. The CYP450 family in plants has a molecular mass between 45 and 62 kDa [4][31][32]. In plants, P450 enzymes are involved in the biosynthesis of structural polymers, defense against pathogen infection, communication with other organisms, hormonal signaling, herbicide resistance, and stress tolerance (Figure 3).
Ijms 24 04695 g003
Figure 3. Role of cytochrome P450 enzyme in plants.
Plant hormone metabolism is also regulated by cytochrome P450 enzymes that control cell division and cell expansion, vascular differentiation, fruit growth, root development, and flower formation. Cytochromes P450 protect plants from dehydration [3], UV stress [33], and drought [34]. Moreover, P450s play a role in physiological process, such as detoxification, adaptation responses to heavy metals, salts, and chemicals (e.g., herbicides) [35][36]. In addition, many P450s participate in the biosynthesis of cell wall components [37]. CYP97 engages in the biosynthetic pathway of xanthophylls, hydroxylating the beta and gamma rings of carotenoids [38] (Table 1).
Table 1. Role of cytochrome P450 enzyme in crop plants.
Plant P450 Function Reference
Solanum lycopersicum CYP789A Fruit size
Plant architecture		 [39]
Solanum tuberosum CYP72A208
CYP188		 Glycolakaloid biosynthesis [40]
Oryza sativa CYP703A3 Male fertility [41]
Cucumis sativus CYP88L2
CYP81Q58
CYP78D20		 Synthesis of cucurbitacin [42][43]
Maesa lanceolata CYP72A
CYP76A		 Synthesis of triterpenes [22][44]
Olea europea CYP72 Synthesis of secoxy-iridoids [45]
Malus domestica CYP716A
CYP175		 Synthesis of triterpenic acids [46]
Sorghum bicolor CYP97C1
CYPP97A3		 Synthesis of lutein [32]
In Solanum lycopersicum, the CYP78 subfamily modulates the number and length of the lateral shoots and fruit ripening time [39]. In Solanum tuberosum, CYP72 is involved in the biosynthesis of two steroidal glycoalkaloids that catalyze the 26- and 22-hydroxylation steps. The knockdown plants of CYP72 are sterile, and tubers do not sprout during storage.
Tuber sprouting and the biosynthesis of glycoalkaloid in potatoes, two traits that significantly impact potato breeding and are important for the industry, can be controlled by tools provided by the functional analyses of the CYP72 family [40]. The cuticle of anther and the pollen exine are protective envelopes of the male gametophyte and the pollen grain. The fatty acid hydroxylase CYP703 is essential for male fertility in rice because the CYP703A3-2 mutant shows that pollen exine is defective and that the anthers exhibit a reduced level of cutin monomers and wax components [41]. Cucumber and melon contain cucurbitacins, highly oxygenated triterpenoids responsible for the bitter taste [47]. Cucurbitacins derive from the tetracyclic triterpenoid cucurbitadienol that is further oxidized to cucurbitacin at different positions by CYP81 and CYP87 [42][43][48] and CYP72 and CYP71 [22][44]. In Olea europaea, CYP72 catalyzes the oxidative C–C bond cleavage in the biosynthesis of secoxy-iridoids, a series of phenolic compounds that are essential for the flavor and quality of olive oil [45]. CYP716 is involved in the biosynthesis of the triterpenic acids present in apple fruit [46], and CYP97 is involved in the biosynthetic pathway of lutein in Sorghum [32].

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Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Daniela Minerdi
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Stefania Savoi
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Paolo Sabbatini
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