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Ramírez-Gamboa, D.;  Díaz, A.L.;  Meléndez-Sánchez, E.;  Reyes-Pardo, H.;  Villaseñor-Zepeda, K.R.;  López-Arellanes, M.E.;  Sosa-Hernández, J.E.;  Coronado-Apodaca, K.G.;  Gamez-Mendez, A.M.;  Afewerki, S.; et al. Photolyase. Encyclopedia. Available online: https://encyclopedia.pub/entry/27546 (accessed on 01 December 2024).
Ramírez-Gamboa D,  Díaz AL,  Meléndez-Sánchez E,  Reyes-Pardo H,  Villaseñor-Zepeda KR,  López-Arellanes ME, et al. Photolyase. Encyclopedia. Available at: https://encyclopedia.pub/entry/27546. Accessed December 01, 2024.
Ramírez-Gamboa, Diana, Ana Laura Díaz, Edgar Meléndez-Sánchez, Humberto Reyes-Pardo, Karen Rocio Villaseñor-Zepeda, Miguel E. López-Arellanes, Juan Eduardo Sosa-Hernández, Karina G. Coronado-Apodaca, Ana Maria Gamez-Mendez, Samson Afewerki, et al. "Photolyase" Encyclopedia, https://encyclopedia.pub/entry/27546 (accessed December 01, 2024).
Ramírez-Gamboa, D.,  Díaz, A.L.,  Meléndez-Sánchez, E.,  Reyes-Pardo, H.,  Villaseñor-Zepeda, K.R.,  López-Arellanes, M.E.,  Sosa-Hernández, J.E.,  Coronado-Apodaca, K.G.,  Gamez-Mendez, A.M.,  Afewerki, S.,  Iqbal, H.M.N.,  Parra-Saldivar, R., & Martínez-Ruiz, M. (2022, September 23). Photolyase. In Encyclopedia. https://encyclopedia.pub/entry/27546
Ramírez-Gamboa, Diana, et al. "Photolyase." Encyclopedia. Web. 23 September, 2022.
Photolyase
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Photolyase is a protein that has various functions, among which is the repair of DNA damaged from exposure to UV rays from the sun.

Photolyase DNA Repair Enzyme Topical applications

1. Introduction

The presence of photolyases has been observed in fish, amphibians, birds, and a few marsupials [1]; nevertheless, in higher plants and animals, the ability to repair DNA was lost during evolution (Figure 1). Therefore, their function is limited to regulating growth and acting as blue-light photoreceptors; these enzymes are known as cryptochromes [2].
Figure 1. Presence of photolyase in different organisms. Due to evolution, some species lost the ability to repair DNA. Created with BioRender.com.
The first precedent of enzymes with photolyase-like activity was discovered in 1993 in a plant of the Brassicaceae family native to Europe, Arabidopsis thaliana [3]. In other plants such as white mustard (Sinapis alba), the same photolyase cofactors are present; however, these plants lack DNA repair activity [4]. However, the photoreactivation process and DNA repair with photolyase are available and have been demonstrated in Streptomyces griseus [5] and bacteriophages [6].
In cyanobacteria, the existence of photolyase is reported in Anacystis nidulans [7]. The activity of photolyase enzymes has been reported mainly in environments with high exposure to UV rays, such as the case of twelve species of diatoms from Antarctica that demonstrated a DNA repair response to UV radiation damage [8].
In eukaryotic organisms, the Antarctic alga Chlamydomonas sp. ICE-L, which is developed in high-irradiation environments, can use mechanisms that reduce UV radiation damage [9].

2. Type of Enzyme

Photolyases are monomeric proteins with a molecular mass from 50 to 61 kDa. They are made up of 450–550 amino acids and two unsorted covalently bound chromophores as cofactors. One of the cofactors is always flavin adenine dinucleotide FAD, and the second is methenyltetrahydrofolate (MTHF) or 8-hydroxy-7, 8-didemethyl-5-deazariboflavin (8-HDF) [10]. Light is an indispensable resource in the photoreactivation process for the conversion of enzyme–substrate complexes into additional DNA repair products [11]. The surface of photolyases is characterized by a positive charge near the substrate binding which promotes the interaction with DNA [12]. The structure of photolyase consists of two domains: a C-terminal α-helical catalytic domain that contains the flavin cofactor and an N-terminal α/β domain [13].
The superfamily of chromophores/photolyases (CRY/PHR) consists of subfamilies (Figure 2) [14][15], of which there are three types of photolyases that have been identified to repair a specific type of dimer: (1) CPD photolyase, responsible for repairing CPD, (6-4); (2) photolyase, which repairs (6-4) pyrimidine pyrimidone; and (3) cryptochrome-DASH, which causes a variety of physiological changes to DNA [16][17].
Figure 2. Integration of the CRY/PHR superfamily and the emergence of subfamilies due to evolutionary changes. The main distinctions are the ability to repair specific DNA and loss of photorepair capacity. Created with BioRender.com.

3. Photolyase and Microorganisms

Photolyase biosynthesis begins with the transfer of an electron from the anionic chromophore FADH, promoted by light. In a catalytically active form, this binds to damaged DNA in a high-affinity, light-independent step [18][19].
To study numerous characteristics of the photolyases obtained from various organisms such as structural, physical, and mechanical properties, researchers have employed genetic manipulation approaches to promote the overexpression of DNA repair enzymes, since biosynthesis naturally provides low concentrations. Subsequently, extraction and purification processes are performed to obtain better quality enzymes (Table 1) [20]. After these steps, generally, between 15 and 25 mg of photolyase with a purity greater than 98% is obtained. The quality of the enzyme obtained is reflected in the color of the extract: a dark blue color indicates a good quality product. Therefore, it is important to measure and quantify the absorbance spectrum after enzyme purification [20].

4. DNA Damage by UV Irradiation

The organisms and cells that inhabit the earth naturally are continuously exposed to genotoxic agents present in the environment. Sunlight, as a source of UV rays, is one of the main genotoxic agents; nonetheless, it is essential for the development of life, for example, in the process of photosynthesis [31].
The damage caused by exposure to UV radiation can trigger various skin reactions, mainly (as mentioned before) by affecting pyrimidine dimers; erythema, immunosuppression, and melanogenesis are just some of the disorders that can occur. Hence, it has been proven that overexposure to sunlight almost irreversibly damages skin cells [32].

5. Photolyase Mechanism of Action

There are multiple mechanisms of DNA repair: direct reversal [33], base excision, nucleotide excision [34], mismatch [35], single-strand break, and double-strand break repair [36].
Photolyases are light-driven DNA repair enzymes which function specifically in the reversal of genomic lesions induced by UV radiation [37]. An important DNA repair mechanism for mutagenic and cytotoxic UV-induced photolesions in DNA is photoreactivation, which utilizes enzyme photolyase for reverting modified nitrogenous bases into normal form, employing blue wavelength [38]. DNA repair to minimize mutagenic changes is divided into two main mechanisms: single-strand (ss) and double-strand (ds) DNA damage repair. In the same way, ss and ds DNA repair are divided into direct reversal repair, nucleotide excision repair, base excision repair, and mismatch repair for ss DNA repair and homologous recombination and non-homologous end-joining repairs for ds DNA repairs [39].
The photolyase for the CPD and 6-4PP lesions can be divided into CPD photolyases based on the photoproduct that they recognize, which are subdivided in relation to the amino acid sequence they possess, and 6-4PP photolyases, respectively [40]. Photolyases can possess flavin adenine dinucleotide (FAD) in four different redox states: oxidized (FAD), anionic semiquinone (FAD), neutral semiquinone (FADH), and anionic hydroquinone (FADH) [39]. Different redox states will act differently in the absorption spectrum. While FAD and FAD mainly absorb UV-A, and blue light, FADH absorbs blue, green, and red light, and FADH does not absorb visible light. An absorption spectrum was determined from two organisms by following flavin intermediates during the catalytic process, showing the mode of action on the DNA repair by photolyase based on the absorption properties of FAD [41].
According to Wang et al. [41], DNA repair by photolyase can be divided into three steps: (i) Recognition, which is a light-independent process where CPD or (6-4) photoproduct in the damaged DNA forms a photolyase/DNA complex by flipping into the active site containing the flavin cofactor of the DNA photolyase. (ii) During the catalytic reaction [42] taking place when FAD is at a fully reduced state (FADH), the methenytetrahydrofolate (MTHF), a photolyase chromophore, transfers energy to FADH through the absorption of photons from the blue-light spectrum, changing FADH to an exciting form of FADH. In this step, CPD or the (6-4) photoproduct ring is opened by bond dissociation in the dimer radical anion, and electron transfers from FADH to the lesions occur [39][43]. (iii) Finally, the separation step completes the repair process by the departure of repaired DNA from photolyases.
As previously mentioned, FAD oxidation states influence the light absorption spectra; hence, catalytic reactions for DNA repair from FADH take place under blue-light conditions. Considering the poor permeability of living tissues to blue light, works that aim to remove the barrier of this range of light have been developed using harvesting or antenna chromophores. Antenna chromophores are utilized by some photolyase to gain the photoreception ability of a light range, and the development and application of artificial antenna chromophores demonstrate an increase of up to 1.5-fold in DNA repair activity. This is a promising strategy area for the optimization of photolyase DNA repair [43]. Nevertheless, reports on the application of artificial antenna chromophores remain scarce.

6. Immobilization and Biocarriers

Photolyase offers outstanding protection and recovery mechanisms against sunlight-induced DNA damage, but if the enzyme lacks the capacity of reaching the site where it should intervene, or lacks the stability necessary to complete this, its utilization will go to waste.
Currently, immobilization strategies such as the encapsulation of photolyases within liposomes are the most used method to stabilize and deliver the protein; nonetheless, other methods, such as the application of nanomaterials, are being explored [40]. There are an assortment of technologies and systems currently being used as an approach to deliver active ingredients in skincare, such as antioxidants that can be useful and might offer an alternative to liposomes. Some of these technologies include the use of different formulations, such as gels, hydrogels, and emulsions (micro and nano-emulsions), the usage of other vesicular delivery systems instead of liposomes, such as ethosomes, transfersomes, niosomes, and non-vesicular particles such as solid lipid nanoparticles, and nanostructured lipid carriers, polymeric nanoparticles, nanocrystals, and—lastly—carbon, metal, or metal oxide nanoparticles. These immobilization technologies seek to improve long-term stability and sensitivity in order to provide a better catalytic activity; however, it is necessary to explore their efficiency according to their final applications [44][45][46][47][48][49][50][51].

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