ДНҚ топоизомеразалары: құрылымы, түрлері және функциялары

Class of enzymes

DNA topoisomerases (or topoisomerases) are enzymes that catalyze changes in the topological state of DNA, interconverting relaxed and supercoiled forms, linked (catenated) and unlinked species, and knotted and unknotted DNA. Topological issues in DNA arise due to the intertwined nature of its double helical structure, which, for example, can lead to overwinding of the DNA duplex during DNA replication and transcription. If left unchanged, this torsion would eventually stop the DNA or RNA polymerases involved in these processes from continuing along the DNA helix. A second topological challenge results from the linking or tangling of DNA during replication. Left unresolved, links between replicated DNA will impede cell division. The DNA topoisomerases prevent and correct these types of topological problems. They do this by binding to DNA and cutting the sugar phosphate backbone of either one (type I topoisomerases) or both (type II topoisomerases) of the DNA strands. This transient break allows the DNA to be untangled or unwound, and, at the end of these processes, the DNA backbone is resealed. Since the overall chemical composition and connectivity of the DNA do not change, the DNA substrate and product are chemical isomers, differing only in their topology.

The first DNA topoisomerase was discovered in bacteria by James C. Wang in 1971 and was initially named ω (omega) protein; it is now called Escherichia coli (E. coli) topoisomerase I (topo I) and is a representative of the type IA family of enzymes. Subsequently, a similar activity was found in eukaryotic cells (rat liver) by James Champoux and Renato Dulbecco; the enzyme responsible, eukaryotic topo I, has a distinct mechanism and is representative of the type IB family. The first type II topoisomerase to be discovered was DNA gyrase from bacteria, by Martin Gellert and coworkers in 1976, and also characterized by Nicholas Cozzarelli and co workers. DNA gyrase catalyzes the introduction of negative supercoils into DNA and is the only type II enzyme to do this, all the others catalyze DNA relaxation. Type II enzymes are mechanistically distinct from type I in being ATP dependent and transiently cleaving both DNA strands rather than just one. Type II topoisomerases were subsequently identified from bacterial viruses and eukaryotes. Topo EC codes are as follows: ATP independent (type I), EC 5.6.2.1; ATP dependent (type II): EC 5.6.2.2. The exception among the type I topoisomerases, reverse gyrase, which contains a helicase domain (EC 3.6.4.12) and introduces positive supercoiling in an ATP dependent manner. Therefore it is the sole type I topoisomerase classified as EC 5.6.2.2 (Table 1).

The double helical structure of DNA involves the intertwining of the two polynucleotide strands around each other, which potentially gives rise to topological problems. DNA topology refers to the crossing of the two DNA strands that alters the twist of the double helix and gives rise to tertiary conformations of DNA, such as supercoils, knots and catenanes. Potential topological issues associated with the double helical structure of DNA were recognized soon after its structure was first elucidated in 1953 by James Watson, Francis Crick and Rosalind Franklin and developed further by the work of Max Delbruck and John Cairns. Closed circular double stranded DNA can be described by 3 parameters: Linking number (Lk), Twist (Tw) and Writhe (Wr) (Fig. 1). Where Lk refers to the number of times the two strands are linked, Tw refers to the number of helical turns in the DNA, measured relative to the helical axis, and Wr quantifies the coiling of the path of the DNA helix in space and is often equated with 'supercoiling'. The 3 parameters are related as follows: Lk = Tw +Wr. This is a mathematical identity originally obtained by Călugăreanu in 1959 and is referred to as the Călugăreanu, or Călugăreanu–White–Fuller, theorem. Lk cannot be altered without breaking one or both strands of the helix; Tw and Wr are interconvertible and depend upon the solution conditions. Supercoiling is a vernacular term for DNA with a non zero linking difference, more correctly referred to as specific linking difference (σ = ΔLk/Lk0, where Lk0 is the mean linking number of the relaxed DNA circle). DNA is said to be positively supercoiled if Lk of it is higher than Lk0 for the relaxed state (Lk Lko = ΔLk, ΔLk>0); that means that Tw and/or Wr are increased relative to the relaxed molecule. Conversely, DNA is negatively supercoiled if Lk of the molecule is lower than the Lk0 (ΔLk<0). The consequences of topological perturbations in DNA are exemplified by DNA replication during which the strands of the duplex are separated; this separation leads to the formation of positive supercoils (DNA overwinding or overtwisting) ahead of the replication fork and intertwining of the daughter strands (precatenanes) behind (Fig. 2). If the positive supercoils are not relaxed, progression of the replication fork is impeded, whereas failure to unlink the daughter strands prevents genome segregation, which is required for cell division. Transcription by RNA polymerase also generates positive supercoiling ahead of, and negative supercoiling behind, the transcriptional complex (Fig. 2). This effect is known as the twin supercoiled domain model, as described by Leroy Liu and James Wang in 1987. These topological perturbations must be resolved for DNA metabolism to proceed, allowing the cell to efficiently replicate, transcribe and partition the genome to enable cellular division and vitality. Knots in DNA can be found in bacteriophages and as products of recombination reactions. Furthermore, compaction of the E. coli genome is achieved in part by negative supercoiling. [[File:Topological ramifications of DNA replication and transcription. jpg|thumb|286x286px|Figure 2. Topological consequences of DNA metabolism. i) During DNA replication, strand separation leads to positive supercoiling ahead of the advancing protein machinery, and precatenane formation behind. Precatenanes form as the newly synthesised duplexes wrap around one and other, and, if not removed prior to complete of replication, catenated DNA molecules are formed. ii) During transcription, strand separation leads to positive supercoiling ahead of the advancing protein machinery, and negative supercoil formation behind.

Type IA are monomeric and bind to single stranded segments of DNA. They introduce a transient single stranded break through the formation of a tyrosyl phosphate bond between a tyrosine in the enzyme and a 5′ phosphate in the DNA. The segment of DNA within which the break occurs is called the 'gate' or G segment, and its cleavage allows the passage of another segment of DNA, the 'transport' or T segment, to be passed through in a 'strand passage' process. This is followed by ligation of the G segment. For strand passage to occur, topo IA must undergo a conformational change to open the DNA gate and allow T segment transfer. During a DNA relaxation reaction this process changes the linking number of the DNA by +/ 1 (Fig. 4). Examples of type IA topoisomerases include prokaryotic topo I and III, eukaryotic topo IIIα and IIIβ and the archaeal enzyme reverse gyrase. Reverse gyrase, which occurs in thermophilic archaea, comprises a type IA topo coupled to a helicase, and is the only known enzyme that can introduce positive supercoils into DNA. left|thumb|Figure 4. Strand passage mechanism for type IA topos. (1) Topo binds the G segment ssDNA region, (2) the G segment is cleaved. (3) The topo DNA gate is opened, (4) which allows T segment transfer through the cleaved G strand. (5) The DNA gate is closed, (6) and the G strand is re ligated, changing the linking number by 1. (7) The topo can then go through another round of relaxation or dissociate from the DNA. Type IA topo (domains 1 4) is in pink, the active site tyrosine is yellow and the DNA is grey.|236x236px

Type IB topoisomerases catalyze reactions involving transient single stranded breaks in DNA through the formation of a tyrosyl phosphate bond between a tyrosine in the enzyme and a 3′ phosphate in the DNA. Rather than utilizing a strand passage mechanism, these enzymes operate via a 'swivel' or 'controlled rotation' of the cleaved strand around the intact strand. This controlled rotation mechanism was first described for Vaccinia topo I and permits DNA rotation of the free end around the intact strand, the speed being controlled by 'friction' within the enzyme cavity, before the nick is re ligated (Fig. 3). This results in a variable change of linking number per cleavage and religation event. This mechanism is distinct from that of the type IA enzymes, and the two groups of enzymes are structurally and evolutionarily unrelated. Examples of type IB topoisomerases include eukaryotic nuclear and mitochondrial topo I in addition to viral topo I, though they have been identified in all three domains of life.

Type IC topoisomerases share a similar mechanism to the type IB enzymes but are structurally distinct. The sole representative is topo V, found in the hyperthermophile Methanopyrus kandleri.

Type II topoisomerases catalyze changes in DNA topology via transient double stranded breaks in DNA. Reactions occur on double stranded DNA substrates and proceed via a strand passage mechanism (Fig. 5). The range of reactions include DNA relaxation, DNA supercoiling, unknotting, and decatenation. Whereas all type II topoisomerases can catalyze DNA relaxation, gyrase, an archetypal bacterial topoisomerase, can also introduce negative supercoils. In contrast to type I topoisomerases that are generally monomeric, type II topoisomerases are homodimers or heterotetramers. They are classified into two subtypes based on evolutionary, structural, and mechanistic considerations. The general strand passage mechanism for the type II topos begins with the binding of one DNA duplex, termed the gate segment (G segment), at the DNA gate. Another duplex, termed the transport segment (T segment), is captured by an ATP operated clamp and passed through a transient break in the G segment, involving 5ʹ phosphotyrosine linkages in both strands, before it is released through the C gate and the G segment is re ligated (Fig. 5). Enzyme turnover requires the binding and hydrolysis of ATP. thumb|325x325px|Figure 5. Type II topoisomerase strand passage mechanism. (1) G segment is bound at the DNA gate and the T segment is captured. (2) ATP binding stimulates dimerization of the N gate, the G segment is cleaved and the T segment is passed through the break. (3) The G segment is re ligated and the T segment exits through the C gate. For type IIB topos, there is no C gate so once the T segment passes through the G segment, it is released from the enzyme. (4) Dissociation of ADP and Pi allows N gate opening, a scenario where the enzyme either remains bound to the G segment, ready to capture a successive T segment, or (5) dissociates from the G segment.

Type IIA topoisomerases catalyze transient double stranded breaks in DNA through the formation of tyrosyl phosphate bonds between tyrosines in the enzyme (one on each subunit) and 5′ phosphates staggered by 4 bases in opposite DNA strands. The strand passage reaction can be intra or intermolecular (Fig. 5), thus permitting changes in supercoiling and knotting, or unlinking, respectively. This process changes the linking number of the DNA by +/ 2. Examples of type IIA topoisomerases include eukaryotic topo IIα and topo IIβ, in addition to bacterial gyrase and topo IV. DNA gyrase conforms to the same double strand passage mechanism as other type II enzymes but has unique features connected with its ability to introduce negative supercoils into DNA. The G segment is part of a much longer piece of DNA (>100 bp) that is wrapped around the enzyme, one arm of which forms the T segment that is passed through the double stranded break (Fig. 5). In the case of gyrase, a substantial amount of the free energy from ATP hydrolysis is transduced into torsional stress in DNA, i. e. supercoiling is an energy requiring process. Further, in the absence of ATP, gyrase is able to remove negative supercoils in a slower DNA relaxation reaction.

Type IIB also catalyze transient double stranded breaks through the formation of tyrosyl phosphate bonds between tyrosines in the enzyme and 5′ phosphates in opposite strands of the DNA, but in the case of IIB enzymes the double stranded breaks have a 2 base stagger. Type IIB enzymes show important structural differences, but are evolutionarily related to the type IIA enzymes. These differences include the lack of one of the protein 'gates' (the C gate) (Fig. 5). Originally found in archaea, they have also been found in eukaryotes, and, in particular, in plants; examples include topo VI and topo VIII. Topo VI is the best studied enzyme of this sub type and is thought to be a preferential decatenase.

For the non specialist perhaps the most important aspect of topoisomerases is their role as drug targets both for antibacterial and anti cancer chemotherapy; several topoisomerase targeted antibacterial and anti cancer drugs are listed among the 2019 World Health Organization Model List of essential Medicines. The reason for this prominence is that their reactions proceed via transient breaks in DNA, which, if stabilized by drug binding, can lead to cell death due to the generation of toxic single or double stranded breaks in genomic DNA. The majority of topo targeted drugs act in this way, i. e. they stabilize the enzyme DNA covalent cleavage intermediate.

Although type I topos, such as bacterial topo I, are viable antibiotic targets, there are currently no compounds in clinical use that target these enzymes. However, the type II enzymes, DNA gyrase and DNA topoisomerase IV, have enjoyed enormous success as targets for the widely used fluoroquinolone antibiotics, (Fig. 6).

Quinolone antibacterial compounds were first developed in the 1960s and have been in clinical use since the 1980s. FQ derivatives, such as ciprofloxacin, levofloxacin and moxifloxacin (Fig. 6) have been highly successful. These compounds work by interacting with their target (gyrase or topo IV) and DNA at the cleavage site to stabilize the DNA protein covalent cleavage intermediate. Specifically, they intercalate into the DNA and prevent the DNA religation step of the topoisomerase reaction (Fig. 5). This is a highly effective mechanism of inhibition that is also used by several topoisomerase targeted anti cancer drugs. Despite their spectacular success, resistance to FQs is a serious problem. work in a similar manner and it is hoped that some of these will replace FQs in the future.

Aminocoumarins (Fig. 6), such as novobiocin, clorobiocin and coumermycin A1, are natural products from Streptomyces that inhibit the ATPase reaction of gyrase and topo IV. that stabilize the cleavage complex, in a similar manner to FQs. Although these proteins are not viable as antibacterials, their mode of action could inspire the development of novel antibacterial compounds. Other protein inhibitors of gyrase prevent DNA binding by the topoisomerase rather than stabilizing cleavage complexes. These include YacG and pentapeptide repeat proteins, such as QnrB1 and MfpA; these protein inhibitors also confer resistance to fluoroquinolones. thumb|Figure 6. Structures of antibiotic compounds that target bacterial DNA gyrase and topoisomerase IV.

Both human topo I and topo II (both α and β isoforms) can be targeted in anticancer chemotherapy (Fig. 7). Most of these compounds act in a similar way to FQs, i. e. by stabilizing the DNA protein covalent cleavage complex; for this they have become known as topoisomerase poisons, distinct from catalytic inhibitors. Several human topoisomerase inhibitors are included on the World Health Organization's List of Essential Medicines.

Camptothecin (Fig. 7), originally derived from the tree Camptotheca acuminata, targets human topo I and derivatives such as topotecan and irinotecan are widely used in cancer chemotherapy.

At least one topoisomerase, DNA topoisomerase II beta (topo IIβ), has a regulatory role in gene transcription. Topo IIβ–dependent double strand DNA breaks and components of the DNA damage repair machinery are important for rapid expression of immediate early genes, as well as for signal responsive gene regulation. Topo IIβ, with other associated enzymes,