Adenosine kinase

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adenosine kinase
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EC no. 2.7.1.20
CAS no. 9027-72-9
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Adenosine kinase (AdK; EC 2.7.1.20) is an enzyme that catalyzes the transfer of gamma-phosphate from Adenosine triphosphate (ATP) to adenosine (Ado) leading to formation of Adenosine monophosphate (AMP). In addition to its well-studied role in controlling the cellular concentration of Ado, AdK also plays an important role in the maintenance of methylation reactions. [1] [2] [3] [4] [5] [6] [7] All S-adenosylmethionine-dependent transmethylation reactions in cells lead to production of S-adenosylhomocysteine (SAH), which is cleaved by SAH hydrolase into Ado and homocysteine. The failure to efficiently remove these end products (Ado removed by phosphorylation by AdK) can result in buildup of SAH, which is a potent inhibitor of all transmethylation reactions. [4] [8] [9] The disruption of AdK gene (-/-) in mice causes neonatal hepatic steatosis, a fatal condition characterized by rapid microvesicular fat infiltration, leading to early postnatal death. [6] The liver was the main organ affected in these animals and in it the levels of adenine nucleotides were decreased, while those of SAH were elevated. Recently, missense mutations in the AdK gene in humans which result in AdK deficiency have also been shown to cause hypermethioninemia, encephalopathy and abnormal liver function. [10]

Contents

Biochemical properties

AdK is a monomeric protein (~ 38-40 kDa), which works via an ordered Bi-Bi reaction mechanism. [7] [11] [12] [13] [14] [15] It belongs to the phosphofructokinase B (PfkB) family of sugar kinases. Other members of this family (also known as the RK family) include ribokinase (RK), inosine-guanosine kinase, fructokinase, and 1-phosphofructokinase. [7] [16] [17] The members of the PfkB/RK family are identified by the presence of three conserved sequence motifs. [7] [16] [18] The structures of AdK and several other PfK family of proteins have been determined from a number of organisms (see section below) [14] [15] as well as that for RK protein from E. coli. [19] Despite low sequence similarity between AdK and other PfkB family of proteins, these proteins are quite similar at structural levels. [7] Compounds that are substrates for AdK include the N-nucleosides toyocamycin, tubercidin and 6-methylmecaptopurine riboside; the C-nucleosides formycin A, 9-azadenosine, and a large number of other C- and N-nucleoside analogs. [20] [21] [22] The AdK from mammalian sources, in addition to carrying out ATP-dependent phosphorylation of Ado, also catalyzes an Ado-AMP exchange reaction requiring ADP. [11] [23] [24] This activity is an integral part of AdK [24] [25] and it presumably allows a rapid and precise control of Ado concentration in cells. [25] [26] The enzymatic activity of AdK from different sources show a marked dependence on phosphate (Pi) and/or pentavalent ions and it is a conserved property of the PfkB family of proteins. [18] [27] [28] The conserved NXXE motif, which is a distinctive property of the PfkB family of proteins, is involved in Pi (PVI) dependency. [18]

Evolution and Relationship to the PfkB Family of Proteins

The AdK gene/protein is mainly found in eukaryotic organisms [7] and its primary sequence shows a high degree of conservation (>55% aa similarity). However, AdK sequences exhibit low (~ 20-25%), but significant similarity to other PfkB family of proteins such as RK and phosphofructokinases, which are also found in prokaryotic organisms. [17] [29] [30] Although a protein exhibiting AdK activity has been reported in Mycobacterium tuberculosis, [31] sequence and biochemical characteristics of this enzyme reveal it to be an atypical enzyme that is more closely related to ribokinase and fructokinase (35%) than to other ADKs (less than 24%).

Gene and isoforms

The AdK gene in humans is located on chromosome 10 in the 10q11-10q24 region. [32] In contrast to its coding sequence (about 1 Kb), the AdK gene in mammalian species is unusually large (~546 Kb in humans) and it consists of 11 exons (36 to 173 bp in length) and 10 introns whose lengths vary from 4.2 Kb to 128.6 Kb (average ~50Kb). The ratio of the non-coding to coding sequence for human ADK (>550) is the highest known for any gene. The AdK gene in mammalian organisms is also linked in a head to head manner to the gene for the long isoform of AdK to the gene for μ3A adaptor protein, [33] [34] and both these genes are transcribed from a single bi-directional promoter. The large size of the AdK gene and its linkage to the gene for μ3A adaptor protein are apparently unique characteristic of the amniotes (e.g. various mammals, birds, and reptiles). In contrast, the AdK genes in other eukaryotic organisms are much smaller in lengths (1.3 – 20 Kb long). In mammals, two isoforms of Adk are present. [17] [35] [36] These two isoforms show no difference in their biological activity and they differ only at the N-terminus where the long isoform (AdK-long) contains extra 21 amino acids that replace the first 4 amino acids of the short isoform (AdK-short). [17] [35] [36] These two isoforms are independently regulated at the transcriptional level and the promoter for the short isoform is located within the first large AdK intron. [37] It was recently shown that of the two AdK isoforms, the AdK-long isoform is localized in the nucleus, whereas AdK-short is found in the cytoplasm. [38]

Cardio- and neuro-protective roles

AdK plays a central role in controlling the cellular levels of Ado, which via its interaction with adenosine receptors in mammalian tissues produces a broad range of physiological responses including potent cardioprotective and neuroprotective activities. [39] [40] [41] The overexpression of AdK in the brain, which leads to decreased Ado levels and loss of inhibition of neuronal excitability by astrocytes, has been proposed as the main underlying cause of progression of epilepsy. [42] [43] Hence, the modulation of AdK by external means provides an important strategy for harnessing its potential therapeutic benefits. As such, there is much interest in developing specific inhibitors of AdK. [44] [45] Many AdK inhibitors, some of which show useful analgesic, anti-seizure, and anti-inflammatory properties in animal models have been described. [44] [46] [47]

Studies with mutant mammalian cells

In cultured mammalian cells, mainly Chinese hamster ovary (CHO) cells, many kinds of mutants that are affected in AdK and show interesting differences in their genetic and biochemical properties have been isolated; [48] [34] [49] [50] One kind of mutant that is obtained at unusually high spontaneous mutant frequency (10−3-10−4) contain large deletions within the AdK gene that leads to the loss of several introns and exons. [33] [34] Many mutants that are affected in the expression of either the expressions of the two AdK isoforms have also been isolated. [41]

Related Research Articles

<span class="mw-page-title-main">Kinase</span> Enzyme catalyzing transfer of phosphate groups onto specific substrates

In biochemistry, a kinase is an enzyme that catalyzes the transfer of phosphate groups from high-energy, phosphate-donating molecules to specific substrates. This process is known as phosphorylation, where the high-energy ATP molecule donates a phosphate group to the substrate molecule. As a result, kinase produces a phosphorylated substrate and ADP. Conversely, it is referred to as dephosphorylation when the phosphorylated substrate donates a phosphate group and ADP gains a phosphate group. These two processes, phosphorylation and dephosphorylation, occur four times during glycolysis.

<span class="mw-page-title-main">Adenosine monophosphate</span> Chemical compound

Adenosine monophosphate (AMP), also known as 5'-adenylic acid, is a nucleotide. AMP consists of a phosphate group, the sugar ribose, and the nucleobase adenine. It is an ester of phosphoric acid and the nucleoside adenosine. As a substituent it takes the form of the prefix adenylyl-.

<span class="mw-page-title-main">Thymidine kinase</span> Enzyme found in most living cells

Thymidine kinase is an enzyme, a phosphotransferase : 2'-deoxythymidine kinase, ATP-thymidine 5'-phosphotransferase, EC 2.7.1.21. It can be found in most living cells. It is present in two forms in mammalian cells, TK1 and TK2. Certain viruses also have genetic information for expression of viral thymidine kinases. Thymidine kinase catalyzes the reaction:

<span class="mw-page-title-main">Adenylate kinase</span> Class of enzymes

Adenylate kinase is a phosphotransferase enzyme that catalyzes the interconversion of the various adenosine phosphates. By constantly monitoring phosphate nucleotide levels inside the cell, ADK plays an important role in cellular energy homeostasis.

<span class="mw-page-title-main">Nucleoside-diphosphate kinase</span> Class of enzymes

Nucleoside-diphosphate kinases are enzymes that catalyze the exchange of terminal phosphate between different nucleoside diphosphates (NDP) and triphosphates (NTP) in a reversible manner to produce nucleotide triphosphates. Many NDP serve as acceptor while NTP are donors of phosphate group. The general reaction via ping-pong mechanism is as follows: XDP + YTP ←→ XTP + YDP. NDPK activities maintain an equilibrium between the concentrations of different nucleoside triphosphates such as, for example, when guanosine triphosphate (GTP) produced in the citric acid (Krebs) cycle is converted to adenosine triphosphate (ATP). Other activities include cell proliferation, differentiation and development, signal transduction, G protein-coupled receptor, endocytosis, and gene expression.

<span class="mw-page-title-main">Phosphofructokinase 2</span> Class of enzymes

Phosphofructokinase-2 (6-phosphofructo-2-kinase, PFK-2) or fructose bisphosphatase-2 (FBPase-2), is an enzyme indirectly responsible for regulating the rates of glycolysis and gluconeogenesis in cells. It catalyzes formation and degradation of a significant allosteric regulator, fructose-2,6-bisphosphate (Fru-2,6-P2) from substrate fructose-6-phosphate. Fru-2,6-P2 contributes to the rate-determining step of glycolysis as it activates enzyme phosphofructokinase 1 in the glycolysis pathway, and inhibits fructose-1,6-bisphosphatase 1 in gluconeogenesis. Since Fru-2,6-P2 differentially regulates glycolysis and gluconeogenesis, it can act as a key signal to switch between the opposing pathways. Because PFK-2 produces Fru-2,6-P2 in response to hormonal signaling, metabolism can be more sensitively and efficiently controlled to align with the organism's glycolytic needs. This enzyme participates in fructose and mannose metabolism. The enzyme is important in the regulation of hepatic carbohydrate metabolism and is found in greatest quantities in the liver, kidney and heart. In mammals, several genes often encode different isoforms, each of which differs in its tissue distribution and enzymatic activity. The family described here bears a resemblance to the ATP-driven phospho-fructokinases; however, they share little sequence similarity, although a few residues seem key to their interaction with fructose 6-phosphate.

<span class="mw-page-title-main">Purine nucleoside phosphorylase</span> Enzyme

Purine nucleoside phosphorylase, PNP, PNPase or inosine phosphorylase is an enzyme that in humans is encoded by the NP gene. It catalyzes the chemical reaction

The Casein kinase 1 family of protein kinases are serine/threonine-selective enzymes that function as regulators of signal transduction pathways in most eukaryotic cell types. CK1 isoforms are involved in Wnt signaling, circadian rhythms, nucleo-cytoplasmic shuttling of transcription factors, DNA repair, and DNA transcription.

<span class="mw-page-title-main">Phosphofructokinase</span> Enzyme in glycolysis

Phosphofructokinase (PFK) is a kinase enzyme that phosphorylates fructose 6-phosphate in glycolysis.

<span class="mw-page-title-main">Deoxycytidine kinase</span> Protein-coding gene in the species Homo sapiens

Deoxycytidine kinase (dCK) is an enzyme which is encoded by the DCK gene in humans. dCK predominantly phosphorylates deoxycytidine (dC) and converts dC into deoxycytidine monophosphate. dCK catalyzes one of the initial steps in the nucleoside salvage pathway and has the potential to phosphorylate other preformed nucleosides, specifically deoxyadenosine (dA) and deoxyguanosine (dG), and convert them into their monophosphate forms. There has been recent biomedical research interest in investigating dCK's potential as a therapeutic target for different types of cancer.

<span class="mw-page-title-main">PRKCE</span> Protein-coding gene in the species Homo sapiens

Protein kinase C epsilon type (PKCε) is an enzyme that in humans is encoded by the PRKCE gene. PKCε is an isoform of the large PKC family of protein kinases that play many roles in different tissues. In cardiac muscle cells, PKCε regulates muscle contraction through its actions at sarcomeric proteins, and PKCε modulates cardiac cell metabolism through its actions at mitochondria. PKCε is clinically significant in that it is a central player in cardioprotection against ischemic injury and in the development of cardiac hypertrophy.

<span class="mw-page-title-main">PPP2CA</span> Enzyme

Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform is an enzyme that is encoded by the PPP2CA gene.

<span class="mw-page-title-main">1-phosphofructokinase</span> InterPro Family

In enzymology, 1-phosphofructokinase is an enzyme that catalyzes the chemical reaction

<span class="mw-page-title-main">Inosine kinase</span> Class of enzymes

In enzymology, an inosine kinase is an enzyme that catalyzes the chemical reaction

<span class="mw-page-title-main">Ribokinase</span>

In enzymology, a ribokinase is an enzyme that catalyzes the chemical reaction

<span class="mw-page-title-main">PRKCI</span> Protein-coding gene in the species Homo sapiens

Protein kinase C iota type is an enzyme that in humans is encoded by the PRKCI gene.

<span class="mw-page-title-main">NME2</span> Protein-coding gene in the species Homo sapiens

Nucleoside diphosphate kinase B is an enzyme that in humans is encoded by the NME2 gene.

<span class="mw-page-title-main">ADK (gene)</span> Protein-coding gene in the species Homo sapiens

Adenosine kinase is an enzyme that in humans is encoded by the ADK gene.

<span class="mw-page-title-main">Casein kinase 1 isoform epsilon</span> Protein and coding gene in humans

Casein kinase I isoform epsilon or CK1ε, is an enzyme that is encoded by the CSNK1E gene in humans. It is the mammalian homolog of doubletime. CK1ε is a serine/threonine protein kinase and is very highly conserved; therefore, this kinase is very similar to other members of the casein kinase 1 family, of which there are seven mammalian isoforms. CK1ε is most similar to CK1δ in structure and function as the two enzymes maintain a high sequence similarity on their regulatory C-terminal and catalytic domains. This gene is a major component of the mammalian oscillator which controls cellular circadian rhythms. CK1ε has also been implicated in modulating various human health issues such as cancer, neurodegenerative diseases, and diabetes.

<span class="mw-page-title-main">Calponin 1</span> Protein-coding gene in the species Homo sapiens

Calponin 1 is a basic smooth muscle protein that in humans is encoded by the CNN1 gene.

References

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