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Bélanger F, Stepinski J, Darzynkiewicz E, Pelletier J. Characterization of hMTr1, a human Cap1 2'-O-ribose methyltransferase. J Biol Chem 2010; 285:33037-33044. [PMID: 20713356 DOI: 10.1074/jbc.m110.155283] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Cellular eukaryotic mRNAs are capped at their 5' ends with a 7-methylguanosine nucleotide, a structural feature that has been shown to be important for conferring mRNA stability, stimulating mRNA biogenesis (splicing, poly(A) addition, nucleocytoplasmic transport), and increasing translational efficiency. Whereas yeast mRNAs have no additional modifications to the cap, called cap0, higher eukaryotes are methylated at the 2'-O-ribose of the first or the first and second transcribed nucleotides, called cap1 and cap2, respectively. In the present study, we identify the methyltransferase responsible for cap1 formation in human cells, which we call hMTr1 (also known as FTSJD2 and ISG95). We show in vitro that hMTr1 catalyzes specific methylation of the 2'-O-ribose of the first nucleotide of a capped RNA transcript. Using siRNA-mediated knockdown of hMTr1 in HeLa cells, we demonstrate that hMTr1 is responsible for cap1 formation in vivo.
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Affiliation(s)
- François Bélanger
- From the Departments of Biochemistry and Oncology and The Rosalind and Morris Goodman Cancer Research Center, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | - Janusz Stepinski
- Division of Biophysics, Institute of Experimental Physics, Faculty of Physics, University of Warsaw, 02-089 Warsaw, Poland
| | - Edward Darzynkiewicz
- Division of Biophysics, Institute of Experimental Physics, Faculty of Physics, University of Warsaw, 02-089 Warsaw, Poland
| | - Jerry Pelletier
- From the Departments of Biochemistry and Oncology and The Rosalind and Morris Goodman Cancer Research Center, McGill University, Montreal, Quebec H3G 1Y6, Canada.
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Looze Y, Gillet L, Deconinck M, Leonis J, Gelbcke M. Carbon-13 Nuclear Magnetic Resonance Study of 5′-Substituted-5′-Oeoxyadenosine Derivatives. ANAL LETT 2006. [DOI: 10.1080/00032718008078008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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3
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Jiang W, Newsham IF. The tumor suppressor DAL-1/4.1B and protein methylation cooperate in inducing apoptosis in MCF-7 breast cancer cells. Mol Cancer 2006; 5:4. [PMID: 16420693 PMCID: PMC1382251 DOI: 10.1186/1476-4598-5-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2005] [Accepted: 01/18/2006] [Indexed: 01/10/2023] Open
Abstract
Background DAL-1 (Differentially Expressed in Adenocarcinoma of the Lung)/4.1B is a member of the protein 4.1 superfamily that has been shown to suppress growth in lung, breast and brain tumor cells. In the case of the caspase-3 deficient MCF-7 breast cancer cells, this growth suppression has been shown to be partially mediated by the induction of apoptosis. However the exact mechanism of action of DAL-1/4.1B is unknown. Recently, protein arginine N-methyltransferase 3 (PRMT3) was identified as a DAL-1/4.1B interacting protein. Protein arginine methyltransferases (PRMTs) posttranslationally methylate the arginine residues of proteins, a modification which has been implicated in the regulation of multiple cellular processes including nuclear-cytoplasmic transport, signal transduction, and transcription. Results To investigate the role of protein methylation in cell death induced by DAL-1/4.1B, DAL-1/4.1B-inducible MCF-7 cells were examined for apoptosis and caspase activation in the absence and presence of the protein methylation inhibitor adenosine dialdehyde (AdOX). Flow cytometry analysis revealed that apoptosis was primarily associated with the activation of caspase 8, and inhibition of this activation blocked the ability of DAL-1/4.1B to induce cell death. Conclusion These results suggest that protein methylation cooperates with DAL-1/4.1B-associated caspase 8-specific activation to induce apoptosis in breast cancer cells.
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Affiliation(s)
- Wei Jiang
- Hermlein Brain Tumor Center, Department of Neurosurgery, Henry Ford Hospital, 2799 W. Grand Boulevard, Detroit, Michigan, USA
| | - Irene F Newsham
- Hermlein Brain Tumor Center, Department of Neurosurgery, Henry Ford Hospital, 2799 W. Grand Boulevard, Detroit, Michigan, USA
- Brain Tumor Center, Department of Neuro-Oncology, M D Anderson Cancer Center 1515 Holcombe Boulevard, Houston, TX 77030
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Breillout F, Poupon MF, Blanchard P, Lascaux V, Echinard-Garin P, Robert-Gero M. Association of SIBA treatment and a Met-depleted diet inhibits in vitro growth and in vivo metastatic spread of experimental tumor cell lines. Clin Exp Metastasis 1988; 6:3-16. [PMID: 3257180 DOI: 10.1007/bf01580402] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We have used 5'-deoxy-5'-S isobutyl-thioadenosine (SIBA), an analog of S-adenosylhomocysteine, alone or in association with a methionine-depleted diet in order to obtain an antitumoral effect in two different tumor models: a transplantable rat rhabdomyosarcoma (RMS-J1) induced by i.m. injection of nickel and the well-known Lewis lung carcinoma (3LL) of C57BL/6 mice. Since SIBA has been reported to inhibit the methyl group transfer from methionine to S-adenosylhomocysteine, among other activities, its association with a reduction of methyl donors, achieved by methionine depletion of the diet (in vivo) or the culture medium (in vitro), should logically lead to an additive effect. In vitro, 3LL and RMS-J1 were sensitive to the cytotoxic effect of SIBA and were methionine-dependent for their proliferation. Fibroblast proliferation was not affected by these two treatments alone or in association. In vivo, either SIBA treatment or a low methionine diet led to a significant decrease in the metastatic character of these two tumors; however, local tumor growth was not significantly affected. The median number of 3LL metastases counted in the lungs was reduced from 100 to 18 by SIBA treatment, and to 27 by the low methionine diet. No additive effect could be detected when the treatments were given simultaneously. RMS-J1-bearing rats treated with SIBA and fed a low Met diet underwent primary tumor excision. The median numbers of lung metastatic nodules were 27, 26, 14 and 8 for the control, SIBA-treated rats, methionine-deprived rats and rats receiving the combined therapy. Expressed as percentages 20 per cent were cured, 23 per cent showed a low number of lung metastases (P less than 10), whereas all the rats in the control group developed more than 10 pulmonary nodules. No cytotoxic effect could be observed on the treated rats. The role of SIBA and methionine depletion, as agents interfering with transmethylation processes, in regard to the control of tumor development, namely metastatic invasiveness, is discussed.
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Affiliation(s)
- F Breillout
- I.R.S.C.-C.N.R.S., ER 278 Biologie des Métastases, Villejuif, France
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De Clercq E. S-adenosylhomocysteine hydrolase inhibitors as broad-spectrum antiviral agents. Biochem Pharmacol 1987; 36:2567-75. [PMID: 3300656 DOI: 10.1016/0006-2952(87)90533-8] [Citation(s) in RCA: 165] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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6
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Locht C, Delcour J. In vitro methylation of undermethylated yeast poly(A)-rich RNA using mRNA(guanine-7-)-methyltransferase purified from wheat germ or yeast. EUROPEAN JOURNAL OF BIOCHEMISTRY 1985; 152:247-51. [PMID: 2414101 DOI: 10.1111/j.1432-1033.1985.tb09190.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
By crossing two strains of Saccharomyces cerevisiae deficient for each of the two methionine adenosyltransferase isoenzymes (ATP: L-methionine S-adenosyltransferase EC 2.5.1.6) respectively, we have constructed a strain strictly auxotrophic for S-adenosylmethionine and used it as a source of undermethylated mRNA suitable for in vitro transmethylation studies. RNA has been phenol-extracted from yeast cells shifted down to S-adenosylmethionine-free medium for 90 min and poly(A)-rich RNA has been prepared by oligo(dT)-cellulose chromatography. Upon incubation in vitro in the presence of methyl-labeled S-adenosylmethionine and mRNA (guanine-7-)-methyltransferase purified from wheat germ or yeast, undermethylated poly(A)-rich RNA became significantly labeled as compared to non-starved cells from the same strain, or from a wild-type control. Cap structures were resolved by paper chromatography afer T2 and P1 RNase digestion, and shown to be a mixture of m7G5'ppp5'G and m7G5'ppp5'A, irrespective of the enzyme source, in agreement with earlier in vivo studies in yeast mRNA capping and methylation.
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De Clercq E, Bergstrom DE, Holy A, Montgomery JA. Broad-spectrum antiviral activity of adenosine analogues. Antiviral Res 1984; 4:119-33. [PMID: 6476818 DOI: 10.1016/0166-3542(84)90012-3] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
In recent years certain aliphatic and carbocyclic adenosine analogues have been developed which are of potential clinical importance as antiviral agents. This includes (S)-9-(2,3-dihydroxypropyl)adenine [(S)-DHPA] and carbocyclic 3-deazaadenosine (C-c3Ado). (S)-DHPA and C-c3Ado are remarkably similar in their antiviral spectrum in that they are particularly active against (-) RNA viruses such as measles, para-influenza, respiratory syncytial virus, rabies virus, vesicular stomatitis virus and (+/-)RNA viruses such as reo- and rotavirus, whereas (+)RNA viruses such as polio, coxsackie and (+/-)DNA viruses such as herpes simplex are only minimally affected or not inhibited at all. In contrast with (S)-DHPA and C-c3Ado which are quite selective in their antiviral action, other adenosine analogues, i.e., 3-deazaadenosine and 7-deazaadenosine (tubercidin), exhibit little, if any, selectivity as antiviral agents. Also, tubercidin has a broader activity spectrum, encompassing (+)RNA viruses as well as herpes simplex in addition to the (-)RNA viruses. Considering the high antiviral potency of tubercidin, attempts have been undertaken to increase its selectivity, i.e., by chemical substitutions at C-5 of the pyrrolo(2,3-d)pyrimidine ring. These attempts have been partially successful.
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Lawrence F, Bachrach U, Robert-Géro M. Effect of 5'-deoxy-5'-isobutylthioadenosine on putrescine uptake and polyamine biosynthesis by chick embryo fibroblasts. Biochem J 1982; 204:853-9. [PMID: 6289806 PMCID: PMC1158430 DOI: 10.1042/bj2040853] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The effect of 5'-deoxy-5'-S-isobutylthioadenosine (SIBA) on polyamine biosynthesis has been studied by using cultured chick embryo fibroblasts. It has been shown that the drug inhibits the uptake of [14C]putrescine and its conversion into labelled spermidine or spermine. The inhibitory effect is reversed by removing the inhibitor after exposing the cells to the drug for 24 h. SIBA also caused a significant decrease in cellular spermine levels and an accumulation of putrescine. These changes are reversed by removing the inhibitor. SIBA had the same effect on chick embryo fibroblasts transformed by Rous sarcoma virus; a decrease in cellular spermine levels in SIBA-treated cells was observed. In all the experiments SIBA caused a reduction in the spermine/putrescine and spermidine/putrescine ratios. It is suggested that SIBA is not only an inhibitor of transmethylation but also interferes with polyamine biosynthesis, probably by blocking aminopropyltransferase.
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Kamatani N, Willis EH, Carson DA. Sequential metabolism of 5'-isobutylthioadenosine by methylthioadenosine phosphorylase and purine-nucleoside phosphorylase in viable human cells. Biochem Biophys Res Commun 1982; 104:1335-42. [PMID: 6803802 DOI: 10.1016/0006-291x(82)91396-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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10
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White MW, Vandenbark AA, Barney CL, Ferro AJ. Structural analogs of 5'-methylthioadenosine as substrates and inhibitors of 5'-methylthioadenosine phosphorylase and as inhibitors of human lymphocyte transformation. Biochem Pharmacol 1982; 31:503-7. [PMID: 6802139 DOI: 10.1016/0006-2952(82)90151-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
5'-Deoxy-5'-methylthioadenosine (MTA) phosphorylase was purified 13.4-fold from human peripheral lymphocytes. The enzyme demonstrated normal Michaelis-Menten kinetics with Km values of 26 microM and 7.5 mM for the two substrates, MTA and phosphate, respectively. The rate of MTA degradation was temperature dependent, 47 degrees being the optimum temperature. Five structural analogs served as alternative substrates with Km values ranging from 31 to 53 microM while two compounds, 5'-deoxy-5'-methylthiotubercidin (MTT) (Ki = 31 microM) and adenine (Ki = 172 microM), were inhibitory. These same analogs were examined as inhibitors of mitogen-induced human lymphocyte blastogenesis. MTT was found to be the most effective inhibitor of lymphocyte transformation with an I50 of 80 microM.
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11
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Sacks SL, Merigan TC, Kaminska J, Fox IH. Inactivation of S-adenosylhomocysteine hydrolase during adenine arabinoside therapy. J Clin Invest 1982; 69:226-30. [PMID: 7054240 PMCID: PMC371186 DOI: 10.1172/jci110434] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
To assess for possible inhibition of cellular transmethylation during adenine arabinoside (ara-A) therapy, S-adenosylhomocysteine hydrolase activity was analyzed in 10 patients with chronic hepatitis B virus infection. In six patients receiving ara-A, enzyme activity was suppressed to 0-2% of control erythrocyte enzyme activity. This decrease in enzyme activity was evident within 4 h of starting the drug infusion and continued for 7 d after cessation of therapy. S-adenosylhomocysteine hydrolase activity of peripheral mononuclear cells was also measured in two patients receiving ara-A. Suppression to as low as 3.5% of pretreatment levels was found; however, marked fluctuations with partial return of enzyme activity during therapy was also observed in mononuclear cells. Inhibition of an enzyme involved in transmethylation reactions was observed in patients during ara-A therapy. This could contribute to the side effects and antiviral properties of ara-A.
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12
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Enouf J, Lawrence F, Robert-Géro M. Uptake of 5'-deoxy-5'-S-isobutyl thioadenosine into chick embryo fibroblasts. Biochem Pharmacol 1981; 30:2081-7. [PMID: 6975101 DOI: 10.1016/0006-2952(81)90226-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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13
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Effect of 5?-deoxy-5?-S-isobutyladenosine on hematopoietic stem cells. Bull Exp Biol Med 1981. [DOI: 10.1007/bf00837461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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14
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Ahl R. Effect of inhibitors of methylation on early and late interferon synthesis in bovine kidney cell cultures. JOURNAL OF INTERFERON RESEARCH 1981; 1:203-18. [PMID: 6180052 DOI: 10.1089/jir.1981.1.203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In virus infected bovine kidney cell cultures mainly late interferon is produced starting at about 4 hr after infection. Poly rI:poly rC induced cells as well as interferon pretreated virus infected cells produce early interferon starting immediately after induction. In infected cells the proportion of early interferon increases with time of interferon pretreatment, while late interferon is decreasing. Production of late interferon is selectively inhibited by cycloleucine, an inhibitor of S-adenosylmethionine (SAM) biosynthesis, whereas early interferon synthesis is not affected by the drug. Likewise, late interferon production is reduced much stronger than early interferon production by a combination of adenosine, L-homocysteine thiolactone, and erythro-9[3-(2-hydroxynonyl)]-adenine (EHNA) inducing in cells an accumulation of S-adenosylhomocysteine which inhibits SAM mediated methylation reactions. Inhibition of late interferon synthesis by cycloleucine is time and dose dependent and partially reversible. Cycloheximide equally blocks both early and late interferon production. Inhibition of incorporation of methyl groups into cellular RNA by the methylation inhibitors used is demonstrated by labeling with [methyl-3H] methionine and 3H-uridine. The results indicate that the synthesis of functional mRNA for early and late interferon is differentially sensitive to inhibition of methylation. The data suggest that, if early and late interferon is coded by the same structural gene, two different pathways are available for the cell to synthesize one species of mRNA.
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Bodner AJ, Cantoni GL, Chiang PK. Anti-viral activity of 3-deazaadenosine and 5'-deoxy-5'-isobutylthio-3-deazaadenosine (3-deaza-SIBA). Biochem Biophys Res Commun 1981; 98:476-81. [PMID: 6261741 DOI: 10.1016/0006-291x(81)90864-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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16
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Trager W, Tershakovec M, Chiang PK, Cantoni GL. Plasmodium falciparum: antimalarial activity in culture of sinefungin and other methylation inhibitors. Exp Parasitol 1980; 50:83-9. [PMID: 6993216 DOI: 10.1016/0014-4894(80)90010-7] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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17
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Lawrence F, Chermann JC, Robert-Gero M. Metabolism of 5' deoxy-5'[35S]-isobutyl-thio-adenosine (SIBA) in rats and mice. Biochem Pharmacol 1980; 29:1963-5. [PMID: 6967320 DOI: 10.1016/0006-2952(80)90111-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Gillet L, Looze Y, Deconinck M, Léonis J. Binding capacities of various analogues of S-adenosyl-L-homocysteine to protein methyltransferase II from human erythrocytes. EXPERIENTIA 1979; 35:1007-9. [PMID: 477857 DOI: 10.1007/bf01949909] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A series of analogues of S-adenosyl-L-homocysteine, modified mainly in the amino acid portion of the molecule, have been synthesized. All were found to be competitive inhibitors of protein methyltransferase II from human erythrocytes. S-adenosyl-L-homocysteine remains however by far the most effective inhibitor of the methylase.
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Carteni-Farina M, Della Ragione F, Ragosta G, Oliva A, Zappia V. Studies on the metabolism of 5'-isobutylthioadenosine (SIBA): phosphorolytic cleavage by methylthioadenosine phosphorylase. FEBS Lett 1979; 104:266-70. [PMID: 113257 DOI: 10.1016/0014-5793(79)80829-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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22
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Chiang PK, Cantoni GL. Perturbation of biochemical transmethylations by 3-deazaadenosine in vivo. Biochem Pharmacol 1979; 28:1897-902. [PMID: 454462 DOI: 10.1016/0006-2952(79)90642-7] [Citation(s) in RCA: 144] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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23
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Kredich NM, Hershfield MS. S-adenosylhomocysteine toxicity in normal and adenosine kinase-deficient lymphoblasts of human origin. Proc Natl Acad Sci U S A 1979; 76:2450-4. [PMID: 221926 PMCID: PMC383620 DOI: 10.1073/pnas.76.5.2450] [Citation(s) in RCA: 78] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The human lymphoblast line WI-L2 is subject to growth inhibition by a combination of the adenosine deaminase (ADA; adenosine aminohydrolase, EC 3.5.4.4.) inhibitor erythro-9-(2-hydroxy-3-nonyl)adenine (EHNA) and adenosine. Although adenosine-induced pyrimidine starvation appears to contribute to this effect, uridine only partially reverses adenosine toxicity in WI-L2 and not at all in strain 107, an adenosine kinase-(ATP:adenosine 5'-phosphotransferase, EC 2.7.1.20) deficient derivative of WI-L2. Treatment of both cell lines with EHNA and adenosine leads to striking elevations in intracellular S-adenosyl-L-homocysteine (AdoHcy), a potent inhibitor of S-adenosyl-L-methionine (AdoMet)-dependent methylation reactions. The methylation in vivo of both DNA and RNA is inhibited by concentrations of EHNA and adenosine that elevate intracellular AdoHcy. Addition of 100 muM L-homocysteine thiolactone to cells treated with EHNA and adenosine enhances adenosine toxicity and further elevates AdoHcy to levels approximately 60-fold higher than those obtained in the absence of this amino acid, presumably by combining with adenosine to form AdoHcy in a reaction catalyzed by S-adenosylhomocysteine hydrolase (EC 3.3.1.1). In the adenosine kinase-deficient strain 107, a combination of ADA inhibition and L-homocysteine thiolactone markedly increases intracellular AdoHcy and inhibits growth even in the absence of exogenous adenosine. These results demonstrate a form of toxicity from endogenously produced adenosine and support the view that AdoHcy, by inhibiting methylation, is a mediator of uridine-resistant adenosine toxicity in these human lymphoblast lines. Furthermore, they suggest that AdoHcy may play a role in the pathogenesis of the severe combined immunodeficiency disease found in most children with heritable ADA deficiency.
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Caboche M, La Bonnardiere C. Vesicular stomatitis virus mRNA methylation in vivo: effect of cycloleucine, an inhibitor of S-adenosylmethionine biosynthesis, on viral transcription and translation. Virology 1979; 93:547-57. [PMID: 222056 DOI: 10.1016/0042-6822(79)90257-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Caboche M, Hatzfeld J. Methionine metabolism in BHK cells: preliminary characterization of the physiological effects of cycloleucine, an inhibitor of s-adenosylmethionine biosynthesis. J Cell Physiol 1978; 97:361-70. [PMID: 730775 DOI: 10.1002/jcp.1040970311] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Cycloleucine is in vitro a competitive inhibitor of methionine adenosyltransferase, an enzyme involved in S-adenosylmethionine biosynthesis. The physiological effects of this drug on baby hamster kidney cells have been studied. When cells are grown in a medium containing 10 micron methionine, cycloleucine is an inhibitor of cell proliferation; high concentrations of methionine are able to withdraw this inhibition suggesting that cycloleucine toxicity is related to methionine metabolism. The drug does not primarily affect methionine uptake and its subsequent use for protein biosynthesis. Cycloleucine toxicity is correlated with a block of SAM biosynthesis and nucleic acids methylations. The actions of cycloleucine on progression in the cell cycle and DNA, RNA and protein biosynthesis are studied. The implications of these results are discussed.
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Vedel M, Lawrence F, Robert-Gero M, Lederer E. The antifungal antibiotic sinefungin as a very active inhibitor of methyltransferases and of the transformation of chick embryo fibroblasts by Rous sarcoma virus. Biochem Biophys Res Commun 1978; 85:371-6. [PMID: 217377 DOI: 10.1016/s0006-291x(78)80052-7] [Citation(s) in RCA: 79] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Bader JP, Brown NR, Chiang PK, Cantoni GL. 3-Deazaadenosine, an inhibitor of adenosylhomocysteine hydrolase, inhibits reproduction of Rous sarcoma virus and transformation of chick embryo cells. Virology 1978; 89:494-505. [PMID: 213879 DOI: 10.1016/0042-6822(78)90191-5] [Citation(s) in RCA: 75] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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29
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Terrioux C, Crépin M, Gros F, Robert-Géro M, Lederer E. Effect of 5'-deoxy-5'-S-isobutyl-adenosine (SIBA) on mouse mammary tumour cells and on the expression of mouse mammary tumour virus. Biochem Biophys Res Commun 1978; 83:673-8. [PMID: 81053 DOI: 10.1016/0006-291x(78)91042-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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30
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Casellas P, Jeanteur P. Protein methylation in animal cells. II. Inhibition of S-adenosyl-L-methionine:protein(arginine) N-methyltransferase by analogs of S-adenosyl-L-homocysteine. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 519:255-68. [PMID: 667065 DOI: 10.1016/0005-2787(78)90078-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
1. Protein methylase I (S-adenosyl-L-methionine: protein (arginine) N-methyltransferase, EC 2.1.1.23) has recently been purified in our laboratory from Krebs II ascites cells (Casellas, P. and Jeanteur, P. (1978) Biochim. Biophys. Acta 519, 243--254). In order to probe its binding site for S-adenosyl-L-methionine, three series of compounds deriving from the most potent competitive inhibitor, S-adenosyl-L-homocysteine, by specific alterations in each of the three regions of the molecule (amino acid side chain, ribose and adenine) have been tested for inhibitor activity. A competitive type of inhibition was assumed for all of them and demonstrated for five representative ones. The contribution of each of these regions to the binding could therefore be established as follows: (i) Any modification of the side chain results in a drop in affinity of about two orders of magnitude. Adenosine itself remained significantly inhibitory thereby demonstrating that the presence of a side chain was not critical, although important. (ii) The ribose moiety appears to be an essential part of the molecule as the loss of either 2'- or 3'-hydroxyls or their change to arabino configuration resulted in a nearly complete loss of activity. (iii) The amino group at position 6 and the nitrogen atom at position 7 of the adenine ring also play a crucial role although some substitutions can be tolerated. 2. S-Isobutyladenosine was shown to specifically inhibit the methylation of arginine residues as compared to lysine.
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Pugh C, Borchardt R, Stone H. Sinefungin, a potent inhibitor of virion mRNA(guanine-7-)-methyltransferase, mRNA(nucleoside-2'-)-methyltransferase, and viral multiplication. J Biol Chem 1978. [DOI: 10.1016/s0021-9258(17)34682-3] [Citation(s) in RCA: 132] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Trager W, Robert-Gero M, Lederer E. Antimalarial activity of S-isobutyl adenosine against Plasmodium falciparum in culture. FEBS Lett 1978; 85:264-6. [PMID: 340273 DOI: 10.1016/0014-5793(78)80469-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Kaehler M, Coward J, Rottman F. In vivo inhibition of Novikoff cytoplasmic messenger RNA methylation by S-tubercidinylhomocysteine. Biochemistry 1977; 16:5770-5. [PMID: 201277 DOI: 10.1021/bi00645a019] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The analogue S-tubercidinylhomocysteine (STH) has been used to study the methylation of mRNA in vivo. Partial inhibition of cytoplasmic poly(A)-RNA methylation was observed using a level of inhibitor which still permitted cell growth. Characterization of the partially methylated mRNA indicated the presence of cap structures lacking 2'-O-methylnucleosides, m7GpppN', which are normally not found in mammalian mRNA. Inhibition of additional methylated sites in mRNA at the second 2'-O-methynucleoside, and at internal N6-methyladenosine was also observed Methylation of 7-methylguanosine was not affected under the conditions used in these experiments. The methylnucleoside composition of cap structures differed in STH-inhibited and uninhibited cells. These results indicate that a completely methylated cap is not required for transport of mRNA into the cytoplasm. Furthermore, it may now be possible to assess in vivo the sequential nature of mRNA methylation and its potential role in mRNA processing.
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