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Belogurov AA, Ponomarenko NA, Govorun VM, Gabibov AG, Bacheva AV. Site-specific degradation of myelin basic protein by the proteasome. DOKL BIOCHEM BIOPHYS 2009; 425:68-72. [PMID: 19496324 DOI: 10.1134/s1607672909020033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Bacheva AV, Belogurov AA, Ponomarenko NA, Knorre VD, Govorun VM, Serebryakova MV, Gabibov AG. Analysis of Myelin Basic Protein Fragmentation by Proteasome. Acta Naturae 2009. [DOI: 10.32607/20758251-2009-1-1-84-87] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Bacheva AV, Belogurov AA, Ponomarenko NA, Knorre VD, Govorun VM, Serebryakova MV, Gabibov AG. Analysis of myelin basic protein fragmentation by proteasome. Acta Naturae 2009; 1:84-7. [PMID: 22649589 PMCID: PMC3347499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The proteasome is a high molecular protein complex whose purpose is specific protein degradation in eukaryotic cells. One of the proteasome functions is to produce peptides, which will then be presented on the outer cell membrane using main histocompatibility complex (MHC) molecules of the first or second class. There are definite reasons to believe that proteasome directly takes part in the specific degradation of myelin basic protein (MBP), which make up to 30% of all proteins in the myelin sheath of neuronal axons. The details of the proteasomal degradation of MBP are still unclear. In this work, the features of specific MBP degradation by proteasome were studied.It was demonstrated that MBP (non-ubiquitinated) is a good substrate for 20S and for the 26S proteasome. This is the first work on detecting the sites of MBP proteolysis by proteasome from brains of SJL/J/J and Balb/C mice's lines. Substantial differences in the degradation pattern of this neuroantigen were found, which could indicate the better presentation MBP parts on MHC molecules in the case of mice predisposed to the development of experimental autoimmune encephalomyelitis.
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Smirnov IV, Vorobiev II, Friboulet A, Avalle B, Thomas D, Knorre VD, Gabibov AG, Ponomarenko NA. The antiidiotypic approach to obtaining a proteolytic antibody. DOKL BIOCHEM BIOPHYS 2008; 420:105-7. [DOI: 10.1134/s1607672908030022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Bobik TV, Vorob'ev II, Ponomarenko NA, Gabibov AG, Miroshnikov AI. [Expression of human serum albumin in metylotrophic yeast Pichia pastoris and its structural and functional analysis]. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2008; 34:56-62. [PMID: 18365738 DOI: 10.1134/s1068162008010068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The stable strain of methylotrophic yeast Pichia pastoris secreting human serum albumin into cultural medium was obtained. Optimal conditions for expression of the protein were determined. We characterized the recombinant protein by mass spectrometry and circular dichroism and analyzed its catalytic activity.
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Reshetnyak AV, Armentano MF, Morse HC, Friboulet A, Makker SP, Tramontano A, Knorre VD, Gabibov AG, Ponomarenko NA. Mechanism-dependent selection of immunoglobulin gene library for obtaining covalent biocatalysts. DOKL BIOCHEM BIOPHYS 2007; 415:179-82. [PMID: 17933329 DOI: 10.1134/s1607672907040047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Belogurov AA, Kurkova IN, Misikov VK, Suchkov SV, Telegin GB, Alekhine AI, Goncharov NG, Knorre VD, Gabibov AG, Ponomarenko NA. Substrate specificity of catalytic autoantibodies in neurodegenerative processes. DOKL BIOCHEM BIOPHYS 2007; 413:61-4. [PMID: 17546954 DOI: 10.1134/s1607672907020068] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Gabibov AG, Ponomarenko NA, Vorobyev II, Bairamashvili DI, Knorre VD, Shuster AM, Martyanov VA, Krylov IK, Burmistrov VA, Dedov II, Miroshnikov AI. [Prospects for designing Russian gene engineering agents for medicine. Rastan is the first Russian recombinant human growth hormone]. PROBLEMY ENDOKRINOLOGII 2007; 53:19-24. [PMID: 31627572 DOI: 10.14341/probl200753219-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Indexed: 11/06/2022]
Abstract
The development of modern pharmacology cannot be imagined without the use of genetic engineering methods (recombinant DNA technology). The success of medicine is increasingly based on the active use of protein preparations obtained using the technology of transferring hereditary information (genes) from one organism to another. The emergence of the ability to express foreign genes in the cells of various organisms (both eukaryotes and prokaryotes) has become one of the revolutionary events in the science of the last two decades of the 20th century and laid the foundations of modern biotechnology.
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Suchkov SV, Vvedenskaia OI, Vostrikova IL, Gabibov AG, Kimova MV, Burdakova IA, Ponomarenko NA, Pal'tsev MA. [Antibody-mediated proteolysis of myelin-associated proteins as a new mechanism of control over demyelinization processes in multiple sclerosis]. VESTNIK ROSSIISKOI AKADEMII MEDITSINSKIKH NAUK 2007:32-6. [PMID: 17722295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Natural antibodies possessing catalytic activity present a new group of biologically active substances that are found in various autoimmune diseases such as autoimmune thyroiditis, myocarditis, multiple sclerosis, and system lupus erythematosus. Presently, an interconnection between the activity of these antibodies and the extent of organic and tissue lesion in autoaggression have been revealed. Clinical use of catalytic antibodies as a diagnostic criterion to evaluate the severity of disease, a prognostic criterion of the risk of invalidization, and as a pathogenetic basis for medicamentous treatment of autoimmune process is a promising directions of study of the role of catalytic antibodies.
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Mal'tsev KA, Khitrov AN, Vvedenskaia OI, Ponomarenko NA, Isaeva MA, Klimova MV, Tret'iak EB, Shogenov ZS, Alekberova ZS, Gabibov SV, Suchkov SV. [Catalytic autoantibodies--a new molecular instrument in cardiology and ophthalmology]. TERAPEVT ARKH 2006; 78:70-6. [PMID: 17195532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
AIM To develop a conceptual model of using catalytic autoantibodies as diagnostic and monitoring tools in organ-specific autoimmune disorders. MATERIAL AND METHODS A total of 99 patients (56 males and 43 females aged 21-52 years) with autoimmune myocarditis (AM) and 198 patients (77 males and 121 females aged 8-79 years) with autoimmune uveitis (A U) participated in the study. AM patients were examined for anticardiomyosin and anti-DNA autoantibodies (ACM, ADNAab), AU patients - for autoantibodies to S-antigen, IRBP, redopsin, phosphocine, autoDNA. RESULTS AM patients had double level of DNA-binding autoantibodies. In 1/3 of them there was hydrolysing DNA and cytotoxic activity. In AU patients maximal titers were in Behcet's disease, sympathic ophthalmia, generalized uveitis and viral uveitis. CONCLUSION Autoantibodies with different specificity and function including DNA-abzymes can be additional diagnostic and prognostic markers.
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Khitrov AN, Mal'tsev KA, Vvedenskaia OI, Ponomarenko NA, Isaeva MA, Kimova MV, Tret'iak EB, Shogenov ZS, Alekberova ZS, Gabibov AG, Suchkov SV. [Catalytic autoantibodies as a new molecular instrument in rheumatological practice]. TERAPEVT ARKH 2006; 78:59-66. [PMID: 16881365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
AIM To compare clinicopathogenetic value of DNA-hydrolizing autoantibodies or DNA-abzymes in patients with systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA). MATERIAL AND METHODS We studied sera from 180 patients with SLE, 180 RA patients and 128 healthy donors matched by age and gender; assessed catalytic and cytotoxic activity of DNA-abzymes in patients with different variants of SLE and RA course. RESULTS The highest catalytic and cytotoxic activities of DNA abzymes were observed in SLE patients. In SLE catalytic and cytotoxic activities of DNA abzymes ranged widely and their mean values depended on SLE activity in patients with systemic lesions. DNA-abzymes in RA patients showed lower catalytic and cytotoxic activities in relation to substrate DNA and target cells than in SLE. DNA-abzymes occurred most frequently in patients with high activity of RA, slow-progressive and lingering course of RA, especially in early development of visceral (extra-articular) pathology. Characteristic for DNA-abzymes in RA and SLE is the phenomenon of wide-range fluctuations due to factors determinating probability of induction of function of Ab-mediated catalysis and, therefore, incidence rates of DNA-abzymes, probably catalytic autoAb of the other specificity in a population of patients with systemic autoimmune diseases. CONCLUSION The data indicate the validity of DNA abzymes use in clinical practice for realization of diagnostic and therapeutic programs in SLE and RA.
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Kalinina EV, Ponomarenko NA, Durova OM, Paleev FN, Vorob'ev II, Kekenadze NN, Shogenov ZS, Zemtsova ME, Gnuchev NV, Gabibov AG. [Catalytic autoantibodies in autoimmune myocarditis: clinical and pathogenetic implications]. TERAPEVT ARKH 2005; 77:65-70. [PMID: 16281493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
AIM To evaluate pathogenetic and clinical significance of autoantibodies (AAB) with catalytic activity in the serum of patients with autoimmune myocarditis (AM). MATERIAL AND METHODS The study was made on the sera from 99 patients with AM of different course: malignant, benign, myocardiosclerosis (MCS). In addition to standard immunological parameters, the study was made of serum levels of anticardiomyosine-antiCM (protabzymes) and anti-DNA (DNA-abzymes) of AAB. After obtaining anti-CM and anti-DNA IgG-AT, we determined non-specific and specific proteolytic activity of anti-CM. RESULTS Maximal specific activity of protabzymes was seen in 73% patients with malignant AM, it correlated with blood levels of anti-CM AAB, DNA-abzymes activity was very high in 45% patients. In MCS proteolytic activity of autoAT was absent in 61% patients. In benign AM occurrence of protabzymes was confirmed in 35% cases. Elevated DNA-hydrolyzing activity of DNA-abzymes occurred in 13% cases. The activity had no significant correlation with serum titers of AB. In MCS proteolytic activity of AAB was absent in 61% cases, but high activity of anti-CM AAB was in 28%. The activity of DNA-abzymes in 44% ranged considerably which, in seropositive cases, detected significant correlation with serum titers of DNA-binding autoAT. CONCLUSION Evaluation of catalytic activity of AAB may be considered as a criterial test assessing the stage, clinical variants and severity of AM. It also permits formulation of the disease prognosis and its possible outcomes.
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Khitrov AN, Romadanova NB, Ogneva EA, Naumova TE, Alekberova ZS, Vorob'ev II, Gabibov AG, Ponomarenko NA, Suchkov SV. [DNA-abzymes in rheumatoid arthritis: pathogenetic and clinical significance]. TERAPEVT ARKH 2005; 77:75-80. [PMID: 16404867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
AIM To study possible pathogenetic role and clinical significance of DNA-hydrolysing autoantibodies (autoAB) or DNA-abzymes in patients with rheumatoid arthritis. MATERIAL AND METHODS Prevalence of DNA-abzymes and their catalytic activity were studied in 400 patients with rheumatoid arthritis (RA) and 88 healthy donors matched by age and gender. RESULTS Associated with DNA-binding autoAB DNA-hydrolysing activity was detected in 41.5% cases of RA. DNA-abzymes were maximally active in men with rheumatoid factor (RF) and women without RF, while it was minimal in men without RF and women with RF. By catalytic activity there was no significant differences between patients with RF and without it. The highest catalytic activity of DNA abzymes was detected in patients with distinct extraarticular pathology. DNA-abzymes were also active in patients with x-ray stage III-IV of the disease in association with high prevalence of catalytic autoAB. DNA abzymes were also active in patients with RA activity stage II and III. CONCLUSION It is possible to use DNA-abzymes in clinical practice for monitoring of the disease activity in RA.
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Suchkov SV, Alekberova ZS, Paleev FN, Naumova TE, Misikov VK, Kriazheva ES, Ponomarenko NA, Gabivov AG. [Achievements and prospects of clinical abzymology]. VESTNIK ROSSIISKOI AKADEMII MEDITSINSKIKH NAUK 2005:38-43. [PMID: 16250330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Catalytic autoantibodies (abzymes) are autoantibodies that are potentially ready to realize certain effects in the organism, first of all antibody-mediated catalysis and cytotoxicity. Natural abzymes with protolytic (protabzymes) and DNA-hydrolyzing DNA-abzymes) activity are of the greatest interest. The most impressive example of the catalytic activity of protabzymes is hydrolysis of specific proteins, revealed in patients with autoimmune diseases, such as bronchial asthma (vasoactive intestinal neuropeptide), autoimmune thyroiditis (thyroglobulin), multiple sclerosis (myelin basic protein), and autoimmune myocarditis (cardiomyosin). The pathogenic role of DNA-abzymes is not quite clear yet. However, it has been proven that they present a powerful regulator of apoptosis and other cytotoxicity mechanisms in systemic autoimmune diseases and tumors. The most promising is use of abzymes as illness activity markers, and as therapeutic agents capable of catalyzing specific proteins or activating antitumoral chemotherapeutic preparations.
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Misikov VK, Kimova MV, Durova OM, Gabibov AG, Suchkov SV, Vorobev II, Ponomarenko NA. Catalytic autoantibodies in multiple sclerosis: Pathogenetic and clinical aspects. Bull Exp Biol Med 2005; 139:85-8. [PMID: 16142285 DOI: 10.1007/s10517-005-0220-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The significance of catalytic autoantibodies abzymes in the pathogenesis of multiple sclerosis was evaluated in patients with different disease patterns and severity of disability.
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Ponomarenko NA, Durova OM, Vorob'ev II, Suchkov SV, Gabibov AG. On the Catalytic Activity of Autoantibodies in Multiple Sclerosis. DOKL BIOCHEM BIOPHYS 2004; 395:120-3. [PMID: 15253568 DOI: 10.1023/b:dobi.0000025562.98245.13] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gabibov AG, Friboulet A, Thomas D, Demin AV, Ponomarenko NA, Vorobiev II, Pillet D, Paon M, Alexandrova ES, Telegin GB, Reshetnyak AV, Grigorieva OV, Gnuchev NV, Malishkin KA, Genkin DD. Antibody proteases: induction of catalytic response. BIOCHEMISTRY. BIOKHIMIIA 2002; 67:1168-79. [PMID: 12460115 DOI: 10.1023/a:1020971509138] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Most of the data accumulated throughout the years on investigation of catalytic antibodies indicate that their production increases on the background of autoimmune abnormalities. The different approaches to induction of catalytic response toward recombinant gp120 HIV-1 surface protein in mice with various autoimmune pathologies are described. The peptidylphosphonate conjugate containing structural part of gp120 molecule is used for reactive immunization of NZB/NZW F1, MRL, and SJL mice. The specific modification of heavy and light chains of mouse autoantibodies with Val-Ala-Glu-Glu-Glu-Val-PO(OPh)2 reactive peptide was demonstrated. Increased proteolytic activity of polyclonal antibodies in SJL mice encouraged us to investigate the production of antigen-specific catalytic antibodies on the background of induced experimental autoimmune encephalomyelitis (EAE). The immunization of autoimmune-prone mice with the engineered fusions containing the fragments of gp120 and encephalitogenic epitope of myelin basic protein (MBP(89-104)) was made. The proteolytic activity of polyclonal antibodies isolated from the sera of autoimmune mice immunized by the described antigen was shown. Specific immune response of SJL mice to these antigens was characterized. Polyclonal antibodies purified from sera of the immunized animals revealed proteolytic activity. The antiidiotypic approach to raise the specific proteolytic antibody as an "internal image" of protease is described. The "second order" monoclonal antibodies toward subtilisin Carlsberg revealed pronounced proteolytic activity.
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Vorob'ev II, Ponomarenko NA, Durova OM, Kozyr' AV, Demin AV, Kolesnikov AV, Sashchenko LP, Karpeĭskiĭ MI, Gabibov AG. [Structural-functional study of recombinant forms of onconase]. BIOORGANICHESKAIA KHIMIIA 2001; 27:257-64. [PMID: 11558259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
A method for expression of an onconase gene leading to a soluble form of the protein was developed. The enzymatic and cytotoxic properties of the protein's recombinant forms were studied. Recombinant onconase with an additional N-terminal Met residue isolated in nondenaturing conditions did not substantially differ from the native enzyme in ribonucleolytic activity. The addition of a 33-mer peptide containing auxiliary elements for the simplification of isolation and detection of the recombinant protein did not affect the enzyme properties of onconase. The method proposed is useful for the onconase structure-function relation studies and enables construction of onconase-based fusion proteins for anticancer therapy.
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Telegin GB, Kalinina AR, Ponomarenko NA, Ovsepyan AA, Smirnov SV, Tsybenko VV, Homeriki SG. New experimental model of multiple myeloma. Bull Exp Biol Med 2001; 131:609-12. [PMID: 11586419 DOI: 10.1023/a:1012331425422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2001] [Indexed: 11/12/2022]
Abstract
NSO/1 (P3x63Ay 8Ut) and SP20 myeloma cells were inoculated to BALB/c OlaHsd mice. NSO/1 cells allowed adequate stage-by-stage monitoring of tumor development. The adequacy of this model was confirmed in experiments with conventional cytostatics: prospidium and cytarabine caused necrosis of tumor cells and reduced animal mortality.
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Vorobiev II, Ponomarenko NA, Durova OM, Kozyr AV, Demin AV, Kolesnikov AV, Sashchenko LP, Karpeisky MY, Gabibov AG. Russian Journal of Bioorganic Chemistry 2001; 27:225-231. [DOI: 10.1023/a:1011300402829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ponomarenko NA, Aleksandrova ES, Vorobiev II, Durova OM, Kozyr AV, Kolesnikov AV, Telegin GB, Kalinina AR, Suchkov SV, Gabibov AG. Natural antibody catalytic activities in mice with autoimmune disorders. DOKLADY BIOCHEMISTRY : PROCEEDINGS OF THE ACADEMY OF SCIENCES OF THE USSR, BIOCHEMISTRY SECTION 2000; 375:224-7. [PMID: 11296476 DOI: 10.1023/a:1026619805983] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Churikov NA, Ponomarenko NA, Mezakhot K, Shotak NG. [Localization of transcripts corresponding to different regions of the "cut" locus in Drosophila embryos]. GENETIKA 1999; 35:716-720. [PMID: 10495957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Transcripts of the cut locus were localized in Drosophila embryos with use of nonradioactive in situ hybridization. DIG-labeled probes were generated from two locus regions located at position -130. Distal and proximal regions were found to be transcribed in the same tissues throughout embryogenesis. As only the proximal region transcript was detected, the conclusion was made that two or more various transcripts derived from different regions of the locus and under common control, are present simultaneously in the embryonic cells.
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Pavlova GV, Churikov HA, Korochkin LI, Ponomarenko NA, Shostak NG. [Detection of a new tissue-specific enhancer in the ct6 region of the regulatory region of the drosophila cut locus]. GENETIKA 1999; 35:412-416. [PMID: 10368791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The cut locus of Drosophila is an interesting example of a complex eukaryotic locus responsible for the development of many tissues and organs. Most of this locus is regulatory. The entire locus was cloned by Tchurikov et al. in 1986 and Blochlinger et al. in 1988. The wing ctn enhancer located 80 kb upstream of the promoter was earlier found in a 2.7 kb EcoRI-BamHI DNA fragment. The locus region 65-80 kb remote from the promoter was assumed to control the development of wings and vibrissae. We have found a new enhancer region in the ct6 region of the locus, which was in a 5 kb BamHI-EcoRI DNA fragment adjacent to the ctn enhancer. This region is responsible for the expression of the reporter lacZ gene in many tissues and organs at all stages of Drosophila development (at least in the intestine, Malpighian tubules, thoracic and abdominal sensory organs, thoracic ganglia and in ring glands). Thus, the region located 75 kb upstream of the promoter has some properties of the locus control region (LCR).
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Tchurikov NA, Krasnov AN, Ponomarenko NA, Golova YB, Chernov BK. Forum domain in Drosophila melanogaster cut locus possesses looped domains inside. Nucleic Acids Res 1998; 26:3221-7. [PMID: 9628922 PMCID: PMC147668 DOI: 10.1093/nar/26.13.3221] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We have studied the relationship between chromosomal forum domains and looped domains in the cut locus of Drosophila melanogaster . Forum domains were earlier detected by separation in pulsed-field gels of 50-150 kb chromosomal DNA fragments obtained after spontaneous non-random degradation of chromosomes. We have localized the boundary region where cleavage sites are scattered between two forum domains in the regulatory region of the cut locus. We have sequenced a 13 kb region spanning few kilobases from distal domain, the boundary region and part of the proximal forum domain where several scaffold associated regions (SARs) were observed. We conclude that forum domains and looped domains are physically different types of domains and belong to different levels of organization in eukaryotic chromosomes. The boundary region between the neighboring forum domains in the cut locus possesses the Doc element insertion and a micro-satellite stretch and thus might remind a small island of heterochromatin and correspond to so-called intercalary heterochromatin that is known to be located in the 7B1-2 band where the major part of the cut locus is reside.
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Ponomarenko NA, Bannikov VM, Anashchenko VA, Tchurikov NA. Burdock, a novel retrotransposon in Drosophila melanogaster, integrates into the coding region of the cut locus. FEBS Lett 1997; 413:7-10. [PMID: 9287107 DOI: 10.1016/s0014-5793(97)00844-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The burdock element is known to be the 2.6-kb insertion into the same region of the cut locus in 12 independently obtained ct-lethal mutants. Here we have determined the complete sequences of this insertion and of the hot spot region. It was found that the burdock is a short retrotransposon with long terminal repeats and a single open reading frame (ORF). The polypeptide encoded by the burdock ORF contains two adjacent regions homologous to the gag and pol polyproteins of the gypsy mobile element. The burdock insertion interrupts the short ORF of the cut locus. The target site sequence of the burdock insertions is similar to the Drosophila topoisomerase II cleavage site.
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