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Lerner T, Papavasiliou FN, Pecori R. RNA Editors, Cofactors, and mRNA Targets: An Overview of the C-to-U RNA Editing Machinery and Its Implication in Human Disease. Genes (Basel) 2018; 10:E13. [PMID: 30591678 PMCID: PMC6356216 DOI: 10.3390/genes10010013] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 12/10/2018] [Accepted: 12/20/2018] [Indexed: 12/22/2022] Open
Abstract
One of the most prevalent epitranscriptomic modifications is RNA editing. In higher eukaryotes, RNA editing is catalyzed by one of two classes of deaminases: ADAR family enzymes that catalyze A-to-I (read as G) editing, and AID/APOBEC family enzymes that catalyze C-to-U. ADAR-catalyzed deamination has been studied extensively. Here we focus on AID/APOBEC-catalyzed editing, and review the emergent knowledge regarding C-to-U editing consequences in the context of human disease.
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Affiliation(s)
- Taga Lerner
- Division of Immune Diversity, Program in Cancer Immunology, German Cancer Research Centre, 69120 Heidelberg, Germany.
- Division of Biosciences, Uni Heidelberg, 69120 Heidelberg, Germany.
| | - F Nina Papavasiliou
- Division of Immune Diversity, Program in Cancer Immunology, German Cancer Research Centre, 69120 Heidelberg, Germany.
| | - Riccardo Pecori
- Division of Immune Diversity, Program in Cancer Immunology, German Cancer Research Centre, 69120 Heidelberg, Germany.
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Meier JC, Kankowski S, Krestel H, Hetsch F. RNA Editing-Systemic Relevance and Clue to Disease Mechanisms? Front Mol Neurosci 2016; 9:124. [PMID: 27932948 PMCID: PMC5120146 DOI: 10.3389/fnmol.2016.00124] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Accepted: 11/04/2016] [Indexed: 11/13/2022] Open
Abstract
Recent advances in sequencing technologies led to the identification of a plethora of different genes and several hundreds of amino acid recoding edited positions. Changes in editing rates of some of these positions were associated with diseases such as atherosclerosis, myopathy, epilepsy, major depression disorder, schizophrenia and other mental disorders as well as cancer and brain tumors. This review article summarizes our current knowledge on that front and presents glycine receptor C-to-U RNA editing as a first example of disease-associated increased RNA editing that includes assessment of disease mechanisms of the corresponding gene product in an animal model.
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Affiliation(s)
- Jochen C Meier
- Cell Physiology, Technische Universität Braunschweig Braunschweig, Germany
| | - Svenja Kankowski
- Cell Physiology, Technische Universität Braunschweig Braunschweig, Germany
| | - Heinz Krestel
- Neurology, Universitätsspital und Universität Bern Bern, Switzerland
| | - Florian Hetsch
- Cell Physiology, Technische Universität Braunschweig Braunschweig, Germany
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Severi F, Conticello SG. Flow-cytometric visualization of C>U mRNA editing reveals the dynamics of the process in live cells. RNA Biol 2016; 12:389-97. [PMID: 25806564 PMCID: PMC4615904 DOI: 10.1080/15476286.2015.1026033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
APOBEC1 is the catalytic subunit of the complex that edits ApolipoproteinB (ApoB) mRNA, which specifically deaminates cytidine 6666 to uracil in the human transcript. The editing leads to the generation of a stop codon, resulting in the synthesis of a truncated form of ApoB. We have developed a method to quantitatively assay ApoB RNA editing in live cells by using a double fluorescent mCherry-EGFP chimera containing a ∼300bp fragment encompassing the region of ApoB subject to RNA editing. Coexpression of APOBEC1 together with this chimera causes specific RNA editing of the ApoB fragment. The insertion of a stop codon between the mCherry and EGFP thus induces the loss of EGFP fluorescence. Using this method we analyze the dynamics of APOBEC1-dependent RNA editing under various conditions. Namely we show the interplay of APOBEC1 with known interactors (ACF, hnRNP-C1, GRY-RBP) in cells that are RNA editing-proficient (HuH-7) or -deficient (HEK-293T), and the effects of restricted cellular localization of APOBEC1 on the efficiency of the editing. Furthermore, our approach is effective in assaying the induction of RNA editing in Caco-2, a cellular model physiologically capable of ApoB RNA editing.
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Key Words
- ACF, APOBEC1 Complementation Factor
- ADAR, Adenosine Deaminase, RNA-specific
- ADAT, Adenosine Deaminase, tRNA-specific
- AID/APOBECs
- APOBEC1, Apolipoprotein B mRNA editing enzyme, catalytic polypeptide 1
- ApoB, Apolipoprotein B
- EGFP, Enhanced Green Fluorescent Protein
- FACS, Fluorescence activated cell sorting
- FBS, Fetal bovine serum
- GRY-RBP, Glycine-Arginine-Tyrosine-rich RNA-binding protein
- RBM47, RNA binding motif protein 47
- RNA editing
- cds, coding sequence
- cytosine deaminase
- hnRNP-C1, heterogeneous nuclear ribonucleoprotein C1
- lipid metabolism
- mRNA
- post-transcriptional modification
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Affiliation(s)
- Francesco Severi
- a Core Research Laboratory; Istituto Toscano Tumori ; Firenze , Italy
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4
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Abstract
Cytidine (C) to Uridine (U) RNA editing is a post-trancriptional modification that until recently was known to only affect Apolipoprotein b (Apob) RNA and minimally require 2 components of the C to U editosome, the deaminase APOBEC1 and the RNA-binding protein A1CF. Our latest work has identified a novel RNA-binding protein, RBM47, as a core component of the editosome, which can substitute A1CF for the editing of ApoB mRNA. In addition, new RNA species that are subjected to C to U editing have been identified. Here, we highlight these recent discoveries and discuss how they change our view of the composition of the C to U editing machinery and expand our knowledge of the functional attributes of C to U RNA editing.
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Affiliation(s)
- Nicolas Fossat
- a Embryology Unit; Children's Medical Research Institute ; Westmead , Australia
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Blanc V, Davidson NO. APOBEC-1-mediated RNA editing. WILEY INTERDISCIPLINARY REVIEWS-SYSTEMS BIOLOGY AND MEDICINE 2011; 2:594-602. [PMID: 20836050 DOI: 10.1002/wsbm.82] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
RNA editing defines a molecular process by which a nucleotide sequence is modified in the RNA transcript and results in an amino acid change in the recoded message from that specified in the gene. We will restrict our attention to the type of RNA editing peculiar to mammals, i.e., nuclear C to U RNA editing. This category of RNA editing contrasts with RNA modifications described in plants, i.e., organellar RNA editing (reviewed in Ref 1). Mammalian RNA editing is genetically and biochemically classified into two groups, namely insertion-deletional and substitutional. Substitutional RNA editing is exclusive to mammals, again with two types reported, namely adenosine to inosine and cytosine to uracil (C to U). This review will examine mammalian C to U RNA editing of apolipoproteinB (apoB) RNA and the role of the catalytic deaminase Apobec-1. We will speculate on the functions of Apobec-1 beyond C to U RNA editing as implied from its ability to bind AU-rich RNAs and discuss evidence that dysregulation of Apobec-1 expression might be associated with carcinogenesis through aberrant RNA editing or altered RNA stability.
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Affiliation(s)
- Valerie Blanc
- Division of Gastroenterology, Washington University School of Medicine, St. Louis, MO 63105, USA
| | - Nicholas O Davidson
- Division of Gastroenterology, Washington University School of Medicine, St. Louis, MO 63105, USA
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Chen Z, Eggerman TL, Patterson AP. ApoB mRNA editing is mediated by a coordinated modulation of multiple apoB mRNA editing enzyme components. Am J Physiol Gastrointest Liver Physiol 2007; 292:G53-65. [PMID: 16920700 DOI: 10.1152/ajpgi.00118.2006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Apolipoprotein (apo)B mRNA editing is accomplished by a large multiprotein complex. How these proteins interact to achieve the precise single-nucleotide change induced by this complex remains unclear. We investigated the relationship between altered apoB mRNA editing and changes in editing enzyme components to evaluate their roles in editing regulation. In the mouse fetal small intestine, we found that the dramatic developmental upregulation of apoB mRNA editing from approximately 3% to 88% begins with decreased levels of inhibitory CUG binding protein 2 (CUGBP2) expression followed by increased levels of apoB mRNA editing enzyme (apobec)-1 and apobec-1 complementation factor (ACF) (4- and 8-fold) and then by decreased levels of the inhibitory components glycine-arginine-tyrosine-rich RNA binding protein (GRY-RBP) and heterogeneous nuclear ribonucleoprotein (hnRNP)-C1 (75% and 56%). In contrast, the expression of KH-type splicing regulatory protein (KSRP), apobec-1 binding protein (ABBP)1, ABBP2, and Bcl-2-associated athanogene 4 (BAG4) were unaltered. In the human intestinal cell line Caco-2, the increase of apoB mRNA editing from approximately 1.7% to approximately 23% was associated with 6- and 3.2-fold increases of apobec-1 and CUGBP2, respectively. In the mouse large intestine, the editing was 48% and had a 2.7-fold relatively greater CUGBP2 level. Caco-2 and the large intestine thus have increased instead of decreased CUGBP2 and a lower level of editing, suggesting that inhibitory CUGBP2 may play a critical role in the magnitude of editing regulation. Short interfering RNA-mediated gene-specific knockdown of CUGBP2, GRY-RBP, and hnRNP-C1 resulted in increased editing in Caco-2 cells, consistent with their known inhibitory function. These data suggest that a coordinated expression of editing components determines the magnitude and specificity of apoB mRNA editing.
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Affiliation(s)
- Zhigang Chen
- Office of Biotechnology Activities, National Institutes of Health, 6705 Rockledge Dr., Suite 750, Bethesda, MD 20892, USA
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Smith HC. Measuring editing activity and identifying cytidine-to-uridine mRNA editing factors in cells and biochemical isolates. Methods Enzymol 2007; 424:389-416. [PMID: 17662851 DOI: 10.1016/s0076-6879(07)24018-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Cytidine deaminases with the capacity to act on nucleic acids play a critical role in regulating the proteome through diversification of expressed sequence beyond that encoded in the genome. A family of these enzymes, known as the APOBEC family of cytidine deaminases, has been identified in mammalian cells. APOBEC-1 edits messenger RNA, whereas other family members affect mRNA coding capacity by editing single-stranded DNA in expressed regions of the genomes. Biochemical isolation and analysis of APOBEC proteins and their interacting factors have led to an understanding of the diverse cellular processes including lipoprotein metabolism, antibody production, viral infectivity, and cancer. Practical approaches will be described for the measurement of editing activity and the analysis of proteins involved in C-to-U and dC-to-dU editing.
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Affiliation(s)
- Harold C Smith
- Department of Biochemistry, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
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8
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Krause K, Marcu KB, Greeve J. The cytidine deaminases AID and APOBEC-1 exhibit distinct functional properties in a novel yeast selectable system. Mol Immunol 2005; 43:295-307. [PMID: 15963568 PMCID: PMC1307530 DOI: 10.1016/j.molimm.2005.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2005] [Indexed: 11/20/2022]
Abstract
Activation-induced cytidine deaminase (AID) is indispensable for immunoglobulin maturation by somatic hypermutations and class switch recombination and is supposed to deaminate cytidines in DNA, while its homolog APOBEC-1 edits apolipoprotein (apo) B mRNA by cytidine deamination. We studied the editing activity of APOBEC-1 and AID in yeast using the selectable marker Gal4 linked to its specific inhibitor protein Gal80 via an apo B cassette (Gal4-C) or via the variable region of a mouse immunoglobulin heavy chain gene (Gal4-VH). Expression of APOBEC-1 induced C to U editing in up to 15% of the Gal4-C transcripts, while AID was inactive in this reaction even in the presence of the APOBEC-1 complementation factor. After expression of APOBEC-1 as well as AID approximately 10(-3) of yeast cells survived low stringency selection and expressed beta-galactosidase. Neither AID nor APOBEC-1 mutated the VH sequence of Gal4-VH, and consequently the yeast colonies did not escape high stringent selection. AID, however, induced frequent plasmid recombinations that were only rarely observed with APOBEC-1. In conclusion, AID cannot substitute APOBEC-1 to edit the apo B mRNA, and the expression of AID in yeast is not sufficient for the generation of point mutations in a highly transcribed Gal4-VH sequence. Cofactors for AID induced somatic hypermutations of immunoglobulin variable regions, that are present in B cells and a variety of non-B cells, appear to be missing in yeast. In contrast to APOBEC-1, AID alone does not exhibit an intrinsic specificity for its target sequences.
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Affiliation(s)
- Kristina Krause
- From the Department of Clinical Research, University of Berne, Berne, Switzerland
| | - Kenneth B. Marcu
- Biochemistry and Cell Biology Department, Institute for Cell and Developmental Biology, State University of New York at Stony Brook, Stony Brook, USA and CRBA Laboratory, S. Orsola University Hospital, University of Bologna, Bologna, Italy
| | - Jobst Greeve
- From the Department of Clinical Research, University of Berne, Berne, Switzerland
- Department of General Internal Medicine, Inselspital-University Hospital Berne, Berne, Switzerland
- * Correspondence: Jobst Greeve, Department of Internal Medicine, Inselspital-University Hospital Berne, CH-3010 Berne, Switzerland, Tel: 0041-31-6320146 Fax: 0041-31-6328885 E-mail:
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Sowden MP, Lehmann DM, Lin X, Smith CO, Smith HC. Identification of novel alternative splice variants of APOBEC-1 complementation factor with different capacities to support apolipoprotein B mRNA editing. J Biol Chem 2003; 279:197-206. [PMID: 14570923 DOI: 10.1074/jbc.m307920200] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Two novel mRNA transcripts have been identified that result from species- and tissue-specific, alternative polyadenylation and splicing of the pre-mRNA encoding the apolipoprotein B (apoB) editing catalytic subunit 1 (APOBEC-1) complementation factor (ACF) family of related proteins. The alternatively processed mRNAs encode 43- and 45-kDa proteins that are components of the previously identified p44 cluster of apoB RNA binding, editosomal proteins. Recombinant ACF45 displaced ACF64 and ACF43 in mooring sequence RNA binding but did not demonstrate strong binding to APOBEC-1. In contrast, ACF43 bound strongly to APOBEC-1 but demonstrated weak binding to mooring sequence RNA. Consequently ACF45/43 complemented APOBEC-1 in apoB mRNA editing with less efficiency than full-length ACF64. These data, together with the finding that all ACF variants were co-expressed in rat liver nuclei (the site of apoB mRNA editing), suggested that ACF variants might compete with one another for APOBEC-1 and apoB mRNA binding and thereby contribute to the regulation of apoB mRNA editing. In support for this hypothesis, the ratio of nuclear ACF65/64 to ACF45/43 decreased when hepatic editing was inhibited by fasting and increased when editing was re-stimulated by refeeding. These findings suggested a new model for the regulation of apoB mRNA editing in which the catalytic potential of editosomes is modulated at the level of their assembly by alterations in the relative abundance of multiple related RNA-binding auxiliary proteins and the expression level of APOBEC-1.
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Affiliation(s)
- Mark P Sowden
- Department of Biochemistry and Biophysics, University of Rochester, NY 14642, USA
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10
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Abstract
Apolipoprotein B is a large, amphipathic protein that plays a central role in lipoprotein metabolism. Because its overproduction and deficiency leads to metabolic and pathologic disorders, much effort has been paid to investigate the mechanisms of how its homeostasis is achieved. Earlier and recent studies have showed that apoB gene locus might reside in different chromatin domains in the hepatic and intestinal cells, and two sets of very distinct regulatory elements operate to control its transcription. Posttranscriptional modification of apoB mRNA is performed by a multicomponent enzyme complex, several possible pathways regulate the editing efficiency. Understanding of the mechanism responsible for apoB mRNA editing will provide the basis for C-to-U editing in gene therapy. In addition to apoB mRNA abundance and stability, its translation can be also regulated at the steps of elongation. The translocation of apoB into the ER is an important and complicated process that is less understood. Successful transport and correct folding of apoB may lead to its final secretion, otherwise subject to intracellular degradation, which is accomplished by proteasomal and nonproteasomal pathways at multiple levels and may differ among cell types.
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Affiliation(s)
- Ai-Bing Wang
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing 10005, People's Republic of China
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11
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Anant S, Davidson NO. Hydrolytic nucleoside and nucleotide deamination, and genetic instability: a possible link between RNA-editing enzymes and cancer? Trends Mol Med 2003; 9:147-52. [PMID: 12727140 DOI: 10.1016/s1471-4914(03)00032-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Post-transcriptional RNA editing generates novel gene products by changing the coding sequence of the transcript from that in the genome. Two classes of RNA editing exist in mammals, each of which involves an enzymatic deamination. These reactions have stringent sequence and structural requirements for their target RNAs, and each requires distinctive enzymatic machinery. Alterations in the expression or abundance of RNA-editing factors produce unanticipated alterations in the processing or expression of RNAs, in some cases outside their physiological targets. Recent findings suggest that unregulated expression of the cytidine-deaminase gene family might lead to deamination of deoxycytidine nucleotides in DNA. Aberrant or dysregulated RNA editing, or altered expression of editing factors, might contribute to genomic instability in cancer.
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Affiliation(s)
- Shrikant Anant
- Department of Internal Medicine, Washington University School of Medicine, Saint Louis, MO 63110, USA
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Affiliation(s)
- Valerie Blanc
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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13
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Hersberger M, Patarroyo-White S, Qian X, Arnold KS, Rohrer L, Balestra ME, Innerarity TL. Regulatable liver expression of the rabbit apolipoprotein B mRNA-editing enzyme catalytic polypeptide 1 (APOBEC-1) in mice lacking endogenous APOBEC-1 leads to aberrant hyperediting. Biochem J 2003; 369:255-62. [PMID: 12374571 PMCID: PMC1223090 DOI: 10.1042/bj20020694] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2002] [Revised: 09/17/2002] [Accepted: 10/09/2002] [Indexed: 11/17/2022]
Abstract
Apolipoprotein (apo) B mRNA editing is the deamination of C(6666) to uridine, which results in translation of the apoB-48 protein instead of the genomically encoded apoB-100. ApoB-48-containing lipoproteins are cleared more rapidly from plasma and are less atherogenic than apoB-100-containing low-density lipoproteins (LDLs). In humans, the intestine predominantly produces apoB-48 whereas the liver secretes apoB-100 only. To evaluate a potential therapeutic use for liver-induced apoB mRNA editing in humans, we investigated the efficiency and safety of transgenic expression of apoB mRNA-editing enzyme catalytic polypeptide 1 (APOBEC-1) in the absence of endogenous editing in the mouse model. Here we show that regulatable tetO-mediated APOBEC-1 expression in the livers of gene-targeted mice lacking endogenous APOBEC-1 results in 30% apoB mRNA editing. In a time-course experiment, the expression of tetO-APOBEC-1 mRNA was suppressed within 2 days after mice were fed doxycycline and apoB mRNA editing and apoB-48 formation were suppressed within 4 days. However, tetO-APOBEC-1 expression resulted in regulatable aberrant hyperediting of several cytidines downstream of C(6666) in apoB mRNA and in novel APOBEC-1 target 1 (NAT1) mRNA. Several of the cytidines in apoB mRNA were hyperedited to a level similar to that of C(6666), although editing at C(6666) was lower than that in wild-type mice. These results demonstrate that even moderate APOBEC-1 expression can lead to hyperediting, limiting the single-gene approach for gene therapy with APOBEC-1.
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Affiliation(s)
- Martin Hersberger
- Gladstone Institute of Cardiovascular Disease, University of California, Building 40, Third Floor, P.O. Box 419100, 2550 23rd Street, San Francisco, CA 94141-9100, U.S.A.
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Anant S, Blanc V, Davidson NO. Molecular regulation, evolutionary, and functional adaptations associated with C to U editing of mammalian apolipoproteinB mRNA. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 2003; 75:1-41. [PMID: 14604008 DOI: 10.1016/s0079-6603(03)75001-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
RNA editing encompasses an important class of co- or posttranscriptional nucleic acid modification that has expanded our understanding of the range of mechanisms that facilitate genetic plasticity. Since the initial description of RNA editing in trypanosome mitochondria, a model of gene regulation has emerged that now encompasses a diverse range of biochemical and genetic mechanisms by which nuclear, mitochondrial, and t-RNA sequences are modified from templated versions encoded in the genome. RNA editing is genetically and biochemically distinct from other RNA modifications such as splicing, capping, and polyadenylation although, as discussed in Section I, these modifications may have relevance to the regulation of certain types of mammalian RNA editing. This review will focus on C to U RNA editing, in particular, the biochemical and genetic mechanisms that regulate this process in mammals. These mechanisms will be examined in the context of the prototype model of C to U RNA editing, namely the posttranscriptional cytidine deamination targeting a single nucleotide in mammalian apolipoproteinB (apoB). Other examples of C to U RNA editing will be discussed and the molecular mechanisms--where known--contrasted with those regulating apoB RNA editing.
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Affiliation(s)
- Shrikant Anant
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
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Lellek H, Welker S, Diehl I, Kirsten R, Greeve J. Reconstitution of mRNA editing in yeast using a Gal4-apoB-Gal80 fusion transcript as the selectable marker. J Biol Chem 2002; 277:23638-44. [PMID: 11976346 DOI: 10.1074/jbc.m203517200] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We describe a fusion transcript of Gal4 linked to its specific inhibitor protein Gal80 by 276 nucleotides of apolipoprotein (apo) B sequence as a selectable marker for mRNA editing. Editing of apoB mRNA is catalyzed by an editing enzyme complex that introduces a stop codon by deamination of C to U. The catalytic subunit APOBEC-1 is a cytidine deaminase and requires a second essential component recently cloned and termed APOBEC-1 complementing factor (ACF) or APOBEC-1-stimulating protein (ASP). The aim of this study was to demonstrate that APOBEC-1 plus ACF/ASP comprise all that is required for editing of apoB mRNA in vivo. Expression of APOBEC-1 and Gal4 fused to its inhibitor Gal80 by an intervening unedited apoB sequence (Gal4-apoB(C)-Gal80) did not result in the Gal4-dependent expression of HIS3 and beta-galactosidase in the yeast strain CG1945. Co-expression of APOBEC-1 and ACF/ASP induced editing of the apoB site in up to 13% of the Gal4-apoB(C)-Gal80 transcripts and enabled selection of yeast cells for robust expression of HIS3 and beta-galactosidase. Additional expression of the alternative splicing regulatory protein KSRP increased the editing of the apoB site by APOBEC-1 and ACF/ASP to 21%. Thus, APOBEC-1 and ACF/ASP represent the core apoB mRNA editing enzyme in vivo. This study demonstrates for the first time the successful use of a selectable marker for mRNA editing. The Gal4-Gal80 system is analogous to the two-hybrid assay and may have broader applications for the study of other mRNA processing reactions.
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Affiliation(s)
- Heinrich Lellek
- Klinik und Poliklinik für Innere Medizin, Kernklinik und Poliklinik, Universitätsklinikum Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
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16
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Dance GSC, Sowden MP, Cartegni L, Cooper E, Krainer AR, Smith HC. Two proteins essential for apolipoprotein B mRNA editing are expressed from a single gene through alternative splicing. J Biol Chem 2002; 277:12703-9. [PMID: 11815617 DOI: 10.1074/jbc.m111337200] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Apolipoprotein B (apoB) mRNA editing involves site-specific deamination of cytidine to form uridine, resulting in the production of an in-frame stop codon. Protein translated from edited mRNA is associated with a reduced risk of atherosclerosis, and hence the protein factors that regulate hepatic apoB mRNA editing are of interest. A human protein essential for apoB mRNA editing and an eight-amino acid-longer variant of no known function have been recently cloned. We report that both proteins, henceforth referred to as ACF64 and ACF65, supported APOBEC-1 (the catalytic subunit of the editosome) equivalently in editing of apoB mRNA. They are encoded by a single 82-kb gene on chromosome 10. The transcripts are encoded by 15 exons that are expressed from a tissue-specific promoter minimally contained within the -0.33-kb DNA sequence. ACF64 and ACF65 mRNAs are expressed in both liver and intestinal cells in an approximate 1:4 ratio. Exon 11 is alternatively spliced to include or exclude 24 nucleotides of exon 12, thereby encoding ACF65 and ACF64, respectively. Recognition motifs for the serine/arginine-rich (SR) proteins SC35, SRp40, SRp55, and SF2/ASF involved in alternative RNA splicing were predicted in exon 12. Overexpression of these SR proteins in liver cells demonstrated that alternative splicing of a minigene-derived transcript to express ACF65 was enhanced 6-fold by SRp40. The data account for the expression of two editing factors and provide a possible explanation for their different levels of expression.
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Affiliation(s)
- Geoffrey S C Dance
- Departments of Biochemistry and Biophysics, University of Rochester, Rochester, NY 14642, USA
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17
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Giangreco A, Sowden MP, Mikityansky I, Smith HC. Ethanol stimulates apolipoprotein B mRNA editing in the absence of de novo RNA or protein synthesis. Biochem Biophys Res Commun 2001; 289:1162-7. [PMID: 11741314 DOI: 10.1006/bbrc.2001.6082] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Apolipoprotein B (apoB) mRNA editing involves a site-specific modification of cytidine to form uridine. The reaction is catalyzed in the nucleus by a multi-protein editosome. Rat hepatic editing is regulated during development, metabolically and in response to ethanol. Ethanol stimulated editing in hepatocytes within minutes of exposure. In the present study, we show that ethanol stimulated apoB mRNA synthesis and apoB mRNA editing. Significantly, the proportion of edited apoB mRNA also increased following ethanol treatment of transcription or translation arrested cells. These data suggested that ethanol could regulate editing activity using pre-existing editosomal proteins. In addition, the presence of a suppressor of apoB mRNA editing activity was suggested by the finding that inhibition of mRNA or protein synthesis alone was sufficient to increase the proportion of edited RNA. It is proposed that the level of editing activity observed in hepatocytes may be the end result of positive and negative regulatory proteins.
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Affiliation(s)
- A Giangreco
- Department of Biochemistry and Biophysics, James P. Wilmot Cancer Center, University of Rochester, School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, New York 14623, USA
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Anant S, Henderson JO, Mukhopadhyay D, Navaratnam N, Kennedy S, Min J, Davidson NO. Novel role for RNA-binding protein CUGBP2 in mammalian RNA editing. CUGBP2 modulates C to U editing of apolipoprotein B mRNA by interacting with apobec-1 and ACF, the apobec-1 complementation factor. J Biol Chem 2001; 276:47338-51. [PMID: 11577082 DOI: 10.1074/jbc.m104911200] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mammalian apolipoprotein B (apoB) mRNA editing is mediated by a multicomponent holoenzyme containing apobec-1 and ACF. We have now identified CUGBP2, a 54-kDa RNA-binding protein, as a component of this holoenzyme. CUGBP2 and ACF co-fractionate in bovine liver S-100 extracts, and addition of recombinant apobec-1 leads to assembly of a holoenzyme. Immunodepletion of CUGBP2 co-precipitates ACF, and these proteins co-localize the nucleus of transfected cells, suggesting that CUGBP2 and ACF are bound in vivo. CUGBP2 binds apoB RNA, specifically an AU-rich sequence located immediately upstream of the edited cytidine. ApoB RNA from McA cells, bound to CUGBP2, was more extensively edited than the unbound fraction. However, addition of recombinant CUGBP2 to a reconstituted system demonstrated a dose-dependent inhibition of C to U RNA editing, which was rescued with either apobec-1 or ACF. Antisense CUGBP2 knockout increased endogenous apoB RNA editing, whereas antisense knockout of either apobec-1 or ACF expression eliminated apoB RNA editing, establishing the absolute requirement of these components of the core enzyme. These data suggest that CUGBP2 plays a role in apoB mRNA editing by forming a regulatory complex with the three components of the minimal editing enzyme, apobec-1, ACF, and apoB RNA.
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Affiliation(s)
- S Anant
- Department of Internal Medicine, Division of Gastroenterology, Washington University Medical School, 660 South Euclid Ave., St Louis, MO 63110, USA
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19
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Anant S, Mukhopadhyay D, Sankaranand V, Kennedy S, Henderson JO, Davidson NO. ARCD-1, an apobec-1-related cytidine deaminase, exerts a dominant negative effect on C to U RNA editing. Am J Physiol Cell Physiol 2001; 281:C1904-16. [PMID: 11698249 DOI: 10.1152/ajpcell.2001.281.6.c1904] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mammalian apolipoprotein B (apoB) C to U RNA editing is catalyzed by a multicomponent holoenzyme containing a single catalytic subunit, apobec-1. We have characterized an apobec-1 homologue, ARCD-1, located on chromosome 6p21.1, and determined its role in apoB mRNA editing. ARCD-1 mRNA is ubiquitously expressed; phylogenetic analysis reveals it to be a distant member of the RNA editing family. Recombinant ARCD-1 demonstrates cytidine deaminase and apoB RNA binding activity but does not catalyze C to U RNA editing, either in vitro or in vivo. Although not competent itself to mediate deamination of apoB mRNA, ARCD-1 inhibits apobec-1-mediated C to U RNA editing. ARCD-1 interacts and heterodimerizes with both apobec-1 and apobec-1 complementation factor (ACF) and localizes to both the nucleus and cytoplasm of transfected cells. Together, the data suggest that ARCD-1 is a novel cytidine deaminase that interacts with apobec-1 and ACF to inhibit apoB mRNA editing, possibly through interaction with other protein components of the apoB RNA editing holoenzyme.
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Affiliation(s)
- S Anant
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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20
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Sowden MP, Smith HC. Commitment of apolipoprotein B RNA to the splicing pathway regulates cytidine-to-uridine editing-site utilization. Biochem J 2001; 359:697-705. [PMID: 11672445 PMCID: PMC1222192 DOI: 10.1042/0264-6021:3590697] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A tripartite motif located in the centre of the 7.5 kb exon 26 of apolipoprotein B (apoB) mRNA directs editosome assembly and site-specific cytidine-to-uridine editing at nucleotide 6666. apoB mRNA editing is a post-transcriptional event, occurring primarily at the time exon 26 is spliced or at a time after splicing, but before nuclear export. We show, through reporter RNA constructs, that RNA splice sites suppress editing of precursor RNAs when placed proximal or distal to the editing site. Processed RNAs were edited more efficiently than precursor RNAs. Mutation of both the splice donor and acceptor sites was necessary for RNAs to be edited efficiently. The results suggested that commitment of pre-mRNA to the splicing and/or nuclear-export pathways may play a role in regulating editing-site utilization. The HIV-1 Rev-Rev response element ('RRE') interaction was utilized to uncouple the commitment of precursor RNAs to the spliceosome assembly pathway and associated nuclear-export pathway. Under these conditions, unspliced reporter RNAs were edited efficiently. We propose that pre-mRNA passage through the temporal or spatial restriction point where they become committed to spliceosome assembly contributes regulatory information for subsequent editosome activity.
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Affiliation(s)
- M P Sowden
- Department of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642, USA
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21
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Chen Z, Eggerman TL, Patterson AP. Phosphorylation is a regulatory mechanism in apolipoprotein B mRNA editing. Biochem J 2001; 357:661-72. [PMID: 11463337 PMCID: PMC1221996 DOI: 10.1042/0264-6021:3570661] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The editing of apolipoprotein B (apoB) mRNA is under tissue-specific, developmental and metabolic regulation. We found that multiple protein kinase inhibitors or activators increased apoB mRNA editing up to 2.5-fold in Caco-2 cells and 3-8-fold in McA7777 and FAO rat cells respectively. The phosphorylation-agent-induced modulation is independent of the apolipoprotein B editing catalytic subunit 1 (APOBEC-1) and of apoB mRNA expression levels, indicating the involvement of a protein modification, such as phosphorylation, regulating the cellular editing of apoB mRNA. Transient expression of protein kinase C-θ more than doubled apoB mRNA editing in FAO cells. Chronic exposure to ethanol, a treatment known to increase the expression of protein kinases and to change protein phosphorylation status, increased apoB mRNA editing in FAO cells up to 2.5-fold without increasing the mRNA abundance of APOBEC-1. The elimination of potential phosphorylation sites 47 and 72 of human APOBEC-1 decreased its activity to approx. one-eighth of control levels by a Ser(47)-->Ala mutation, but more than doubled the activity by a Ser(72)-->Ala mutation. The activity modulation was reversed by a Ser-->Asp mutation at sites 47 and 72, which introduced a phosphorylation-like carbonic acid group. Both human APOBEC-1 dephosphorylated by alkaline phosphase and the Ser(47,72)-to-alanine double mutant protein demonstrated a shifted isoelectric focusing pattern compared with the wild type, indicating phosphorylation at these sites. Taken together, these results suggest that phosphorylation might be an important mechanism in the regulation of apoB mRNA editing.
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Affiliation(s)
- Z Chen
- National Heart, Lung and Blood Institute, National Institutes of Health, 6000 Executive Boulevard, Suite 302, Bethesda, MD 20892, USA
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22
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Lau PP, Chang BH, Chan L. Two-Hybrid Cloning Identifies an RNA-Binding Protein, GRY-RBP, as a Component of apobec-1 Editosome. Biochem Biophys Res Commun 2001; 282:977-83. [PMID: 11352648 DOI: 10.1006/bbrc.2001.4679] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ApoB mRNA editing is mediated by an editosome complex with apobec-1 as its catalytic component. By yeast two-hybrid cloning using apobec-1 as bait we identified a 69.6-kDa RNA binding protein, GRY-RBP, that contains 3 RNA-recognition motifs (RRMs) as a novel apobec-1 associating protein. GRY-RBP may be an alternatively spliced species of NASP1, a protein of known function. GRY-RBP was shown to bind to apobec-1, the catalytic component of apoB mRNA editosome, in vivo and in vitro. Immunodepletion using a monospecific rabbit antibody abolished editing in apobec-1 expressing HepG2 S-100 extracts. GRY-RBD interacted with apobec-1 through its C-terminus. It contains three RRM (RNA recognition motifs) domains that are homologous to those found in human ACF (apobec-1 complementation factor). Phylogeny analysis of the RRM domain-containing proteins indicates that GRY-RBP clusters with hnRNP-R, ACF, and ABBP-1 (another apobec-1 binding protein). In addition to its involvement with apobec-1 editosome, the suggested cellular functions of GRY-RBD and its structural homologues include RNA transport and RNA secondary structure stabilization.
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Affiliation(s)
- P P Lau
- Department of Molecular and Cell Biology, Baylor College of Medicine, Houston, Texas 77030, USA
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23
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Blanc V, Navaratnam N, Henderson JO, Anant S, Kennedy S, Jarmuz A, Scott J, Davidson NO. Identification of GRY-RBP as an apolipoprotein B RNA-binding protein that interacts with both apobec-1 and apobec-1 complementation factor to modulate C to U editing. J Biol Chem 2001; 276:10272-83. [PMID: 11134005 DOI: 10.1074/jbc.m006435200] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
C to U editing of apolipoprotein B (apoB) mRNA involves the interaction of a multicomponent editing enzyme complex with a requisite RNA sequence embedded within an AU-rich context. This enzyme complex includes apobec-1, an RNA-specific cytidine deaminase, and apobec-1 complementation factor (ACF), a novel 65-kDa RNA-binding protein, that together represent the minimal core of the editing enzyme complex. The precise composition of the holo-enzyme, however, remains unknown. We have previously isolated an enriched fraction of S100 extracts, prepared from chicken intestinal cells, that displays apoB RNA binding and which, following supplementation with apobec-1, permits efficient C to U editing. Peptide sequencing of this most active fraction reveals the presence of ACF as well as GRY-RBP, an RNA-binding protein with approximately 50% homology to ACF. GRY-RBP was independently isolated from a two-hybrid screen of chicken intestinal cDNA. GRY-RBP binds to ACF, to apobec-1, and also binds apoB RNA. Experiments using recombinant proteins demonstrate that GRY-RBP binds to ACF and inhibits both the binding of ACF to apoB RNA and C to U RNA editing. This competitive inhibition is rescued by addition of ACF, suggesting that GRY-RBP binds to and sequesters ACF. As further evidence of the role of GRY-RBP, rat hepatoma cells treated with an antisense oligonucleotide to GRY-RBP demonstrated an increase in C to U editing of endogenous apoB RNA. ACF and GRY-RBP colocalize in the nucleus of transfected cells and, in cotransfection experiments with apobec-1, each appears to colocalize in a predominantly nuclear distribution. Taken together, the results indicate that GRY-RBP is a member of the ACF gene family that may function to modulate C to U RNA editing through binding either to ACF or to apobec-1 or, alternatively, to the target RNA itself.
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MESH Headings
- APOBEC-1 Deaminase
- Amino Acid Sequence
- Animals
- Apolipoproteins B/metabolism
- Base Sequence
- Blotting, Western
- COS Cells
- Carcinoma, Hepatocellular/metabolism
- Cell Line
- Chickens
- Cloning, Molecular
- Cytidine Deaminase/genetics
- Cytidine Deaminase/metabolism
- DNA, Complementary/metabolism
- Dose-Response Relationship, Drug
- Electrophoresis, Polyacrylamide Gel
- Heterogeneous-Nuclear Ribonucleoproteins
- Humans
- Liver Neoplasms/metabolism
- Microscopy, Fluorescence
- Molecular Sequence Data
- Oligonucleotides, Antisense/metabolism
- Peptides/chemistry
- Phylogeny
- Precipitin Tests
- Protein Binding
- Protein Isoforms
- RNA Editing
- RNA-Binding Proteins/chemistry
- RNA-Binding Proteins/genetics
- RNA-Binding Proteins/metabolism
- Rats
- Recombinant Proteins/metabolism
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Transfection
- Tumor Cells, Cultured
- Two-Hybrid System Techniques
- Ultraviolet Rays
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Affiliation(s)
- V Blanc
- Department of Internal Medicine and Department of Pharmacology and Molecular Biology, Washington University School of Medicine, St. Louis, Missouri 63110 , USA
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24
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Davidson NO, Shelness GS. APOLIPOPROTEIN B: mRNA editing, lipoprotein assembly, and presecretory degradation. Annu Rev Nutr 2001; 20:169-93. [PMID: 10940331 DOI: 10.1146/annurev.nutr.20.1.169] [Citation(s) in RCA: 210] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Apolipoprotein (apo)B circulates in two distinct forms, apoB100 and apoB48. Human liver secretes apoB100, the product of a large mRNA encoding 4536 residues. The small intestine of all mammals secretes apoB48, which arises following C-to-U deamination of a single cytidine base in the nuclear apoB transcript, introducing a translational stop codon. This process, referred to as apoB RNA editing, operates through a multicomponent enzyme complex that contains a single catalytic subunit, apobec-1, in addition to other protein factors that have yet to be cloned. ApoB RNA editing also exhibits stringent cis-acting requirements that include both structural and sequence-specific elements-specifically efficiency elements that flank the minimal cassette, an AU-rich RNA context, and an 11-nucleotide mooring sequence-located in proximity to a suitably positioned (usually upstream) cytidine. C-to-U RNA editing may become unconstrained under circumstances where apobec-1 is overexpressed, in which case multiple cytidines in apoB RNA, as well as in other transcripts, undergo C-to-U editing. ApoB RNA editing is eliminated following targeting of apobec-1, establishing that there is no genetic redundancy in this function. Under physiological circumstances, apoB RNA editing exhibits developmental, hormonal, and nutritional regulation, in some cases related to transcriptional regulation of apobec-1 mRNA. ApoB and the microsomal triglyceride transfer protein (MTP) are essential for the assembly and secretion of apoB-containing lipoproteins. MTP functions by transferring lipid to apoB during its translation and by transporting triglycerides into the endoplasmic reticulum to form apoB-free lipid droplets. These droplets fuse with nascent apoB-containing particles to form mature, very low-density lipoproteins or chylomicrons. In cultured hepatic cells, lipid availability dictates the rate of apoB production. Unlipidated or underlipidated forms of apoB are subjected to presecretory degradation, a process mediated by retrograde transport from the lumen of the endoplasmic reticulum to the cytosol, coupled with multiubquitination and proteasomal degradation. Although control of lipid secretion in vivo is primarily achieved at the level of lipoprotein particle size, regulation of apoB production by presecretory degradation may be relevant in some dyslipidemic states.
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Affiliation(s)
- N O Davidson
- Departments of Medicine and Molecular Biology and Pharmacology, Washington University Medical School, St. Louis, Missouri 63110, USA.
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25
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Chester A, Scott J, Anant S, Navaratnam N. RNA editing: cytidine to uridine conversion in apolipoprotein B mRNA. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1494:1-13. [PMID: 11072063 DOI: 10.1016/s0167-4781(00)00219-0] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
RNA editing is a post-transcriptional process that changes the informational capacity within the RNA. These processes include alterations made by nucleotide deletion, insertion and base conversion. A to I and C to U conversion occurs in mammals and these editing events are catalysed by RNA binding deaminases. C to U editing of apoB mRNA was the first mammalian editing event to be identified. The minimal protein complex necessary for apoB mRNA editing has been determined and consists of APOBEC-1 and ACF. Overexpression of APOBEC-1 in transgenic animals caused liver dysplasia and APOBEC-1 has been identified in neurofibromatosis type 1 tumours, suggesting that RNA editing may be another mechanism for tumourigenesis. Several APOBEC-1-like proteins have been identified, including a family of APOBEC-1-related proteins with unknown function on chromosome 22. This review summarises the different types of RNA editing and discusses the current status of C to U apoB mRNA editing. This knowledge is very important in understanding the structure and function of these related proteins and their role in biology.
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Affiliation(s)
- A Chester
- MRC Molecular Medicine, Clinical Science Centre, Imperial College School of Medicine, Hammersmith Hospital, London, UK
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26
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Chen Z, Eggerman TL, Potosky D, Arborati M, Patterson AP. Calcium increases apolipoprotein B mRNA editing. Biochem Biophys Res Commun 2000; 277:221-7. [PMID: 11027667 DOI: 10.1006/bbrc.2000.3668] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ApoB-100 and apoB-48 are major components of chylomicrons, very low-density lipoprotein (VLDL) and low-density lipoprotein (LDL). The two proteins are generated from a single apoB mRNA by apoB mRNA editing which induces an in-frame stop codon in apoB mRNA. Apolipoprotein B (apoB) mRNA editing is an important determinant of the proportion of full-length (apoB-100) and truncated (apoB-48) proteins in total apoB metabolism. Calcium is involved in the regulation of secretion and synthesis of VLDL and apoB. In this paper, we demonstrate for the first time that the amount of edited apoB mRNA in the cultured cells Caco-2 and McA7777 is markedly increased by calcium. Increasing extracellular calcium concentration, calcium ionophore (A23187 and ionomycin) treatment, and depleting calcium stores and raising cytoplasmic calcium concentration by thapsigargin increase apoB mRNA editing up to threefold in a dose dependent manner. Calcium has no direct stimulative effect on apoB mRNA editing in an in vitro editing system. The editing increase by extracellular calcium is not related to alterations of APOBEC-1 mRNA expression. These data suggest that calcium is not only involved in the regulation of apolipoprotein metabolism but also apoB mRNA editing.
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Affiliation(s)
- Z Chen
- National Heart, Lung and Blood Institute, Bethesda, Maryland, 20892, USA
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27
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Yang Y, Sowden MP, Smith HC. Induction of cytidine to uridine editing on cytoplasmic apolipoprotein B mRNA by overexpressing APOBEC-1. J Biol Chem 2000; 275:22663-9. [PMID: 10833526 DOI: 10.1074/jbc.m910406199] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Post-transcriptional editing of apolipoprotein B (apoB) mRNA is regulated in hepatic cells to achieve a steady state proportion of edited and unedited RNA molecules. This activity is catalyzed by APOBEC-1 (apoB mRNA editing catalytic subunit 1) in what has been widely accepted as nuclear event occurring during or after mRNA splicing. Introns impair the efficiency of editing within an adjacent exon in a distance-dependent manner in reporter RNAs. We show here that this inhibition can be overcome by overexpressing APOBEC-1 and that the enhanced editing efficiency on these reporter RNAs occurred after splicing on cytoplasmic transcripts. Given the absolute requirement of auxiliary proteins in apoB mRNA editing, the data suggested that auxiliary proteins were distributed with APOBEC-1 in both the nucleus and cytoplasm of McArdle cells. In fact, immunolocalization of one such auxiliary protein, APOBEC-1 complementation factor (ACF) demonstrated a nuclear and cytoplasmic distribution. We also demonstrate that in the absence of alterations in APOBEC-1 expression, changes in edited apoB RNA induced by ethanol arise through the stimulation of nuclear editing activity. The finding that apoB mRNA editing can occur in the cytoplasm but normally does not suggests that under biological conditions, restricting editing activity to the nucleus must be an important step in regulating the proportion of the edited apoB mRNAs.
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Affiliation(s)
- Y Yang
- Department of Biochemistry and Biophysics, Environmental Health Sciences Center, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, USA
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28
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Anant S, Davidson NO. An AU-rich sequence element (UUUN[A/U]U) downstream of the edited C in apolipoprotein B mRNA is a high-affinity binding site for Apobec-1: binding of Apobec-1 to this motif in the 3' untranslated region of c-myc increases mRNA stability. Mol Cell Biol 2000; 20:1982-92. [PMID: 10688645 PMCID: PMC110815 DOI: 10.1128/mcb.20.6.1982-1992.2000] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Apobec-1, the catalytic subunit of the mammalian apolipoprotein B (apoB) mRNA-editing enzyme, is a cytidine deaminase with RNA binding activity for AU-rich sequences. This RNA binding activity is required for Apobec-1 to mediate C-to-U RNA editing. Filter binding assays, using immobilized Apobec-1, demonstrate saturable binding to a 105-nt apoB RNA with a K(d) of approximately 435 nM. A series of AU-rich templates was used to identify a high-affinity ( approximately 50 nM) binding site of consensus sequence UUUN[A/U]U, with multiple copies of this sequence constituting the high-affinity binding site. In order to determine whether this consensus site could be functionally demonstrated from within an apoB RNA, circular-permutation analysis was performed, revealing one major (UUUGAU) and one minor (UU) site located 3 and 16 nucleotides, respectively, downstream of the edited base. Secondary-structure predictions reveal a stem-loop flanking the edited base with Apobec-1 binding to the consensus site(s) at an open loop. A similar consensus (AUUUA) is present in the 3' untranslated regions of several mRNAs, including that of c-myc, that are known to undergo rapid degradation. In this context, it is presumed that the consensus motif acts as a destabilizing element. As an independent test of the ability of Apobec-1 to bind to this sequence, F442A cells were transfected with Apobec-1 and the half-life of c-myc mRNA was determined following actinomycin D treatment. These studies demonstrated an increase in the half-life of c-myc mRNA from 90 to 240 min in control versus Apobec-1-expressing cells. Apobec-1 expression mutants, in which RNA binding activity is eliminated, failed to alter c-myc mRNA turnover. Taken together, the data establish a consensus binding site for Apobec-1 embedded in proximity to the edited base in apoB RNA. Binding to this site in other target RNAs raises the possibility that Apobec-1 may be involved in other aspects of RNA metabolism, independent of its role as an apoB RNA-specific cytidine deaminase.
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Affiliation(s)
- S Anant
- Department of Internal Medicine, Washington University Medical School, St. Louis, Missouri 63110, USA
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29
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Mehta A, Kinter MT, Sherman NE, Driscoll DM. Molecular cloning of apobec-1 complementation factor, a novel RNA-binding protein involved in the editing of apolipoprotein B mRNA. Mol Cell Biol 2000; 20:1846-54. [PMID: 10669759 PMCID: PMC85365 DOI: 10.1128/mcb.20.5.1846-1854.2000] [Citation(s) in RCA: 213] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The C-to-U editing of apolipoprotein B (apo-B) mRNA is catalyzed by a multiprotein complex that recognizes an 11-nucleotide mooring sequence downstream of the editing site. The catalytic subunit of the editing enzyme, apobec-1, has cytidine deaminase activity but requires additional unidentified proteins to edit apo-B mRNA. We purified a 65-kDa protein that functionally complements apobec-1 and obtained peptide sequence information which was used in molecular cloning experiments. The apobec-1 complementation factor (ACF) cDNA encodes a novel 64.3-kDa protein that contains three nonidentical RNA recognition motifs. ACF and apobec-1 comprise the minimal protein requirements for apo-B mRNA editing in vitro. By UV cross-linking and immunoprecipitation, we show that ACF binds to apo-B mRNA in vitro and in vivo. Cross-linking of ACF is not competed by RNAs with mutations in the mooring sequence. Coimmunoprecipitation experiments identified an ACF-apobec-1 complex in transfected cells. Immunodepletion of ACF from rat liver extracts abolished editing activity. The immunoprecipitated complexes contained a functional holoenzyme. Our results support a model of the editing enzyme in which ACF binds to the mooring sequence in apo-B mRNA and docks apobec-1 to deaminate its target cytidine. The fact that ACF is widely expressed in human tissues that lack apobec-1 and apo-B mRNA suggests that ACF may be involved in other RNA editing or RNA processing events.
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Affiliation(s)
- A Mehta
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
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30
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Dance GS, Sowden MP, Yang Y, Smith HC. APOBEC-1 dependent cytidine to uridine editing of apolipoprotein B RNA in yeast. Nucleic Acids Res 2000; 28:424-9. [PMID: 10606639 PMCID: PMC102520 DOI: 10.1093/nar/28.2.424] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/1999] [Revised: 11/19/1999] [Accepted: 11/19/1999] [Indexed: 11/14/2022] Open
Abstract
Cytidine to uridine editing of apolipoprotein B (apoB) mRNA requires the cytidine deaminase APOBEC-1 as well as a tripartite sequence motif flanking a target cytidine in apoB mRNA and an undefined number of auxiliary proteins that mediate RNA recognition and determine site-specific editing. Yeast engineered to express APOBEC-1 and apoB mRNA supported editing under conditions of late log phase growth and stationary phase. The cis -acting sequence requirements and the intracellular distribution of APOBEC-1 in yeast were similar to those described in mammalian cells. These findings suggest that auxiliary protein functions necessary for the assembly of editing complexes, or 'editosomes', are expressed in yeast and that the distribution of editing activity is to the cell nucleus.
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Affiliation(s)
- G S Dance
- Department of Biochemistry, University of Rochester, NY 14642, USA
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31
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Steinburg MF, Schock D, Backus JW, Smith HC. Tissue-specific differences in the role of RNA 3' of the apolipoprotein B mRNA mooring sequence in editosome assembly. Biochem Biophys Res Commun 1999; 263:81-6. [PMID: 10486257 DOI: 10.1006/bbrc.1999.1329] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Site-specific editing of apolipoprotein B (apoB) mRNA by the cytidine deaminase, APOBEC-1 is proposed to require interactions of auxiliary protein(s) with an eleven nucleotide element, the mooring sequence, located 3' of the C --> U editing site. An analysis of the RNA sequence dependence for protein-RNA interactions and editosome assembly in rat liver and the small intestine demonstrated that the mooring sequence was a minimal requirement for these interactions. Sequences 3' of the mooring sequence either interacted with 66 kDa and 44 kDa proteins or enhanced the interactions of these proteins with the mooring sequence. The data also suggested tissue-specific differences in the relative importance of the 3' cis-acting 'enhancer' elements in the efficiency or stability of editosome assembly. We propose that the previously demonstrated differences in apoB mRNA editing efficiency and its regulation in liver and intestine may in part be due to differences in auxiliary protein interactions with apoB mRNA 3' of the mooring sequence.
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Affiliation(s)
- M F Steinburg
- Department of Biochemistry and Biophysics, Department of Pathology, Environmental Health Sciences Center, 601 Elmwood Avenue, Rochester, New York 14642, USA
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32
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Mutational analysis of apolipoprotein B mRNA editing enzyme (APOBEC1): structure–function relationships of RNA editing and dimerization. J Lipid Res 1999. [DOI: 10.1016/s0022-2275(20)32141-6] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Van Mater D, Sowden MP, Cianci J, Sparks JD, Sparks CE, Ballatori N, Smith HC. Ethanol increases apolipoprotein B mRNA editing in rat primary hepatocytes and McArdle cells. Biochem Biophys Res Commun 1998; 252:334-9. [PMID: 9826530 DOI: 10.1006/bbrc.1998.9647] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Apolipoprotein B (apoB) mRNA editing involves a site-specific cytidine to uridine transition catalyzed by the cytidine deaminase, APOBEC-1, in the context of and regulated by a multi-protein-containing editosome. ApoB mRNA editing in vivo is subject to tissue specific, developmental and metabolic regulation. We demonstrate for the first time that the amount of edited apoB mRNA in rat primary hepatocytes is markedly increased subsequent to transient treatment with ethanol in vitro. The apparent change in editing efficiency was dose-dependent (from 0.1%-2.4% initial ethanol dose) and occurred with rapid onset. The proportion of edited apoB mRNA was also markedly enhanced in a rat hepatoma cell line, McArdle RH7777 cells and in a stable McArdle cell line over-expressing APOBEC-1 by transient treatment with 2.5 % ethanol. In contrast, the apoB mRNA editing in a human hepatoma cell line, HepG2 cells and a stable HepG2 cell line over-expressing APOBEC-1 did not respond to ethanol treatment. The data support the possibility that editing activity is ethanol-responsive but suggest that this change is cell type-specific.
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Affiliation(s)
- D Van Mater
- Departments of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, New York, 14642, USA
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