Abstract:
:Genomic DNAs of the related parasitic nematodes Onchocerca volvulus and Dirofilariae immitis, and a cDNA library of O. volvulus, were examined for the presence of the 22-nucleotide spliced leader (SL) found at the 5' ends of 10 to 15% of the mRNAs in the free-living nematode Caenorhabditis elegans. As in C. elegans, genes for the SL RNA are linked to the repetitive 5S rRNA genes of O. volvulus and D. immitis, but unlike C. elegans, they are in the same orientation as the 5S rRNA genes within the repeat unit. In O. volvulus the SL sequence is also encoded at more than 30 additional genomic locations and occurs at interior sites within many transcripts. Sequence determinations of four different cDNAs of O. volvulus, each containing an internal copy of the SL within a conserved 25mer, and one corresponding genomic DNA clone indicate that this sequence is not trans spliced onto these RNAs, but is encoded within the genes. The RNAs of two of these cDNAs appear to be developmentally regulated, since they occur in adult O. volvulus but were not detected in the infective L3 stage larvae. In contrast, actin mRNAs are present at all developmental stages, and at least one actin mRNA species contains a trans-spliced 5' SL. The internal locations of the SL in various transcripts and its perfect sequence conservation among parasitic and free-living nematodes argues that it serves specific, and perhaps multiple, functions for these organisms.
journal_name
Mol Cell Bioljournal_title
Molecular and cellular biologyauthors
Zeng WL,Alarcon CM,Donelson JEdoi
10.1128/mcb.10.6.2765subject
Has Abstractpub_date
1990-06-01 00:00:00pages
2765-73issue
6eissn
0270-7306issn
1098-5549journal_volume
10pub_type
杂志文章abstract::Although the primary function of U1 snRNA is to define the 5' donor site of an intron, it can also block the accumulation of a specific RNA transcript when it binds to a donor sequence within its terminal exon. This work was initiated to investigate if this property of U1 snRNA could be exploited as an effective metho...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.21.8.2815-2825.2001
更新日期:2001-04-01 00:00:00
abstract::One of the central questions in eukaryotic transcription is how activators can transmit their signal to stimulate gene expression in the context of chromatin. The multisubunit SAGA coactivator complex has both histone acetyltransferase and deubiquitination activities and remodels chromatin to allow transcription. Whet...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.01076-08
更新日期:2009-03-01 00:00:00
abstract::The E1a gene of adenovirus encodes two proteins, 289 and 243 amino acids long, which have positive (transactivator) and negative (enhancer repressor) RNA polymerase II transcriptional regulatory properties and cell transformation activities including cooperation with an activated ras gene. The E1a transforming functio...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.8.5.2177
更新日期:1988-05-01 00:00:00
abstract::The nuclear receptor transcription factor, nor-1, is expressed during mammalian development predominantly in the nervous system and is induced in a cell-specific manner in nonneuronal cells in response to a variety of extracellular stimuli. To elucidate the essential developmental functions of this transcription facto...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.24.20.9070-9078.2004
更新日期:2004-10-01 00:00:00
abstract::The TIS11 primary response gene is rapidly and transiently induced by both 12-O-tetradecanoylphorbol-13-acetate and growth factors. The predicted TIS11 protein contains a 6-amino-acid repeat, YKTELC. We cloned two additional cDNAs, TIS11b and TIS11d, that contain the YKTELC sequence. TIS11, TIS11b, and TIS11d proteins...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.11.3.1754
更新日期:1991-03-01 00:00:00
abstract::Two alternative exons, BEK and K-SAM, code for part of the ligand binding site of fibroblast growth factor receptor 2. Splicing of these exons is mutually exclusive, and the choice between them is made in a tissue-specific manner. We identify here pre-mRNA sequences involved in controlling splicing of the K-SAM exon. ...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.15.9.4825
更新日期:1995-09-01 00:00:00
abstract::The cellular response to DNA damage is an intricate mechanism that involves the interplay among several pathways. In this study, we provide evidence of the roles of the polyadenylation factor cleavage stimulation factor 50 (CstF-50) and the ubiquitin (Ub) escort factor p97 as cofactors of BRCA1/BARD1 E3 Ub ligase, fac...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.00364-17
更新日期:2018-01-29 00:00:00
abstract::The extensive array of basic helix-loop-helix (bHLH) transcription factors and their combinations as dimers underpin the diversity of molecular function required for cell type specification during embryogenesis. The bHLH factor TWIST1 plays pleiotropic roles during development. However, which combinations of TWIST1 di...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.00663-19
更新日期:2020-05-14 00:00:00
abstract::Nuclear factor kappa B (NF-kappa B) is a ubiquitous transcription factor which binds to decameric DNA sequences (kappa B sites) and regulates transcription of multiple genes. The activity of NF-kappa B is regulated by an inhibitor protein, I kappa B, which sequesters NF-kappa B in the cytoplasm. Release of I kappa B a...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.14.5.3276
更新日期:1994-05-01 00:00:00
abstract::The major histocompatibility complex class II (MHC-II) locus includes a dense cluster of genes that function to initiate immune responses. Expression of insulator CCCTC binding factor (CTCF) was found to be required for expression of all MHC class II genes associated with antigen presentation. Ten CTCF sites that divi...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.00327-10
更新日期:2010-09-01 00:00:00
abstract::The SF-21 insect cell line undergoes rapid and widespread apoptosis when treated with actinomycin D or when infected with a mutant of the baculovirus Autographa californica nuclear polyhedrosis virus lacking a p35 gene or a functionally active iap (inhibitor of apoptosis) gene. Here we provide evidence that the basis ...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.14.8.5212
更新日期:1994-08-01 00:00:00
abstract::The human neuroblastoma cell line CHP100 provides a useful model system in which to study the molecular mechanisms of transcriptional regulation of the low-affinity nerve growth factor receptor (NGFR) gene during neuronal development. Basic fibroblast growth factor (bFGF) induced morphological changes in CHP100 cells,...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.12.5.2193
更新日期:1992-05-01 00:00:00
abstract::Phosphorylation is believed to be one of the mechanisms by which p53 becomes activated or stabilized in response to cellular stress. Previously, p53 was shown to interact with three components of transcription factor IIH (TFIIH): excision repair cross-complementing types 2 and 3 (ERCC2 and ERCC3) and p62. This communi...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.17.10.5923
更新日期:1997-10-01 00:00:00
abstract::Platelet-derived growth factor alpha receptor (PDGF alpha R) is a transmembrane tyrosine kinase receptor for all three existing PDGF isoforms, AA, AB, and BB. Transcripts of PDGF alpha R are detected as early as in fertilized mouse eggs and throughout adulthood in a time- and space-specific manner, thereby suggesting ...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.16.2.712
更新日期:1996-02-01 00:00:00
abstract::Transfection of a functional cloned p53 gene into an L12 p53 nonproducer cell line efficiently reconstituted p53 expression. The p53 protein synthesized in these clones was indistinguishable from that occurring naturally in tumor cells. When a p53 cDNA clone was used instead, we observed that the L12-derived clones ex...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.6.9.3232
更新日期:1986-09-01 00:00:00
abstract::The adenovirus type 5 early region 1A (E1A) gene was introduced into neu-transformed B104-1-1 cells. Cells that expressed E1A possessed reduced transforming activity in vitro and reduced tumorigenicity in nude mice. These results demonstrate that the E1A gene products can act negatively to suppress the transformed phe...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.11.3.1745
更新日期:1991-03-01 00:00:00
abstract::Nuclear migration and positioning within cells are critical for many developmental processes and are governed by the cytoskeletal network. Although mechanisms of nuclear-cytoskeletal attachment are unclear, growing evidence links a novel family of nuclear envelope (NE) proteins that share a conserved C-terminal SUN (S...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.26.10.3738-3751.2006
更新日期:2006-05-01 00:00:00
abstract::The Eph receptors are the largest known family of receptor tyrosine kinases and are notable for distinctive expression patterns in the nervous system and in early vertebrate development. However, all were identified as orphan receptors, and only recently have there been descriptions of a corresponding family of ligand...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.15.9.4921
更新日期:1995-09-01 00:00:00
abstract::Several factors that mediate activation by nuclear receptors also modify the chemical and structural composition of chromatin. Prominent in this diverse group is the steroid receptor coactivator 1 (SRC-1) family, which interact with agonist-bound nuclear receptors, thereby coupling them to multifunctional transcriptio...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.20.20.7541-7549.2000
更新日期:2000-10-01 00:00:00
abstract::Transcriptional silencing in Saccharomyces cerevisiae occurs at specific loci and is mediated by a multiprotein complex that includes Rap1p and the Sir proteins. We studied the function of a recently identified gene, DOT4, that disrupts silencing when overexpressed. DOT4 encodes an ubiquitin processing protease (hydro...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.19.10.6608
更新日期:1999-10-01 00:00:00
abstract::MicroRNA 155 (miR-155) is an oncomir, generated as a noncoding RNA from the BIC gene whose promoter activity is mainly controlled via activation protein 1 (AP-1) and NF-κB transcription factors. We found that the expression levels of miR-155 and programmed cell death 4 (Pdcd4) exhibit inverse relationships in tongue c...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.00410-18
更新日期:2019-03-01 00:00:00
abstract::We have investigated the site of surface expression of the neuraminidase (NA) glycoprotein of influenza A virus, which, in contrast to the hemagglutinin, is bound to membranes by hydrophobic residues near the NH2-terminus. Madin-Darby canine kidney or primary African green monkey kidney cells infected with influenza A...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.5.9.2181
更新日期:1985-09-01 00:00:00
abstract::The Src homology 2-containing phosphotyrosine phosphatase (SHP2) is primarily a positive effector of receptor tyrosine kinase signaling. However, the molecular mechanism by which SHP2 effects its biological function is unknown. In this report, we provide evidence that defines the molecular mechanism and site of action...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.23.21.7875-7886.2003
更新日期:2003-11-01 00:00:00
abstract::The human immunodeficiency virus type 1 Rev protein contains a nuclear export signal (NES) that is required for Rev-mediated RNA export in mammals as well as in the yeast Saccharomyces cerevisiae. The Rev NES has been shown to specifically interact with a human (hRIP/RAB1) and a yeast (yRip1p) protein in the two-hybri...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.16.12.7144
更新日期:1996-12-01 00:00:00
abstract::Saccharomyces mating-type switching occurs through a double-strand break-initiated gene conversion event at MAT, using one of two donors located distantly on the same chromosome, HMLalpha and HMRa. MATa cells preferentially choose HMLalpha, a decision that depends on the recombination enhancer (RE) that controls recom...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.02443-05
更新日期:2006-07-01 00:00:00
abstract::Allelic forms of DRG1/AFG2 confer resistance to the drug diazaborine, an inhibitor of ribosome biogenesis in Saccharomyces cerevisiae. Our results show that the AAA-ATPase Drg1 is essential for 60S maturation and associates with 60S precursor particles in the cytoplasm. Functional inactivation of Drg1 leads to an incr...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.00668-07
更新日期:2007-10-01 00:00:00
abstract::Neural retina leucine zipper (Nrl), a key basic motif leucine zipper (bZIP) transcription factor, modulates rod photoreceptor differentiation by activating rod-specific target genes. In searching for factors that might couple with Nrl to modulate its transcriptional activity through posttranslational modification, we ...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.06440-11
更新日期:2012-05-01 00:00:00
abstract::The PHR1 gene of Saccharomyces cerevisiae encodes a photolyase which repairs specifically and exclusively pyrimidine dimers, the most frequent lesions induced in DNA by far-UV radiation. We have asked whether expression of PHR1 is modulated in response to UV-induced DNA damage and to DNA-damaging agents that induce le...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.10.9.4630
更新日期:1990-09-01 00:00:00
abstract::MOT1 is an essential Saccharomyces cerevisiae protein and a member of the SNF2/SWI2 family of ATPases. MOT1 functions by removing TATA-binding protein (TBP) from DNA, and as a consequence, MOT1 can regulate transcription both in vitro and in vivo. Here we describe the in vivo and in vitro activities of MOT1 deletion a...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.17.8.4842
更新日期:1997-08-01 00:00:00
abstract::We show that the nuclear genes for the cytoplasmic and mitochondrial leucyl-tRNA synthetase (LeuRS) of Neurospora crassa are distinct in their encoded proteins, codon usage, mRNA levels, and regulation. The 4.2-kilobase-pair region representing the structural gene for cytoplasmic LeuRS and flanking regions has been se...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.9.11.4645
更新日期:1989-11-01 00:00:00