scholarly journals Estimation of ribosomal RNA transcription rate in situ

BioTechniques ◽  
2004 ◽  
Vol 36 (1) ◽  
pp. 134-138 ◽  
Author(s):  
Chunhua Cui ◽  
Hung Tseng
Keyword(s):  
Ribosomal Rna ◽  
Transcription Rate ◽  
Rna Transcription

scholarly journals Asymmetric reconstruction of mammalian reovirus reveals interactions among RNA, transcriptional factor µ2 and capsid proteins

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Muchen Pan ◽  
Ana L. Alvarez-Cabrera ◽  
Joon S. Kang ◽  
Lihua Wang ◽  
Chunhai Fan ◽  
...  
Keyword(s):  
Rna Polymerase ◽  
Molecular Interactions ◽  
Messenger Rna ◽  
Rna Binding ◽  
Capsid Proteins ◽  
Rna Transcription ◽  
Infectious Particle ◽  
Virion Assembly ◽  
Rna Capping

AbstractMammalian reovirus (MRV) is the prototypical member of genus Orthoreovirus of family Reoviridae. However, lacking high-resolution structures of its RNA polymerase cofactor μ2 and infectious particle, limits understanding of molecular interactions among proteins and RNA, and their contributions to virion assembly and RNA transcription. Here, we report the 3.3 Å-resolution asymmetric reconstruction of transcribing MRV and in situ atomic models of its capsid proteins, the asymmetrically attached RNA-dependent RNA polymerase (RdRp) λ3, and RdRp-bound nucleoside triphosphatase μ2 with a unique RNA-binding domain. We reveal molecular interactions among virion proteins and genomic and messenger RNA. Polymerase complexes in three Spinoreovirinae subfamily members are organized with different pseudo-D3d symmetries to engage their highly diversified genomes. The above interactions and those between symmetry-mismatched receptor-binding σ1 trimers and RNA-capping λ2 pentamers balance competing needs of capsid assembly, external protein removal, and allosteric triggering of endogenous RNA transcription, before, during and after infection, respectively.

scholarly journals Absence of rDNA amplification in the uninucleolate oocyte of the cockroach Blattella germanica (Oorthoptera: Blattidae).

1976 ◽  
Vol 71 (1) ◽  
pp. 49-58 ◽  
Author(s):  
M D Cave
Keyword(s):  
Ribosomal Rna ◽  
General Pattern ◽  
Blattella Germanica ◽  
Nucleolar Organizer ◽  
Extrachromosomal Dna ◽  
Total Dna ◽  
Cockroach Blattella Germanica ◽  
Rdna Amplification ◽  
Large Nucleolus

Amplification of the genes coding for ribosomal RNA oocurs in the oocytes of a wide variety of organisms. In oocytes of various species of crickets (Orthoptera: Gryllidae) the amplified DNA is contained in a large extrachromosomal DNA body. Multiple nucleoli form about the periphery of the DNA body during the diplotene stage of meiosis I. In contrast to the general pattern of orthopteran oocytes, oocytes of the cockroach Blattella germanica demonstrate a single large nucleolus instead of many nucleoli. In order to determine whether the genes coding for rRNA are amplified in the oocytes of B. germanica, the relative amount of rDNA in oocytes was compared with the rDNA content of spermatocytes and somatic cells. An extrachromosomal DNA body similar to that present in crickets is not present in B. germanica. A satellite DNA band which contains nucleotide sequences complementary to rRNA accounts for approximately 3-5% of the total DNA in somatic and in male and female gametogenic tissues. Female cells contain approximately twice as much rDNA as do male cells. An XX-XO sex-determining mechanism is operative in B. germanica. In situ hybridization with rRNA indicates that the nucleolar organizer is located on one end of the X chromosome and that oocytes do not contain more than twice the amount of rDNA found in spermato cytes. The data indicate that rDNA is not amplified in the uninucleolate oocyte of B germanica.

Regulation of eukaryotic ribosomal RNA transcription by RNA polymerase modification

Cell ◽  
1986 ◽  
Vol 47 (3) ◽  
pp. 445-450 ◽  
Author(s):  
Erik Bateman ◽  
Marvin R. Paule
Keyword(s):  
Rna Polymerase ◽  
Ribosomal Rna ◽  
Rna Transcription

scholarly journals BLM helicase facilitates RNA polymerase I-mediated ribosomal RNA transcription

2011 ◽  
Vol 21 (5) ◽  
pp. 1172-1183 ◽  
Author(s):  
Patrick M. Grierson ◽  
Kate Lillard ◽  
Gregory K. Behbehani ◽  
Kelly A. Combs ◽  
Saumitri Bhattacharyya ◽  
...  
Keyword(s):  
Rna Polymerase ◽  
Ribosomal Rna ◽  
Rna Polymerase I ◽  
Rna Transcription ◽  
Blm Helicase ◽  
Polymerase I

Detection of rRNA and phaseolin genes on polytene chromosomes of Phaseolus coccineus by fluorescence in situ hybridization after pepsin pretreatment

Genome ◽  
1994 ◽  
Vol 37 (6) ◽  
pp. 1018-1021 ◽  
Author(s):  
M. Nenno ◽  
K. Schumann ◽  
W. Nagl
Keyword(s):  
In Situ Hybridization ◽  
Fluorescence In Situ Hybridization ◽  
Ribosomal Rna ◽  
Storage Protein ◽  
Seed Storage Protein ◽  
Polytene Chromosomes ◽  
Seed Storage ◽  
Phaseolus Coccineus ◽  
Rna Genes

This is the first report of fluorescence in situ hybridization (FISH) on plant polytene chromosomes. Different protease pretreatments have been tested to improve fluorescence in situ hybridization FISH on polytene chromosomes of a plant, Phaseolus coccineus, with the aim to enable the detection of low-copy genes. The structural preservation of the chromosomes and the distinctness of the FISH signals were comparatively analysed with a probe for the ribosomal RNA genes after digestion with pepsin and trypsin. The pepsin pretreatment resulted in a general loosening of chromatin with good conservation of chromosome morphology and an increased number and density of signal points. The six nucleolus organizers exhibited significant differences in condensation. The pretreatment with pepsin enabled the detection of the low-copy genes encoding the seed storage protein phaseolin.Key words: plant, Leguminosae, ribosomal RNA genes, seed storage protein genes, protease.

scholarly journals Detection of the Ribosomal RNA Gene in Pear (Pyrus spp.) using Fluorescence in situ Hybridization

2010 ◽  
Vol 79 (4) ◽  
pp. 335-339 ◽  
Author(s):  
Masashi Yamamoto ◽  
Shingo Terakami ◽  
Toshiya Yamamoto ◽  
Norio Takada ◽  
Tatsuya Kubo ◽  
...  
Keyword(s):  
In Situ Hybridization ◽  
Fluorescence In Situ Hybridization ◽  
Ribosomal Rna ◽  
Ribosomal Rna Gene

Zinc-finger protein 545 is a novel tumour suppressor that acts by inhibiting ribosomal RNA transcription in gastric cancer

Gut ◽  
2012 ◽  
Vol 62 (6) ◽  
pp. 833-841 ◽  
Author(s):  
Shiyan Wang ◽  
Yingduan Cheng ◽  
Wan Du ◽  
Leina Lu ◽  
Liang Zhou ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Zinc Finger ◽  
Ribosomal Rna ◽  
Zinc Finger Protein ◽  
Tumour Suppressor ◽  
Rna Transcription ◽  
Finger Protein

scholarly journals SHPRH as a new player in ribosomal RNA transcription and its potential role in homeostasis of ribosomal DNA repeats

Transcription ◽  
2017 ◽  
Vol 9 (3) ◽  
pp. 190-195 ◽  
Author(s):  
Deokjae Lee ◽  
Jun Hong Park ◽  
Shinseog Kim ◽  
Seon-gyeong Lee ◽  
Kyungjae Myung
Keyword(s):  
Ribosomal Rna ◽  
Ribosomal Dna ◽  
Potential Role ◽  
Dna Repeats ◽  
Rna Transcription
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