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Heterogeneous nuclear ribonucleoprotein complexes
Molecular Biology Reports, 1990Heterogeneous nuclear r ibonuc leopro te ins (hnRNPs) associate with RNA polymerase II transcripts immediately following the initiation of transcription to form hnRNP complexes. These structures are the functional assemblies within which hnRNAs and pre-mRNAs exist in the nucleus.
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Enzyme activity of nuclear ribonucleoproteins
Experimental Cell Research, 1977Abstract Ultrastructural localization of β-glycerophosphatase, glucose-6-phosphatase, ATPase and NAD pyrophosphorylase was investigated in isolated mouse liver nuclei. β-Glycerophosphatase activity was found in interchromatin granules, in nuclear membranes, perinuclear space, and in nuclear pores.
E. Unger, I.B. Buchwalow
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Ribonuclease P: a ribonucleoprotein enzyme
Current Opinion in Chemical Biology, 2000The ribonucleoprotein ribonuclease P catalyzes the hydrolysis of a specific phosphodiester bond in precursor tRNA to form the mature 5' end of tRNA. Recent studies have shed light on the structures of RNase-P-RNA-P-protein and RNase-P-RNA-precursor-tRNA complexes, as well as on the positions of catalytic metal ions, emphasizing the importance of the ...
Jeffrey C. Kurz, Carol A. Fierke
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Ribonucleoprotein complexes in neurologic diseases
Current Opinion in Neurobiology, 2008Ribonucleoprotein (RNP) complexes regulate the tissue-specific RNA processing and transport that increases the coding capacity of our genome and the ability to respond quickly and precisely to the diverse set of signals. This review focuses on three proteins that are part of RNP complexes in most cells of our body: TAR DNA-binding protein (TDP-43), the
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Clinical Implications of Ribonucleoprotein Antibody
Archives of Dermatology, 1987Out of 97 patients with circulating ribonucleoprotein antibodies, 44 (45%) satisfied the criteria for systemic sclerosis, systemic lupus erythematosus, polymyositis/dermatomyositis, or rheumatoid arthritis. Forty-two (43%) of the 97 patients whose cases did not fulfill these criteria had at least two of the following three clinical manifestations ...
Mimi Høier-Madsen +4 more
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Isolation of messenger-like ribonucleoproteins
Biochemistry, 1975Subribosomal and polyribosomal messenger ribonucleoproteins (mRNPs) were isolated from Ehrlich ascites tumor cells by a method involving sedimentation of polyribosomal and subribosomal particles, dissociation with EDTA, and rate-zonal sedimentation.
Denise N. David +3 more
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Ribonucleoprotein localization in mouse oocytes
Methods, 2011RNA molecules rarely function alone in cells. For most RNAs, their function requires formation of various ribonucleoprotein (RNP) complexes. For example, mRNP composition can determine mRNA localization, translational repression, level of translation or mRNA stability. RNPs are usually studied by biochemical methods. However, biochemical approaches are
Matyas Flemr, Petr Svoboda
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Dissociation of macromolecular ribonucleoprotein of yeast
Archives of Biochemistry and Biophysics, 1957Abstract In 0.01 M KH 2 PO 4 K 2 HPO 4 (1:4) the omission of MgSO 4 causes the dissociation of the 80 S particles into two components which have sedimentation coefficients of 60 S and 40 S , respectively. Recombination of the 60 S and 40 S particles to form the 80 S particles takes place when 0.001 M MgSO 4 or 0.001 M CaCl 2 is ...
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Is the spliceosome a ribonucleoprotein enzyme?
Nature Structural & Molecular Biology, 2008New work suggests that Prp8, a highly conserved protein in the heart of the spliceosome, both orients the substrate and participates in catalysis.
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Cytodifferentiation induced by ribonucleoproteins
Experientia, 1961S. Ranzi, G. Gavarosi, P. Citterio
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