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The influenza viral genome is composed of eight ribonucleoprotein particles formed by a complex of negative-sense RNA bound to a viral nucleoprotein. Each RNP carries with it an RNA polymerase complex. When the nucleoprotein binds to the viral RNA, it is able to expose the nucleotide bases which allow the viral polymerase to transcribe RNA. At ...
Influenza virus nucleoprotein (NP) is a structural protein which encapsidates the negative strand viral RNA.NP is one of the main determinants of species specificity. The question of how far the NP gene can cross the species barrier by reassortment and become adapted by mutation to the new host has been discussed.
The proteins are known to pack DNA more tightly than histones do. When expressed in eukaryotes that possess histones, they displace nucleosomes and impair translation. This action is thought to be one of the driving forces for dinoflagellates to switch to this protein instead of histone for packaging. [ 2 ]
Structure of nucleoprotein MA: The 50S ribosomal subunit from H. marismortui X-ray crystallographic model of 29 of the 33 native components, from the laboratory of Thomas Steitz. Of the 31 component proteins, 27 are shown (blue), along with its 2 RNA strands (orange/yellow). [1] Scale: assembly is approx. 24 nm across. [2]
DnaA is a protein that activates initiation of DNA replication in bacteria. [1] Based on the Replicon Model, a positively active initiator molecule contacts with a particular spot on a circular chromosome called the replicator to start DNA replication. [2]
The blunt ends of the DSB are processed into ssDNA with 3’ extensions, which allows RAD51 recombinase (eukaryotic homologue of prokaryotic RecA) to bind to it to form a nucleoprotein filament. [ 3 ] [ 10 ] The function of the filament is to locate the template DNA and form a joint heteroduplex molecule.
Lyssavirus genomes consist of a negative-sense, single-stranded RNA molecule that encodes five viral proteins: polymerase L, matrix protein M, phosphoprotein P, nucleoprotein N, and glycoprotein G. Genomes are linear, around 11kb in length. [3] Based on recent phylogenetic evidence, lyssaviruses have been categorized into seven major species ...
DNA replication also works by using a DNA template, the DNA double helix unwinds during replication, exposing unpaired bases for new nucleotides to hydrogen bond to. Gene synthesis, however, does not require a DNA template and genes are assembled de novo. DNA synthesis occurs in all eukaryotes and prokaryotes, as well as some viruses. The ...