File:Fimmu-09-01581-g001.jpg
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[edit]DescriptionFimmu-09-01581-g001.jpg |
English: Influenza A and B viruses. (A) Schematic of the eight viral RNA (vRNA) gene segments that comprise the influenza A and B genomes. The 5′ and 3′ untranslated regions (UTRs), which contain the viral promoters, are represented with a line, and the box corresponds to the coding region within each vRNA. (B) Diagram of the viral mRNAs that are transcribed from the IAV (left) and IBV (right) vRNA templates. Boxes indicate the viral gene product encoded by each mRNA and the dashed lines show the alternative splicing of the IAV M and NS transcripts, as well as the IBV NS transcript. Red circles represent the 5′ M7pppG cap, black lines denote the 10–13 nucleotide, host-derived primers that are obtained by the cap-snatching mechanism of the viral polymerase. A(n) corresponds to the 3′ poly-A tail produced by reiterative stuttering of the viral polymerase. The smaller mRNAs (empty boxes) represent transcripts that encode nonessential accessory proteins found in many strains, whereas those that are less prevalent (PB2-S1, M42, and NS3) are not illustrated (6–11). (C) Diagram of an influenza A or B virus. The viral membrane proteins HA, NA, and M2 are shown, along with the eight viral ribonucleoproteins (vRNPs), and the matrix protein M1 that supports the viral envelope. To highlight the vRNP components, the illustration beneath the virus is not to scale. A single vRNA gene segment is shown wrapped around multiple nucleoprotein (NP) copies with the conserved promoter regions in the 5′ and 3′ UTRs forming a helical hairpin, which is bound by a single heterotrimeric viral RNA-dependent RNA polymerase (PB1, PB2, and PA). (D) Top view of an influenza virus cross-section showing the vRNP “1 + 7” configuration. vRNPs are depicted with black circles as it is not known if the positioning of a particular vRNP is conserved or interchangeable. |
Date | |
Source | https://www.frontiersin.org/articles/10.3389/fimmu.2018.01581/full |
Author | Dan Dou, Rebecca Revol, Henrik Östbye, Hao Wang, and Robert Daniels |
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Horizontal resolution | 500 dpi |
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Software used | Adobe Photoshop CS5 Windows |
File change date and time | 13:29, 17 July 2018 |
Color space | sRGB |
Date metadata was last modified | 18:59, 17 July 2018 |
Date and time of digitizing | 22:26, 9 July 2018 |
Unique ID of original document | uuid:5D20892493BFDB11914A8590D31508C8 |
IIM version | 39,338 |
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