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The influenza B virus genome is 14,548 nucleotides long and consists of eight segments of linear negative-sense, single-stranded RNA.The multipartite genome is encapsidated, each segment in a separate nucleocapsid, and the nucleocapsids are surrounded by one envelope.
The M2 protein of influenza B is 109 residue long, homo-tetramer and is a functional homolog of influenza A protein. There is almost no sequence homology between influenza AM2 and BM2 except for the HXXXW sequence motif in the TMS that is essential for channel function. Its proton conductance pH profile is similar to that of AM2.
Influenza viruses also encode various accessory proteins, ... Influenza B viruses contain a surface protein named NB that is anchored in the envelope, but its ...
Influenza B virus is almost exclusively a human pathogen, and is less common than influenza A. The only other animal known to be susceptible to influenza B infection is the seal. [47] This type of influenza mutates at a rate 2–3 times lower than type A [48] and consequently is less genetically diverse, with only one influenza B serotype. [26]
Hemagglutinin is a class I fusion protein, [1] [2] having multifunctional activity as both an attachment factor and membrane fusion protein. Therefore, HA is responsible for binding influenza viruses to sialic acid on the surface of target cells, such as cells in the upper respiratory tract or erythrocytes , [ 3 ] resulting in the ...
The NS1 influenza protein (NS1) is a viral nonstructural protein encoded by the NS gene segments of type A, B and C influenza viruses. Also encoded by this segment is the nuclear export protein (NEP), formerly referred to as NS2 protein, which mediates the export of influenza virus ribonucleoprotein (RNP) complexes from the nucleus into the ...
There are four different types of influenza virus: A, B, C, and D. Influenza C usually causes only mild illness while D mostly affects animals, especially cattle.
A viral regulatory and accessory protein is a type of viral protein that can play an indirect role in the function of a virus. [1] An example is Nef. References
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