LINA02H3 Chapter Notes - Chapter 3: Virus, Capsid, Plasmodesma
Document Summary
Large complex viruses have many capsid proteins and scaffolding proteins make structural proteins to package them: scaffolding proteins. New virion made and infecting cell if the host cell is: Virus spreads through the cell wall through the plasmodesmata. Cross- injection, that eat on plant cells. Virus: genome (not infectious), needs to be packaged. Virions need to: assemble, exit the cell that they"re made in, withstand the extracellular environ, attach to and enter another cell, release the viral genome. Info that determines 3d structure is built: the packaged rna or dna, how the proteins subunits bind to each other. Icosahedral symmetry (left) vs capsids with helical symmetry (helical) Capsids of many viruses are constructed as shells with icosahedral symmetry. Genome bind to protein subunits and winds down. Bind to fixed number of nucleotides in genome. If each were different, you would waste genome on each.
