BIOL 2051 : Chapter 6 Notes (97% in the course
Document Summary
Virus structure capsids replication proteins: capsid- protein coat surrounding nucleic acid, capsid are arranged to give virion symmetry. Icosahedral capsids (poliovirus, herpes virus: roughly spherical. 20 equilateral triangles or faces filamentous capsids m13, ebola. Genome inside tube: tube made up of 100s of identical protein subunits, tube length reflects size of vial genome. Complex capsids: mixture of icosahedral & filamentous shapes, many bacteriophage viruses that infect bacteria specifically. Asymmetrical (irregular) shapes: tend to be larger viruses, poxviruses like cowpox. Includes genes encoding viral proteins: capsid proteins, envelope protein if virus is enveloped, any polymerase for copying its genome that is not found in host cell for replication. International committee on taxonomy of viruses classification system based on: genome composition. Single or double stranded dna double stranded rna etc. Classified by baltimore method david balitmore wanted to categorize viruses based on genome composition. Presence or absence of host derived envelope: size of virus particle.
