Taxonomy- Classification

What are the FIVE things that can help you classification of a virus?

Nature and sequence of viral genome

Symmetry of protein shell (capsid)

Presence or absence of lipid membrane (envelope)

Size of virus particle

Replication characteristics and disease

Today most of the viruses is classified by what?

Nature and sequence of viral genome

What is the order of taxonomy?

Realm

Kingdom

Phylum

Class

Order

Family

Genus

Species

What are the FIVE things that can make up the virus's structure?

Nucleic Acid

Capsid and Nucleocapsid

Envelope

Envelope glycoproteins or

Peplomers (spike proteins)

Matrix proteins (tegument)

The viral genome can be made up of what TWO things?

DNA

RNA

Describe RNA to me

Single stranded

Linear

Segmented

ssRNA positive

Describe DNA to me.

Double stranded

Circular

Non segmented

negative sense strand

What are the TWO types of capsid symmetry viruses can have?

icosahedral symmetry

helical symmetry

What does it mean to have helical symmetry?

arranged in a helix

What does it mean to have icosahedral symmetry?

a geometric shape with 20 sides, each composed of an equilateral triangle,

What are the TWO broad functions of structural proteins?

protection of the genome

delivery of the genome

How do structural proteins help to protect the genome? (3)

Assembly of a stable protective protein shell

Specific recognition and packaging of the nucleic acid

Interaction with host cell membranes to form the envelope and exit the cell

How do structural proteins help with delivery to the genome? ( 4 steps)

Bind to host cell receptors

Uncoating of the genome

Fusion with cell membranes

Transport of genome to the appropriate site