[转移贴]求解 双粒病毒组

cao1976

原贴由demonsboy发表于 2011-5-16 11:35
http://biosky.haotui.com/thread-22274-1-5.html?jdfwkey=ni0d61

如题，双粒病毒组（geminivirus）为一组植物单链圆环病毒，那么双粒怎么解释呢？

cao1976

jbclinnic 发表于 2011-5-16 13:29 :

Geminiviruses are plant viruses which have single-stranded circular DNA genomes encoding genes that diverge in both directions from a virion strand origin of replication (i.e. geminivirus genomes are ambisense). According to the Baltimore classification they are considered class II viruses. The genome can either be a single component between 2500-3100 nucleotides, or, in the case of some begomoviruses, two similar-sized components each between 2600 and 2800 nucleotides. They have elongated, geminate capsids with two incomplete T=1 icosahedra joined at the missing vertex. The capsids range in size from 18-20 nm in diameter with a length of about 30 nm. Begomoviruses with two component (i.e. bipartite) genomes have these components separated into two different particles both of which must usually be transmitted together to initiate a new infection within a suitable host cell.