Two main families of motor proteins mediate transport along microtubules:

Kinesins 

Dyneins

TLS Online TPP Program

#Id: 2311

#Unit 3. Fundamental Processes

P-TEFb activates elongation, splicing and polyadenylation and phosphorylates

  Serine 2 CTD

  TAT-SF1

  SPT5

TLS Online TPP Program

#Id: 2312

#Unit 3. Fundamental Processes

Ser2 phosphatase Fcp1 regenerates RNA Pol II pool

TLS Online TPP Program

#Id: 2313

#Unit 3. Fundamental Processes

Splicing is an SN2 reaction that proceeds through a pentavalent phosphorous intermediate.

TLS Online TPP Program

#Id: 2314

#Unit 3. Fundamental Processes

There are three type of Splicing Machinery

 

TLS Online TPP Program

#Id: 2315

#Unit 3. Fundamental Processes

The group I and group II introns have the remarkable ability to excise themselves from an RNA. This is called auto-splicing, or self-splicing. 

Group I introns are more common than group II introns.

TLS Online TPP Program

#Id: 2316

#Unit 3. Fundamental Processes

Two transesterification reactions takes place for 2 exon -1 intron configuration. First transesterification is catalysed variably either by external G or branch point while second transesterification is always caused by exon 1 -3’OH.