Difference between revisions of "3187043"

From CellBiology
(pRb)
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'''Retinoblastoma Protein'''
  
'''Retinoblastoma Protein'''
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The retinoblastoma protein, also known as pRb or p105, is a tumor suppressor protein which is 
  
 
named from a chidhood cancer where it was first discovered
 
named from a chidhood cancer where it was first discovered
rb inhibits the cell cycle
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== Structure ==
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== Function ==
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pRb inhibits the cell cycle
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becomes inactive when it is phosphorylated by protein cyclin-dependent kinases Cdk4 and Cdk2, unblocking and allowing the cell to pass the restriction point in order to progress from the G1 phase into the S phase of the cell cycle. Prior to this crutial step, the activation of Cdk4 and Cdk2 must occur through the synthesis and binding of cyclins D and E to Cdk4 and Cdk2, respectively, which form cyclin-cdk complexes.
 
becomes inactive when it is phosphorylated by protein cyclin-dependent kinases Cdk4 and Cdk2, unblocking and allowing the cell to pass the restriction point in order to progress from the G1 phase into the S phase of the cell cycle. Prior to this crutial step, the activation of Cdk4 and Cdk2 must occur through the synthesis and binding of cyclins D and E to Cdk4 and Cdk2, respectively, which form cyclin-cdk complexes.
  

Revision as of 18:04, 16 May 2009

Retinoblastoma Protein

The retinoblastoma protein, also known as pRb or p105, is a tumor suppressor protein which is

named from a chidhood cancer where it was first discovered


Structure

Function

pRb inhibits the cell cycle

becomes inactive when it is phosphorylated by protein cyclin-dependent kinases Cdk4 and Cdk2, unblocking and allowing the cell to pass the restriction point in order to progress from the G1 phase into the S phase of the cell cycle. Prior to this crutial step, the activation of Cdk4 and Cdk2 must occur through the synthesis and binding of cyclins D and E to Cdk4 and Cdk2, respectively, which form cyclin-cdk complexes.

Purves et al. Life The Science Of Biology 7E

"previous studies indicate that the HCV RNA-dependent RNA polymerase, nonstructural protein 5B (NS5B), forms a complex with the retinoblastoma tumor suppressor protein (pRb), targeting it for degradation, activating E2F-responsive promoters, and stimulating cellular proliferation....the abundance of pRb is strongly downregulated, and its normal nuclear localization altered to include a major cytoplasmic component..."

http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2323300&tool=pmcentrez&rendertype=abstract

Structure-function analysis of the retinoblastoma tumor suppressor protein – is the whole a sum of its parts?

Human papillomavirus immortalization and transformation functions