免疫学信息网 . rf-c is a five-subunit complex all subunits are related in sequence and have...

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Page 1: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Page 2: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Page 3: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Page 4: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Page 5: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

RF-C is a five-subunit complexAll subunits are related in sequence and have ATP binding motifsATP hydrolysis by RF-C is associated with the loading of PCNARF-C is the functional homolog of the clamp-loader complex

Page 6: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Page 7: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Polymerase switching occurs even on lagging strands; pol does most of DNA synthesis

Page 8: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Page 9: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

How do you think the PCNA is removed after ligation?

Page 10: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Page 11: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

PCNA interacts with RF-C, pol , Fen1, DNA ligase,CAF1 and MCMT

Several of these have a common motifused in the interaction: Q-X-X-L/I/M-X-X-F-F/Y

p21/CIP1/WAF1, a protein induced by the tumor suppressor p53 uses the same motifto interact with PCNA

What effect is p21 expected to have on DNA replication/repair?

Page 12: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

FEN1 interacts with PCNA

Page 13: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

DNA Helicase

* Helicase binds ss DNA

* Hydrolyzes ATP to move alongssDNA and peel of substrate DNA

* Can move 5‘ to 3’ or 3‘to 5’ or in both directions on ssDNAand is classified as such

* Dimers or hexamers

P P

5‘ 3‘

3‘ 5‘ 5‘3‘

Substra

te

Boiled su

bstra

te

+he

licas

e

+helic

ase+

ATP

15mer 30mer

15mer30mer

Page 14: 免疫学信息网 . RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis

免疫学信息网 http://www.immuneweb.com

Conserved helicase motifs:

Includes the following for ATPbinding and hydrolysisI = Walker A motif GxGxGKTII = Walker B motif DEad

Binds ATP

Tight conformation

Hydrolyzes ATP

Relaxed conformation

Helicases are ATP driven molecular motors