140 likes | 281 Views
RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis by RF-C is associated with the loading of PCNA RF-C is the functional homolog of the clamp-loader g complex. Polymerase switching occurs even on lagging strands;
E N D
RF-C is a five-subunit complex All subunits are related in sequence and have ATP binding motifs ATP hydrolysis by RF-C is associated with the loading of PCNA RF-C is the functional homolog of the clamp-loader g complex 免疫学信息网http://www.immuneweb.com
Polymerase switching occurs even on lagging strands; pol d does most of DNA synthesis 免疫学信息网http://www.immuneweb.com
How do you think the PCNA is removed after ligation? 免疫学信息网http://www.immuneweb.com
PCNA interacts with RF-C, pol d, Fen1, DNA ligase, CAF1 and MCMT Several of these have a common motif used 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 motif to interact with PCNA What effect is p21 expected to have on DNA replication/repair? 免疫学信息网http://www.immuneweb.com
FEN1 interacts with PCNA 免疫学信息网http://www.immuneweb.com
DNA Helicase * Helicase binds ss DNA * Hydrolyzes ATP to move along ssDNA and peel of substrate DNA * Can move 5‘ to 3’ or 3‘to 5’ or in both directions on ssDNA and is classified as such * Dimers or hexamers 免疫学信息网http://www.immuneweb.com
Helicases are ATP driven molecular motors Conserved helicase motifs: Includes the following for ATP binding and hydrolysis I = Walker A motif GxGxGKT II = Walker B motif FFFDEad 免疫学信息网http://www.immuneweb.com