Pcna structure

Over the last years, various X-ray crystal structures of PCNA bound to peptides derived from PCNA -binding proteins have been determined. More recently, X-ray structures and lower-resolution structures of PCNA bound to . PCNA structure and function: insights from structures of. Dieckman LM(1), Freudenthal B Washington MT. Author information: (1)Department of Biochemistry, University of Iowa College of .

PCNA : structure , functions and interactions. Proliferating cell nuclear antigen (PCNA) plays an essential role in nucleic acid . Division of Biological and Environmental Sciences and Engineering, Laboratory of DNA Replication and. Recombination, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia. This protein is best known for its ability to confer high processivity to replicative DNA polymerases.

However, it does far more than this, because it forms a mobile platform on the . This toroidal-shaped protein encircles DNA and can slide bidirectionally along the duplex.

One of the well-established functions fo. Owing to this unique structure , PCNA is topologically linked to the double helix, encircling it, but it is still able to freely slide along the DNA lattice by virtue of theα -helices lining the inner channel. Thus, PCNA and its homologs increase the processivity of a polymerase by engaging in protein-protein interactions with its outer . The crystal structure of the processivity factor required by eukaryotic DNA polymerase δ, proliferating cell nuclear antigen ( PCNA ) from S. Three PCNA molecules, each containing two topologically identical domains, are tightly associated to form a closed . This review discusses eukaryotic PCNA , with an emphasis on plant PCNA , in terms of the protein structure and its biochemical properties as well as gene structure , organization, expression and function.

PCNA exerts a tripartite function by operating as (1) a sliding clamp during DNA synthesis, (2) a . Due to the functional and structural similarity with the β-subunit of Escherichia coli DNA polymerase III, it has been proposed that PCNA would act as a . Three PCNA mol- ecules, each containing two topologically identical do- mains, are tightly associated to form a closed ring. PCNA observed in this structure is not the conformation to which the non-classical polymerases bind. This implies that the ubiquitin moiety must either be capable of re-orienting itself on the back face of the PCNA ring or be capable of moving around to occupy other positions on the PCNA ring including . PCNA -complexed enzyme temporally switches between the polymerizing and editing modes. Here, we present the three- dimensional structure of the Pyrococcus furiosus DNA polymerase.

B- PCNA -DNA ternary complex, which is the core component of the replisome, determined by single particle . Analysis of the role of PCNA -DNA contacts during clamp loading. Binding ofMCL- Gadd45a, and CDKProteins to PCNA Is Not Direct or .

It forms a ring shaped structure of kDa by the symmetric association of three identical protomers. PCNA is an essential factor for DNA replication and repair. The ring encircles the DNA and acts as a docking platform for other proteins, most of them containing the PCNA Interaction Protein sequence .