This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

6cbi

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Current revision

PCNA in complex with inhibitor

Structural highlights

6cbi is a 10 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
NonStd Res:
Gene:	PCNA (HUMAN)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[PCNA_HUMAN] Auxiliary protein of DNA polymerase delta and is involved in the control of eukaryotic DNA replication by increasing the polymerase's processibility during elongation of the leading strand. Induces a robust stimulatory effect on the 3'-5' exonuclease and 3'-phosphodiesterase, but not apurinic-apyrimidinic (AP) endonuclease, APEX2 activities. Has to be loaded onto DNA in order to be able to stimulate APEX2. Plays a key role in DNA damage response (DDR) by being conveniently positioned at the replication fork to coordinate DNA replication with DNA repair and DNA damage tolerance pathways. Acts as a loading platform to recruit DDR proteins that allow completion of DNA replication after DNA damage and promote postreplication repair: Monoubiquitinated PCNA leads to recruitment of translesion (TLS) polymerases, while 'Lys-63'-linked polyubiquitination of PCNA is involved in error-free pathway and employs recombination mechanisms to synthesize across the lesion.^[1] ^[2]

Publication Abstract from PubMed

The human sliding clamp (PCNA) controls access to DNA for many proteins involved in DNA replication and repair. Proteins are recruited to the PCNA surface by means of a short, conserved peptide motif known as the PCNA-interacting protein box (PIP-box). Inhibitors of these essential protein-protein interactions may be useful as cancer therapeutics by disrupting DNA replication and repair in these highly proliferative cells. PIP-box peptide mimetics have been identified as a potentially rapid route to potent PCNA inhibitors. Here we describe the rational design and synthesis of the first PCNA peptidomimetic ligands, based on the high affinity PIP-box sequence from the natural PCNA inhibitor p21. These mimetics incorporate covalent i,i+4 side-chain/side-chain lactam linkages of different lengths, designed to constrain the peptides into the 310-helical structure required for PCNA binding. NMR studies confirmed that while the unmodified p21 peptide had little defined structure in solution, mimetic ACR2 pre-organised into 310-helical structure prior to interaction with PCNA. ACR2 displayed higher affinity binding than most known PIP-box peptides, and retains the native PCNA binding mode, as observed in the co-crystal structure of ACR2 bound to PCNA. This study offers a promising new strategy for PCNA inhibitor design for use as anti-cancer therapeutics.

Rational design of a 310-helical PIP-box mimetic targeting PCNA - the human sliding clamp.,Wegener KL, McGrath AE, Dixon NE, Oakley AJ, Scanlon DB, Abell AD, Bruning J Chemistry. 2018 Jun 19. doi: 10.1002/chem.201801734. PMID:29917264^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Burkovics P, Hajdu I, Szukacsov V, Unk I, Haracska L. Role of PCNA-dependent stimulation of 3'-phosphodiesterase and 3'-5' exonuclease activities of human Ape2 in repair of oxidative DNA damage. Nucleic Acids Res. 2009 Jul;37(13):4247-55. doi: 10.1093/nar/gkp357. Epub 2009, May 13. PMID:19443450 doi:10.1093/nar/gkp357
↑ Motegi A, Liaw HJ, Lee KY, Roest HP, Maas A, Wu X, Moinova H, Markowitz SD, Ding H, Hoeijmakers JH, Myung K. Polyubiquitination of proliferating cell nuclear antigen by HLTF and SHPRH prevents genomic instability from stalled replication forks. Proc Natl Acad Sci U S A. 2008 Aug 26;105(34):12411-6. Epub 2008 Aug 21. PMID:18719106 doi:0805685105
↑ Wegener KL, McGrath AE, Dixon NE, Oakley AJ, Scanlon DB, Abell AD, Bruning J. Rational design of a 310-helical PIP-box mimetic targeting PCNA - the human sliding clamp. Chemistry. 2018 Jun 19. doi: 10.1002/chem.201801734. PMID:29917264 doi:http://dx.doi.org/10.1002/chem.201801734

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6cbi"

@@ Line 1: / Line 1: @@
 ==PCNA in complex with inhibitor==
-<StructureSection load='6cbi' size='340' side='right' caption='[[6cbi]], [[Resolution|resolution]] 2.75&Aring;' scene=''>
+<StructureSection load='6cbi' size='340' side='right'caption='[[6cbi]], [[Resolution|resolution]] 2.75&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6cbi]] is a 10 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6CBI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6CBI FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6cbi]] is a 10 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6CBI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6CBI FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=DAB:2,4-DIAMINOBUTYRIC+ACID'>DAB</scene></td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PCNA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
 <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6cbi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6cbi OCA], [http://pdbe.org/6cbi PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6cbi RCSB], [http://www.ebi.ac.uk/pdbsum/6cbi PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6cbi ProSAT]</span></td></tr>
 </table>
@@ Line 19: / Line 20: @@
 </div>
 <div class="pdbe-citations 6cbi" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Proliferating cell nuclear antigen 3D structures|Proliferating cell nuclear antigen 3D structures]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
+[[Category: Human]]
+[[Category: Large Structures]]
 [[Category: Bruning, J B]]
 [[Category: Wegener, K L]]

6cbi

From Proteopedia

Current revision

PCNA in complex with inhibitor

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox