6cst

From Proteopedia

(Difference between revisions)

Revision as of 08:46, 8 January 2020

Structure of human DNA polymerase kappa with DNA

Structural highlights

6cst is a 6 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, , , , , , ,
Gene:	POLK, DINB1 (HUMAN)
Activity:	DNA-directed DNA polymerase, with EC number 2.7.7.7
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[POLK_HUMAN] DNA polymerase specifically involved in DNA repair. Plays an important role in translesion synthesis, where the normal high-fidelity DNA polymerases cannot proceed and DNA synthesis stalls. Depending on the context, it inserts the correct base, but causes frequent base transitions, transversions and frameshifts. Lacks 3'-5' proofreading exonuclease activity. Forms a Schiff base with 5'-deoxyribose phosphate at abasic sites, but does not have lyase activity.^[1] ^[2] ^[3] ^[4] ^[5] ^[6] ^[7]

Publication Abstract from PubMed

Human polymerase kappa (polkappa) is a distinct Y-family DNA polymerase with a unique N-terminal N-clasp domain. The N-clasp renders polkappa's high efficiency and accuracy in DNA replication and lesion bypass. How N-clasp empowers polkappa in replication remains unclear due to the disordering of N-clasp. Here, we present a 2.0-A resolution crystal structure of a polkappa ternary complex with DNA and an incoming nucleotide. The structure-function study reveals an ordered N-clasp domain that brings conserved and functionally important residues in contact with the replicating basepair in the active site and contributes to the nucleotidyl transfer reaction. Particularly, a fully ordered Lys25 from the N-clasp domain is in H-bonding with the alpha- and gamma-phosphates of the incoming nucleotide. K25A mutation reduces the polymerase activity of polkappa significantly. This lysine is structurally analogous to a conserved lysine in the A-family DNA polymerases in the closed form. In contrast, Lys25 in the previous structures of polkappa does not have any contacts with the incoming nucleotide, resembling an open form of a DNA polymerase. Based on structural and functional similarity, we propose a local open/closed mechanism for polkappa in DNA replication catalysis, which mimics the common mechanism for all DNA polymerases.

2.0 A resolution crystal structure of human polkappa reveals a new catalytic function of N-clasp in DNA replication.,Jha V, Ling H Sci Rep. 2018 Oct 11;8(1):15125. doi: 10.1038/s41598-018-33371-5. PMID:30310122^[8]

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

References

↑ Ogi T, Kato T Jr, Kato T, Ohmori H. Mutation enhancement by DINB1, a mammalian homologue of the Escherichia coli mutagenesis protein dinB. Genes Cells. 1999 Nov;4(11):607-18. PMID:10620008
↑ Gerlach VL, Feaver WJ, Fischhaber PL, Friedberg EC. Purification and characterization of pol kappa, a DNA polymerase encoded by the human DINB1 gene. J Biol Chem. 2001 Jan 5;276(1):92-8. PMID:11024016 doi:http://dx.doi.org/10.1074/jbc.M004413200
↑ Fischhaber PL, Gerlach VL, Feaver WJ, Hatahet Z, Wallace SS, Friedberg EC. Human DNA polymerase kappa bypasses and extends beyond thymine glycols during translesion synthesis in vitro, preferentially incorporating correct nucleotides. J Biol Chem. 2002 Oct 4;277(40):37604-11. Epub 2002 Jul 26. PMID:12145297 doi:10.1074/jbc.M206027200
↑ Haracska L, Prakash L, Prakash S. Role of human DNA polymerase kappa as an extender in translesion synthesis. Proc Natl Acad Sci U S A. 2002 Dec 10;99(25):16000-5. Epub 2002 Nov 20. PMID:12444249 doi:10.1073/pnas.252524999
↑ Wolfle WT, Washington MT, Prakash L, Prakash S. Human DNA polymerase kappa uses template-primer misalignment as a novel means for extending mispaired termini and for generating single-base deletions. Genes Dev. 2003 Sep 1;17(17):2191-9. PMID:12952891 doi:http://dx.doi.org/10.1101/gad.1108603
↑ Haracska L, Prakash L, Prakash S. A mechanism for the exclusion of low-fidelity human Y-family DNA polymerases from base excision repair. Genes Dev. 2003 Nov 15;17(22):2777-85. PMID:14630940 doi:10.1101/gad.1146103
↑ Yasui M, Suzuki N, Miller H, Matsuda T, Matsui S, Shibutani S. Translesion synthesis past 2'-deoxyxanthosine, a nitric oxide-derived DNA adduct, by mammalian DNA polymerases. J Mol Biol. 2004 Nov 26;344(3):665-74. PMID:15533436 doi:S0022-2836(04)01222-7
↑ Jha V, Ling H. 2.0 A resolution crystal structure of human polkappa reveals a new catalytic function of N-clasp in DNA replication. Sci Rep. 2018 Oct 11;8(1):15125. doi: 10.1038/s41598-018-33371-5. PMID:30310122 doi:http://dx.doi.org/10.1038/s41598-018-33371-5

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/6cst"

@@ Line 1: / Line 1: @@
 ==Structure of human DNA polymerase kappa with DNA==
-<StructureSection load='6cst' size='340' side='right' caption='[[6cst]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
+<StructureSection load='6cst' size='340' side='right'caption='[[6cst]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6cst]] is a 6 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6CST OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6CST FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6cst]] is a 6 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=6CST OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6CST FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=DZ4:2-DEOXY-5-O-[(R)-HYDROXY{[(R)-HYDROXY(PHOSPHONOOXY)PHOSPHORYL]AMINO}PHOSPHORYL]ADENOSINE'>DZ4</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=IOD:IODIDE+ION'>IOD</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</scene></td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">POLK, DINB1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA-directed_DNA_polymerase DNA-directed DNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.7 2.7.7.7] </span></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=6cst FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6cst OCA], [http://pdbe.org/6cst PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6cst RCSB], [http://www.ebi.ac.uk/pdbsum/6cst PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6cst ProSAT]</span></td></tr>
@@ Line 19: / Line 20: @@
 </div>
 <div class="pdbe-citations 6cst" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[DNA polymerase 3D structures|DNA polymerase 3D structures]]
 == References ==
 <references/>
@@ Line 24: / Line 28: @@
 </StructureSection>
 [[Category: DNA-directed DNA polymerase]]
+[[Category: Human]]
+[[Category: Large Structures]]
 [[Category: Jha, V]]
 [[Category: Ling, H]]

6cst

From Proteopedia

Revision as of 08:46, 8 January 2020

Structure of human DNA polymerase kappa with DNA

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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