3MR2

Human DNA polymerase eta in complex with normal DNA and incoming nucleotide (Nrm)

Summary for 3MR2

• Entry DOI: 10.2210/pdb3mr2/pdb
• Related: 3MR3 3MR4 3MR5 3MR6
• Descriptor: DNA polymerase eta, DNA (5'-D(*T*CP*AP*TP*TP*AP*TP*GP*AP*CP*GP*CP*T)-3'), DNA (5'-D(*TP*AP*GP*CP*GP*TP*CP*AP*T)-3'), ... (7 entities in total)
• Functional Keywords: pol eta, polymerase, thymine dimer, cpd, xpv, xeroderma pigmentosum variant, dna damage, transferase-dna complex, transferase/dna
• Biological source: Homo sapiens (human)
• Cellular location: Nucleus: Q9Y253
• Total number of polymer chains: 3
• Total formula weight: 56871.67

Authors

Biertumpfel, C.,Zhao, Y.,Ramon-Maiques, S.,Gregory, M.T.,Lee, J.Y.,Yang, W. (deposition date: 2010-04-28, release date: 2010-06-30, Last modification date: 2024-02-21)

Primary citation

Biertumpfel, C.,Zhao, Y.,Kondo, Y.,Ramon-Maiques, S.,Gregory, M.,Lee, J.Y.,Masutani, C.,Lehmann, A.R.,Hanaoka, F.,Yang, W.
Structure and mechanism of human DNA polymerase eta.
Nature, 465:1044-1048, 2010

PubMed Abstract: The variant form of the human syndrome xeroderma pigmentosum (XPV) is caused by a deficiency in DNA polymerase eta (Poleta), a DNA polymerase that enables replication through ultraviolet-induced pyrimidine dimers. Here we report high-resolution crystal structures of human Poleta at four consecutive steps during DNA synthesis through cis-syn cyclobutane thymine dimers. Poleta acts like a 'molecular splint' to stabilize damaged DNA in a normal B-form conformation. An enlarged active site accommodates the thymine dimer with excellent stereochemistry for two-metal ion catalysis. Two residues conserved among Poleta orthologues form specific hydrogen bonds with the lesion and the incoming nucleotide to assist translesion synthesis. On the basis of the structures, eight Poleta missense mutations causing XPV can be rationalized as undermining the molecular splint or perturbing the active-site alignment. The structures also provide an insight into the role of Poleta in replicating through D loop and DNA fragile sites.

PubMed: 20577208
DOI: 10.1038/nature09196

Experimental method

X-RAY DIFFRACTION (1.83 Å)