Crystal structure of DNA polymerase lambda complexed with a two nucleotide gap DNA molecule
[DPOLL_HUMAN] Repair polymerase. Involved in base excision repair (BER) responsible for repair of lesions that give rise to abasic (AP) sites in DNA. Has both DNA polymerase and terminal transferase activities. Has a 5'-deoxyribose-5-phosphate lyase (dRP lyase) activity. 
Publication Abstract from PubMed
Human DNA polymerase lambda (Pol lambda) is a family X member with low frameshift fidelity that has been suggested to perform gap-filling DNA synthesis during base excision repair and during repair of broken ends with limited homology. Here, we present a 2.1 A crystal structure of the catalytic core of Pol lambda in complex with DNA containing a two nucleotide gap. Pol lambda makes limited contacts with the template strand at the polymerase active site, and superimposition with Pol beta in a ternary complex suggests a shift in the position of the DNA at the active site that is reminiscent of a deletion intermediate. Surprisingly, Pol lambda can adopt a closed conformation, even in the absence of dNTP binding. These observations have implications for the catalytic mechanism and putative DNA repair functions of Pol lambda.
A structural solution for the DNA polymerase lambda-dependent repair of DNA gaps with minimal homology.,Garcia-Diaz M, Bebenek K, Krahn JM, Blanco L, Kunkel TA, Pedersen LC Mol Cell. 2004 Feb 27;13(4):561-72. PMID:14992725
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.