4f4x

Y-family DNA polymerase chimera Dbh-Dpo4-Dpo4 #2

spinqualitylabelsall models 4f4x, resolution 2.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4f4x is a 3 chain structure with sequence from Sulac. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, DCP Related: 4f4w, 4f4y, 4f4z, 4f50 Gene: dbh, Dpo4 (S. solfataricus) and Dbh (S. acidocaldarius), Saci_0554, dpo4, SSO2448 (SULAC) Activity: DNA-directed DNA polymerase, with EC number 2.7.7.7 Resources: FirstGlance, OCA, RCSB, PDBsum Function [DPO4_SULAC] Poorly processive, error-prone DNA polymerase involved in untargeted mutagenesis. Copies undamaged DNA at stalled replication forks, which arise in vivo from mismatched or misaligned primer ends. These misaligned primers can be extended by PolIV. Exhibits no 3'-5' exonuclease (proofreading) activity. May be involved in translesional synthesis (By similarity). Publication Abstract from PubMed Y-family polymerases help cells tolerate DNA damage by performing translesion synthesis opposite damaged DNA bases, yet they also have a high intrinsic error rate. We constructed chimeras of two closely related Y-family polymerases that display distinctly different activity profiles and found that the polypeptide linker that tethers the catalytic polymerase domain to the C-terminal DNA-binding domain is a major determinant of overall polymerase activity, nucleotide incorporation fidelity, and abasic site-bypass ability. Exchanging just 3 out of the 15 linker residues is sufficient to interconvert the polymerase activities tested. Crystal structures of four chimeras show that the conformation of the protein correlates with the identity of the interdomain linker sequence. Thus, residues that are more than 15 A away from the active site are able to influence many aspects of polymerase activity by altering the relative orientations of the catalytic and DNA-binding domains. Y-Family Polymerase Conformation Is a Major Determinant of Fidelity and Translesion Specificity.,Wilson RC, Jackson MA, Pata JD Structure. 2012 Dec 11. pii: S0969-2126(12)00420-0. doi:, 10.1016/j.str.2012.11.005. PMID:23245850 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase

Proteopedia Page Contributors and Editors (what is this?)

OCA