1I4V image
Deposition Date 2001-02-23
Release Date 2001-08-22
Last Version Date 2024-05-22
Entry Detail
PDB ID:
1I4V
Keywords:
Title:
SOLUTION STRUCTURE OF THE UMUD' HOMODIMER
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
20
Selection Criteria:
structures with the least restraint violations,structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:UMUD' PROTEIN
Mutations:G25A
Chain IDs:A, B
Chain Length:115
Number of Molecules:2
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Converting a DNA damage checkpoint effector (UmuD2C) into a lesion bypass polymerase (UmuD'2C).
EMBO J. 20 4287 4298 (2001)
PMID: 11483531 DOI: 10.1093/emboj/20.15.4287

Abstact

During the SOS response of Escherichia coli to DNA damage, the umuDC operon is induced, producing the trimeric protein complexes UmuD2C, a DNA damage checkpoint effector, and UmuD'2C (DNA polymerase V), which carries out translesion synthesis, the basis of 'SOS mutagenesis'. UmuD'2, the homodimeric component of DNA pol V, is produced from UmuD by RecA-facilitated self-cleavage, which removes the 24 N-terminal residues of UmuD. We report the solution structure of UmuD'2 (PDB ID 1I4V) and interactions within UmuD'-UmuD, a heterodimer inactive in translesion synthesis. The overall shape of UmuD'2 in solution differs substantially from the previously reported crystal structure, even though the topologies of the two structures are quite similar. Most significantly, the active site residues S60 and K97 do not point directly at one another in solution as they do in the crystal, suggesting that self-cleavage of UmuD might require RecA to assemble the active site. Structural differences between UmuD'2 and UmuD'- UmuD suggest that UmuD'2C and UmuD2C might achieve their different biological activities through distinct interactions with RecA and DNA pol III.

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Primary Citation of related structures