Question: Which enzymes are involved in global genome nucleotide excision repair (GG-NER) in bacteria?

Context:
we evaluated the in vivo role of NER in the repair of DNA adducts generated by psoralens (mono- or bi-functional) and UV-A light (PUVA) in E. coli. Cultures of wild-type E. coli K12 and mutants for uvrA, uvrB, uvrC or uvrAC genes were treated with PUVA and cell survival was determined.
Nucleotide excision repair (NER) is universally used to recognize and remove many types of DNA damage. In eubacteria, the NER system typically consists of UvrA, UvrB, UvrC, the UvrD helicase, DNA polymerase I, and ligase.
During nucleotide excision repair (NER) in bacteria the UvrC nuclease and the short oligonucleotide that contains the DNA lesion are removed from the post-incision complex by UvrD, a superfamily 1A helicase.
UvrD interacts with UvrB, a component of the post-incision complex.
PcrA helicase from Bacillus stearothermophilus can also displace UvrC and the excised oligonucleotide from a post-incision NER complex, which supports the idea that PcrA performs a UvrD-like function during NER in gram-positive organisms.
Cho rather than UvrC seems to be an effective nuclease for the NER of DPCs.
Nucleotide excision repair consists of excinuclease protein UvrABC endonuclease, multi-enzymatic complex which carries out repair of damaged DNA in sequential manner.
Escherichia coli K12 mutant strains deficient in nucleotide excision repair (NER) were submitted to increasing concentrations of cisplatin, and the results revealed that uvrA and uvrB mutants are sensitive to this agent, while uvrC and cho mutants remain as the wild type strain.
we used a genetic approach to investigate the roles of nucleotide excision repair (NER) pathway components in H. pylori mutation and recombination. RESULTS: Inactivation of any of the four uvr genes strongly increased the susceptibility of H. pylori to DNA damage by ultraviolet light. Inactivation of uvrA and uvrB significantly decreased mutation frequencies whereas only the uvrA deficient mutant exhibited a significant decrease of the recombination frequency after natural transformation. A uvrC mutant did not show significant changes in mutation or recombination rates; however, inactivation of uvrC promoted the incorporation of significantly longer fragments of donor DNA (2.2-fold increase) into the recipient chromosome. A deletion of uvrD induced a hyper-recombinational phenotype.
Transcription-coupled DNA repair (TCR) is a subpathway of nucleotide excision repair (NER) that is triggered when RNA polymerase is stalled by DNA damage. Lesions targeted by TCR are repaired more quickly than lesions repaired by the transcription-independent "global" NER pathway, but the mechanism underlying this rate enhancement is not understood. Damage recognition during bacterial NER depends upon UvrA, which binds to the damage and loads UvrB onto the DNA. Bacterial TCR additionally requires the Mfd protein, a DNA translocase that removes the stalled transcription complexes.

Answer: Nucleotide excision repair (NER) is universally used to recognize and remove many types of DNA damage. In eubacteria, the NER system typically consists of UvrA, UvrB, UvrC, the UvrD helicase, DNA polymerase I, and ligase.  Damage recognition during bacterial NER depends upon UvrA, which binds to the damage and loads UvrB onto the DNA. Subsequently, UvrA, UvrB and UvrC form the excinuclease protein UvrABC endonuclease, a multi-enzymatic complex which carries out repair of damaged DNA in sequential manner. In some cases, Cho may be the effective nuclease for NER, rather than UvrC. UvrC nuclease and the short oligonucleotide that contains the DNA lesion are removed from the post-incision complex by UvrD, a superfamily 1A helicase. In gram-positive organisms, PcrA helicase can also displace UvrC and the excised oligonucleotide from a post-incision NER complex.
Exact answer: UvrA
UvrB
UvrC nuclease
UvrD 1A helicase
DNA polymerase I
Ligase
Cho nuclease (instead of UvrC)
PcrA helicase (instead of Uvrd, in gram-positive bacteria)