1.1.5.8 gene qdh, DNA and amino acid sequence determination and analysis, sequence comparisons and phylogenetic analysis, expression in pyrroloquinoline quinone synthesizing Pseudomonas putida strain HK5 1.1.5.8 gene quiA, DNA and amino acid sequence determination and analysis, phylogenetic analysis and tree, heterologous expression of QDH in Gluconobacter frateurii, improvement of the heterologous expression of QDH in Gluconobacter strains using a broad-host-range plasmid, best with a long 5'-UTR. Gluconobacter oxydans strain NBRC12528 DELTAadhA::KmR is transformed by triparental mating using Escherichia coli HB101 harboring pRK2013 as the helper strain, Gluconobacter frateurii strain SEI46 (DELTAadhAB) is transformed with the same plasmids by electroporation 1.1.5.8 gene quiA, DNA and amino acid sequence determination and analysis, phylogenetic analysis and tree, QDH translates from the second TTG codon: Met-His-Ser-Ile-Asp, heterologous expression of QDH in Gluconobacter frateurii, improvement of the heterologous expression of QDH in Gluconobacter strains using a broad-host-range plasmid, best with a long 5'-UTR. Gluconobacter oxydans strain NBRC12528 DELTAadhA::KmR is transformed by triparental mating using Escherichia coli HB101 harboring pRK2013 as the helper strain, Gluconobacter frateurii strain SEI46 (DELTAadhAB) is transformed with the same plasmids by electroporation. Change of the initiation codon to ATG does not improve QDH activity but results in expression levels similar to those achieved with the wild-type plasmid