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pyrroloquinoline quinone biosynthesis protein PqqB
This HMM describes coenzyme PQQ biosynthesis protein B, a gene required for the biosynthesis of pyrrolo-quinoline-quinone (coenzyme PQQ). PQQ is required for some glucose dehydrogenases and alcohol dehydrogenases. Note that this gene appears to be required for PQQ in biosynthesis in Methylobacterium extorquens (under the name pqqG) and in Klebiella pneumoniae but that the equivalent pqqV in Acinetobacter calcoaceticus is not necessary for heterologous expression of PQQ biosynthesis in E. coli. Based on this latter finding, it is suggested (Goosen, et al. 1989) that PqqB might be a transporter or a PQQ-dependent enzyme rather than a PQQ biosynthesis enzyme.
MBL fold metallo-hydrolase
The MBL fold superfamily includes the metallo-beta-lactamases (class B beta-lactamases), but includes also a much larger family of hydrolases that are not beta-lactamases at all. See also the related family PF00753.
pyrroloquinoline quinone biosynthesis protein PqqB may be involved in the transport of pyrroloquinoline quinone (PQQ) and its precursor to the cytoplasm
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