The celA gene, encoding a glycosyl hydrolase family 3 beta-glucosidase in Azospirillum irakense, is required for optimal growth on cellobiosides.

@article{Faure2001TheCG,
  title={The celA gene, encoding a glycosyl hydrolase family 3 beta-glucosidase in Azospirillum irakense, is required for optimal growth on cellobiosides.},
  author={Denis Faure and Bernard Henrissat and Dave Ptacek and M A Bekri and Jozef Vanderleyden},
  journal={Applied and environmental microbiology},
  year={2001},
  volume={67 5},
  pages={2380-3}
}
The CelA beta-glucosidase of Azospirillum irakense, belonging to glycosyl hydrolase family 3 (GHF3), preferentially hydrolyzes cellobiose and releases glucose units from the C(3), C(4), and C(5) oligosaccharides. The growth of a DeltacelA mutant on these cellobiosides was affected. In A. irakense, the GHF3 beta-glucosidases appear to be functional alternatives for the GHF1 beta-glucosidases in the assimilation of beta-glucosides by other bacteria. 

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