title: Glycerol assimilation and production of 1,3-propanediol by Citrobacter amalonaticus Y19.
abstract: Citrobacter amalonaticus Y19 (Y19) was isolated because of its ability for carbon monoxide-dependent hydrogen production (water-gas shift reaction). This paper reports the assimilation of glycerol and the production of 1,3-propanediol (1,3-PDO) by Y19. Genome sequencing revealed that Y19 contained the genes for the utilization of glycerol and 1,2-propanediol (pdu operon) along with those for the synthesis of coenzyme B12 (cob operon). On the other hand, it did not possess the genes for the fermentative metabolism of glycerol of Klebsiella pneumoniae, which consists of both the oxidative (dhaD and dhaK) and reductive (dhaB and dhaT) pathways. In shake-flask cultivation under aerobic conditions, Y19 could grow well with glycerol as the sole carbon source and produced 1,3-PDO. The level of 1,3-PDO production was improved when vitamin B12 was added to the culture medium under aerobic conditions. Under anaerobic conditions, cell growth and 1,3-PDO production on glycerol was also possible, but only when an exogenous electron acceptor, such as nitrate or fumarate, was added. This is the first report of the glycerol metabolism and 1,3-PDO production by C. amalonaticus Y19.
authors: Department of Chemical and Biomolecular Engineering, Pusan National University, San 30, Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea.
authors: Satish Kumar
authors: SK
authors: Ainala
authors: Somasundar
authors: S
authors: Ashok
authors: Yeounjoo
authors: Y
authors: Ko
authors: Sunghoon
authors: S
authors: Park
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D002954:Citrobacter / Q000254:growth & development / Q000378:metabolism*; D003470:Culture Media / Q000737:chemistry; D016680:Genome, Bacterial; D005990:Glycerol / Q000378:metabolism*; D053858:Metabolic Networks and Pathways / Q000235:genetics; D008969:Molecular Sequence Data; D011409:Propylene Glycols / Q000378:metabolism*; D017422:Sequence Analysis, DNA; D014805:Vitamin B 12 / Q000378:metabolism
chemical_list: D003470:Culture Media; D011409:Propylene Glycols; C041787:1,3-propanediol; D014805:Vitamin B 12; D005990:Glycerol