Structural highlights
5k8c is a 1 chain structure with sequence from Sheon. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
|
| Ligands: | , , , , |
| Gene: | kdnB, SO_2477 (SHEON) |
| Activity: | 3-deoxy-alpha-D-manno-octulosonate 8-oxidase, with EC number 1.1.3.48 |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
[KDNB_SHEON] Catalyzes the first step of the biosynthesis of Kdo8N (8-amino-3,8-dideoxy-D-manno-octulosonate) from Kdo (3-deoxy-D-manno-octulosonate).[1]
Publication Abstract from PubMed
8-amino-3,8-dideoxy-d-manno-octulosonic acid (Kdo8N) is a unique amino sugar that has thus far only been observed on the lipopolysaccharides of marine bacteria belonging to the genus Shewanella. Although its biological function is still unclear, it is thought that the sugar is important for the integrity of the bacterial cell outer membrane. A three-gene cluster required for the biosynthesis of Kdo8N was first identified in Shewanella oneidensis. Here we describe the three-dimensional structures of two of the enzymes required for Kdo8N biosynthesis in S. oneidensis, namely KdnB and KdnA. The structure of KdnB was solved to 1.85-A resolution, and its overall three-dimensional architecture places it into the Group III alcohol dehydrogenase family. A previous study suggested that KdnB did not require NAD(P) for activity. Strikingly, although the protein was crystallized in the absence of any cofactors, the electron density map clearly revealed the presence of a tightly bound NAD(H). In addition, a bound metal ion was observed, which was shown via X-ray fluorescence to be a zinc ion. Unlike other members of the Group III alcohol dehydrogenases, the dinucleotide cofactor in KdnB is tightly bound and cannot be removed without leading to protein precipitation. With respect to KdnA, it is a pyridoxal 5'-phosphate or (PLP)-dependent aminotransferase. For this analysis, the structure of KdnA, trapped in the presence of the external aldimine with PLP and glutamate, was determined to 2.15-A resolution. The model of KdnA represents the first structure of a sugar aminotransferase that functions on an 8-oxo sugar. Taken together the results reported herein shed new molecular insight into the biosynthesis of Kdo8N.
Structures of KdnB and KdnA from Shewanella oneidensis: Key Enzymes in the Formation of 8-Amino-3,8-Dideoxy-D-Manno-Octulosonic Acid.,Zachman-Brockmeyer TR, Thoden JB, Holden HM Biochemistry. 2016 Jun 8. PMID:27275764[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Gattis SG, Chung HS, Trent MS, Raetz CR. The origin of 8-amino-3,8-dideoxy-D-manno-octulosonic acid (Kdo8N) in the lipopolysaccharide of Shewanella oneidensis. J Biol Chem. 2013 Mar 29;288(13):9216-25. doi: 10.1074/jbc.M113.453324. Epub 2013, Feb 14. PMID:23413030 doi:http://dx.doi.org/10.1074/jbc.M113.453324
- ↑ Zachman-Brockmeyer TR, Thoden JB, Holden HM. Structures of KdnB and KdnA from Shewanella oneidensis: Key Enzymes in the Formation of 8-Amino-3,8-Dideoxy-D-Manno-Octulosonic Acid. Biochemistry. 2016 Jun 8. PMID:27275764 doi:http://dx.doi.org/10.1021/acs.biochem.6b00439
