5k8b

X-ray structure of KdnA, 8-amino-3,8-dideoxy-alpha-D-manno-octulosonate transaminase, from Shewanella oneidensis in the presence of the external aldimine with PLP and glutamate

spinqualitylabelsall models 5k8b, resolution 2.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5k8b is a 4 chain structure with sequence from Sheon. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, NA, PDG Related: 5k8c Gene: kdnA, SO_2476 (SHEON) Activity: 8-amino-3,8-dideoxy-alpha-D-manno-octulosonate transaminase, with EC number 2.6.1.109 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [KDNA_SHEON] Catalyzes the second (last) step of the biosynthesis of Kdo8N (8-amino-3,8-dideoxy-D-manno-octulosonate) from Kdo (3-deoxy-D-manno-octulosonate). 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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