1dli
From Proteopedia
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THE FIRST STRUCTURE OF UDP-GLUCOSE DEHYDROGENASE (UDPGDH) REVEALS THE CATALYTIC RESIDUES NECESSARY FOR THE TWO-FOLD OXIDATION
Overview
Bacterial UDP-glucose dehydrogenase (UDPGlcDH) is essential for formation, of the antiphagocytic capsule that protects many virulent bacteria such as, Streptococcus pyogenes andStreptococcus pneumoniae type 3 from the host's, immune system. We have determined the X-ray structures of both native and, Cys260Ser UDPGlcDH from S. pyogenes (74% similarity to S. pneumoniae) in, ternary complexes with UDP-xylose/NAD(+) and UDP-glucuronic acid/NAD(H), respectively. The 402 residue homodimeric UDPGlcDH is composed of an, N-terminal NAD(+) dinucleotide binding domain and a C-terminal UDP-sugar, binding domain connected by a long (48 A) central alpha-helix. The first, 290 residues of UDPGlcDH share structural homology with 6-phosphogluconate, dehydrogenase, including conservation of an active site lysine and, asparagine that are implicated in the enzyme mechanism. Also proposed to, participate in the catalytic mechanism are a threonine and a glutamate, that hydrogen bond to a conserved active site water molecule suitably, positioned for general acid/base catalysis.
About this Structure
1DLI is a Single protein structure of sequence from Streptococcus pyogenes with SO4, NAD, UDX and GOL as ligands. Active as UDP-glucose 6-dehydrogenase, with EC number 1.1.1.22 Full crystallographic information is available from OCA.
Reference
The first structure of UDP-glucose dehydrogenase reveals the catalytic residues necessary for the two-fold oxidation., Campbell RE, Mosimann SC, van De Rijn I, Tanner ME, Strynadka NC, Biochemistry. 2000 Jun 13;39(23):7012-23. PMID:10841783
Page seeded by OCA on Tue Nov 20 13:23:11 2007
