2Z86: Crystal structure of chondroitin polymerase from Escherichia coli strain K4 (K4CP) complexed with UDP-GlcUA and UDP

Citation:
Abstract
Elongation of glycosaminoglycan chains, such as heparan and chondroitin, is catalyzed by bi-functional glycosyltransferases, for which both 3-dimensional structures and reaction mechanisms remain unknown. The bacterial chondroitin polymerase K4CP catalyzes elongation of the chondroitin chain by alternatively transferring the GlcUA and GalNAc moiety from UDP-GlcUA and UDP-GalNAc to the non-reducing ends of the chondroitin chain. Here, we have determined the crystal structure of K4CP in the presence of UDP and UDP-GalNAc as well as with UDP and UDP-GlcUA. The structures consisted of two GT-A fold domains in which the two active sites were 60A apart. UDP-GalNAc and UDP-GlcUA were found at the active sites of the N-terminal and C-terminal domains, respectively. The present K4CP structures have provided the structural basis for further investigating the molecular mechanism of biosynthesis of chondroitin chain.
PDB ID: 2Z86Download
MMDB ID: 66712
PDB Deposition Date: 2007/9/3
Updated in MMDB: 2008/09
Experimental Method:
x-ray diffraction
Resolution: 2.4  Å
Source Organism:
Similar Structures:
Biological Unit for 2Z86: dimeric; determined by author
Molecular Components in 2Z86
Label Count Molecule
Proteins (2 molecules)
2
Chondroitin Synthase
Molecule annotation
Chemicals (8 molecules)
1
3
2
4
3
1
* Click molecule labels to explore molecular sequence information.

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