3rwk | pdb_00003rwk

First crystal structure of an endo-inulinase, from Aspergillus ficuum: structural analysis and comparison with other GH32 enzymes.

spinqualitylabelsall models 3rwk, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3rwk is a 1 chain structure with sequence from Aspergillus ficuum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Ligands: ACT, BMA, FRU, MAN, NA, NAG, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function INU2_ASPFI Endo-inulinase involved in utilization of the plant storage polymer inulin, consisting of fructooligosaccharides with a degree of polymerization (DP) value from 2 to 60. Publication Abstract from PubMed Endo-inulinase is a member of glycosidase hydrolase family 32 (GH32) degrading fructans of the inulin type with an endo-cleavage mode and is an important class of industrial enzyme. In the present study, we report the first crystal structure of an endo-inulinase, INU2, from Aspergillus ficuum at 1.5 A. It was solved by molecular replacement with the structure of exo-inulinase as search model. The 3D structure presents a bimodular arrangement common to other GH32 enzymes: a N-terminal 5-fold beta-propeller catalytic domain with four beta-sheets and a C-terminal beta-sandwich domain organized in two beta-sheets with five beta-strands. The structural analysis and comparison with other GH32 enzymes reveal the presence of an extra pocket in the INU2 catalytic site, formed by two loops and the conserved motif W-M(I)-N-D(E)-P-N-G. This cavity would explain the endo-activity of the enzyme, the critical role of Trp40 and particularly the cleavage at the third unit of the inulin(-like) substrates. Crystal structure at 2.1 A of INU2 complexed with fructosyl molecules, experimental digestion data and molecular modelling studies support these hypotheses. First crystal structure of an endo-inulinase, INU2, from Aspergillus ficuum: Discovery of an extra-pocket in the catalytic domain responsible for its endo-activity.,Pouyez J, Mayard A, Vandamme AM, Roussel G, Perpete EA, Wouters J, Housen I, Michaux C Biochimie. 2012 Jun 28. PMID:22750808 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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