1v6y
From Proteopedia
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Crystal Structure Of chimeric Xylanase between Streptomyces Olivaceoviridis E-86 FXYN and Cellulomonas fimi Cex
Overview
The catalytic domain of xylanases belonging to glycoside hydrolase family, 10 (GH10) can be divided into 22 modules (M1 to M22; Sato, Y., Niimura, Y., Yura, K., and Go, M. (1999) Gene (Amst.) 238, 93-101). Inspection of, the crystal structure of a GH10 xylanase from Streptomyces olivaceoviridis, E-86 (SoXyn10A) revealed that the catalytic domain of GH10 xylanases can, be dissected into two parts, an N-terminal larger region and C-terminal, smaller region, by the substrate binding cleft, corresponding to the, module border between M14 and M15. It has been suggested that the topology, of the substrate binding clefts of GH10 xylanases are not conserved, (Charnock, S. J., Spurway, T. D., Xie, H., Beylot, M. H., Virden, R., Warren, R. A. J., Hazlewood, G. P., and Gilbert, H. J. (1998) J. Biol., Chem. 273, 32187-32199). To facilitate a greater understanding of the, structure-function relationship of the substrate binding cleft of GH10, xylanases, a chimeric xylanase between SoXyn10A and Xyn10A from, Cellulomonas fimi (CfXyn10A) was constructed, and the topology of the, hybrid substrate binding cleft established. At the three-dimensional, level, SoXyn10A and CfXyn10A appear to possess 5 subsites, with the amino, acid residues comprising subsites -3 to +1 being well conserved, although, the +2 subsites are quite different. Biochemical analyses of the chimeric, enzyme along with SoXyn10A and CfXyn10A indicated that differences in the, structure of subsite +2 influence bond cleavage frequencies and the, catalytic efficiency of xylooligosaccharide hydrolysis. The hybrid enzyme, constructed in this study displays fascinating biochemistry, with an, interesting combination of properties from the parent enzymes, resulting, in a low production of xylose.
About this Structure
1V6Y is a Single protein structure of sequence from Streptomyces olivaceoviridis and cellulomonas fimi. Active as Endo-1,4-beta-xylanase, with EC number 3.2.1.8 Full crystallographic information is available from OCA.
Reference
Structure and function of a family 10 beta-xylanase chimera of Streptomyces olivaceoviridis E-86 FXYN and Cellulomonas fimi Cex., Kaneko S, Ichinose H, Fujimoto Z, Kuno A, Yura K, Go M, Mizuno H, Kusakabe I, Kobayashi H, J Biol Chem. 2004 Jun 18;279(25):26619-26. Epub 2004 Apr 12. PMID:15078885
Page seeded by OCA on Sun Nov 25 04:39:22 2007
