Structural insights into the processivity of endopolygalacturonase I from Aspergillus niger.
van Pouderoyen, G., Snijder, H.J., Benen, J.A., Dijkstra, B.W.(2003) FEBS Lett 554: 462-466
- PubMed: 14623112 
- DOI: 10.1016/s0014-5793(03)01221-3
- Primary Citation of Related Structures:  
1NHC - PubMed Abstract: 
Endopolygalacturonase I is a processive enzyme, while the 60% sequence identical endopolygalacturonase II is not. The 1.70 A resolution crystal structure of endopolygalacturonase I reveals a narrowed substrate binding cleft. In addition, Arg96, a residue in this cleft previously shown to be critical for processivity, interacts with the substrate mimics glycerol and sulfate in several well-defined conformations in the six molecules in the asymmetric unit ...