Key residues in subsite F play a critical role in the activity of Pseudomonas fluoresecens subspecies cellulosa xylanase A against xylooligosaccharides but not against highly polymeric substrates such as xylan.

Charnock S. J., Lakey J. H., Virden R., Hughes N., Sinnott M. L., Hazlewood G. P., Pickersgill R., Gilbert H. J.. (1997)

Journal of Biological Chemistry, 272, 2942-2951