Table 1. Catalytic activity of recombinant xylanase A and the FliC(XynA) fusion protein in the monomeric and polymeric forms.

Sample	OD575	D-xylose deliberated (µg/ml)
native xylanase A	0.175	26.7
FliC(XynA) monomer	0.156	23.8
FliC/FliC(XynA) copolymer 2∶1 (w/w)	0.153	23.3
FliC/FliC(XynA) copolymer 1∶1 (w/w)	0.163	24.9

Measurements were done at 1.2 µM enzyme (catalytic unit) concentration in 50 mM phosphate buffer (pH 6.0) at 37°C. The amount of FliC(XynA) subunits incorporated into the copolymers was estimated by densitometric analysis of SDS-PA gels of filament samples.