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Fig. S1 Mutations and plasmids constructed in the xylE (a), xytA (b), xylR (c) and xytB (d) loci.

Fig. S2 Operons mapping in the xytA and xytB loci in the xylR mutant.

Fig. S3 Xylose induction motif of Caulobacter crescentus genes and the xyl-box motif of Xanthomonas campestris pv campestris ATCC33913 (Xcc-568). Sequence logos were generated by WebLogo (http://weblogo.berkeley.edu/; Crooks GE, Hon G, Chandonia JM, Brenner SE. 2004. WebLogo: a sequence logo generator. Genome Research 14: 1188–1190).

Fig. S4 Effect of pVO155 insertion into the xylR regulatory gene on expression of xylE, xylR, agu67A, axeXA, uxuB and xytB.

Fig. S5 Effect of pVO155 insertion into the agu67A gene on expression of xylR, agu67A, axeXA, uxuB, xyn10 and xytB.

Fig. S6 Analysis of in vitro secretion of Xyn10A, Xyn10C and Xyn30A putative xylanases.

Table S1 List of plasmids and Xanthomonas campestris pv campestris strains used or generated in this study

Table S2 Conservation of Xanthomonas campestris pv campestris ATCC33913 (LMG568) proteins encoded by genes induced by xylan, xylooligosaccharides or xylose, in Caulobacter crescentus CB15, Prevotella bryantii B14 or Bacteroides ovatus ATCC8483 proteomes

Table S3 Occurrence of perfect xyl-box motif upstream from Xanthomonas campestris pv campestris ATCC33913 genes

Table S4 Enzymes active on xylan

Method S1 Secretion assays of Xyn10A, Xyn10C and Xyn30A putative xylanases.