Purification of XynA and mini-CbpA and assembly of XynA cellulosomes. (A) SDS-PAGE gel of the purified mini-CbpA and the purified XynA. Lane M, molecular weight markers; lane 1, purified mini-CbpA; lane 2, purified XynA. (B) Native PAGE analysis of purified mini-CbpA, purified XynA and the XynA-mini-CbpA complex (XynA cellulosome). Lane 1, purified mini-CbpA; lane 2, mixture of mini-CbpA and XynA; lane 3, purified XynA.