The Trichoderma reesei cDNA coding for alpha-glucuronidase (GLRI), whi
ch releases glucuronic acid attached to xylose units of xylan, was clo
ned and sequenced. The deduced N-terminal amino acid (aa) sequence of
the protein was verified by sequencing of the purified GLRI. The aa se
quence of the GLRI displayed no similarity with any aa sequence availa
ble in the data bases.