Variants of exoglucanases having improved actvity and uses thereof

An isolated or purified polypeptide characterized in that it has an improved exoglucanase activity compared with the exoglucanase activity of the CBH1 reference protein of SEQ ID NO:

• 2, said polypeptide being chosen from the group consisting of:
• i. an amino acid sequence chosen from SEQ ID NO:
• 16, SEQ ID NO:
• 6, SEQ ID NO:
• 12, SEQ ID NO:
• 18 and SEQ ID NO:
• 20;
• and
• ii. an amino acid sequence having, compared with the sequence SEQ ID NO:
• 6, SEQ ID NO:
• 12, SEQ ID NO:
• 16, SEQ ID NO:
• 18 or SEQ ID NO:
• 20, a percentage identity of at least 70%.