Hydrolysis of terminal, non-reducing beta-D-glucosyl residues with release of beta-D-glucose. Glycosylated. The polyoligosaccharides are of the high-mannose type and are highly substituted with both phosphate and sulfate moieties. Belongs to the glycosyl hydrolase 3 family. PubMed:8288612 reports 2 different N-termini by direct protein sequencing: mature protein either starts at Ile-70 or Ser-74.