Converts 4-O-beta-D-mannopyranosyl-D-glucopyranose (Man-Glc) to mannose 1-phosphate (Man1P) and glucose. Involved in a mannan catabolic pathway which feeds into glycolysis. 4-O-beta-D-mannopyranosyl-D-glucopyranose + phosphate = alpha-D-mannose 1-phosphate + D-glucose Optimum pH is 7. Optimum temperature is 50 degrees Celsius. Belongs to the glycosyl hydrolase 130 family.