Belong to the P2 1 monoclinic space group, have substantially the unit lattice constant a = 57.6Å, b = 85.5Å, c = 80.5Å, and β = 106.9 °, one in the asymmetric unit crystal of chondroitin AC lyase of Arthrobacter derived from bacteria belonging to the genus having a molecular, and has the activity of chondroitin AC lyase, the amino acid sequence Asn-Trp-Trp- (Xaa) 7 -Arg- (Xaa) 34 -Gln- (Xaa or Asp (Asn) -) 4 -Arg- (Xaa) 8 -Asn- (Xaa) 49 -His- (Xaa) 8 -Tyr- (Xaa) 53 -Arg- (Xaa) 3 -Arg- (Xaa) 2 - protein containing (Xaa represents any amino acid residue, the numbers indicate the number of residues) the (Xaa) 106 -Asn- (Xaa) 54 -Trp.
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