Abstract
The accompanying papers (Keyhani, N. O., and Roseman, S. (1996) J. Biol. Chem. 271, 33414-33424; Keyhani, N. O., and Roseman, S. (1996) J. Biol. Chem. 271, 33425-33432) describe two unique beta-N-acetylglucosaminidases from Vibrio furnissii. A third, ExoII, is reported here. The gene, exoII, was cloned into Escherichia coli, sequenced, and ExoII purified to apparent homogeneity (36 kDa). The molecular weight and N-terminal 16 amino acids of the protein conform to the predicted sequence. ExoII exhibited unique substrate specificity. It rapidly cleaved p-nitrophenyl and 4-methylumbelliferyl beta-GlcNAc, was slightly active with p-nitrophenyl-beta-GalNAc, and was inactive with all other GlcNAc derivatives tested, including N,N'-diacetylchitobiose and (GlcNAc)n, n = 3-6. Unlike GlcNAc (Ki, 210 microM), (GlcNAc)n are poor inhibitors of ExoII. The predicted protein sequence is unique among beta-N-acetylglucosaminidases excepting Cht60, recently cloned from a marine Alteromonas (Tsujibo, H., Fujimoto, K., Tanno, H., Miyamoto, K., Imada, C., Okami, Y., and Inamori, Y. (1994) Gene (Amst.) 146, 111-115). Cht60, a chitobiase, is 26.9% identical to ExoII in a 182-amino acid overlap, but the two enzymes differ in substrate specificity and o...Continue Reading
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