Volume 340, Issue 1 pp. 33-40
Research Letter

Enzymatic and genetic characterization of the DasD protein possessing N-acetyl-β-d-glucosaminidase activity in Streptomyces coelicolor A3(2)

Akihiro Saito

Corresponding Author

Akihiro Saito

Department of Materials and Life Science, Faculty of Science and Technology, Shizuoka Institute of Science and Technology, Fukuroi, Shizuoka, Japan

Department of Nanobiology, Graduate School of Advanced and Integration Science, Chiba University, Matsudo, Chiba, Japan

Correspondence: Akihiro Saito, Department of Materials and Life Science, Faculty of Science and Technology, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan. Tel.: +81538 45 0188; fax: +81538 45 0110; e-mail: [email protected]Search for more papers by this author
Hiroki Ebise

Hiroki Ebise

Department of Nanobiology, Graduate School of Advanced and Integration Science, Chiba University, Matsudo, Chiba, Japan

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Yukari Orihara

Yukari Orihara

Department of Applied Biochemistry, Faculty of Horticulture, Chiba University, Matsudo, Chiba, Japan

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Satoshi Murakami

Satoshi Murakami

Department of Nanobiology, Graduate School of Advanced and Integration Science, Chiba University, Matsudo, Chiba, Japan

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Yukari Sano

Yukari Sano

Department of Nanobiology, Graduate School of Advanced and Integration Science, Chiba University, Matsudo, Chiba, Japan

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Akane Kimura

Akane Kimura

Department of Nanobiology, Graduate School of Advanced and Integration Science, Chiba University, Matsudo, Chiba, Japan

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Yuuta Sugiyama

Yuuta Sugiyama

Department of Materials and Life Science, Faculty of Science and Technology, Shizuoka Institute of Science and Technology, Fukuroi, Shizuoka, Japan

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Akikazu Ando

Akikazu Ando

Department of Nanobiology, Graduate School of Advanced and Integration Science, Chiba University, Matsudo, Chiba, Japan

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Takeshi Fujii

Takeshi Fujii

National Institute of Agro-Environmental Sciences, Tukuba, Ibaraki, Japan

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Kiyotaka Miyashita

Kiyotaka Miyashita

National Institute of Agro-Environmental Sciences, Tukuba, Ibaraki, Japan

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First published: 24 December 2012
Citations: 2

Abstract

The dasD gene is located just downstream of the dasABC gene cluster, encoding components of an ABC transporter for uptake of a chitin-degradation product N,N′-diacetylchitobiose [(GlcNAc)2] in Streptomyces coelicolor A3(2). To clarify the roles of the DasD protein in the degradation and assimilation of chitin, we obtained and characterized a recombinant DasD protein and a dasD-null mutant of S. coelicolor A3(2). The recombinant DasD protein produced in Escherichia coli showed N-acetyl-β-d-glucosaminidase (GlcNAcase) activity and its optimum temperature and pH were 40 °C and 7, respectively. dasD transcription was strongly induced in the presence of chitin, weakly by chitosan, but not by cellulose or xylan in S. coelicolor A3(2). Immuno-blot analysis demonstrated that DasD is a cytoplasmic protein. The dasD-null mutant exhibited cellular GlcNAcase activity which was comparable with that of the parent strain M145. DasD, thus, did not seem to be a major GlcNAcase. Induced extracellular chitinase activity in the dasD-null mutant was, interestingly, higher than M145, in the presence of colloidal chitin or (GlcNAc)2. In contrast to M145, (GlcNAc)2 temporally accumulated in the culture supernatant of the dasD-null mutant in the presence of colloidal chitin.

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