Production of β-Mannanase and β-Mannosidase from Aspergillus awamori K4 and Their Properties

Kurakake, Masahiro; Komaki, Toshiaki

doi:10.1007/s002840010233

Cited by 64 publications

(38 citation statements)

References 5 publications

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“…-1,4-Mannanase has been isolated from bacteria (Araki, 1983 ;Akino et al, 1988;Talbot et al, 1990;Braithwaite et al, 1995;Nakajima and Matsuura, 1997;Li et al, 2000;Politz et al, 2000;Kansoh and Nagieb, 2004;Li et al, 2006), fungi (Johnson, 1990;Stalbrand et al, 1993;Kurakake et al, 2001;Puchart et al, 2004;Naganagouda et al, 2009), higher plants (Shimahara et al, 1975;Marraccini et al, 2001), and mollusks (Yamaura and Matsumoto, 1993;Yamaura et al, 1996;Xu et al, 2002a andOotsuka et al, 2006). Compared with bacterial and fungal enzymes, molluscan enzymes have not been well investigated, i.e., only four -1,4-mannanases have been investigated in Pomacea insularus (Yamaura and Matsumoto, 1993), Littorina brevicula (Yamaura et al, 1996), Mytilus edulis (Xu et al, 2002a and b), and Haliotis discus hannai (Ootsuka et.…”

Section: Introductionmentioning

confidence: 99%

An endo-β-1,4-mannanase, AkMan, from the common sea hare Aplysia kurodai

Zahura¹,

Rahman²,

Inoue³

et al. 2010

Comparative Biochemistry and Physiology Part B: Biochemistry an

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Section: Introductionmentioning

confidence: 99%

An endo-β-1,4-mannanase, AkMan, from the common sea hare Aplysia kurodai

Zahura¹,

Rahman²,

Inoue³

et al. 2010

Comparative Biochemistry and Physiology Part B: Biochemistry an

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“…Temperature and pH optima of ManB were determined according to the method of Kurakake and Komaki (29).…”

Section: Vol 69 2003 Cloning Of a ␤-Mannosidase-encoding Gene From mentioning

confidence: 99%

Cloning and Heterologous Expression of a β- d -Mannosidase (EC 3.2.1.25)-Encoding Gene from Thermobifida fusca TM51

Béki

Nagy

Vanderleyden

et al. 2003

Appl Environ Microbiol

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Thermobifida fusca TM51, a thermophilic actinomycete isolated from composted horse manure, was found to produce a number of lignocellulose-degrading hydrolases, including endoglucanases, exoglucanases, endoxylanases, ␤-xylosidases, endomannanases, and ␤-mannosidases, when grown on cellulose or hemicellulose as carbon sources. ␤-Mannosidases (EC 3.2.1.25), although contributing to the hydrolysis of hemicellulose fractions, such as galacto-mannans, constitute a lesser-known group of the lytic enzyme systems due to their low representation in the proteins secreted by hemicellulolytic microorganisms. An expression library of T. fusca, prepared in Streptomyces lividans TK24, was screened for ␤-mannosidase activity to clone genes coding for mannosidases. One positive clone was identified, and a ␤-mannosidase-encoding gene (manB) was isolated. Sequence analysis of the deduced amino acid sequence of the putative ManB protein revealed substantial similarity to known mannosidases in family 2 of the glycosyl hydrolase enzymes. The calculated molecular mass of the predicted protein was 94 kDa, with an estimated pI of 4.87. S. lividans was used as heterologous expression host for the putative ␤-mannosidase gene of T. fusca. The purified gene product obtained from the culture filtrate of S. lividans was then subjected to more-detailed biochemical analysis. Temperature and pH optima of the recombinant enzyme were 53°C and 7.17, respectively. Substrate specificity tests revealed that the enzyme exerts only ␤-D-mannosidase activity. Its kinetic parameters, determined on para-nitrophenyl ␤-Dmannopyranoside (pNP-␤M) substrate were as follows: K m ‫؍‬ 180 M and V max ‫؍‬ 5.96 mol min ؊1 mg ؊1 ; the inhibition constant for mannose was K i ‫؍‬ 5.5 mM. Glucono-lacton had no effect on the enzyme activity. A moderate trans-glycosidase activity was also observed when the enzyme was incubated in the presence of pNP-␣M and pNP-␤M; under these conditions mannosyl groups were transferred by the enzyme from pNP-␤M to pNP-␣M resulting in the synthesis of small amounts (1 to 2%) of disaccharides.Thermobifida spp. are gram-positive, compost-and soil-inhabiting bacteria with broad degradative activity on plant cell wall constituents. Thermobifida fusca, the most extensively studied species of this genus, is the model organism of thermophilic, aerobic cellulolytic bacteria (48). While there are ample data on the cellulolytic system of T. fusca (8,24,30,47,48), the hemicellulolytic enzyme system of this species is still poorly characterized. Only one endoxylanase-and an endomannanase-encoding gene have been cloned to date (20,22), although the hemicellulolytic enzyme system of T. fusca may be as complex as the well-characterized cellulase system of this organism; the latter consists of three endoglucanases, two exoglucanases, one processive endoglucanase, and a cellobiase enzyme (23,43).The complexity of cell wall-degrading enzyme systems is a consequence of the complex nature of plant cell wall. Hemicelluloses act as linkers between lignin and cel...

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“…b-Mannosidases have been reported from both bacteria [1,2] and fungi [3][4][5][6]. They are also present in plants and animals, including mammals [7][8][9] and are mainly classified into glycoside hydrolase family 2 (GH2), a diverse family with several exo-glycosidase specificities.…”

Section: Introductionmentioning

confidence: 99%

“…BtMan2A is also hitherto the only high-resolution GH2 b-mannosidase crystal structure, showing an active site pocket with a À1 subsite essential for recognition of terminal mannosyl residue [12]. A few extracellular fungal GH2 b-mannosidases have been reported [3,5,6]. In addition, human and bovine lysosomal bmannosidases also belong to GH2 [9,13].…”

Section: Introductionmentioning

confidence: 99%