Cloning and biochemical characterization of an endo-1,4-β-mannanase from the coffee berry borer hypothenemus hampei

BMC Research Notes

Ricardo Acuña-Zornosa²  Pablo Gutiérrez-Sanchez¹  Juan J Vásquez-Ospina²  Carolina Aguilera-Gálvez² 

[1] Laboratorio de Microbiología Industrial, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Medellín, Colombia;Disciplina de Mejoramiento Genético, Centro Nacional de Investigaciones de Café (CENICAFE), Planalto, Km 4 vía antigua, Chinchiná-Manizales, Colombia

关键词: Glycosyl hydrolase;    Hypotenemus hampei;    Coffee berry borer;    Endo-mannanase;   

Others  :  1141847
DOI  :  10.1186/1756-0500-6-333

 received in 2013-05-23, accepted in 2013-08-19,  发布年份 2013

【 摘 要 】

Background

The study of coffee polysaccharides-degrading enzymes from the coffee berry borer Hypothenemus hampei, has become an important alternative in the identification for enzymatic inhibitors that can be used as an alternative control of this dangerous insect. We report the cloning, expression and biochemical characterization of a mannanase gene that was identified in the midgut of the coffee berry borer and is responsible for the degradation of the most abundant polysaccharide in the coffee bean.

Methods

The amino acid sequence of HhMan was analyzed by multiple sequence alignment comparisons with BLAST (Basic Local Alignment Search Tool) and CLUSTALW. A Pichia pastoris expression system was used to express the recombinant form of the enzyme. The mannanase activity was quantified by the 3,5-dinitrosalicylic (DNS) and the hydrolitic properties were detected by TLC.

Results

An endo-1,4-β-mannanase from the digestive tract of the insect Hypothenemus hampei was cloned and expressed as a recombinant protein in the Pichia pastoris system. This enzyme is 56% identical to the sequence of an endo-β-mannanase from Bacillus circulans that belongs to the glycosyl hydrolase 5 (GH5) family. The purified recombinant protein (rHhMan) exhibited a single band (35.5 kDa) by SDS-PAGE, and its activity was confirmed by zymography. rHhMan displays optimal activity levels at pH 5.5 and 30°C and can hydrolyze galactomannans of varying mannose:galactose ratios, suggesting that the enzymatic activity is independent of the presence of side chains such as galactose residues. The enzyme cannot hydrolyze manno-oligosaccharides such as mannobiose and mannotriose; however, it can degrade mannotetraose, likely through a transglycosylation reaction. The K_m and k_cat values of this enzyme on guar gum were 2.074 mg ml^-1 and 50.87 s^-1, respectively, which is similar to other mannanases.

Conclusion

This work is the first study of an endo-1,4-β-mannanase from an insect using this expression system. Due to this enzyme’s importance in the digestive processes of the coffee berry borer, this study may enable the design of inhibitors against endo-1,4-β-mannanase to decrease the economic losses stemming from this insect.

【 授权许可】

   
2013 Aguilera-Gálvez et al.; licensee BioMed Central Ltd.

【 图 表 】

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