Abstract
A mannanase-coding gene was cloned from Sphingobacterium sp. GN25 isolated from the feces of Grus nigricollis. The gene encodes a 371-residue polypeptide (ManAGN25) showing less than 74 % identity with a number of hypothetical proteins and putative glucanases and mannanases. Before experiment’s performance, ManAGN25 was predicted to be a low-temperature active mannanase based on the molecular characterization, including (1) ManAGN25 shared the highest identity of 41.1 % with the experimentally verified low-temperature active mannanase (ManAJB13) from Sphingomonas sp. JB13; (2) compared with their mesophilic and thermophilic counterparts, ManAGN25 and ManAJB13 had increased number of amino acid residues around their catalytic sites; (3) these increased number of amino acid residues built longer loops, more α-helices, and larger total accessible surface area and packing volume. Then the experiments of biochemical characterization verified that the purified recombinant ManAGN25 is a low-temperature active mannanase: the enzyme showed apparently optimal activity at 35–40 °C and retained 78.2, 44.8, and 15.0 % of its maximum activity when assayed at 30, 20, and 10 °C, respectively; the half-life of the enzyme was approximately 60 min at 37 °C; the enzyme presented a K m of 4.2 mg/ml and a k cat of 0.4/s in McIlvaine buffer (pH 7.0) at 35 °C using locust bean gum as the substrate; and the activation energy for hydrolysis of locust bean gum by the enzyme was 36.0 kJ/mol. This study is the first to report the molecular and biochemical characterizations of a mannanase from a strain.
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Abbreviations
- manAGN25 :
-
Mannanase-coding gene from Sphingobacterium sp. GN25
- ManAGN25:
-
Mannanase from Sphingobacterium sp. GN25
- rManAGN25:
-
Recombinant ManAGN25
- ManAJB13:
-
The low-temperature active mannanase from Sphingomonas sp. JB13
- ManA:
-
Thermophilic mannanase from Dictyoglomus thermophilum Rt46B.1
- Man26BCD:
-
Mesophilic mannanase from Paenibacillus sp. BME-14
- PMAN:
-
Low-temperature active mannanase from Glaciozyma antarctica PI12
- G. nigricollis :
-
Grus nigricollis
- E. coli :
-
Escherichia coli
- S. thalpophilum :
-
Sphingobacterium thalpophilum
- GH:
-
Glycosyl hydrolase family
- IUCN:
-
International Union for Conservation of Nature
- PCR:
-
Degenerate polymerase chain reaction
- TAIL-PCR:
-
Thermal asymmetric interlaced PCR
- IPTG:
-
Isopropyl-β-d-1-thiogalactopyranoside
- SP primers:
-
Nested insertion-specific primers
- ASA:
-
Accessible surface area
- TPV:
-
Total packing volume
- pET-manAGN25 :
-
Recombinant plasmid of pET-28a(+) vector and coding sequence of the mature protein of manAGN25
- LB:
-
Luria–Bertani
- Buffer A:
-
20 mmol/l Tris–HCl 0.5 mol/l NaCl, pH 7.2
- SDS-PAGE:
-
Sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- MALDI-TOF MS:
-
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry
- DNS:
-
3,5-Dinitrosalicylic acid
- U:
-
Unit
- McIlvaine buffer:
-
A mixture of 0.1 mol/l citric acid and 0.2 mol/l Na2HPO4
- P1–P4:
- T m :
-
Annealing temperature
- NR:
-
Not reported
- Ea:
-
Activation energy
- ΔG * :
-
Free energy of activation
- ΔH * :
-
Enthalpy of activation
- ΔS * :
-
Entropy of activation
- Q10 :
-
Temperature coefficient
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Acknowledgments
This work was supported by the Key Technologies Research and Development Program of China (2013BAD10B01), the National Natural Science Foundation of China (31460694), and the Applied and Basic Research Foundation of Yunnan Province (2011FB048 and 2013FZ045).
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Rui Zhang and Junpei Zhou contributed equally to this work.
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Zhang, R., Zhou, J., Gao, Y. et al. Molecular and biochemical characterizations of a new low-temperature active mannanase. Folia Microbiol 60, 483–492 (2015). https://doi.org/10.1007/s12223-015-0391-1
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DOI: https://doi.org/10.1007/s12223-015-0391-1