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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jul 2018, 39 (4)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Purification of sucrose synthase from thermotolerant wheat grains and its characterization

 

E. Verma, B. Sharma*, H.R. Singal and R. Munjal

Department of Chemistry and Biochemistry, Department of Genetics and Plant Breeding, CCS, Haryana Agricultural University, Hisar-125 004, India

*Corresponding Author E-mail: sharmabunty097@gmail.com

 

 

 

Key words

Characterization

Purification

Sucrose synthase

Thermotolerant

Wheat grains

 

 

 

Publication Data

Paper received : 02.11.2016

Revised received : 14.07.2017

Re-revised received : 26.09.2017

Accepted : 07.11.2017

 

Abstract

Aim: Wheat is common and popular cereal with wide utilization and acceptability. High temperature stress drastically affects crop productivity and quality by disturbing sucrose metabolism. Hence, the aim of present investigation was to purify and characterize of sucrose synthase from thermotolerant wheat for various physico-chemico-kinetic properties.

 

Methodology: The immature grains of thermotolerant wheat WH-1021 were used for purification of sucrose synthase by using traditional protein purification techniques viz. (NH4)2SO4 fractionation, gel filtration through sephadex G-100 and DEAE-cellulose ion exchange chromatography. The purity was checked by native PAGE, while subunit by SDS PAGE.

 

Results: The enzyme was purified about 27 fold with approximately 37% recovery. The native enzyme had a molecular weight of 269 KDa and subunit molecular weight was found to be 63 KDa, indicating that enzyme is a homotetramer. The purified enzyme exhibited optimum activity at 37C with thermostablity upto 50C and pH 6.5. Sucrose synthase showed Km values of 14.28 and 1.18 mM for sucrose and UDP, respectively. Its activity was inhibited by Mn2+ (38.5%), while NO3- stimulated the activity by 20.8% at 2 mM concentration.     

 

Interpretation: Among the various nucleotides tested, the enzyme was highly specific for UDP as substrate and NADP+ and G-6-P were found to be the potent inhibitors. The kinetic studies revealed that sucrose synthase catalyzed the sucrose degradation by ping-pong mechanism. The results of the present study would help in planning the strategies for increased wheat productivity without compromising the quality under stress conditions.

 

 

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