Wheat superoxide dismutase isoenzymes

D. S. Robinson; J. K. Donnelly; S. M. Lawlor; P. J. Frazier; N. W R Daniels

doi:10.1006/jcrs.1996.0009

Wheat superoxide dismutase isoenzymes

D. S. Robinson, J. K. Donnelly, S. M. Lawlor, P. J. Frazier, N. W R Daniels

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Evidence was obtained indicating that the superoxide dismutase (SOD) A and B isoenzymes of the wheat cultivar Tonic are of the Cu/ Zn type, whereas the SOD-C group are similar to manganese containing dismutases. Heat inactivation plots showed that the enzymic activity in crude extracts was relatively stable up to 50°C. The thermodynamic parameters enthalpy, ΔH#, free energy, ΔG#, and entropy, ΔS#, were estimated for the thermal inactivation of extracted SOD activity and a purified SOD-C isoenzyme. The SOD-C isoenzyme was purified extensively and shown to contain two closely related tetrametic isozymes (pI6·0 and 66·1) of M_r 80 000. A M_r of 20 000 has been calculated for the subunits. The N-terminal amino acid sequence of the purified SOD-C could be aligned with that of the Mn-SOD enzyme of maize and showed 57% homology.

Original language	English
Pages (from-to)	93-101
Number of pages	9
Journal	Journal of Cereal Science
Volume	23
Issue number	1
DOIs	https://doi.org/10.1006/jcrs.1996.0009
Publication status	Published - Jan 1996

Keywords

Cereals
Heat inactivation
Superoxide dismutase
Wheat

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10.1006/jcrs.1996.0009

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title = "Wheat superoxide dismutase isoenzymes",

abstract = "Evidence was obtained indicating that the superoxide dismutase (SOD) A and B isoenzymes of the wheat cultivar Tonic are of the Cu/ Zn type, whereas the SOD-C group are similar to manganese containing dismutases. Heat inactivation plots showed that the enzymic activity in crude extracts was relatively stable up to 50°C. The thermodynamic parameters enthalpy, ΔH#, free energy, ΔG#, and entropy, ΔS#, were estimated for the thermal inactivation of extracted SOD activity and a purified SOD-C isoenzyme. The SOD-C isoenzyme was purified extensively and shown to contain two closely related tetrametic isozymes (pI6·0 and 66·1) of Mr 80 000. A Mr of 20 000 has been calculated for the subunits. The N-terminal amino acid sequence of the purified SOD-C could be aligned with that of the Mn-SOD enzyme of maize and showed 57% homology.",

keywords = "Cereals, Heat inactivation, Superoxide dismutase, Wheat",

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T1 - Wheat superoxide dismutase isoenzymes

AU - Robinson, D. S.

AU - Donnelly, J. K.

AU - Lawlor, S. M.

AU - Frazier, P. J.

AU - Daniels, N. W R

PY - 1996/1

Y1 - 1996/1

N2 - Evidence was obtained indicating that the superoxide dismutase (SOD) A and B isoenzymes of the wheat cultivar Tonic are of the Cu/ Zn type, whereas the SOD-C group are similar to manganese containing dismutases. Heat inactivation plots showed that the enzymic activity in crude extracts was relatively stable up to 50°C. The thermodynamic parameters enthalpy, ΔH#, free energy, ΔG#, and entropy, ΔS#, were estimated for the thermal inactivation of extracted SOD activity and a purified SOD-C isoenzyme. The SOD-C isoenzyme was purified extensively and shown to contain two closely related tetrametic isozymes (pI6·0 and 66·1) of Mr 80 000. A Mr of 20 000 has been calculated for the subunits. The N-terminal amino acid sequence of the purified SOD-C could be aligned with that of the Mn-SOD enzyme of maize and showed 57% homology.

AB - Evidence was obtained indicating that the superoxide dismutase (SOD) A and B isoenzymes of the wheat cultivar Tonic are of the Cu/ Zn type, whereas the SOD-C group are similar to manganese containing dismutases. Heat inactivation plots showed that the enzymic activity in crude extracts was relatively stable up to 50°C. The thermodynamic parameters enthalpy, ΔH#, free energy, ΔG#, and entropy, ΔS#, were estimated for the thermal inactivation of extracted SOD activity and a purified SOD-C isoenzyme. The SOD-C isoenzyme was purified extensively and shown to contain two closely related tetrametic isozymes (pI6·0 and 66·1) of Mr 80 000. A Mr of 20 000 has been calculated for the subunits. The N-terminal amino acid sequence of the purified SOD-C could be aligned with that of the Mn-SOD enzyme of maize and showed 57% homology.

KW - Cereals

KW - Heat inactivation

KW - Superoxide dismutase

KW - Wheat

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Wheat superoxide dismutase isoenzymes

Abstract

Keywords

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