Biologia plantarum 44:283-288, 2001 | DOI: 10.1023/A:1010263728721
Endopeptidases of Triticale Seeds
- 1 Department of Biochemistry, Warsaw Agricultural University, Warszawa, Poland
The changes in endopeptidase activity in different parts of germinating triticale cv. Malno were investigated. Haemoglobin, gliadin, azocasein and azoalbumin were used as substrates. During the first day of germination the activity of haemoglobin hydrolyzing endopeptidases predominated while after the second day, mainly in the endosperm, a rapid increase in endopeptidases activity preferring gliadin hydrolysis was observed. In all the investigated tissues azocaseinolytic activities increased with the successive days of germination. Similar changes were observed using azoalbumin with one exception: in the embryo axis this activity decreased with the progression of germination. Separation of endopeptidases on the DEAE Sepharose CL-6B reveals three activity peaks in extract from dry seeds and four peaks in extract from 3 d germinated seeds. The obtained peaks differed in substrate specificity and in sensitivities to class-specific inhibitors.
Keywords: aspartyl; cysteine; hydrolytic specificity; serine endopeptidases; Triticosecale
Subjects: endopeptidases, triticale; seed endopeptidases, triticale; triticale, Triticosecale
Published: June 1, 2001 Show citation
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