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The structure of lupine seed proteins

✍ Scribed by Duranti, M.

Publisher: John Wiley and Sons
Year: 1986
Tongue: English
Weight: 578 KB
Volume: 30
Category: Article
ISSN: 0027-769X
DOI: 10.1002/food.19860300303

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✦ Synopsis

The structure of lupine seed proteins .M. DURAXTI Lupine globulins (87 Po of total seed proteins) can be grouped into 3 categories: vicilin-like proteins (44",,). legumin-like proteins (33";) and other globulins (23""). The four vicilins. namely globulins 4. 5, 6 and 7. havc ;i M . W . ranging between 143 and 335 lo3 g mol-' ; they all contain covalently linked carbohydratc and consist ofseveral protoiners ofsoine M.W. in the various fractions, the heaviest of which has a 51.W. ofabout 60 . 10" g niol I. No disulphide bonds link these protomers together. Legtiinins, i.e. globulins 8 and 9a. consist of acidic and basic subunits linked by S S bonds. Also the legumins are glycoproteins. the carbohydrate moiety being covalently bound only to the acidic subunits. They havc a M . W. ranging between S2 and 36 . lo3 g rnol whereas the basic subunit has a M. W. of 19 . 10' g . 11101 I . Globulin 8 is present in two forms A and B, ofrespectively 188 and 349 . 103 g . mol-I. Globulin I ( 6 % of total globulins) is made up of disulphide bound protomers of 16 and 28 . lo3 g mol-I. Only the heavy protorner is glycoxylated.

Globulin 9b (1 2.5 yo of total globulins) has the lowest M.W. (44 . lo3 g . mol I ) and it is formed by disulphide bound protomers of I I and 13 . lo3 g mol '.

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