ECB-ART-30535
Biochim Biophys Acta
1978 Sep 28;5303:402-11. doi: 10.1016/0005-2760(78)90160-1.
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Animal carotenoids 15. Carotenoid distribution and carotenoprotein of Asterias rubens.
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A clear differentiation in localization according to functional groups in the carotenoids of the starfish, Asterias rubens, is reported. Only the free alpha-ketols, 7,8,7'',8''-tetradehydroastaxanthin, 7,8-didehydroastaxanthin and astaxanthin, are present in the purified carotenoprotein. A post mortem liberated slime contained beta,beta-carotene, free and esterified alloxanthin and esterified alpha-ketols. Evidence suggesting the existence of an alloxanthin protein complex was obtained. The carotenoprotein, asteriarubin, accounts for approx. 10% of the protein extracted by low salt dialysis from the purple-blue part of the top skin of A. rubens and exhibits an absorbance maximum at 554 nm in buffer solution. Asteriarubin is a glycoprotein with an equivalent Stoke''s radius corresponding to that of globular proteins of molecular weight 8--10 10(4) and contains 20 microgram carotenoid per mg asteriarubin. Sodium dodecyl sulfate polyacrylamide gel electrophoresis of purified asteriarubin disclosed two major components, one of which is a glycopeptide.
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