Heterogenous Degradation of Myofibrillar Proteins |
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Authors: | Nagasawa Takashi Motoni Kadowaki Tadashi Noguchi Hiroshi Naito |
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Institution: | Department of Agricultural Chemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan |
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Abstract: | Pectic substances were extracted from the vegetables with oxalate buffer of pH 4.25 and, after saponification, fractionated into two components, weakly acidic pectic polysaccharide (WAP) and pectic acid, by DEAE-cellulose and Sephadex G-100 chromatographies. The galacturonic acid content (17.3~25.8%) of WAPs was much lower than that of pectic acids, though the neutral sugar compositions of both pectic substances were almost the same. The arabinose-galactose side chains were found to be very long or highly branched in WAPs compared with those in pectic acids.All the WAPs were appreciably hydrolyzed by exo- and endopolygalacturonases. The limited-degradation products (the residual polysaccharides; i.e., the rhamnogalacturonan segments) obtained by endopolygalacturonase from both WAPs and pectic acids showed a similar behavior on Sephadex G-100 and Sepharose CL-4B gel filtrations; each of the rhamnogalacturonan segments was eluted in the void volume of the Sephadex G-100 column. From these results, we concluded that WAPs are probably an inherent pectic component of the cell walls of the vegetables. |
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Keywords: | royal jelly T-antigen tumor marker insect N-glycan Apis mellifera |
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