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- W2082072009 abstract "The distribution of cytidine-5′-monophosphosialic acid synthetase, the enzyme that catalyzes the synthesis of “active” sialic acid, was investigated in several tissues of the adult hog eye. Of the ocular tissues examined (retina, choroid, iris, ciliary body, lens and cornea) highest enzymatic activity was observed in extracts from the retina. Similar activities were observed in tissue from the fetal hog eye. Cytidine-5′-monophosphosialic acid prepared enzymatically by extracts from the retina was isolated and identified. In the lens, most of the enzymatic activity was located in the capsule-epithelial region. No activity was detected in extracts prepared from human cataractous lenses. Dialysis studies indicated that all of the sialic acid in cataractous lenses is non-dialyzable, i.e. it exists in bound form. Studies on the subcellular distribution of enzymatic activity in the retina showed that the “nuclear fraction” prepared from 0·25 m sucrose homogenates of the tissue contained most of the activity. High activity was also observed in more purified nuclei prepared by sucrose-CaCl 2 procedures. Some implications of the nuclear location of sialic acid activation are discussed." @default.
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- W2082072009 date "1969-01-01" @default.
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- W2082072009 title "Sialic acid activating enzyme in ocular tissue" @default.
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- W2082072009 doi "https://doi.org/10.1016/s0014-4835(69)80079-5" @default.
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