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- W1539201908 abstract "Abstract Protocollagen proline hydroxylase was purified from chick embryos, and it was examined by electron microscopy with negative staining techniques. Enzyme prepared in Helsinki consisted almost entirely of single ring structures. Enzyme prepared in Philadelphia under essentially the same conditions consisted almost entirely of tubular forms in which four rings were stacked together. Repeated freezing and thawing of the Helsinki preparation markedly increased the number of four-ring structures, but it was not possible to establish reproducible conditions for the interconversion of these two major forms of the enzyme. Each ring in the four-ring structure had a diameter of 100 A, a height of 30 to 35 A, and a central hole of about 20 A. The single ring structure was slightly more distended. The molecular weight of each ring was about 200,000, and therefore the molecular weight of the four-ring structure was about 800,000. The inner two rings of the four-ring structure were closer together than the outer two rings. Since the four rings appeared to be identical, the observations suggested that the rings were held together by a combination of heterologous and isologous bonds. No regular structures with more than four rings were seen, and the simplest bonding sequence consistent with these observations was (AB)—(AB)— (BA)—(BA) in which larger structures were not favored, because the formation of the inner B—B bond altered the A surfaces on the inner rings so that they were not equivalent to the A surfaces on the outer rings." @default.
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- W1539201908 date "1970-05-01" @default.
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- W1539201908 title "Electron Microscopy of Protocollagen Proline Hydroxylase from Chick Embryos" @default.
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- W1539201908 doi "https://doi.org/10.1016/s0021-9258(18)63119-9" @default.
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