Advances in Protein Chemistry, 8 by M L Anson; J T Edsall

By M L Anson; J T Edsall


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Stokstad et al. (558) noted that chicken pancreas conjugase is inhibited by p-aminobenzoyltriglutamic acid, and Sims and Totter (528) observed this to be true for yeast p-amiiiobenzoylpolyglutamic acid, which also inhibits rat NATURALLY OCCURRING PEPTIDER 49 liver conjugase in vitro. The action of this polypeptide on pig kidney conjugase is not known. Mims, Swendseid, and Bird (417) have shown that deoxy- and ribonucleic acids are powerful inhibitors of pig kidney and intestinal conjugases. The inhibitory effect of these nucleic acids disappears after they have been acted upon by ribonuclease or deoxyribonucleodepolymerase.

The growth of the bacterium took place in several isolated areas, which indicated where the separated growth factors had been located on the paper. Those with the lowest Rp corresponded to the combined forms of folic acid, compounds which were still active, therefore, for the growth of Leuconostoc citrovorum (632). Hill and Scott (273, 274) and Swendseid et al. (571) showed that in animals (liver), plants (spinach leaves), and yeast, CF, is generally found in a conjugated form, inactive for the growth of Leuconostoc citrovorum.

Winsten and Eigen (632) obtained evidence for the existence of conjugated forms by utilizing a "bio-autographic " technique, which consists in separating by paper chromatography various active substances from a preparation of CF and placing this paper against the surface of an agar medium deficient only in CF. Then the medium is inoculated with Leuconostoc citrovorum. The growth of the bacterium took place in several isolated areas, which indicated where the separated growth factors had been located on the paper.

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