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  • Title: Properties of artificial proteins with random sequences.
    Author: Yomo T, Prijambada ID, Yamamoto K, Shima Y, Negoro S, Urabe I.
    Journal: Ann N Y Acad Sci; 1998 Dec 13; 864():131-5. PubMed ID: 9928087.
    Abstract:
    A library of artificial proteins of 141 amino acid residues, of which 95 are random and which include 20 kinds of amino acids, was prepared. As the properties of the artificial random proteins are free from the evolutionary constraint, they can be used as a standard to discriminate the specialized properties of natural proteins. Out of the 25 identified random proteins, 5 are soluble in the cell lysate, indicating that about 20% of the random proteins expressed in Escherichia coli are expected to be soluble. Therefore, as natural soluble or insoluble proteins can arise from the line of soluble or insoluble ancestry, respectively, solubility does not seem a specialized property of natural proteins. The soluble random proteins RP3-42 and RP3-45 were purified and their properties were investigated.
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