Chemistry and Functions of Colicins by Lowell P. Hager

By Lowell P. Hager

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46, 2019 (1972). W. Wickner, D. Brutlag, R. Schekman and A. Kornberg, Proc. Nat, Acad. Sei. A. 69, 965 (1972). G. B l a i r , D . J . B. R. H e l i n s k i , P r o c . N a t . A c a d . S e i . U . S . A . 6 9 , 2518 (1972). 39 CHEMISTRY OF COLICINS Jordan Konisky In recent years comparative studies of physio­ logically related proteins have contributed to an understanding of both evolutionary processes and structure-function relations (for a review, see 1 ) . In this regard, comparative studies of the related bactericidal proteins, colicins, may lead to know­ ledge that is useful not only to workers interested in colicins, but to molecular biologists interested in general aspects of protein structure.

Acad. Sei. A. 53, 1104 (1965). W. R. Helinski, Proc. Nat. Acad. Sei. A. 61, 1406 (1968). B. R. Helinski, J. Bacteriol. 110, 1135 (1972). R. B. Clewell, Ann. Rev. 38 CHEMISTRY AND FUNCTIONS OF COLICINS Biochem. 40, 899 (1971). W. Gilbert and D. Dressier, Cold Spring Harbor Symp. Quant. Biol. £3, 473 (1968). J. Inselburg and M. Fuke, Proc. Nat. Acad. Sei. A. £8, 2839 (1971). B. R. Helinski, Biochem. Biophys. Res. Commun. 40, 608 (1970). B. R. Helinski, Biochemistry 9, 4428 (1970). G. B. J. R. Helinski, Proc.

However, as previously shown (14), colicins E 2 and E 3 share common antigenic specificities as do colicins la and lb (23). Colicin K does not react with any of the sera described in Figure 7 (data not shown). It has been reported that colicin D is antigenically distinct from colicin E 3 (22). Table VI summarizes the physical properties of the colicins under consideration. The colicins ex­ hibit a range of molecular weights (45-89,000). In­ terestingly enough, those colicins which inhibit all macromolecular synthesis have characteristically high f/f0 values.

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