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- **************************************
- * Channel forming colicins signature *
- **************************************
-
- Colicins are plasmid-encoded polypeptide toxins produced by and active
- against Escherichia coli and closely related bacteria. The channel-forming
- colicins are transmembrane proteins that depolarize the cytoplasmic membrane,
- leading to dissipation of cellular energy [1,2]. Colicins A, B, E1, Ia, Ib,
- and N belong to that group. The N-terminal part of these colicins is involved
- in their uptake; the central part is important for binding to outer membrane
- receptors and the C-terminal part is the channel-forming region.
-
- As a signature for this type of colicins, we have selected one of the most
- conserved region of the channel-forming domain.
-
- -Consensus pattern: T-x(2)-W-x-P-[LIVMFY](3)-x(2)-E
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: November 1990 / Text revised.
-
- [ 1] Pattus F., Massotte D., Wilmsen H.U., Lakey J., Tsernoglou D.,
- Tucker A., Parker M.W.
- Experientia 46:180-192(1990).
- [ 2] Cramer W.A., Cohen F.S., Merrill A.R., Song H.Y.
- Mol. Microbiol. 4:519-526(1990).
-