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- ***************************************
- * Potato inhibitor I family signature *
- ***************************************
-
- The potato inhibitor I family is one of the numerous families of serine
- proteinase inhibitors. Members of this protein family are found in plants;
- in the seeds of barley or beans [1,2,3], and in potato or tomato leaves where
- they accumulate in response to mechanical damage [4,5]. An inhibitor belonging
- to this family is also found in leech [6]. It is interesting to note that,
- currently, this is the only proteinase inhibitor family to be found both in
- plant and animal kingdoms.
-
- Structurally these inhibitors are small (60 to 90 residues) and in contrast
- with other families of protease inhibitors, they lack disulfide bonds. They
- have a single inhibitory site. The consensus pattern we developed includes
- three out of the four residues conserved in all members of this family and is
- located in the N-terminal half.
-
- -Consensus pattern: [FYW]-P-[EQH]-[LIV](2)-G-x(2)-[STAGV]-x(2)-A
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for barley subtilisin-chymotrypsin inhibitor-2b which has Glu instead of Gly,
- and a trypsin inhibitor from the cucurbitaceae Momordica charantia [7], which
- is said to belong to the potato inhibitor I family but which shows only a
- very weak similarity with the other members of this family.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Text revised.
-
- [ 1] Svendsen I., Hejgaard J., Chavan J.K.
- Carlsberg Res. Commun. 49:493-502(1984).
- [ 2] Svendsen I., Boisen S., Hejgaard J.
- Carlsberg Res. Commun. 47:45-53(1982).
- [ 3] Nozawa H., Yamagata H., Aizono Y., Yoshikawa M., Iwasaki T.
- J. Biochem. 106:1003-1008(1989).
- [ 4] Cleveland T.E., Thornburg R.W., Ryan C.A.
- Plant Mol. Biol. 8:199-207(1987).
- [ 5] Lee J.S., Brown W.E., Graham J.S., Pearce G., Fox E.A., Dreher T.W.,
- Ahern K.G., Pearson G.D., Ryan C.A.
- Proc. Natl. Acad. Sci. U.S.A. 83:7277-7281(1986).
- [ 6] Seemuller U., Eulitz M., Fritz H., Strobl A.
- Hoppe-Seyler's Z. Physiol. Chem. 361:1841-1846(1980).
- [ 7] Zeng F.-Y., Qian R.-Q., Wang Y.
- FEBS Lett. 234:35-38(1988).
-