home *** CD-ROM | disk | FTP | other *** search
- ***************************************************
- * Vertebrate galactoside-binding lectin signature *
- ***************************************************
-
- All vertebrates synthesize soluble galactoside-binding lectins [1,2] (also
- known as galaptins or S-lectin). These carbohydrate-binding proteins are
- developmentally regulated. Although their exact physiological role is not yet
- clear they seem to be involved in differentiation, cellular regulation and
- tissue construction. The sequence of galactoside-binding lectins from electric
- eel (electrolectin), conger eel (congerin) [3], chicken and a number of
- mammalian species is known. These lectins are proteins of about 130 to 140
- amino acid residues (14 Kd to 16 Kd).
-
- A number of other proteins are known to belong to this family:
-
- - Caenorhabditis elegans 32 Kd lactose-binding lectin [4]. This lectin is
- composed of two galaptin domains.
- - The MAC-2 antigen (also known as CBP-35 or IgE-binding protein), a 35 Kd
- lectin which binds immunoglobulin E [5] and which is composed of two
- domains: a N-terminal domain that consist of tandem repeats of a glycine/
- proline-rich sequence and a C-terminal galaptin domain.
- - Human eosinophil lysophospholipase (EC 3.1.1.5) [6] (Charcot-Leyden crystal
- protein), a protein that may have both an enzymatic and a lectin
- activities. It forms hexagonal bipyramidal crystals in tissues and
- secretions from sites of eosinophil-associated inflammation.
-
- One of the conserved regions of these lectins contains a tryptophan that has
- been shown [7] to be essential to the binding of galactosides. We have used
- this region as a signature pattern for these proteins.
-
- -Consensus pattern: W-[GEK]-x-[EQ]-x-[RE]-x(3,4)-[PCT]-[LIVMF]-[QESK]-x-G-
- x(3)-[DEK]-[LIVMFC]
- [W binds carbohydrate]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Barondes S.H., Gitt M.A., Leffler H., Cooper D.N.W.
- Biochimie 70:1627-1632(1988).
- [ 2] Hirabayashi J., Kasai K.-I.
- J. Biochem. 104:1-4(1988).
- [ 3] Muramoto K., Kamiya H.
- Biochim. Biophys. Acta 1116:129-136(1992).
- [ 4] Hirabayashi J., Satoh M., Kasai K.-I.
- J. Biol. Chem. 267:15485-15490(1992).
- [ 5] Robertson M.W., Albrandt K., Keller D., Liu F.-T.
- Biochemistry 29:8093-8100(1990).
- [ 6] Ackerman S.J., Corrette S.E., Rosenberg H.F., Bennett J.C.,
- Mastrianni D.M., Nicholson-Weller A., Weller P.F., Chin D.T., Tenen D.G.
- J. Immunol. 150:456-468(1993).
- [ 7] Abbott W.M., Feizi T.
- J. Biol. Chem. 266:5552-5557(1991).
-