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PROSITE documentation PDOC00284
11-S plant seed storage proteins signature


Description

Plant seed storage proteins, whose principal function appears to be the major nitrogen source for the developing plant, can be classified, on the basis of their structure, into different families. 11-S are non-glycosylated proteins which form hexameric structures [1,2]. Each of the subunits in the hexamer is itself composed of an acidic and a basic chain derived from a single precursor and linked by a disulfide bond. This structure is shown in the following representation. 

                   +-------------------------+
                   |                         |
        xxxxxxxxxxxCxxxxxxxxxxxxxxxxxxxxxxNGxCxxxxxxxxxxxxxxxxxxxxxxx
                                          *********
        <------Acidic-subunit-------------><-----Basic-subunit------>
        <-----------------About-480-to-500-residues----------------->

'C': conserved cysteine involved in a disulfide bond.
'*': position of the pattern.

Proteins that belong to the 11-S family are: pea and broad bean legumins, rape cruciferin, rice glutelins, cotton β-globulins, soybean glycinins, pumpkin 11-S globulin, oat globulin, sunflower helianthinin G3, etc.

As a signature pattern for this family of proteins we used the region that includes the conserved cleavage site between the acidic and basic subunits (Asn-Gly) and a proximal cysteine residue which is involved in the interchain disulfide bond.

Last update:

June 1994 / Pattern and text revised.

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Technical section

PROSITE method (with tools and information) covered by this documentation:

11S_SEED_STORAGE, PS00305; 11-S plant seed storage proteins signature  (PATTERN)


References

1AuthorsHayashi M. Mori H. Nishimura M. Akazawa T. Hara-Nishimura I.
TitleNucleotide sequence of cloned cDNA coding for pumpkin 11-S globulin beta subunit.
SourceEur. J. Biochem. 172:627-632(1988).
PubMed ID2450746

2AuthorsShotwell M.A. Afonso C. Davies E. Chesnut R.S. Larkins B.A.
SourcePlant Physiol. 87:698-704(1988).



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