ID   2SS_MATST               Reviewed;          67 AA.
AC   P17718;
DT   01-AUG-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1990, sequence version 2.
DT   25-MAY-2022, entry version 60.
DE   RecName: Full=2S seed storage albumin protein {ECO:0000305};
DE   AltName: Full=Matteuccin;
DE   Contains:
DE     RecName: Full=Matteuccin light chain;
DE   Contains:
DE     RecName: Full=Matteuccin heavy chain;
DE   Flags: Fragments;
OS   Matteuccia struthiopteris (European ostrich fern) (Osmunda struthiopteris).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Polypodiopsida; Polypodiidae; Polypodiales; Aspleniineae; Onocleaceae;
OC   Matteuccia.
OX   NCBI_TaxID=3277;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   TISSUE=Spore;
RX   PubMed=2401286; DOI=10.1111/j.1432-1033.1990.tb19201.x;
RA   Roedin J., Rask L.;
RT   "Characterization of matteuccin, the 2.2S storage protein of the ostrich
RT   fern. Evolutionary relationship to angiosperm seed storage proteins.";
RL   Eur. J. Biochem. 192:101-107(1990).
CC   -!- FUNCTION: This is a 2S seed storage protein.
CC   -!- SUBUNIT: Heterodimer of a small and a large chain linked by disulfide
CC       bonds.
CC   -!- SUBCELLULAR LOCATION: Vacuole, aleurone grain.
CC   -!- SIMILARITY: Belongs to the 2S seed storage albumins family.
CC       {ECO:0000305}.
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DR   PIR; S11350; S11350.
DR   PIR; S11351; S11351.
DR   AlphaFoldDB; P17718; -.
DR   GO; GO:0033095; C:aleurone grain; IEA:UniProtKB-SubCell.
DR   GO; GO:0005773; C:vacuole; IEA:UniProtKB-KW.
DR   GO; GO:0045735; F:nutrient reservoir activity; IEA:UniProtKB-KW.
PE   1: Evidence at protein level;
KW   Cleavage on pair of basic residues; Direct protein sequencing;
KW   Disulfide bond; Seed storage protein; Storage protein; Vacuole.
FT   CHAIN           1..>25
FT                   /note="Matteuccin light chain"
FT                   /id="PRO_0000032155"
FT   CHAIN           26..>67
FT                   /note="Matteuccin heavy chain"
FT                   /id="PRO_0000032156"
FT   NON_CONS        25..26
FT                   /evidence="ECO:0000305"
FT   NON_CONS        54..55
FT                   /evidence="ECO:0000305"
FT   NON_TER         67
SQ   SEQUENCE   67 AA;  7961 MW;  141086B9B22AC55C CRC64;
     DQASMQRASR LLHQCDLRPR DCARRSSERG QGERWRQQLR ACDEDSEPRQ QCCQNLQRIS
     SQDRCRA