ID   APCE_PORPU              Reviewed;         886 AA.
AC   P51263;
DT   01-OCT-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1996, sequence version 1.
DT   03-AUG-2022, entry version 80.
DE   RecName: Full=Phycobiliprotein ApcE;
DE            EC=4.-.-.-;
DE   AltName: Full=Anchor polypeptide;
DE   AltName: Full=PBS-anchor protein;
DE   AltName: Full=Phycobilisome linker polypeptide;
GN   Name=apcE;
OS   Porphyra purpurea (Red seaweed) (Ulva purpurea).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Bangiales; Bangiaceae; Porphyra.
OX   NCBI_TaxID=2787;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Avonport;
RA   Reith M.E., Munholland J.;
RT   "Complete nucleotide sequence of the Porphyra purpurea chloroplast
RT   genome.";
RL   Plant Mol. Biol. Rep. 13:333-335(1995).
CC   -!- FUNCTION: This protein is postulated to act both as terminal energy
CC       acceptor and as a linker polypeptide that stabilizes the phycobilisome
CC       architecture. May have intrinsic bilin lyase activity (By similarity).
CC       {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000250}; Peripheral membrane protein {ECO:0000250}; Stromal side
CC       {ECO:0000250}.
CC   -!- PTM: Contains one covalently linked bilin chromophore. This protein
CC       autochromophorylates (Potential). {ECO:0000305}.
CC   -!- SIMILARITY: Belongs to the phycobilisome linker protein family.
CC       {ECO:0000255|PROSITE-ProRule:PRU00775}.
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DR   EMBL; U38804; AAC08149.1; -; Genomic_DNA.
DR   PIR; S73184; S73184.
DR   RefSeq; NP_053873.1; NC_000925.1.
DR   AlphaFoldDB; P51263; -.
DR   SMR; P51263; -.
DR   GeneID; 809892; -.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0030089; C:phycobilisome; IEA:UniProtKB-KW.
DR   GO; GO:0016829; F:lyase activity; IEA:UniProtKB-KW.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   Gene3D; 1.10.3130.20; -; 3.
DR   Gene3D; 1.10.490.20; -; 1.
DR   InterPro; IPR009050; Globin-like_sf.
DR   InterPro; IPR001297; PBS_linker_dom.
DR   InterPro; IPR038255; PBS_linker_sf.
DR   InterPro; IPR012128; Phycobilisome_asu/bsu.
DR   InterPro; IPR038719; Phycobilisome_asu/bsu_sf.
DR   Pfam; PF00427; PBS_linker_poly; 3.
DR   Pfam; PF00502; Phycobilisome; 2.
DR   SUPFAM; SSF46458; SSF46458; 1.
DR   PROSITE; PS51445; PBS_LINKER; 3.
PE   3: Inferred from homology;
KW   Antenna complex; Bile pigment; Chloroplast; Chromophore;
KW   Electron transport; Lyase; Membrane; Photosynthesis; Phycobilisome;
KW   Plastid; Repeat; Thylakoid; Transport.
FT   CHAIN           1..886
FT                   /note="Phycobiliprotein ApcE"
FT                   /id="PRO_0000199262"
FT   DOMAIN          244..424
FT                   /note="PBS-linker 1"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00775"
FT   DOMAIN          496..678
FT                   /note="PBS-linker 2"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00775"
FT   DOMAIN          695..876
FT                   /note="PBS-linker 3"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00775"
FT   BINDING         187
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   886 AA;  100161 MW;  B21074C6D58C6203 CRC64;
     MSIKASGGSP LARPQLYRTA SILTITQAEQ QDRFLQLGEL NQLVSFLNSG QKRLEVADIL
     TKNANILVAR AADKIFVGGS AISYLERPQA AVIIAGDQSS RDKINELSGN IQGDFGQSFR
     SLFNAGGATP PGFKPINVLR YGTTRMRKSL RDLDWFLRYL TYAIVSGDPN ILSVNIRGLR
     ELIDNACSSA AAIVALREMR RTALAIFEED IKGQDLVREY FNVVISEFEA PSLTDKLRKR
     ESTDLQGLRL PQTYSQAGVS TPRFVMKSSL SADEKNTVVK ACYRQIFERD IAKTYDLSLS
     NLESQVKNGQ ISIKEFIRSL GTSNIYRKQF YEPFVNSRAL ELAFRHFLGR GPSSLEEFQK
     YFAILSATGL SGLVNAILNS AEYADYFGEE TVPYFRKLGE EPQECRNWGP QIDLLNYSAP
     FRKVPQFITL FSDYKQSLPD QHPYGTGNDP LSIQFGAIFP KENKDPRKRQ AIFGKDTRRI
     LVRRGPGIYN QISNPQVRPK SAGSLGPKIF KLSNTLVATN SSANFENSVD VIAKVSYLRV
     FGREVYQEEK LLLRPIESQL QDGQISVREF IRQLAKSSIF RSLYWEPLYI CKAIEYIHNR
     LLGRPTYGRQ EINKYFDIAY KEGYYQVVDA IIDSPEYIET FGENVVPYER YTTPAGIALR
     SLRPGIIDQR FKKVISSKSS RFVELGKVKE IRSSNDIQSR IAQGVTALRD QSVIFDVNQN
     SSQEVLEQAL RAAYRQIFER DLNSFSIGGE FLDIESSFLN KQINVKELIQ KLALSELYGK
     EFYQPYPNTK VIELGTKHIL GRAPNNQAEI RFLNQILASK GLSTFVETLV NSSEYDSVYG
     TNTVPYRRFP TLPAANFPNT ETLYNRLTKQ NVSVVVPSFK KVLGNQ