ID   C560_PORPU              Reviewed;         125 AA.
AC   P80478;
DT   01-OCT-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1996, sequence version 1.
DT   03-AUG-2022, entry version 92.
DE   RecName: Full=Succinate dehydrogenase cytochrome b560 subunit;
DE   AltName: Full=Succinate dehydrogenase, subunit III;
GN   Name=SDH3; Synonyms=SDHC;
OS   Porphyra purpurea (Red seaweed) (Ulva purpurea).
OG   Mitochondrion.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Bangiales; Bangiaceae; Porphyra.
OX   NCBI_TaxID=2787;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=8637872; DOI=10.1073/pnas.93.6.2328;
RA   Burger G., Lang B.F., Reith M., Gray M.W.;
RT   "Genes encoding the same three subunits of respiratory complex II are
RT   present in the mitochondrial DNA of two phylogenetically distant
RT   eukaryotes.";
RL   Proc. Natl. Acad. Sci. U.S.A. 93:2328-2332(1996).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=10488235; DOI=10.2307/3871046;
RA   Burger G., Saint-Louis D., Gray M.W., Lang B.F.;
RT   "Complete sequence of the mitochondrial DNA of the red alga Porphyra
RT   purpurea. Cyanobacterial introns and shared ancestry of red and green
RT   algae.";
RL   Plant Cell 11:1675-1694(1999).
CC   -!- FUNCTION: Membrane-anchoring subunit of succinate dehydrogenase (SDH)
CC       that is involved in complex II of the mitochondrial electron transport
CC       chain and is responsible for transferring electrons from succinate to
CC       ubiquinone (coenzyme Q). {ECO:0000250}.
CC   -!- COFACTOR:
CC       Name=heme; Xref=ChEBI:CHEBI:30413; Evidence={ECO:0000250};
CC       Note=The heme is bound between the two transmembrane subunits.
CC       {ECO:0000250};
CC   -!- PATHWAY: Carbohydrate metabolism; tricarboxylic acid cycle.
CC   -!- SUBUNIT: Forms part of complex II containing four subunits: a 70 kDa
CC       flavoprotein (FP), a 27 kDa iron-sulfur protein (IP), a cytochrome B
CC       and a membrane-anchoring protein.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane {ECO:0000250};
CC       Multi-pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the cytochrome b560 family. {ECO:0000305}.
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DR   EMBL; AF114794; AAD03124.1; -; Genomic_DNA.
DR   PIR; T11245; T11245.
DR   RefSeq; NP_049321.1; NC_002007.1.
DR   AlphaFoldDB; P80478; -.
DR   SMR; P80478; -.
DR   GeneID; 809804; -.
DR   UniPathway; UPA00223; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0005743; C:mitochondrial inner membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0045281; C:succinate dehydrogenase complex; IEA:InterPro.
DR   GO; GO:0009055; F:electron transfer activity; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0000104; F:succinate dehydrogenase activity; IEA:InterPro.
DR   GO; GO:0006099; P:tricarboxylic acid cycle; IEA:UniProtKB-UniPathway.
DR   Gene3D; 1.20.1300.10; -; 1.
DR   InterPro; IPR034804; SQR/QFR_C/D.
DR   InterPro; IPR018495; Succ_DH_cyt_bsu_CS.
DR   InterPro; IPR014314; Succ_DH_cytb556.
DR   InterPro; IPR000701; SuccDH_FuR_B_TM-su.
DR   PANTHER; PTHR10978; PTHR10978; 1.
DR   Pfam; PF01127; Sdh_cyt; 1.
DR   PIRSF; PIRSF000178; SDH_cyt_b560; 1.
DR   SUPFAM; SSF81343; SSF81343; 1.
DR   TIGRFAMs; TIGR02970; succ_dehyd_cytB; 1.
DR   PROSITE; PS01000; SDH_CYT_1; 1.
DR   PROSITE; PS01001; SDH_CYT_2; 1.
PE   3: Inferred from homology;
KW   Electron transport; Heme; Iron; Membrane; Metal-binding; Mitochondrion;
KW   Mitochondrion inner membrane; Transmembrane; Transmembrane helix;
KW   Transport; Tricarboxylic acid cycle.
FT   CHAIN           1..125
FT                   /note="Succinate dehydrogenase cytochrome b560 subunit"
FT                   /id="PRO_0000203520"
FT   TRANSMEM        29..49
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        68..88
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        104..124
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   BINDING         83
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_note="ligand shared with second transmembrane
FT                   subunit"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   125 AA;  14478 MW;  93FA32FFD8CA366F CRC64;
     MYNINRPISP HLTIYNTQKS SLFSIWHRIS GVAMFTLIAS PPLFLKLATF SYKSFNILDL
     MLNNSSLILP WFIVIISVIF LYHIINGIRH FLWDSVVNVN TESIIKDSNT LLALVFLIML
     FKFIL