ID   LDHB_FUNPA              Reviewed;         322 AA.
AC   P42122;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   03-AUG-2022, entry version 97.
DE   RecName: Full=L-lactate dehydrogenase B chain;
DE            Short=LDH-B;
DE            EC=1.1.1.27 {ECO:0000250|UniProtKB:P07195};
DE   Flags: Fragment;
GN   Name=ldhb;
OS   Fundulus parvipinnis (California killifish).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Actinopterygii; Neopterygii; Teleostei; Neoteleostei; Acanthomorphata;
OC   Ovalentaria; Atherinomorphae; Cyprinodontiformes; Fundulidae; Fundulus.
OX   NCBI_TaxID=28757;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=Isolate Santa Barbara 2;
RX   PubMed=8105474; DOI=10.1073/pnas.90.20.9271;
RA   Bernardi G., Sordino P., Powers D.A.;
RT   "Concordant mitochondrial and nuclear DNA phylogenies for populations of
RT   the teleost fish Fundulus heteroclitus.";
RL   Proc. Natl. Acad. Sci. U.S.A. 90:9271-9274(1993).
CC   -!- FUNCTION: Interconverts simultaneously and stereospecifically pyruvate
CC       and lactate with concomitant interconversion of NADH and NAD(+).
CC       {ECO:0000250|UniProtKB:P07195}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(S)-lactate + NAD(+) = H(+) + NADH + pyruvate;
CC         Xref=Rhea:RHEA:23444, ChEBI:CHEBI:15361, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:16651, ChEBI:CHEBI:57540, ChEBI:CHEBI:57945; EC=1.1.1.27;
CC         Evidence={ECO:0000250|UniProtKB:P07195};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:23445;
CC         Evidence={ECO:0000250|UniProtKB:P07195};
CC       PhysiologicalDirection=right-to-left; Xref=Rhea:RHEA:23446;
CC         Evidence={ECO:0000250|UniProtKB:P07195};
CC   -!- PATHWAY: Fermentation; pyruvate fermentation to lactate; (S)-lactate
CC       from pyruvate: step 1/1. {ECO:0000250|UniProtKB:P07195}.
CC   -!- SUBUNIT: Homotetramer.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the LDH/MDH superfamily. LDH family.
CC       {ECO:0000305}.
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DR   EMBL; L23780; AAA49290.1; -; Genomic_DNA.
DR   PIR; I50557; I50557.
DR   AlphaFoldDB; P42122; -.
DR   SMR; P42122; -.
DR   UniPathway; UPA00554; UER00611.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004459; F:L-lactate dehydrogenase activity; IEA:UniProtKB-EC.
DR   GO; GO:0019752; P:carboxylic acid metabolic process; IEA:InterPro.
DR   Gene3D; 3.90.110.10; -; 1.
DR   InterPro; IPR001557; L-lactate/malate_DH.
DR   InterPro; IPR011304; L-lactate_DH.
DR   InterPro; IPR018177; L-lactate_DH_AS.
DR   InterPro; IPR022383; Lactate/malate_DH_C.
DR   InterPro; IPR001236; Lactate/malate_DH_N.
DR   InterPro; IPR015955; Lactate_DH/Glyco_Ohase_4_C.
DR   InterPro; IPR036291; NAD(P)-bd_dom_sf.
DR   Pfam; PF02866; Ldh_1_C; 1.
DR   Pfam; PF00056; Ldh_1_N; 1.
DR   PIRSF; PIRSF000102; Lac_mal_DH; 1.
DR   PRINTS; PR00086; LLDHDRGNASE.
DR   SUPFAM; SSF51735; SSF51735; 1.
DR   SUPFAM; SSF56327; SSF56327; 1.
DR   TIGRFAMs; TIGR01771; L-LDH-NAD; 1.
DR   PROSITE; PS00064; L_LDH; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; NAD; Oxidoreductase.
FT   CHAIN           <1..>322
FT                   /note="L-lactate dehydrogenase B chain"
FT                   /id="PRO_0000168477"
FT   ACT_SITE        189
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU10002"
FT   BINDING         48..53
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         95
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         102
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         134
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         134
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         165
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         244
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   NON_TER         1
FT   NON_TER         322
SQ   SEQUENCE   322 AA;  34845 MW;  4AC7B8F288A04A7F CRC64;
     QKLITPLASS SAEPPRNKVT VVGVGQVGMA CTVSILLRDL CDELALVDVM EDRLKGEMMD
     LQHGLLFLKT SKVVADKDYA VTANSRLVVV TAGVRQQEGE SRLNLVQRNV NVFKCIIPQI
     IKYSPNCTIL VVSNPVDVLT YVTWKLSGLP KHRVIGSGTN LDSARFRYMM AERLGIHASS
     FSGWVLGEHG DTSVPVWSGA SVAGVNLQKL NPAIGTDGDK EQRKATHKAV VDSAYEVIKL
     KGYTNWAIGF SVADLTESIV KNLSRVHPVS TMVKDMFGIG EEVFLSLPCV LNGSGVGSVV
     YMTLTDAEVA QLKKSADTLW GI