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Protein

2-dehydro-3-deoxy-6-phosphogalactonate aldolase

Gene

dgoA

Organism
Escherichia coli (strain K12)
Status
Reviewed-Annotation score: -Experimental evidence at protein leveli

Functioni

Involved in the degradation of galactose via the DeLey-Doudoroff pathway. Catalyzes the reversible, stereospecific retro-aldol cleavage of 2-keto-3-deoxy-6-phosphogalactonate (KDPGal) to pyruvate and D-glyceraldehyde-3-phosphate. In the synthetic direction, it catalyzes the addition of pyruvate to electrophilic aldehydes with re-facial selectivity. It can use a limited number of aldehyde substrates, including D-glyceraldehyde-3-phosphate (natural substrate), D-glyceraldehyde, glycolaldehyde, 2-pyridinecarboxaldehyde, D-ribose, D-erythrose and D-threose. It efficiently catalyzes aldol addition only using pyruvate as the nucleophilic component and accepts both stereochemical configurations at C2 of the electrophile.2 Publications

Catalytic activityi

2-dehydro-3-deoxy-6-phospho-D-galactonate = pyruvate + D-glyceraldehyde 3-phosphate.1 Publication

Kineticsi

Kcat is 4 sec(-1) for KDPGal.
  1. KM=0.2 mM for KDPGal1 Publication

    Pathwayi: D-galactonate degradation

    This protein is involved in step 3 of the subpathway that synthesizes D-glyceraldehyde 3-phosphate and pyruvate from D-galactonate.
    Proteins known to be involved in the 3 steps of the subpathway in this organism are:
    1. D-galactonate dehydratase (dgoD)
    2. 2-dehydro-3-deoxygalactonokinase (dgoK)
    3. 2-dehydro-3-deoxy-6-phosphogalactonate aldolase (dgoA)
    This subpathway is part of the pathway D-galactonate degradation, which is itself part of Carbohydrate acid metabolism.
    View all proteins of this organism that are known to be involved in the subpathway that synthesizes D-glyceraldehyde 3-phosphate and pyruvate from D-galactonate, the pathway D-galactonate degradation and in Carbohydrate acid metabolism.

    Sites

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Binding sitei14Substrate1 Publication1
    Sitei14Orients the nucleophilic substrate1
    Active sitei37Proton donor/acceptor1 Publication1
    Binding sitei66Substrate1 Publication1
    Active sitei126Schiff-base intermediate with substrate1 Publication1
    Binding sitei126Substrate (covalent)1 Publication1
    Sitei154Plays a major role in determining the stereoselectivity1
    Binding sitei156Substrate; via amide nitrogenBy similarity1

    GO - Molecular functioni

    • 2-dehydro-3-deoxy-6-phosphogalactonate aldolase activity Source: EcoCyc

    GO - Biological processi

    • D-galactonate catabolic process Source: EcoCyc

    Keywordsi

    Molecular functionLyase

    Enzyme and pathway databases

    BioCyciEcoCyc:DEHYDDEOXPHOSGALACT-ALDOL-MONOMER
    MetaCyc:DEHYDDEOXPHOSGALACT-ALDOL-MONOMER
    UniPathwayiUPA00081; UER00520

    Names & Taxonomyi

    Protein namesi
    Recommended name:
    2-dehydro-3-deoxy-6-phosphogalactonate aldolase (EC:4.1.2.21)
    Alternative name(s):
    2-oxo-3-deoxygalactonate 6-phosphate aldolase
    6-phospho-2-dehydro-3-deoxygalactonate aldolase
    6-phospho-2-keto-3-deoxygalactonate aldolase
    Short name:
    KDPGal
    Gene namesi
    Name:dgoA
    Synonyms:yidU
    Ordered Locus Names:b4477, JW5628
    OrganismiEscherichia coli (strain K12)
    Taxonomic identifieri83333 [NCBI]
    Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEscherichia
    Proteomesi
    • UP000000318 Componenti: Chromosome
    • UP000000625 Componenti: Chromosome

    Organism-specific databases

    EcoGeneiEG11716 dgoA

    Pathology & Biotechi

    Mutagenesis

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Mutagenesisi37E → N: 50-fold decrease in catalytic efficiency and 6-fold decrease of binding affinity. 1 Publication1
    Mutagenesisi154V → T: Little stereoselectivity, accepting KDPG and KDPGal as substrate with roughly equal efficacy. Reduced the preference for KDPGal. It diminishes the activity against KDPGal and increases activity against KDPG. 1 Publication1

    PTM / Processingi

    Molecule processing

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    ChainiPRO_00000798801 – 2052-dehydro-3-deoxy-6-phosphogalactonate aldolaseAdd BLAST205

    Proteomic databases

    PaxDbiQ6BF16
    PRIDEiQ6BF16

    Expressioni

    Inductioni

    By galactonate and galactose.1 Publication

    Interactioni

    Subunit structurei

    Homotrimer.1 Publication

    Protein-protein interaction databases

    BioGridi4260839, 13 interactors
    STRINGi316385.ECDH10B_3879

    Structurei

    Secondary structure

    1205
    Legend: HelixTurnBeta strandPDB Structure known for this area
    Show more details
    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Beta strandi5 – 7Combined sources3
    Beta strandi9 – 12Combined sources4
    Helixi18 – 31Combined sources14
    Beta strandi35 – 39Combined sources5
    Helixi45 – 56Combined sources12
    Turni57 – 59Combined sources3
    Beta strandi60 – 65Combined sources6
    Helixi70 – 78Combined sources9
    Beta strandi83 – 85Combined sources3
    Helixi91 – 99Combined sources9
    Beta strandi103 – 105Combined sources3
    Beta strandi107 – 110Combined sources4
    Helixi111 – 119Combined sources9
    Beta strandi123 – 127Combined sources5
    Helixi130 – 133Combined sources4
    Helixi135 – 142Combined sources8
    Beta strandi150 – 156Combined sources7
    Turni159 – 161Combined sources3
    Helixi162 – 168Combined sources7
    Beta strandi171 – 175Combined sources5
    Turni177 – 179Combined sources3
    Helixi186 – 205Combined sources20

    3D structure databases

    Select the link destinations:
    PDBei
    RCSB PDBi
    PDBji
    Links Updated
    PDB entryMethodResolution (Å)ChainPositionsPDBsum
    2V81X-ray2.40A1-205[»]
    2V82X-ray2.10A1-205[»]
    4QCCX-ray7.08A/B1-203[»]
    ProteinModelPortaliQ6BF16
    SMRiQ6BF16
    ModBaseiSearch...
    MobiDBiSearch...

    Miscellaneous databases

    EvolutionaryTraceiQ6BF16

    Family & Domainsi

    Region

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Regioni176 – 177Substrate binding2

    Sequence similaritiesi

    Belongs to the KHG/KDPG aldolase family.Curated

    Phylogenomic databases

    eggNOGiENOG4108RTU Bacteria
    COG0800 LUCA
    HOGENOMiHOG000233112
    InParanoidiQ6BF16
    KOiK01631
    OMAiTGLKFFP
    PhylomeDBiQ6BF16

    Family and domain databases

    CDDicd00452 KDPG_aldolase, 1 hit
    Gene3Di3.20.20.70, 1 hit
    InterProiView protein in InterPro
    IPR000887 Aldlse_KDPG_KHG
    IPR013785 Aldolase_TIM
    PANTHERiPTHR30246 PTHR30246, 1 hit
    PfamiView protein in Pfam
    PF01081 Aldolase, 1 hit

    Sequencei

    Sequence statusi: Complete.

    Q6BF16-1 [UniParc]FASTAAdd to basket

    « Hide

            10         20         30         40         50
    MQWQTKLPLI AILRGITPDE ALAHVGAVID AGFDAVEIPL NSPQWEQSIP
    60 70 80 90 100
    AIVDAYGDKA LIGAGTVLKP EQVDALARMG CQLIVTPNIH SEVIRRAVGY
    110 120 130 140 150
    GMTVCPGCAT ATEAFTALEA GAQALKIFPS SAFGPQYIKA LKAVLPSDIA
    160 170 180 190 200
    VFAVGGVTPE NLAQWIDAGC AGAGLGSDLY RAGQSVERTA QQAAAFVKAY

    REAVQ
    Length:205
    Mass (Da):21,391
    Last modified:August 16, 2004 - v1
    Checksum:iFC59B92BAAA41CE4
    GO

    Sequence cautioni

    The sequence AAA62044 differs from that shown. Reason: Frameshift at positions 124, 160 and 204. The frameshift in position 204 caused the prediction of an ORF that fused dgoA and dgoD.Curated

    Mass spectrometryi

    Molecular mass is 21383 Da from positions 1 - 205. Determined by MALDI. 1 Publication

    Sequence databases

    Select the link destinations:
    EMBLi
    GenBanki
    DDBJi
    Links Updated
    L10328 Genomic DNA Translation: AAA62044.1 Frameshift.
    U00096 Genomic DNA Translation: AAT48198.1
    AP009048 Genomic DNA Translation: BAE77601.1
    PIRiE65171
    RefSeqiWP_001198722.1, NZ_LN832404.1
    YP_026238.1, NC_000913.3

    Genome annotation databases

    EnsemblBacteriaiAAT48198; AAT48198; b4477
    BAE77601; BAE77601; BAE77601
    GeneIDi2847766
    KEGGiecj:JW5628
    eco:b4477
    PATRICifig|1411691.4.peg.3010

    Similar proteinsi

    Entry informationi

    Entry nameiDGOA_ECOLI
    AccessioniPrimary (citable) accession number: Q6BF16
    Secondary accession number(s): P31458, Q2M805
    Entry historyiIntegrated into UniProtKB/Swiss-Prot: November 23, 2004
    Last sequence update: August 16, 2004
    Last modified: March 28, 2018
    This is version 100 of the entry and version 1 of the sequence. See complete history.
    Entry statusiReviewed (UniProtKB/Swiss-Prot)
    Annotation programProkaryotic Protein Annotation Program

    Miscellaneousi

    Keywords - Technical termi

    3D-structure, Complete proteome, Reference proteome
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    Main funding by: National Institutes of Health