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Protein

L-Rhamnulokinase

Gene

rhaB

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

Functioni

Involved in the catabolism of L-rhamnose (6-deoxy-L-mannose). It could also play a role in the metabolism of some rare sugars such as L-fructose. Catalyzes the transfer of the gamma-phosphate group from ATP to the 1-hydroxyl group of L-rhamnulose to yield L-rhamnulose 1-phosphate. Uridine triphosphate (UTP), cytidine 5-triphosphate (CTP), guanosine 5-triphosphate (GTP), and thymidine triphosphate (TTP) also can act as phosphoryl donors. It can also phosphorylate L-fuculose and L-xylulose.UniRule annotation3 Publications

Catalytic activityi

ATP + L-rhamnulose = ADP + L-rhamnulose 1-phosphate.UniRule annotation2 Publications

Cofactori

Mg2+UniRule annotation1 PublicationNote: It can also use manganese, cobalt, iron, calcium and copper ions.1 Publication

Kineticsi

  1. KM=82 µM for L-rhamnulose (at pH 8.5 and 37 degrees Celsius)1 Publication
  2. KM=110 µM for ATP (at pH 8.5 and 37 degrees Celsius)1 Publication
  3. KM=270 µM for magnesium ion (at pH 8.5 and 37 degrees Celsius)1 Publication
  4. KM=3 mM for beta-L-fructose (at pH 8)1 Publication

    pH dependencei

    Optimum pH is 8.5.1 Publication

    Pathwayi: L-rhamnose degradation

    This protein is involved in step 2 of the subpathway that synthesizes glycerone phosphate from L-rhamnose.UniRule annotation
    Proteins known to be involved in the 3 steps of the subpathway in this organism are:
    1. L-rhamnose isomerase (rhaA)
    2. L-Rhamnulokinase (rhaB)
    3. Rhamnulose-1-phosphate aldolase (rhaD)
    This subpathway is part of the pathway L-rhamnose degradation, which is itself part of Carbohydrate degradation.
    View all proteins of this organism that are known to be involved in the subpathway that synthesizes glycerone phosphate from L-rhamnose, the pathway L-rhamnose degradation and in Carbohydrate degradation.

    Sites

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Binding sitei83Substrate; via amide nitrogen and carbonyl oxygenUniRule annotation1 Publication1
    Active sitei237Proton acceptorUniRule annotation1 Publication1
    Binding sitei259ATPUniRule annotation1 Publication1
    Binding sitei296SubstrateUniRule annotation1 Publication1
    Binding sitei304ATPUniRule annotation1 Publication1
    Binding sitei402ATP; via amide nitrogenUniRule annotation1 Publication1

    Regions

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Nucleotide bindingi13 – 17ATPUniRule annotation1 Publication5

    GO - Molecular functioni

    • ATP binding Source: UniProtKB
    • rhamnulokinase activity Source: UniProtKB

    GO - Biological processi

    • rhamnose catabolic process Source: UniProtKB

    Keywordsi

    Molecular functionKinase, Transferase
    Biological processRhamnose metabolism
    LigandATP-binding, Magnesium, Nucleotide-binding

    Enzyme and pathway databases

    BioCyciEcoCyc:RHAMNULOKIN-MONOMER
    MetaCyc:RHAMNULOKIN-MONOMER
    BRENDAi2.7.1.5 2026
    UniPathwayiUPA00541; UER00602

    Names & Taxonomyi

    Protein namesi
    Recommended name:
    L-Rhamnulokinase1 PublicationUniRule annotation (EC:2.7.1.5UniRule annotation2 Publications)
    Short name:
    RhaB1 PublicationUniRule annotation
    Short name:
    RhuK1 Publication
    Alternative name(s):
    ATP:L-rhamnulose phosphotransferase1 PublicationUniRule annotation
    L-rhamnulose 1-kinase1 PublicationUniRule annotation
    Rhamnulose kinase1 PublicationUniRule annotation
    Gene namesi
    Name:rhaB1 PublicationUniRule annotation
    Ordered Locus Names:b3904, JW3875
    OrganismiEscherichia coli (strain K12)
    Taxonomic identifieri83333 [NCBI]
    Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEscherichia
    Proteomesi
    • UP000000318 Componenti: Chromosome
    • UP000000625 Componenti: Chromosome

    Organism-specific databases

    EcoGeneiEG11868 rhaB

    Pathology & Biotechi

    Disruption phenotypei

    Cells lacking this gene are unable to utilize rhamnose as a source of carbon.1 Publication

    Mutagenesis

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Mutagenesisi69E → A: Same kinase activity as the wild-type; when associated with A-70 and A-73. 1 Publication1
    Mutagenesisi70E → A: Same kinase activity as the wild-type; when associated with A-69 and A-73. 1 Publication1
    Mutagenesisi73R → A: Same kinase activity as the wild-type; when associated with A-69 and A-70. 1 Publication1

    PTM / Processingi

    Molecule processing

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    ChainiPRO_00000905311 – 489L-RhamnulokinaseAdd BLAST489

    Amino acid modifications

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Disulfide bondi68 ↔ 222UniRule annotation1 Publication
    Disulfide bondi353 ↔ 370UniRule annotation1 Publication
    Disulfide bondi413 ↔ 417UniRule annotation

    Keywords - PTMi

    Disulfide bond

    Proteomic databases

    PaxDbiP32171
    PRIDEiP32171

    Expressioni

    Inductioni

    Induced by L-rhamnose via the RhaR-RhaS regulatory cascade. Binding of the cAMP receptor protein (CRP) is required for full expression. Also induced by L-lyxose.3 Publications

    Interactioni

    Subunit structurei

    Monomer.UniRule annotation1 Publication

    Protein-protein interaction databases

    IntActiP32171, 2 interactors
    STRINGi316385.ECDH10B_4094

    Structurei

    Secondary structure

    1489
    Legend: HelixTurnBeta strandPDB Structure known for this area
    Show more details
    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Beta strandi4 – 11Combined sources8
    Beta strandi13 – 24Combined sources12
    Turni25 – 28Combined sources4
    Beta strandi29 – 39Combined sources11
    Beta strandi43 – 45Combined sources3
    Beta strandi48 – 50Combined sources3
    Helixi53 – 69Combined sources17
    Beta strandi74 – 81Combined sources8
    Beta strandi86 – 89Combined sources4
    Beta strandi91 – 93Combined sources3
    Beta strandi95 – 97Combined sources3
    Helixi105 – 107Combined sources3
    Helixi110 – 118Combined sources9
    Helixi120 – 127Combined sources8
    Helixi136 – 146Combined sources11
    Helixi148 – 153Combined sources6
    Beta strandi156 – 159Combined sources4
    Helixi160 – 169Combined sources10
    Helixi176 – 179Combined sources4
    Helixi180 – 182Combined sources3
    Turni187 – 189Combined sources3
    Beta strandi190 – 192Combined sources3
    Helixi194 – 200Combined sources7
    Helixi204 – 206Combined sources3
    Beta strandi216 – 221Combined sources6
    Beta strandi223 – 225Combined sources3
    Beta strandi227 – 231Combined sources5
    Helixi237 – 244Combined sources8
    Beta strandi252 – 269Combined sources18
    Helixi274 – 279Combined sources6
    Beta strandi282 – 284Combined sources3
    Helixi287 – 289Combined sources3
    Beta strandi291 – 297Combined sources7
    Helixi301 – 309Combined sources9
    Helixi315 – 322Combined sources8
    Beta strandi327 – 330Combined sources4
    Helixi337 – 339Combined sources3
    Helixi345 – 355Combined sources11
    Helixi364 – 390Combined sources27
    Beta strandi395 – 401Combined sources7
    Helixi402 – 405Combined sources4
    Helixi407 – 417Combined sources11
    Beta strandi419 – 423Combined sources5
    Helixi428 – 440Combined sources13
    Helixi447 – 455Combined sources9
    Beta strandi461 – 463Combined sources3
    Helixi470 – 479Combined sources10

    3D structure databases

    Select the link destinations:
    PDBei
    RCSB PDBi
    PDBji
    Links Updated
    PDB entryMethodResolution (Å)ChainPositionsPDBsum
    2CGJX-ray2.26A1-489[»]
    2CGKX-ray2.46A/B1-489[»]
    2CGLX-ray1.88A1-489[»]
    ProteinModelPortaliP32171
    SMRiP32171
    ModBaseiSearch...
    MobiDBiSearch...

    Miscellaneous databases

    EvolutionaryTraceiP32171

    Family & Domainsi

    Region

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Regioni236 – 238Substrate bindingUniRule annotation1 Publication3

    Sequence similaritiesi

    Belongs to the rhamnulokinase family.UniRule annotation

    Phylogenomic databases

    eggNOGiENOG4105DET Bacteria
    COG1070 LUCA
    HOGENOMiHOG000250110
    InParanoidiP32171
    KOiK00848
    OMAiLMPDLFN
    PhylomeDBiP32171

    Family and domain databases

    CDDicd07771 FGGY_RhuK, 1 hit
    HAMAPiMF_01535 Rhamnulokinase, 1 hit
    InterProiView protein in InterPro
    IPR018485 Carb_kinase_FGGY_C
    IPR018484 Carb_kinase_FGGY_N
    IPR013449 Rhamnulokinase
    PfamiView protein in Pfam
    PF02782 FGGY_C, 1 hit
    PF00370 FGGY_N, 1 hit
    TIGRFAMsiTIGR02627 rhamnulo_kin, 1 hit

    Sequencei

    Sequence statusi: Complete.

    P32171-1 [UniParc]FASTAAdd to basket

    « Hide

            10         20         30         40         50
    MTFRNCVAVD LGASSGRVML ARYERECRSL TLREIHRFNN GLHSQNGYVT
    60 70 80 90 100
    WDVDSLESAI RLGLNKVCEE GIRIDSIGID TWGVDFVLLD QQGQRVGLPV
    110 120 130 140 150
    AYRDSRTNGL MAQAQQQLGK RDIYQRSGIQ FLPFNTLYQL RALTEQQPEL
    160 170 180 190 200
    IPHIAHALLM PDYFSYRLTG KMNWEYTNAT TTQLVNINSD DWDESLLAWS
    210 220 230 240 250
    GANKAWFGRP THPGNVIGHW ICPQGNEIPV VAVASHDTAS AVIASPLNGS
    260 270 280 290 300
    RAAYLSSGTW SLMGFESQTP FTNDTALAAN ITNEGGAEGR YRVLKNIMGL
    310 320 330 340 350
    WLLQRVLQEQ QINDLPALIS ATQALPACRF IINPNDDRFI NPETMCSEIQ
    360 370 380 390 400
    AACRETAQPI PESDAELARC IFDSLALLYA DVLHELAQLR GEDFSQLHIV
    410 420 430 440 450
    GGGCQNTLLN QLCADACGIR VIAGPVEAST LGNIGIQLMT LDELNNVDDF
    460 470 480
    RQVVSTTANL TTFTPNPDSE IAHYVAQIHS TRQTKELCA
    Length:489
    Mass (Da):54,069
    Last modified:October 1, 1993 - v1
    Checksum:iAF66259EACAC5F4E
    GO

    Sequence cautioni

    The sequence CAA43001 differs from that shown. Reason: Frameshift at position 398.Curated

    Experimental Info

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    Sequence conflicti214Missing in CAA43001 (PubMed:8396120).Curated1
    Sequence conflicti388 – 389QL → HV in CAA43001 (PubMed:8396120).Curated2

    Sequence databases

    Select the link destinations:
    EMBLi
    GenBanki
    DDBJi
    Links Updated
    X60472 Genomic DNA Translation: CAA43001.1 Frameshift.
    L19201 Genomic DNA Translation: AAB03037.1
    U00096 Genomic DNA Translation: AAC76886.1
    AP009048 Genomic DNA Translation: BAE77405.1
    PIRiS40848
    RefSeqiNP_418340.1, NC_000913.3
    WP_000144073.1, NZ_LN832404.1

    Genome annotation databases

    EnsemblBacteriaiAAC76886; AAC76886; b3904
    BAE77405; BAE77405; BAE77405
    GeneIDi948399
    KEGGiecj:JW3875
    eco:b3904
    PATRICifig|1411691.4.peg.2802

    Similar proteinsi

    Entry informationi

    Entry nameiRHAB_ECOLI
    AccessioniPrimary (citable) accession number: P32171
    Secondary accession number(s): Q2M8K1
    Entry historyiIntegrated into UniProtKB/Swiss-Prot: October 1, 1993
    Last sequence update: October 1, 1993
    Last modified: March 28, 2018
    This is version 128 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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