UniProtKB - P0AAN3 (HYPB_ECOLI)
Protein
Hydrogenase maturation factor HypB
Gene
hypB
Organism
Escherichia coli (strain K12)
Status
Functioni
Involved in the maturation of [NiFe] hydrogenases. Required for nickel insertion into the metal center of the hydrogenase (PubMed:7601092, PubMed:8756471). Exhibits a low intrinsic GTPase activity, which is essential for nickel insertion (PubMed:7601092, PubMed:21544686, PubMed:27951644). In the presence of GDP, nickel, but not zinc, is transferred from the HypB GTPase domain (G-domain) to HypA (PubMed:23899293, PubMed:27951644).5 Publications
Activity regulationi
Binding of zinc or nickel in the G-domain decreases GTPase activity (PubMed:21544686). Once GTP hydrolysis is triggered, probably via a GTPase activating protein, the GDP-loaded state may enhance HypA-HypB complex formation and reduces the affinity of HypB for nickel, which is then transferred to HypA (PubMed:27951644). In contrast to nickel, zinc reduces the formation of complexes with HypA (PubMed:27951644).2 Publications
Kineticsi
kcat is 0.18 min(-1) for GTPase activity. kcat is 0.04 min1 for GTPase activity in the presence of 1 µM Zn(II). kcat is 0.10 min(-1) for GTPase activity in the presence of 10 µM Ni(II).1 Publication
Sites
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Metal bindingi | 2 | Nickel 12 Publications | 1 | |
Metal bindingi | 5 | Nickel 12 Publications | 1 | |
Metal bindingi | 7 | Nickel 12 Publications | 1 | |
Metal bindingi | 166 | Nickel 2 or zinc2 Publications | 1 | |
Metal bindingi | 167 | Nickel 2 or zinc2 Publications | 1 | |
Metal bindingi | 198 | Nickel 2 or zinc1 Publication | 1 |
GO - Molecular functioni
- GTPase activity Source: EcoCyc
- GTP binding Source: UniProtKB-KW
- nickel cation binding Source: EcoCyc
- zinc ion binding Source: EcoCyc
GO - Biological processi
- protein maturation Source: EcoCyc
Keywordsi
Molecular function | Hydrolase |
Ligand | GTP-binding, Metal-binding, Nickel, Nucleotide-binding, Zinc |
Enzyme and pathway databases
BioCyci | EcoCyc:EG10484-MONOMER MetaCyc:EG10484-MONOMER |
Names & Taxonomyi
Protein namesi | Recommended name: Hydrogenase maturation factor HypBCuratedAlternative name(s): Hydrogenase isoenzymes nickel incorporation protein HypBCurated |
Gene namesi | Name:hypB Ordered Locus Names:b2727, JW2697 |
Organismi | Escherichia coli (strain K12) |
Taxonomic identifieri | 83333 [NCBI] |
Taxonomic lineagei | Bacteria › Proteobacteria › Gammaproteobacteria › Enterobacterales › Enterobacteriaceae › Escherichia › |
Proteomesi |
|
Pathology & Biotechi
Mutagenesis
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Mutagenesisi | 2 | C → A: Decreases nickel content. Disruption of the N-terminal metal-binding site; when associated with A-5 and A-7. 1 Publication | 1 | |
Mutagenesisi | 5 | C → A: Decreases nickel content. Disruption of the N-terminal metal-binding site; when associated with A-3 and A-7. 1 Publication | 1 | |
Mutagenesisi | 7 | C → A: Decreases nickel content. Decreases hydrogenase activity of the cell. Disruption of the N-terminal metal-binding site; when associated with A-3 and A-5. 2 Publications | 1 | |
Mutagenesisi | 78 – 80 | LEV → AEA: Disrupts interaction with HypA. Can only partially restore hydrogenase production in a hypB deletion mutant. 1 Publication | 3 | |
Mutagenesisi | 117 | K → N: Important decrease in GTPase activity. 1 Publication | 1 | |
Mutagenesisi | 166 | C → A: Does not affect nickel content. Mutant lacks hydrogenase activity. 2 Publications | 1 | |
Mutagenesisi | 167 | H → A: Does not affect nickel content. Mutant lacks hydrogenase activity. 2 Publications | 1 | |
Mutagenesisi | 198 | C → A: Does not affect nickel content. 1 Publication | 1 | |
Mutagenesisi | 241 | D → N: 85-fold decrease in kcat/KM value of GTPase activity and loss of the specificity for GTP. 1 Publication | 1 | |
Mutagenesisi | 242 | L → A: Cannot form dimers. Can still bind metal in both sites and activate GTP hydrolysis, but hydrogenase activity of the cell is decreased; when associated with A-246. 1 Publication | 1 | |
Mutagenesisi | 246 | L → A: Cannot form dimers. Can still bind metal in both sites and activate GTP hydrolysis, but hydrogenase activity of the cell is decreased; when associated with A-242. 1 Publication | 1 |
PTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
ChainiPRO_0000201440 | 1 – 290 | Hydrogenase maturation factor HypBAdd BLAST | 290 |
Proteomic databases
jPOSTi | P0AAN3 |
PaxDbi | P0AAN3 |
PRIDEi | P0AAN3 |
2D gel databases
SWISS-2DPAGEi | P0AAN3 |
Interactioni
Subunit structurei
Binary interactionsi
Hide detailsProtein-protein interaction databases
BioGRIDi | 4261427, 13 interactors |
ComplexPortali | CPX-5056, HypAB Ni-hydrogenase maturation complex |
DIPi | DIP-36428N |
IntActi | P0AAN3, 9 interactors |
MINTi | P0AAN3 |
STRINGi | 511145.b2727 |
Family & Domainsi
Region
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Regioni | 106 – 267 | G-domainCuratedAdd BLAST | 162 |
Domaini
The N-terminal region contains a high-affinity nickel-binding site and the C-terminal G-domain contains a low-affinity metal-binding site, which is not selective for nickel and could possibly accommodate other divalent metals (PubMed:16142921, PubMed:18942856). Both metal sites are critical for the maturation of the hydrogenases (PubMed:18942856).2 Publications
Sequence similaritiesi
Phylogenomic databases
eggNOGi | COG0378, Bacteria |
HOGENOMi | CLU_056148_1_0_6 |
InParanoidi | P0AAN3 |
PhylomeDBi | P0AAN3 |
Family and domain databases
CDDi | cd05390, HypB, 1 hit |
InterProi | View protein in InterPro IPR003495, CobW/HypB/UreG_dom IPR004392, Hyd_mat_HypB IPR027417, P-loop_NTPase |
PANTHERi | PTHR30134, PTHR30134, 1 hit |
Pfami | View protein in Pfam PF02492, cobW, 1 hit |
SUPFAMi | SSF52540, SSF52540, 1 hit |
TIGRFAMsi | TIGR00073, hypB, 1 hit |
i Sequence
Sequence statusi: Complete.
P0AAN3-1 [UniParc]FASTAAdd to basket
10 20 30 40 50
MCTTCGCGEG NLYIEGDEHN PHSAFRSAPF APAARPKMKI TGIKAPEFTP
60 70 80 90 100
SQTEEGDLHY GHGEAGTHAP GMSQRRMLEV EIDVLDKNNR LAERNRARFA
110 120 130 140 150
ARKQLVLNLV SSPGSGKTTL LTETLMRLKD SVPCAVIEGD QQTVNDAARI
160 170 180 190 200
RATGTPAIQV NTGKGCHLDA QMIADAAPRL PLDDNGILFI ENVGNLVCPA
210 220 230 240 250
SFDLGEKHKV AVLSVTEGED KPLKYPHMFA AASLMLLNKV DLLPYLNFDV
260 270 280 290
EKCIACAREV NPEIEIILIS ATSGEGMDQW LNWLETQRCA
Experimental Info
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Sequence conflicti | 36 | P → R in CAA38413 (PubMed:1849603).Curated | 1 |
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | X54543 Genomic DNA Translation: CAA38413.1 U29579 Genomic DNA Translation: AAA69237.1 U00096 Genomic DNA Translation: AAC75769.1 AP009048 Genomic DNA Translation: BAE76804.1 |
PIRi | C65053 |
RefSeqi | NP_417207.1, NC_000913.3 WP_000337665.1, NZ_SSUR01000024.1 |
Genome annotation databases
EnsemblBacteriai | AAC75769; AAC75769; b2727 BAE76804; BAE76804; BAE76804 |
GeneIDi | 57728616 947194 |
KEGGi | ecj:JW2697 eco:b2727 |
PATRICi | fig|1411691.4.peg.4014 |
Similar proteinsi
Cross-referencesi
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | X54543 Genomic DNA Translation: CAA38413.1 U29579 Genomic DNA Translation: AAA69237.1 U00096 Genomic DNA Translation: AAC75769.1 AP009048 Genomic DNA Translation: BAE76804.1 |
PIRi | C65053 |
RefSeqi | NP_417207.1, NC_000913.3 WP_000337665.1, NZ_SSUR01000024.1 |
3D structure databases
SMRi | P0AAN3 |
ModBasei | Search... |
Protein-protein interaction databases
BioGRIDi | 4261427, 13 interactors |
ComplexPortali | CPX-5056, HypAB Ni-hydrogenase maturation complex |
DIPi | DIP-36428N |
IntActi | P0AAN3, 9 interactors |
MINTi | P0AAN3 |
STRINGi | 511145.b2727 |
2D gel databases
SWISS-2DPAGEi | P0AAN3 |
Proteomic databases
jPOSTi | P0AAN3 |
PaxDbi | P0AAN3 |
PRIDEi | P0AAN3 |
Genome annotation databases
EnsemblBacteriai | AAC75769; AAC75769; b2727 BAE76804; BAE76804; BAE76804 |
GeneIDi | 57728616 947194 |
KEGGi | ecj:JW2697 eco:b2727 |
PATRICi | fig|1411691.4.peg.4014 |
Organism-specific databases
EchoBASEi | EB0479 |
Phylogenomic databases
eggNOGi | COG0378, Bacteria |
HOGENOMi | CLU_056148_1_0_6 |
InParanoidi | P0AAN3 |
PhylomeDBi | P0AAN3 |
Enzyme and pathway databases
BioCyci | EcoCyc:EG10484-MONOMER MetaCyc:EG10484-MONOMER |
Miscellaneous databases
PROi | PR:P0AAN3 |
Family and domain databases
CDDi | cd05390, HypB, 1 hit |
InterProi | View protein in InterPro IPR003495, CobW/HypB/UreG_dom IPR004392, Hyd_mat_HypB IPR027417, P-loop_NTPase |
PANTHERi | PTHR30134, PTHR30134, 1 hit |
Pfami | View protein in Pfam PF02492, cobW, 1 hit |
SUPFAMi | SSF52540, SSF52540, 1 hit |
TIGRFAMsi | TIGR00073, hypB, 1 hit |
ProtoNeti | Search... |
MobiDBi | Search... |
Entry informationi
Entry namei | HYPB_ECOLI | |
Accessioni | P0AAN3Primary (citable) accession number: P0AAN3 Secondary accession number(s): P24190, Q2MAA2, Q46884 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | October 11, 2005 |
Last sequence update: | October 11, 2005 | |
Last modified: | February 10, 2021 | |
This is version 105 of the entry and version 1 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Prokaryotic Protein Annotation Program |
Miscellaneousi
Keywords - Technical termi
Direct protein sequencing, Reference proteomeDocuments
- SIMILARITY comments
Index of protein domains and families