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gmhA gmhA tsx tsx phoE phoE tolR tolR tolB tolB pal pal ompF ompF ompA ompA galU galU tonB tonB yciB yciB cirA cirA yeiL yeiL ompC ompC tolQ tolQ exbD exbD exbB exbB gmhB gmhB degP degP fhuA fhuA surA surA tolC tolC hldE hldE fkpA fkpA crp crp ompR ompR hldD hldD waaF waaF waaC waaC waaY waaY waaR waaR waaO waaO waaB waaB waaP waaP waaG waaG waaQ waaQ wecA wecA wecG wecG rfaH rfaH cpxA cpxA cpxR cpxR btuB btuB lamB lamB lepB lepB fepA fepA ompT ompT
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query proteins and first shell of interactors
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second shell of interactors
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proteins of unknown 3D structure
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a 3D structure is known or predicted
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experimentally determined
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gmhAD-sedoheptulose 7-phosphate isomerase; Catalyzes the isomerization of sedoheptulose 7-phosphate in D-glycero-D-manno-heptose 7-phosphate; Belongs to the SIS family. GmhA subfamily. (192 aa)
tsxNucleoside channel, receptor of phage T6 and colicin K; Functions as substrate-specific channel for nucleosides and deoxynucleosides. Has a greater affinity for deoxynucleosides than for nucleosides, and does not transport free bases. In addition, constitutes the receptor for colicin K and phage T6. Belongs to the nucleoside-specific channel-forming outer membrane porin (Tsx) (TC 1.B.10) family. (294 aa)
phoEOuter membrane porin PhoE; Uptake of inorganic phosphate, phosphorylated compounds, and some other negatively charged solutes; Belongs to the Gram-negative porin family. (351 aa)
tolRMembrane spanning protein in TolA-TolQ-TolR complex; Part of the Tol-Pal system, which plays a role in outer membrane invagination during cell division and is important for maintaining outer membrane integrity. Required, with TolQ, for the proton motive force-dependent activation of TolA and for TolA-Pal interaction .The Tol-Pal system is also required for polar localization of chemoreceptors clusters (Probable). There are about 900 TolR molecules per cell. Modeling suggests that non-covalent binding of OmpA (from the outer membrane) and TolR (from the inner membrane) to peptidoglycan [...] (142 aa)
tolBPeriplasmic protein; Part of the Tol-Pal system, which plays a role in outer membrane invagination during cell division and is important for maintaining outer membrane integrity. TolB occupies a key intermediary position in the Tol-Pal system because it communicates directly with both membrane-embedded components, Pal in the outer membrane and TolA in the inner membrane. Is also involved in the uptake of some colicins A. The Tol-Pal system is also required for polar localization of chemoreceptors clusters. (430 aa)
palPeptidoglycan-associated outer membrane lipoprotein; Part of the Tol-Pal system, which plays a role in outer membrane invagination during cell division and is important for maintaining outer membrane integrity. The Tol-Pal system is also required for polar localization of chemoreceptors clusters. (173 aa)
ompFOuter membrane porin 1a (Ia;b;F); Forms pores that allow passive diffusion of small molecules across the outer membrane. (Microbial infection) A mixed OmpC-OmpF heterotrimer is the outer membrane receptor for toxin CdiA-EC536; polymorphisms in extracellular loops 4 and 5 of OmpC confer susceptibility to CdiA- EC536-mediated toxicity; Belongs to the Gram-negative porin family. (362 aa)
ompAOuter membrane protein A (3a;II*;G;d); With TolR probably plays a role in maintaining the position of the peptidoglycan cell wall in the periplasm (Probable). Plays a role in resistance to environmental stress, and a role in outer membrane functionality and cell shape. Non-covalently binds peptidoglycan (Probable). Acts as a porin with low permeability that allows slow penetration of small solutes. A very abundant protein, there can be up to 210,000 OmpA molecules per cell. Reconstitution in unilamellar lipid vesicles shows only about 3% of the protein is in an open conformation, whic [...] (346 aa)
galUGlucose-1-phosphate uridylyltransferase; May play a role in stationary phase survival; Belongs to the UDPGP type 2 family. (302 aa)
tonBMembrane spanning protein in TonB-ExbB-ExbD transport complex; Interacts with outer membrane receptor proteins that carry out high-affinity binding and energy dependent uptake into the periplasmic space of specific substrates such as cobalamin, and various iron compounds (such as iron dicitrate, enterochelin, aerobactin, etc.). In the absence of TonB these receptors bind their substrates but do not carry out active transport. TonB also interacts with some colicins and is involved in the energy-dependent, irreversible steps of bacteriophages phi 80 and T1 infection. It could act to tran [...] (239 aa)
yciBIspA family inner membrane protein; Involved in cell division; probably involved in intracellular septation; Belongs to the YciB family. (179 aa)
cirAColicin IA outer membrane receptor and translocator; Not yet known. Postulated to participate in iron transport. Outer membrane receptor for colicins IA and IB. (663 aa)
yeiLPutative transcriptional regulator; Transcription regulator involved in mid-term, stationary- phase viability under nitrogen starvation. Might control expression of the salvage pathways or in some other way repress the recycling of nucleobases to nucleic acids and enhance their use as general nitrogen sources during nitrogen-limited growth. (219 aa)
ompCOuter membrane porin protein C; Forms pores that allow passive diffusion of small molecules across the outer membrane. (Microbial infection) A mixed OmpC-OmpF heterotrimer is the outer membrane receptor for toxin CdiA-EC536; polymorphisms in extracellular loops 4 and 5 of OmpC confer susceptibility to CdiA- EC536-mediated toxicity; Belongs to the Gram-negative porin family. (367 aa)
tolQMembrane spanning protein in TolA-TolQ-TolR complex; Part of the Tol-Pal system, which plays a role in outer membrane invagination during cell division and is important for maintaining outer membrane integrity. Required, with TolR, for the proton motive force-dependent activation of TolA and for TolA-Pal interaction. Is also involved in the uptake of group A colicins (colicins A, E1, E2, E3, and K) and in the uptake of filamentous phage DNA. The Tol-Pal system is also required for polar localization of chemoreceptors clusters. Belongs to the ExbB/TolQ family. (230 aa)
exbDMembrane spanning protein in TonB-ExbB-ExbD complex; Involved in the TonB-dependent energy-dependent transport of various receptor-bound substrates. (141 aa)
exbBMembrane spanning protein in TonB-ExbB-ExbD complex; Involved in the TonB-dependent energy-dependent transport of various receptor-bound substrates. Protects ExbD from proteolytic degradation and functionally stabilizes TonB. (244 aa)
gmhBD,D-heptose 1,7-bisphosphate phosphatase; Converts the D-glycero-beta-D-manno-heptose 1,7-bisphosphate (beta-HBP) intermediate into D-glycero-beta-D-manno-heptose 1-phosphate by removing the phosphate group at the C-7 position. (191 aa)
degPSerine endoprotease (protease Do), membrane-associated; DegP acts as a chaperone at low temperatures but switches to a peptidase (heat shock protein) at higher temperatures. Degrades transiently denatured and unfolded or misfolded proteins which accumulate in the periplasm following heat shock or other stress conditions. DegP is efficient with Val-Xaa and Ile-Xaa peptide bonds, suggesting a preference for beta-branched side chain amino acids. Only unfolded proteins devoid of disulfide bonds appear capable of being cleaved, thereby preventing non-specific proteolysis of folded proteins. [...] (474 aa)
fhuAFerrichrome outer membrane transporter; Involved in the uptake of iron in complex with ferrichrome, a hydroxamate-type siderophore. Binds and transports ferrichrome-iron across the outer membrane. In addition to its role in ferrichrome-iron transport, transports the antibiotic albomycin, which is a structural analog of ferrichrome, and acts as a receptor for colicin M, microcin J25 and bacteriophages T1, T5, phi80 and UC-1. The energy source, which is required for all FhuA functions except infection by phage T5, is provided by the inner membrane TonB system. (747 aa)
surAPeptidyl-prolyl cis-trans isomerase (PPIase); Chaperone involved in the correct folding and assembly of outer membrane proteins, such as OmpA, OmpF and LamB. Recognizes specific patterns of aromatic residues and the orientation of their side chains, which are found more frequently in integral outer membrane proteins. May act in both early periplasmic and late outer membrane- associated steps of protein maturation. Essential for the survival of E.coli in stationary phase. Required for pilus biogenesis. (428 aa)
tolCTransport channel; Outer membrane channel, which is required for the function of several efflux systems such as AcrAB-TolC, AcrEF-TolC, EmrAB-TolC and MacAB-TolC. These systems are involved in export of antibiotics and other toxic compounds from the cell. TolC is also involved in import of colicin E1 into the cells. (493 aa)
hldEHeptose 7-phosphate kinase and heptose 1-phosphate adenyltransferase; Catalyzes the phosphorylation of D-glycero-D-manno-heptose 7- phosphate at the C-1 position to selectively form D-glycero-beta-D- manno-heptose-1,7-bisphosphate; In the N-terminal section; belongs to the carbohydrate kinase PfkB family. (477 aa)
fkpAFKBP-type peptidyl-prolyl cis-trans isomerase (rotamase); PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. (270 aa)
crpcAMP-activated global transcription factor, mediator of catabolite repression; A global transcription regulator. Complexes with cyclic AMP (cAMP) which allosterically activates DNA binding (to consensus sequence 5'-AAATGTGATCTAGATCACATTT-3') to directly regulate the transcription of about 300 genes in about 200 operons and indirectly regulate the expression of about half the genome. There are 3 classes of CRP promoters; class I promoters have a single CRP-binding site upstream of the RNA polymerase (RNAP)-binding site, whereas in class II promoters the single CRP- and RNAP-binding site [...] (210 aa)
ompRResponse regulator in two-component regulatory system with EnvZ; Member of the two-component regulatory system EnvZ/OmpR involved in osmoregulation (particularly of genes ompF and ompC) as well as other genes. Plays a central role in both acid and osmotic stress responses. Binds to the promoter of both ompC and ompF; at low osmolarity it activates ompF transcription, while at high osmolarity it represses ompF and activates ompC transcription. Involved in acid stress response; this requires EnvZ but not OmpR phosphorylation. Phosphorylated by EnvZ; this stimulates OmpR's DNA-binding abi [...] (239 aa)
hldDADP-L-glycero-D-mannoheptose-6-epimerase, NAD(P)-binding; Catalyzes the interconversion between ADP-D-glycero-beta-D- manno-heptose and ADP-L-glycero-beta-D-manno-heptose via an epimerization at carbon 6 of the heptose; Belongs to the NAD(P)-dependent epimerase/dehydratase family. HldD subfamily. (310 aa)
waaFADP-heptose--lps heptosyltransferase II; lipopolysaccharide core biosynthesis; Protein involved in cell surface antigen activity, host-interacting and lipopolysaccharide core region biosynthetic process. (348 aa)
waaCADP-heptose:LPS heptosyl transferase I; Heptose transfer to the lipopolysaccharide core. It transfers the innermost heptose to [4'-P](3-deoxy-D-manno-octulosonic acid)2-IVA; Belongs to the glycosyltransferase 9 family. (319 aa)
waaYLipopolysaccharide core biosynthesis protein; Catalyzes the phosphorylation of heptose(II) of the outer membrane lipopolysaccharide core; Belongs to the protein kinase superfamily. RfaY/WaaY family. (232 aa)
waaRLipopolysaccharide 1,2-glucosyltransferase; Adds the glucose(II) group on the galactose(I) group of LPS. (338 aa)
waaOUDP-D-galactose:(glucosyl)lipopolysaccharide- alpha-1,3-D-galactosyltransferase; Protein involved in cell surface antigen activity, host-interacting; Belongs to the glycosyltransferase 8 family. (339 aa)
waaBLipopolysaccharide 1,6-galactosyltransferase; Adds a galactose goup to a glucose group of LPS; Belongs to the glycosyltransferase group 1 family. Glycosyltransferase 4 subfamily. (359 aa)
waaPKinase that phosphorylates core heptose of lipopolysaccharide; Catalyzes the phosphorylation of heptose(I) of the outer membrane lipopolysaccharide core. (265 aa)
waaGUDP-glucose:(heptosyl)lipopolysaccharide alpha-1,3-glucosyltransferase; Involved in the addition of the first glucose residue to the lipopolysaccharide core; Belongs to the glycosyltransferase group 1 family. Glycosyltransferase 4 subfamily. (374 aa)
waaQLipopolysaccharide core biosynthesis protein; Catalyzes heptose transfer to the lipopolysaccharide core. It transfers a heptose, called heptose(III), to the heptose(II) of the inner core (By similarity); Belongs to the glycosyltransferase 9 family. (344 aa)
wecAUDP-GlcNAc:undecaprenylphosphate GlcNAc-1-phosphate transferase; Catalyzes the transfer of the GlcNAc-1-phosphate moiety from UDP-GlcNAc onto the carrier lipid undecaprenyl phosphate (C55-P), yielding GlcNAc-pyrophosphoryl-undecaprenyl (GlcNAc-PP-C55). It is the first lipid-linked intermediate involved in enterobacterial common antigen (ECA) synthesis, and an acceptor for the addition of subsequent sugars to complete the biosynthesis of O-antigen lipopolysaccharide (LPS) in many E.coli O types. The apparent affinity of WecA for the polyisoprenyl phosphate substrates increases with the [...] (367 aa)
wecGUDP-N-acetyl-D-mannosaminuronic acid transferase; Catalyzes the synthesis of Und-PP-GlcNAc-ManNAcA (Lipid II), the second lipid-linked intermediate involved in enterobacterial common antigen (ECA) synthesis. (246 aa)
rfaHTranscription antitermination protein; Enhances distal genes transcription elongation in a specialized subset of operons that encode extracytoplasmic components. RfaH is recruited into a multi-component RNA polymerase complex by the ops element, which is a short conserved DNA sequence located downstream of the main promoter of these operons. Once bound, RfaH suppresses pausing and inhibits Rho-dependent and intrinsic termination at a subset of sites. Termination signals are bypassed, which allows complete synthesis of long RNA chains. Enhances expression of several operons involved in [...] (162 aa)
cpxASensory histidine kinase in two-component regulatory system with CpxR; Histidine kinase member of the two-component regulatory system CpxA/CpxR which responds to envelope stress response by activating expression of downstream genes including cpxP, degP, dsbA and ppiA. Activates CpxR by phosphorylation; has autokinase, phosphotransferase and (in the presence of Mg(2+) and/or ATP or ADP) phosphatase activity. The kinase activity is inhibited by periplasmic accessory protein CpxP; proteolysis of CpxP relieves inhibition. Involved in several diverse cellular processes, including the functi [...] (457 aa)
cpxRResponse regulator in two-component regulatory system with CpxA; Response regulator member of the two-component regulatory system CpxA/CpxR which responds to envelope stress response by activating expression of downstream genes including cpxP, degP, dsbA and ppiA. Required for efficient binding of stationary phase cells to hydrophobic surfaces, part of the process of biofilm formation. Induced upon cell surface binding, subsequently induces genes it controls (cpxP, dsbA and spy, degP is only partially induced). Binds and activates transcription from the degP promoter ; binding is enhan [...] (232 aa)
btuBVitamin B12/cobalamin outer membrane transporter; Involved in the active translocation of vitamin B12 (cyanocobalamin) across the outer membrane to the periplasmic space. It derives its energy for transport by interacting with the trans- periplasmic membrane protein TonB. Is also a receptor for bacteriophages BF23 and C1, and for A and E colicins. (614 aa)
lamBMaltose outer membrane porin (maltoporin); Involved in the transport of maltose and maltodextrins, indispensable for translocation of dextrins containing more than three glucosyl moieties. A hydrophobic path ('greasy slide') of aromatic residues serves to guide and select the sugars for transport through the channel. Also acts as a receptor for several bacteriophages including lambda. (446 aa)
lepBLeader peptidase (signal peptidase I); Belongs to the peptidase S26 family. (324 aa)
fepAFerrienterobactin outer membrane transporter; This protein is involved in the initial step of iron uptake by binding ferrienterobactin (Fe-ENT), an iron chelatin siderophore that allows E.coli to extract iron from the environment. FepA also acts as a receptor for colicins B and D. (746 aa)
ompTDLP12 prophage; Protease that can cleave T7 RNA polymerase, ferric enterobactin receptor protein (FEP), antimicrobial peptide protamine and other proteins. This protease has a specificity for paired basic residues. (317 aa)
Your Current Organism:
Escherichia coli K12
NCBI taxonomy Id: 511145
Other names: E. coli str. K-12 substr. MG1655, Escherichia coli MG1655, Escherichia coli str. K-12 substr. MG1655, Escherichia coli str. K12 substr. MG1655, Escherichia coli str. MG1655, Escherichia coli strain MG1655
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