STRINGSTRING
STRING protein interaction network
Nodes:
Network nodes represent proteins
splice isoforms or post-translational modifications are collapsed, i.e. each node represents all the proteins produced by a single, protein-coding gene locus.
Node Color
colored nodes:
query proteins and first shell of interactors
white nodes:
second shell of interactors
Node Content
empty nodes:
proteins of unknown 3D structure
filled nodes:
a 3D structure is known or predicted
Edges:
Edges represent protein-protein associations
associations are meant to be specific and meaningful, i.e. proteins jointly contribute to a shared function; this does not necessarily mean they are physically binding to each other.
Known Interactions
from curated databases
experimentally determined
Predicted Interactions
gene neighborhood
gene fusions
gene co-occurrence
Others
textmining
co-expression
protein homology
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[Homology]
Score
sppAProtease IV (signal peptide peptidase); Digests cleaved signal peptides in vitro, its in vivo function is unknown. This activity is necessary to maintain proper secretion of mature proteins across the membrane. Belongs to the peptidase S49 family. (618 aa)    
Predicted Functional Partners:
ansA
Cytoplasmic L-asparaginase 1; Protein involved in cellular amino acid catabolic process; Belongs to the asparaginase 1 family.
 
    0.768
lepB
Leader peptidase (signal peptidase I); Belongs to the peptidase S26 family.
      
 0.744
htpX
Putative endopeptidase; Membrane-localized protease able to endoproteolytically degrade overproduced SecY but not YccA, another membrane protein. It seems to cleave SecY at specific cytoplasmic sites. Does not require ATP. Its natural substrate has not been identified. Probably plays a role in the quality control of integral membrane proteins. Belongs to the peptidase M48B family.
   
 0.708
mepM
Murein DD-endopeptidase, space-maker hydrolase, septation protein; A murein DD-endopeptidase with specificity for D-Ala-meso- diaminopimelic acid (mDAP) cross-links. Its role is probably to cleave D-Ala-mDAP cross-links to allow insertion of new glycans and thus cell wall expansion. Functionally redundant with MepM and MepH. Partially suppresses an mepS disruption mutant.
 
    0.659
ydjA
Putative oxidoreductase; Belongs to the nitroreductase family.
     
 0.653
clpP
Proteolytic subunit of ClpA-ClpP and ClpX-ClpP ATP-dependent serine proteases; Cleaves peptides in various proteins in a process that requires ATP hydrolysis. Has a chymotrypsin-like activity. Plays a major role in the degradation of misfolded proteins. May play the role of a master protease which is attracted to different substrates by different specificity factors such as ClpA or ClpX. Participates in the final steps of RseA-sigma-E degradation, liberating sigma-E to induce the extracytoplasmic-stress response. Degrades antitoxin MazE.
      
 0.565
ptrA
Protease III; Endopeptidase that degrades small peptides of less than 7 kDa, such as glucagon and insulin.
      
 0.544
ptrB
Protease II; Cleaves peptide bonds on the C-terminal side of lysyl and argininyl residues; Belongs to the peptidase S9A family.
  
   
 0.521
pncA
Nicotinamidase/pyrazinamidase; Catalyzes the deamidation of nicotinamide (NAM) into nicotinate. Likely functions in the cyclical salvage pathway for production of NAD from nicotinamide.
     
 0.519
pspA
Regulatory protein for phage-shock-protein operon; The phage shock protein (psp) operon (pspABCDE) may play a significant role in the competition for survival under nutrient- or energy-limited conditions. PspA negatively regulates expression of the pspABCDE promoter and of pspG through negative regulation of the psp- specific transcriptional activator PspF. Is also required for membrane integrity, efficient translocation and maintenance of the proton motive force. Belongs to the PspA/IM30 family.
 
  
 0.501
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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