Protein: Stringent starvation protein B (Adapter protein SspB) (Specificity-enhancing factor SspB) (P0AFZ3)
Organism: Escherichia coli (strain K12)
Function: Enhances recognition of ssrA-tagged proteins by the ClpX-ClpP protease; the ssrA degradation tag (AANDENYALAA) is added trans-translationally to proteins that are stalled on the ribosome, freeing the ribosome and targeting stalled peptides for degradation. SspB activates the ATPase activity of ClpX. Seems to act in concert with SspA in the regulation of several proteins during exponential and stationary-phase growth.
Sequence: MDLSQLTPRRPYLLRAFYEWLLDNQLTPHLVVDVTLPGVQVPMEYARDGQIVLNIAPRAVGNLELANDEVRFNARFGGIPRQVSVPLAAVLAIYARENGAGTMFEPEAAYDEDTSIMNDEEASADNETVMSVIDGDKPDHDDDTHPDDEPPQPPRGGRPALRVVK
InterPro domains: - IPR007481: Stringent starvation protein B (family) [3-165]
- IPR036760: SspB-like superfamily (homologous_superfamily) [1-119]
Interaction partners: - Stringent starvation protein A
- ATP-dependent Clp protease ATP-binding subunit ClpX
- Anti-sigma-E factor RseA
- ATP-dependent Clp protease proteolytic subunit
- ATP-dependent Clp protease ATP-binding subunit ClpA
- ATP-dependent Clp protease adapter protein ClpS
- Regulator of RpoS
- Cell division protein FtsB
- Outer membrane protein assembly factor BamE
- DNA polymerase III subunit delta
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0097159 (organic cyclic compound binding), GO:1901363 (heterocyclic compound binding), GO:0005515 (protein binding), GO:0003676 (nucleic acid binding), GO:0003677 (DNA binding), GO:0003690 (double-stranded DNA binding), GO:0000217 (DNA secondary structure binding), GO:0003680 (minor groove of adenine-thymine-rich DNA binding)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0009987 (cellular process), GO:0009058 (biosynthetic process), GO:0044237 (cellular metabolic process), GO:0044281 (small molecule metabolic process), GO:0006807 (nitrogen compound metabolic process), GO:0071704 (organic substance metabolic process), GO:0044238 (primary metabolic process), GO:1901360 (organic cyclic compound metabolic process), GO:1901576 (organic substance biosynthetic process), GO:1901564 (organonitrogen compound metabolic process), GO:0006139 (nucleobase-containing compound metabolic process), GO:0046483 (heterocycle metabolic process), GO:0055086 (nucleobase-containing small molecule metabolic process), GO:0019637 (organophosphate metabolic process), GO:0044249 (cellular biosynthetic process), GO:0006725 (cellular aromatic compound metabolic process), GO:0034641 (cellular nitrogen compound metabolic process), GO:1901135 (carbohydrate derivative metabolic process), GO:0006793 (phosphorus metabolic process), GO:1901566 (organonitrogen compound biosynthetic process), GO:1901362 (organic cyclic compound biosynthetic process), GO:0006753 (nucleoside phosphate metabolic process), GO:0019438 (aromatic compound biosynthetic process), GO:0019693 (ribose phosphate metabolic process), GO:0018130 (heterocycle biosynthetic process), GO:0090407 (organophosphate biosynthetic process), GO:0044271 (cellular nitrogen compound biosynthetic process), GO:0006796 (phosphate-containing compound metabolic process), GO:0072521 (purine-containing compound metabolic process), GO:1901137 (carbohydrate derivative biosynthetic process), GO:0034654 (nucleobase-containing compound biosynthetic process), GO:0009259 (ribonucleotide metabolic process), GO:0009141 (nucleoside triphosphate metabolic process), GO:0009117 (nucleotide metabolic process), GO:0046390 (ribose phosphate biosynthetic process), GO:0006163 (purine nucleotide metabolic process), GO:0072522 (purine-containing compound biosynthetic process), GO:1901293 (nucleoside phosphate biosynthetic process), GO:0009165 (nucleotide biosynthetic process), GO:0009144 (purine nucleoside triphosphate metabolic process), GO:0006164 (purine nucleotide biosynthetic process), GO:0009150 (purine ribonucleotide metabolic process), GO:0009260 (ribonucleotide biosynthetic process), GO:0009199 (ribonucleoside triphosphate metabolic process), GO:0009142 (nucleoside triphosphate biosynthetic process), GO:0009201 (ribonucleoside triphosphate biosynthetic process), GO:0009152 (purine ribonucleotide biosynthetic process), GO:0046034 (ATP metabolic process), GO:0009145 (purine nucleoside triphosphate biosynthetic process), GO:0009205 (purine ribonucleoside triphosphate metabolic process), GO:0006754 (ATP biosynthetic process), GO:0009206 (purine ribonucleoside triphosphate biosynthetic process), GO:0015986 (proton motive force-driven ATP synthesis)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005737 (cytoplasm), GO:0005829 (cytosol), GO:0005622 (intracellular anatomical structure)