SSRP_METPP
ID SSRP_METPP Reviewed; 155 AA.
AC A2SG89;
DT 15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT 06-MAR-2007, sequence version 1.
DT 25-MAY-2022, entry version 84.
DE RecName: Full=SsrA-binding protein {ECO:0000255|HAMAP-Rule:MF_00023};
DE AltName: Full=Small protein B {ECO:0000255|HAMAP-Rule:MF_00023};
GN Name=smpB {ECO:0000255|HAMAP-Rule:MF_00023}; OrderedLocusNames=Mpe_A1616;
OS Methylibium petroleiphilum (strain ATCC BAA-1232 / LMG 22953 / PM1).
OC Bacteria; Proteobacteria; Betaproteobacteria; Burkholderiales; Methylibium.
OX NCBI_TaxID=420662;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC BAA-1232 / LMG 22953 / PM1;
RX PubMed=17158667; DOI=10.1128/jb.01259-06;
RA Kane S.R., Chakicherla A.Y., Chain P.S.G., Schmidt R., Shin M.W.,
RA Legler T.C., Scow K.M., Larimer F.W., Lucas S.M., Richardson P.M.,
RA Hristova K.R.;
RT "Whole-genome analysis of the methyl tert-butyl ether-degrading beta-
RT proteobacterium Methylibium petroleiphilum PM1.";
RL J. Bacteriol. 189:1931-1945(2007).
CC -!- FUNCTION: Required for rescue of stalled ribosomes mediated by trans-
CC translation. Binds to transfer-messenger RNA (tmRNA), required for
CC stable association of tmRNA with ribosomes. tmRNA and SmpB together
CC mimic tRNA shape, replacing the anticodon stem-loop with SmpB. tmRNA is
CC encoded by the ssrA gene; the 2 termini fold to resemble tRNA(Ala) and
CC it encodes a 'tag peptide', a short internal open reading frame. During
CC trans-translation Ala-aminoacylated tmRNA acts like a tRNA, entering
CC the A-site of stalled ribosomes, displacing the stalled mRNA. The
CC ribosome then switches to translate the ORF on the tmRNA; the nascent
CC peptide is terminated with the 'tag peptide' encoded by the tmRNA and
CC targeted for degradation. The ribosome is freed to recommence
CC translation, which seems to be the essential function of trans-
CC translation. {ECO:0000255|HAMAP-Rule:MF_00023}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00023}.
CC Note=The tmRNA-SmpB complex associates with stalled 70S ribosomes.
CC {ECO:0000255|HAMAP-Rule:MF_00023}.
CC -!- SIMILARITY: Belongs to the SmpB family. {ECO:0000255|HAMAP-
CC Rule:MF_00023}.
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DR EMBL; CP000555; ABM94578.1; -; Genomic_DNA.
DR RefSeq; WP_011829215.1; NC_008825.1.
DR AlphaFoldDB; A2SG89; -.
DR SMR; A2SG89; -.
DR STRING; 420662.Mpe_A1616; -.
DR EnsemblBacteria; ABM94578; ABM94578; Mpe_A1616.
DR KEGG; mpt:Mpe_A1616; -.
DR eggNOG; COG0691; Bacteria.
DR HOGENOM; CLU_108953_3_0_4; -.
DR OMA; WTNHSAR; -.
DR OrthoDB; 1720952at2; -.
DR Proteomes; UP000000366; Chromosome.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0003723; F:RNA binding; IEA:UniProtKB-UniRule.
DR GO; GO:0070929; P:trans-translation; IEA:UniProtKB-UniRule.
DR CDD; cd09294; SmpB; 1.
DR Gene3D; 2.40.280.10; -; 1.
DR HAMAP; MF_00023; SmpB; 1.
DR InterPro; IPR023620; SmpB.
DR InterPro; IPR000037; SsrA-bd_prot.
DR InterPro; IPR020081; SsrA-bd_prot_CS.
DR PANTHER; PTHR30308; PTHR30308; 1.
DR Pfam; PF01668; SmpB; 1.
DR SUPFAM; SSF74982; SSF74982; 1.
DR TIGRFAMs; TIGR00086; smpB; 1.
DR PROSITE; PS01317; SSRP; 1.
PE 3: Inferred from homology;
KW Cytoplasm; Reference proteome; RNA-binding.
FT CHAIN 1..155
FT /note="SsrA-binding protein"
FT /id="PRO_1000002083"
FT REGION 123..155
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 155 AA; 17823 MW; C4FFA637AA14E653 CRC64;
MAIADNKKAR FNYTIEEQFE AGMVLEGWEV KAIRAGQVQL TDGYVVVKDG ELFLIGCRIN
PLRTASTHVH PQADRTKKLL MKKDEIRRLV GKVEQKGYTL VPLNLHYKGG RVKADIALAK
GKDLHDKRET EKKRDWEREK GQLMRHKISS PRKDT
