ID   SSRP_GRAFK              Reviewed;         157 AA.
AC   A0M3P0;
DT   29-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT   12-DEC-2006, sequence version 1.
DT   25-MAY-2022, entry version 86.
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=GFO_2270;
OS   Gramella forsetii (strain KT0803).
OC   Bacteria; Bacteroidetes; Flavobacteriia; Flavobacteriales;
OC   Flavobacteriaceae; Gramella.
OX   NCBI_TaxID=411154;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=KT0803;
RX   PubMed=17107561; DOI=10.1111/j.1462-2920.2006.01152.x;
RA   Bauer M., Kube M., Teeling H., Richter M., Lombardot T., Allers E.,
RA   Wuerdemann C.A., Quast C., Kuhl H., Knaust F., Woebken D., Bischof K.,
RA   Mussmann M., Choudhuri J.V., Meyer F., Reinhardt R., Amann R.I.,
RA   Gloeckner F.O.;
RT   "Whole genome analysis of the marine Bacteroidetes'Gramella forsetii'
RT   reveals adaptations to degradation of polymeric organic matter.";
RL   Environ. Microbiol. 8:2201-2213(2006).
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; CU207366; CAL67235.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0M3P0; -.
DR   SMR; A0M3P0; -.
DR   STRING; 411154.GFO_2270; -.
DR   EnsemblBacteria; CAL67235; CAL67235; GFO_2270.
DR   KEGG; gfo:GFO_2270; -.
DR   eggNOG; COG0691; Bacteria.
DR   HOGENOM; CLU_108953_0_1_10; -.
DR   OMA; WTNHSAR; -.
DR   Proteomes; UP000000755; 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; RNA-binding.
FT   CHAIN           1..157
FT                   /note="SsrA-binding protein"
FT                   /id="PRO_0000331050"
SQ   SEQUENCE   157 AA;  18667 MW;  E72BC8CA2276C94C CRC64;
     MYFCGYMKNS INIKNRKAKF NYEFLDKYTA GIKLAGTEIK AIREGKANIA ESFCEFNNHE
     LFVINMHVEE YSHATHFNHN PRSQRKLLLQ RRELRKLEKE VTNSGLTIIP LRLFINDRGL
     AKLQISLAKG KKLYDKRETI KDRESKRRLD RIQKEYK