ID   SSRP_RHORT              Reviewed;         160 AA.
AC   Q2RT81;
DT   29-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT   24-JAN-2006, sequence version 1.
DT   25-MAY-2022, entry version 88.
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=Rru_A1864;
OS   Rhodospirillum rubrum (strain ATCC 11170 / ATH 1.1.1 / DSM 467 / LMG 4362 /
OS   NCIMB 8255 / S1).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodospirillales;
OC   Rhodospirillaceae; Rhodospirillum.
OX   NCBI_TaxID=269796;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 11170 / ATH 1.1.1 / DSM 467 / LMG 4362 / NCIMB 8255 / S1;
RX   PubMed=21886856; DOI=10.4056/sigs.1804360;
RA   Munk A.C., Copeland A., Lucas S., Lapidus A., Del Rio T.G., Barry K.,
RA   Detter J.C., Hammon N., Israni S., Pitluck S., Brettin T., Bruce D.,
RA   Han C., Tapia R., Gilna P., Schmutz J., Larimer F., Land M., Kyrpides N.C.,
RA   Mavromatis K., Richardson P., Rohde M., Goeker M., Klenk H.P., Zhang Y.,
RA   Roberts G.P., Reslewic S., Schwartz D.C.;
RT   "Complete genome sequence of Rhodospirillum rubrum type strain (S1).";
RL   Stand. Genomic Sci. 4:293-302(2011).
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; CP000230; ABC22664.1; -; Genomic_DNA.
DR   RefSeq; WP_011389617.1; NC_007643.1.
DR   RefSeq; YP_426951.1; NC_007643.1.
DR   AlphaFoldDB; Q2RT81; -.
DR   SMR; Q2RT81; -.
DR   STRING; 269796.Rru_A1864; -.
DR   EnsemblBacteria; ABC22664; ABC22664; Rru_A1864.
DR   KEGG; rru:Rru_A1864; -.
DR   PATRIC; fig|269796.9.peg.1942; -.
DR   eggNOG; COG0691; Bacteria.
DR   HOGENOM; CLU_108953_0_1_5; -.
DR   OMA; WTNHSAR; -.
DR   OrthoDB; 1720952at2; -.
DR   PhylomeDB; Q2RT81; -.
DR   Proteomes; UP000001929; 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..160
FT                   /note="SsrA-binding protein"
FT                   /id="PRO_0000331087"
SQ   SEQUENCE   160 AA;  18252 MW;  524577401F4DE0DA CRC64;
     MARAGNSLIS HGRVAENRRA RHDYSIEETI EAGLILVGTE VKSLRTGRAN IADSYAGPKS
     GELYLYNAYI PDWTQAVKAF AHEPRQPRKL LVHRREARRL ISAINKDGMT LVPLYLYFND
     RGFAKVQLGL AKGRKAHDKR QAIKEREWNR DKARVLRDKG