ID   SSRP_CLOB8              Reviewed;         156 AA.
AC   A6LR41;
DT   20-MAY-2008, integrated into UniProtKB/Swiss-Prot.
DT   24-JUL-2007, sequence version 1.
DT   03-AUG-2022, entry version 83.
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=Cbei_0634;
OS   Clostridium beijerinckii (strain ATCC 51743 / NCIMB 8052) (Clostridium
OS   acetobutylicum).
OC   Bacteria; Firmicutes; Clostridia; Eubacteriales; Clostridiaceae;
OC   Clostridium.
OX   NCBI_TaxID=290402;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 51743 / NCIMB 8052;
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C.,
RA   Glavina del Rio T., Hammon N., Israni S., Dalin E., Tice H., Pitluck S.,
RA   Sims D., Brettin T., Bruce D., Tapia R., Brainard J., Schmutz J.,
RA   Larimer F., Land M., Hauser L., Kyrpides N., Mikhailova N., Bennet G.,
RA   Cann I., Chen J.-S., Contreras A.L., Jones D., Kashket E., Mitchell W.,
RA   Stoddard S., Schwarz W., Qureshi N., Young M., Shi Z., Ezeji T., White B.,
RA   Blaschek H., Richardson P.;
RT   "Complete sequence of Clostridium beijerinckii NCIMB 8052.";
RL   Submitted (JUN-2007) to the EMBL/GenBank/DDBJ databases.
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; CP000721; ABR32821.1; -; Genomic_DNA.
DR   RefSeq; WP_011967982.1; NC_009617.1.
DR   AlphaFoldDB; A6LR41; -.
DR   SMR; A6LR41; -.
DR   STRING; 290402.Cbei_0634; -.
DR   EnsemblBacteria; ABR32821; ABR32821; Cbei_0634.
DR   GeneID; 66343539; -.
DR   KEGG; cbe:Cbei_0634; -.
DR   eggNOG; COG0691; Bacteria.
DR   HOGENOM; CLU_108953_0_0_9; -.
DR   OMA; WTNHSAR; -.
DR   OrthoDB; 1720952at2; -.
DR   Proteomes; UP000000565; 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..156
FT                   /note="SsrA-binding protein"
FT                   /id="PRO_1000074347"
SQ   SEQUENCE   156 AA;  18172 MW;  97EB6569479E1FF6 CRC64;
     MARKRNENSL AENRKARHDY FVEEAMEAGL VLVGTEVKSI RNGRVNLKDC YADIYNGEIF
     VKNMHISPYE QGNIFNVDPL RERKLLLHRD EIRRLDGLVS RDGYTLIPLS LYLKDGKVKV
     ALGVCKGKKN YDKRDSMLEK AHKRDMDRAI KEKNKY