ID   SSRP_STACT              Reviewed;         156 AA.
AC   B9DJK4;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   24-MAR-2009, sequence version 1.
DT   03-AUG-2022, entry version 76.
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=Sca_0433;
OS   Staphylococcus carnosus (strain TM300).
OC   Bacteria; Firmicutes; Bacilli; Bacillales; Staphylococcaceae;
OC   Staphylococcus.
OX   NCBI_TaxID=396513;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=TM300;
RX   PubMed=19060169; DOI=10.1128/aem.01982-08;
RA   Rosenstein R., Nerz C., Biswas L., Resch A., Raddatz G., Schuster S.C.,
RA   Goetz F.;
RT   "Genome analysis of the meat starter culture bacterium Staphylococcus
RT   carnosus TM300.";
RL   Appl. Environ. Microbiol. 75:811-822(2009).
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; AM295250; CAL27347.1; -; Genomic_DNA.
DR   RefSeq; WP_015899691.1; NC_012121.1.
DR   AlphaFoldDB; B9DJK4; -.
DR   SMR; B9DJK4; -.
DR   STRING; 396513.SCA_0433; -.
DR   GeneID; 60545870; -.
DR   KEGG; sca:SCA_0433; -.
DR   eggNOG; COG0691; Bacteria.
DR   HOGENOM; CLU_108953_0_0_9; -.
DR   OMA; WTNHSAR; -.
DR   OrthoDB; 1720952at2; -.
DR   BioCyc; SCAR396513:SCA_RS02205-MON; -.
DR   Proteomes; UP000000444; 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_1000197624"
SQ   SEQUENCE   156 AA;  18166 MW;  29B8C1563B1AD57C CRC64;
     MSKKKKKSPG TLAENRKARH DYNIEDTIEA GIVLRGTEIK SIRRGSANLK DSFAQVKNGE
     IYVHNMHIAP YEEGNRFNHD PLRPRKLLLH KREIEKLGTR TREIGYSIIP LKLYLKHGVC
     KVLIGVARGK KKYDKRQDLK DKAVKRDMQR AMKDRY