ID   SSRP_ENTHA              Reviewed;         154 AA.
AC   P43659; I6SDB9;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   30-MAY-2000, sequence version 2.
DT   25-MAY-2022, entry version 104.
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=EHR_08465;
OS   Enterococcus hirae (strain ATCC 9790 / DSM 20160 / JCM 8729 / LMG 6399 /
OS   NBRC 3181 / NCIMB 6459 / NCDO 1258 / NCTC 12367 / WDCM 00089 / R).
OC   Bacteria; Firmicutes; Bacilli; Lactobacillales; Enterococcaceae;
OC   Enterococcus.
OX   NCBI_TaxID=768486;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=ATCC 9790 / DSM 20160 / JCM 8729 / LMG 6399 / NBRC 3181 / NCIMB 6459
RC   / NCDO 1258 / NCTC 12367 / WDCM 00089 / R;
RX   PubMed=1328152; DOI=10.1128/jb.174.19.6117-6124.1992;
RA   Shibata C., Ehara T., Tomura K., Igarashi K., Kobayashi H.;
RT   "Gene structure of Enterococcus hirae (Streptococcus faecalis) F1F0-ATPase,
RT   which functions as a regulator of cytoplasmic pH.";
RL   J. Bacteriol. 174:6117-6124(1992).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 9790 / DSM 20160 / JCM 8729 / LMG 6399 / NBRC 3181 / NCIMB 6459
RC   / NCDO 1258 / NCTC 12367 / WDCM 00089 / R;
RX   PubMed=22933757; DOI=10.1128/jb.01075-12;
RA   Gaechter T., Wunderlin C., Schmidheini T., Solioz M.;
RT   "Genome sequence of Enterococcus hirae (Streptococcus faecalis) ATCC 9790,
RT   a model organism for the study of ion transport, bioenergetics, and copper
RT   homeostasis.";
RL   J. Bacteriol. 194:5126-5127(2012).
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}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAA26852.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; M90060; AAA26852.1; ALT_INIT; Genomic_DNA.
DR   EMBL; CP003504; AFM70618.1; -; Genomic_DNA.
DR   PIR; A43259; A43259.
DR   RefSeq; WP_010718601.1; NZ_ASVZ01000001.1.
DR   AlphaFoldDB; P43659; -.
DR   SMR; P43659; -.
DR   STRING; 768486.EHR_08465; -.
DR   EnsemblBacteria; AFM70618; AFM70618; EHR_08465.
DR   KEGG; ehr:EHR_08465; -.
DR   eggNOG; COG0691; Bacteria.
DR   HOGENOM; CLU_108953_0_0_9; -.
DR   OrthoDB; 1720952at2; -.
DR   Proteomes; UP000002895; 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..154
FT                   /note="SsrA-binding protein"
FT                   /id="PRO_0000102948"
SQ   SEQUENCE   154 AA;  17784 MW;  35E85BEBA3494868 CRC64;
     MPKGDGKLIA QNKKARHDYS IIDTMEAGMV LQGTEIKSIR NSRINLKDGF VRIRNGEAFL
     HNVHISPYEQ GNIFNHDPLR TRKLLLHKKQ ISRLETETKN TGVTIVPLKV YIRDGYAKVL
     IGLAKGKKSY DKREDLKRKD VDRQIDRTLK NFSR