ID   SSRP_RICM5              Reviewed;         152 AA.
AC   A8F1K4;
DT   29-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT   29-APR-2008, sequence version 2.
DT   25-MAY-2022, entry version 66.
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=RMA_0611;
OS   Rickettsia massiliae (strain Mtu5).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rickettsiales;
OC   Rickettsiaceae; Rickettsieae; Rickettsia; spotted fever group.
OX   NCBI_TaxID=416276;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Mtu5;
RX   PubMed=17916642; DOI=10.1101/gr.6742107;
RA   Blanc G., Ogata H., Robert C., Audic S., Claverie J.-M., Raoult D.;
RT   "Lateral gene transfer between obligate intracellular bacteria: evidence
RT   from the Rickettsia massiliae genome.";
RL   Genome Res. 17:1657-1664(2007).
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=ABV84790.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; CP000683; ABV84790.1; ALT_INIT; Genomic_DNA.
DR   RefSeq; WP_014365853.1; NC_009900.1.
DR   AlphaFoldDB; A8F1K4; -.
DR   SMR; A8F1K4; -.
DR   EnsemblBacteria; ABV84790; ABV84790; RMA_0611.
DR   KEGG; rms:RMA_0611; -.
DR   HOGENOM; CLU_108953_0_1_5; -.
DR   Proteomes; UP000001311; 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..152
FT                   /note="SsrA-binding protein"
FT                   /id="PRO_0000331089"
SQ   SEQUENCE   152 AA;  17882 MW;  62BC4769CB08FBA0 CRC64;
     MTEYKKVIAQ NKKALFNYFI EERLEAGIVL KGSEVQSLRQ GKASIEESHA TDTGHEVFLY
     NCHIAEYEKA NRFNHATRRP RKLLLHTKEI KKIIGRIRIK GYTLVALSMY FNKKNKVKVE
     LGIAKGKKLH DKRESIQEKD WKRDQSRLIR QK