ID   SSRP_ACIBC              Reviewed;         158 AA.
AC   B2HUN4;
DT   24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT   10-JUN-2008, sequence version 1.
DT   25-MAY-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=ACICU_00797;
OS   Acinetobacter baumannii (strain ACICU).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Moraxellales; Moraxellaceae;
OC   Acinetobacter; Acinetobacter calcoaceticus/baumannii complex.
OX   NCBI_TaxID=405416;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ACICU;
RX   PubMed=18411315; DOI=10.1128/aac.01643-07;
RA   Iacono M., Villa L., Fortini D., Bordoni R., Imperi F., Bonnal R.J.,
RA   Sicheritz-Ponten T., De Bellis G., Visca P., Cassone A., Carattoli A.;
RT   "Whole-genome pyrosequencing of an epidemic multidrug-resistant
RT   Acinetobacter baumannii strain belonging to the European clone II group.";
RL   Antimicrob. Agents Chemother. 52:2616-2625(2008).
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; CP000863; ACC56109.1; -; Genomic_DNA.
DR   RefSeq; WP_001029798.1; NZ_CP031380.1.
DR   AlphaFoldDB; B2HUN4; -.
DR   SMR; B2HUN4; -.
DR   GeneID; 60876940; -.
DR   GeneID; 66398214; -.
DR   KEGG; abc:ACICU_00797; -.
DR   HOGENOM; CLU_108953_3_0_6; -.
DR   OMA; WTNHSAR; -.
DR   Proteomes; UP000008839; 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..158
FT                   /note="SsrA-binding protein"
FT                   /id="PRO_1000090129"
SQ   SEQUENCE   158 AA;  18080 MW;  32467D08C9E0A5DD CRC64;
     MAKATVVKKH NGGTIAQNKR ARHDYFIEEK FEAGMSLLGW EVKSLRAGRM SLTESYVIFK
     NGEAFLFGAQ IQPLLSASTH IVPEATRTRK LLLSRRELEK LMGAVNQKGY SCVPLACYWK
     GHLVKLEIAL VKGKQLHDKR ATEKERDWQR DKARIFHK