ID   SSRP_PSECP              Reviewed;         158 AA.
AC   B8HBH4;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   03-MAR-2009, sequence version 1.
DT   25-MAY-2022, entry version 81.
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=Achl_2397;
OS   Pseudarthrobacter chlorophenolicus (strain ATCC 700700 / DSM 12829 / CIP
OS   107037 / JCM 12360 / KCTC 9906 / NCIMB 13794 / A6) (Arthrobacter
OS   chlorophenolicus).
OC   Bacteria; Actinobacteria; Micrococcales; Micrococcaceae; Pseudarthrobacter.
OX   NCBI_TaxID=452863;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700700 / DSM 12829 / CIP 107037 / JCM 12360 / KCTC 9906 / NCIMB
RC   13794 / A6;
RG   US DOE Joint Genome Institute;
RA   Lucas S., Copeland A., Lapidus A., Glavina del Rio T., Tice H., Bruce D.,
RA   Goodwin L., Pitluck S., Goltsman E., Clum A., Larimer F., Land M.,
RA   Hauser L., Kyrpides N., Mikhailova N., Jansson J., Richardson P.;
RT   "Complete sequence of chromosome of Arthrobacter chlorophenolicus A6.";
RL   Submitted (JAN-2009) 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; CP001341; ACL40362.1; -; Genomic_DNA.
DR   RefSeq; WP_015937574.1; NC_011886.1.
DR   AlphaFoldDB; B8HBH4; -.
DR   SMR; B8HBH4; -.
DR   STRING; 452863.Achl_2397; -.
DR   PRIDE; B8HBH4; -.
DR   EnsemblBacteria; ACL40362; ACL40362; Achl_2397.
DR   KEGG; ach:Achl_2397; -.
DR   eggNOG; COG0691; Bacteria.
DR   HOGENOM; CLU_108953_2_1_11; -.
DR   OMA; WTNHSAR; -.
DR   OrthoDB; 1720952at2; -.
DR   Proteomes; UP000002505; 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_1000197603"
FT   REGION          133..158
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        133..152
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   158 AA;  18670 MW;  84AEA4E95C65D51D CRC64;
     MPKESGRKVV ATNRKARHDY HVLDTYEAGI ALMGTEVKSL REGHASMVDG FCTFYNDELW
     MEAIHIPEYN QGSWTNHAAR RRRKLLLHRE ELIKISRKVQ EAGYTIVPLQ LYFVDGRAKV
     EIGVARGKRE YDKRQTLREQ QDNREAQREM RERNRRRG