ID   SSRP_BORAP              Reviewed;         150 AA.
AC   Q0SPD1; G0IQ63;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   05-SEP-2006, sequence version 1.
DT   25-MAY-2022, entry version 91.
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};
GN   OrderedLocusNames=BAPKO_0032, BafPKo_0033;
OS   Borreliella afzelii (strain PKo) (Borrelia afzelii).
OC   Bacteria; Spirochaetes; Spirochaetales; Borreliaceae; Borreliella.
OX   NCBI_TaxID=390236;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PKo;
RX   PubMed=16914037; DOI=10.1186/1471-2164-7-211;
RA   Gloeckner G., Schulte-Spechtel U., Schilhabel M., Felder M., Suehnel J.,
RA   Wilske B., Platzer M.;
RT   "Comparative genome analysis: selection pressure on the Borrelia vls
RT   cassettes is essential for infectivity.";
RL   BMC Genomics 7:211-211(2006).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PKo;
RX   PubMed=22123755; DOI=10.1128/jb.05951-11;
RA   Casjens S.R., Mongodin E.F., Qiu W.G., Dunn J.J., Luft B.J.,
RA   Fraser-Liggett C.M., Schutzer S.E.;
RT   "Whole-genome sequences of two Borrelia afzelii and two Borrelia garinii
RT   Lyme disease agent isolates.";
RL   J. Bacteriol. 193:6995-6996(2011).
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; CP000395; ABH01297.1; -; Genomic_DNA.
DR   EMBL; CP002933; AEL69267.1; -; Genomic_DNA.
DR   RefSeq; WP_004790217.1; NC_017238.1.
DR   AlphaFoldDB; Q0SPD1; -.
DR   SMR; Q0SPD1; -.
DR   STRING; 390236.BafPKo_0033; -.
DR   EnsemblBacteria; AEL69267; AEL69267; BafPKo_0033.
DR   KEGG; baf:BAPKO_0032; -.
DR   KEGG; bafz:BafPKo_0033; -.
DR   PATRIC; fig|390236.22.peg.33; -.
DR   eggNOG; COG0691; Bacteria.
DR   HOGENOM; CLU_108953_0_0_12; -.
DR   OMA; WTNHSAR; -.
DR   OrthoDB; 1720952at2; -.
DR   Proteomes; UP000005216; 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..150
FT                   /note="SsrA-binding protein"
FT                   /id="PRO_1000002004"
SQ   SEQUENCE   150 AA;  17810 MW;  C55DD96BE6F6AFE2 CRC64;
     MNTNTLLIEN KKAKFNYFIE EKISCGIVLK GTEVKSIKAK KLSFNNSFAI IKKEELWLEN
     LHVSKYKEGN IFNHDELRPR KLLIKKKELQ RLKKFKEKEG YTLIPISFYL KKSIIKVEVG
     ICKGKKLYDK REILKQKSIK KDLSREIKYK