SSRP_CHLAB
ID SSRP_CHLAB Reviewed; 150 AA.
AC Q5L646;
DT 15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT 21-JUN-2005, sequence version 1.
DT 03-AUG-2022, entry version 88.
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=CAB432;
OS Chlamydia abortus (strain DSM 27085 / S26/3) (Chlamydophila abortus).
OC Bacteria; Chlamydiae; Chlamydiales; Chlamydiaceae;
OC Chlamydia/Chlamydophila group; Chlamydia.
OX NCBI_TaxID=218497;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=DSM 27085 / S26/3;
RX PubMed=15837807; DOI=10.1101/gr.3684805;
RA Thomson N.R., Yeats C., Bell K., Holden M.T.G., Bentley S.D.,
RA Livingstone M., Cerdeno-Tarraga A.-M., Harris B., Doggett J., Ormond D.,
RA Mungall K., Clarke K., Feltwell T., Hance Z., Sanders M., Quail M.A.,
RA Price C., Barrell B.G., Parkhill J., Longbottom D.;
RT "The Chlamydophila abortus genome sequence reveals an array of variable
RT proteins that contribute to interspecies variation.";
RL Genome Res. 15:629-640(2005).
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; CR848038; CAH63885.1; -; Genomic_DNA.
DR RefSeq; WP_011097067.1; NC_004552.2.
DR AlphaFoldDB; Q5L646; -.
DR SMR; Q5L646; -.
DR EnsemblBacteria; CAH63885; CAH63885; CAB432.
DR KEGG; cab:CAB432; -.
DR eggNOG; COG0691; Bacteria.
DR HOGENOM; CLU_108953_0_1_0; -.
DR OMA; WTNHSAR; -.
DR OrthoDB; 1720952at2; -.
DR Proteomes; UP000001012; 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_1000002027"
SQ SEQUENCE 150 AA; 17161 MW; 3C90384382E1D907 CRC64;
MASKEIVSNR KALHNYEVLE SLEAGIVLTG TEIKSLRDHG GNLGDAYVAI SKGEAWLLNA
SIAPYRFGNI YNHEERRKRK LLLHRYEIHK LEVKVAQKGV TIIPLGMFLS RGYVKVRLGC
CRGKKSHDKR QTIIAREKER EIASAMKRYR
