SSRP_TROW8
ID SSRP_TROW8 Reviewed; 211 AA.
AC Q83NF6;
DT 15-DEC-2003, integrated into UniProtKB/Swiss-Prot.
DT 01-JUN-2003, sequence version 1.
DT 25-MAY-2022, entry version 97.
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=TW571;
OS Tropheryma whipplei (strain TW08/27) (Whipple's bacillus).
OC Bacteria; Actinobacteria; Micrococcales; Tropherymataceae; Tropheryma.
OX NCBI_TaxID=218496;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=TW08/27;
RX PubMed=12606174; DOI=10.1016/s0140-6736(03)12597-4;
RA Bentley S.D., Maiwald M., Murphy L.D., Pallen M.J., Yeats C.A., Dover L.G.,
RA Norbertczak H.T., Besra G.S., Quail M.A., Harris D.E., von Herbay A.,
RA Goble A., Rutter S., Squares R., Squares S., Barrell B.G., Parkhill J.,
RA Relman D.A.;
RT "Sequencing and analysis of the genome of the Whipple's disease bacterium
RT Tropheryma whipplei.";
RL Lancet 361:637-644(2003).
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; BX251412; CAD67237.1; -; Genomic_DNA.
DR RefSeq; WP_011096517.1; NC_004551.1.
DR AlphaFoldDB; Q83NF6; -.
DR SMR; Q83NF6; -.
DR GeneID; 67388352; -.
DR KEGG; tws:TW571; -.
DR HOGENOM; CLU_108953_2_0_11; -.
DR OMA; WTNHSAR; -.
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..211
FT /note="SsrA-binding protein"
FT /id="PRO_0000103060"
FT REGION 1..20
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 170..211
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 192..211
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 211 AA; 24747 MW; A5871AFE3BA34E2C CRC64;
MHRRSSKSYS SRNSKTPERS KIPDCVIASN KSAEYNYFLD KTFEAGLVLL GSEVKSVRQQ
KISLSEAYIY EDNSEIWLAN LYIPEHKTGG WTNHNPRRLR KLLLHKYQIA RLRKDLLIPG
ITLVPIKFYF RNGRAKLLIS LARGKKLIDK REVIKEREAT LEANRALKHR LRRPRAQRNT
QRSVTPRSTR ENKNVQRNKA RSARCNVRHE N