SSRP_STRP6
ID SSRP_STRP6 Reviewed; 155 AA.
AC Q5XDD6;
DT 15-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT 23-NOV-2004, sequence version 1.
DT 25-MAY-2022, entry version 94.
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=M6_Spy0442;
OS Streptococcus pyogenes serotype M6 (strain ATCC BAA-946 / MGAS10394).
OC Bacteria; Firmicutes; Bacilli; Lactobacillales; Streptococcaceae;
OC Streptococcus.
OX NCBI_TaxID=286636;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC BAA-946 / MGAS10394;
RX PubMed=15272401; DOI=10.1086/422697;
RA Banks D.J., Porcella S.F., Barbian K.D., Beres S.B., Philips L.E.,
RA Voyich J.M., DeLeo F.R., Martin J.M., Somerville G.A., Musser J.M.;
RT "Progress toward characterization of the group A Streptococcus metagenome:
RT complete genome sequence of a macrolide-resistant serotype M6 strain.";
RL J. Infect. Dis. 190:727-738(2004).
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; CP000003; AAT86577.1; -; Genomic_DNA.
DR RefSeq; WP_002994152.1; NC_006086.1.
DR AlphaFoldDB; Q5XDD6; -.
DR SMR; Q5XDD6; -.
DR EnsemblBacteria; AAT86577; AAT86577; M6_Spy0442.
DR GeneID; 57852242; -.
DR KEGG; spa:M6_Spy0442; -.
DR HOGENOM; CLU_108953_0_0_9; -.
DR OMA; WTNHSAR; -.
DR Proteomes; UP000001167; 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..155
FT /note="SsrA-binding protein"
FT /id="PRO_0000103045"
FT REGION 135..155
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 155 AA; 17730 MW; 20B66C0349882BB9 CRC64;
MAKGEGHILA QNKKARHDYH IVETVEAGIV LTGTEIKSVR AARIQLKDGF AQIKNGEAWL
VNVHIAPFEQ GNIWNADPER TRKLLLKKRE ITHLANELKG SGMTLVPLKV YLKDGFAKVL
IGLAKGKHEY DKRETIKRRD QERDIKKQMK HYNAR
