SSRP_SACD2
ID SSRP_SACD2 Reviewed; 159 AA.
AC Q21H28;
DT 29-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT 29-APR-2008, sequence version 2.
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=Sde_2741;
OS Saccharophagus degradans (strain 2-40 / ATCC 43961 / DSM 17024).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Cellvibrionales;
OC Cellvibrionaceae; Saccharophagus.
OX NCBI_TaxID=203122;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=2-40 / ATCC 43961 / DSM 17024;
RX PubMed=18516288; DOI=10.1371/journal.pgen.1000087;
RA Weiner R.M., Taylor L.E. II, Henrissat B., Hauser L., Land M.,
RA Coutinho P.M., Rancurel C., Saunders E.H., Longmire A.G., Zhang H.,
RA Bayer E.A., Gilbert H.J., Larimer F., Zhulin I.B., Ekborg N.A., Lamed R.,
RA Richardson P.M., Borovok I., Hutcheson S.;
RT "Complete genome sequence of the complex carbohydrate-degrading marine
RT bacterium, Saccharophagus degradans strain 2-40 T.";
RL PLoS Genet. 4:E1000087-E1000087(2008).
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}.
CC -!- SEQUENCE CAUTION:
CC Sequence=ABD82001.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};
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DR EMBL; CP000282; ABD82001.1; ALT_INIT; Genomic_DNA.
DR RefSeq; WP_041325803.1; NC_007912.1.
DR AlphaFoldDB; Q21H28; -.
DR SMR; Q21H28; -.
DR STRING; 203122.Sde_2741; -.
DR EnsemblBacteria; ABD82001; ABD82001; Sde_2741.
DR KEGG; sde:Sde_2741; -.
DR eggNOG; COG0691; Bacteria.
DR HOGENOM; CLU_108953_3_0_6; -.
DR OrthoDB; 1720952at2; -.
DR Proteomes; UP000001947; 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; Reference proteome; RNA-binding.
FT CHAIN 1..159
FT /note="SsrA-binding protein"
FT /id="PRO_0000331092"
SQ SEQUENCE 159 AA; 18461 MW; CFFAA162E9A36D0A CRC64;
MSKANKKKKP QSSTIAQNKR ARHDYFLETK FEAGVALLGW EVKALRAQRG QMTESYVLVQ
NGEAWLQGAQ IQPLPQACTH YVTEPARPRK LLLNRRELNK IAEAKDQKGY TIVATSLYWK
AHMVKCEIAI AKGKQLHDKR QTEKEREWNI QKQRVLYDK
