SSRP_CHLPD
ID SSRP_CHLPD Reviewed; 157 AA.
AC A1BEN9;
DT 15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT 23-JAN-2007, sequence version 1.
DT 25-MAY-2022, entry version 83.
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=Cpha266_0815;
OS Chlorobium phaeobacteroides (strain DSM 266).
OC Bacteria; Chlorobi; Chlorobia; Chlorobiales; Chlorobiaceae;
OC Chlorobium/Pelodictyon group; Chlorobium.
OX NCBI_TaxID=290317;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=DSM 266;
RG US DOE Joint Genome Institute;
RA Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C.,
RA Glavina del Rio T., Hammon N., Israni S., Pitluck S., Goltsman E.,
RA Schmutz J., Larimer F., Land M., Hauser L., Mikhailova N., Li T.,
RA Overmann J., Bryant D.A., Richardson P.;
RT "Complete sequence of Chlorobium phaeobacteroides DSM 266.";
RL Submitted (DEC-2006) to the EMBL/GenBank/DDBJ databases.
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; CP000492; ABL64866.1; -; Genomic_DNA.
DR RefSeq; WP_011744694.1; NC_008639.1.
DR AlphaFoldDB; A1BEN9; -.
DR SMR; A1BEN9; -.
DR STRING; 290317.Cpha266_0815; -.
DR EnsemblBacteria; ABL64866; ABL64866; Cpha266_0815.
DR KEGG; cph:Cpha266_0815; -.
DR eggNOG; COG0691; Bacteria.
DR HOGENOM; CLU_108953_0_1_10; -.
DR OMA; WTNHSAR; -.
DR OrthoDB; 1720952at2; -.
DR Proteomes; UP000008701; 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..157
FT /note="SsrA-binding protein"
FT /id="PRO_1000002029"
SQ SEQUENCE 157 AA; 18380 MW; 0127DDDB68484F34 CRC64;
MSKKQQPQTF VQAIHNRKAR FEFHILETMV AGIELLGSEV KSVRQGKASL NESYAMIHHG
EVWLENMQIT PYEHNHLDTL EAKRSRKLLL NREEIRKLET KINEKGLTLV PLKAFFNNRG
ILKIEIALAK GKKLYDKRET IKSRDAERQL QQLKKTY
