SSRP_RHOPT
ID SSRP_RHOPT Reviewed; 157 AA.
AC B3QJG5;
DT 24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT 02-SEP-2008, sequence version 1.
DT 03-AUG-2022, entry version 79.
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=Rpal_2963;
OS Rhodopseudomonas palustris (strain TIE-1).
OC Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC Bradyrhizobiaceae; Rhodopseudomonas.
OX NCBI_TaxID=395960;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=TIE-1;
RG US DOE Joint Genome Institute;
RA Lucas S., Copeland A., Lapidus A., Glavina del Rio T., Dalin E., Tice H.,
RA Pitluck S., Chain P., Malfatti S., Shin M., Vergez L., Lang D., Schmutz J.,
RA Larimer F., Land M., Hauser L., Kyrpides N., Mikhailova N., Emerson D.,
RA Newman D.K., Roden E., Richardson P.;
RT "Complete sequence of Rhodopseudomonas palustris TIE-1.";
RL Submitted (MAY-2008) 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; CP001096; ACF01471.1; -; Genomic_DNA.
DR RefSeq; WP_011158238.1; NC_011004.1.
DR AlphaFoldDB; B3QJG5; -.
DR SMR; B3QJG5; -.
DR PRIDE; B3QJG5; -.
DR EnsemblBacteria; ACF01471; ACF01471; Rpal_2963.
DR GeneID; 66893763; -.
DR KEGG; rpt:Rpal_2963; -.
DR HOGENOM; CLU_108953_0_1_5; -.
DR OMA; WTNHSAR; -.
DR OrthoDB; 1720952at2; -.
DR BioCyc; RPAL395960:RPAL_RS14695-MON; -.
DR Proteomes; UP000001725; 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 PANTHER; PTHR30308; PTHR30308; 1.
DR Pfam; PF01668; SmpB; 1.
DR SUPFAM; SSF74982; SSF74982; 1.
DR TIGRFAMs; TIGR00086; smpB; 1.
PE 3: Inferred from homology;
KW Cytoplasm; RNA-binding.
FT CHAIN 1..157
FT /note="SsrA-binding protein"
FT /id="PRO_1000090178"
FT REGION 132..157
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 132..152
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 157 AA; 18147 MW; 4F6A5C126855C305 CRC64;
MAEKNERAIK VVAENRKARF NYAIDDTIEV GIALTGTEVK SIRNGKTTIA ESYADARGSE
IWLINANIPE YLQANRFNHE PKRPRKLLLH RKQINKLIGA VEREGMTLIP LKLYFNERGR
AKLQLALAKG KKLHDKRETE KKRDWSREKG RLLRSRG
