SSRP_POLSJ
ID SSRP_POLSJ Reviewed; 149 AA.
AC Q12AT7;
DT 15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT 22-AUG-2006, sequence version 1.
DT 25-MAY-2022, entry version 85.
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=Bpro_2436;
OS Polaromonas sp. (strain JS666 / ATCC BAA-500).
OC Bacteria; Proteobacteria; Betaproteobacteria; Burkholderiales;
OC Comamonadaceae; Polaromonas; unclassified Polaromonas.
OX NCBI_TaxID=296591;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=JS666 / ATCC BAA-500;
RX PubMed=18723656; DOI=10.1128/aem.00197-08;
RA Mattes T.E., Alexander A.K., Richardson P.M., Munk A.C., Han C.S.,
RA Stothard P., Coleman N.V.;
RT "The genome of Polaromonas sp. strain JS666: insights into the evolution of
RT a hydrocarbon- and xenobiotic-degrading bacterium, and features of
RT relevance to biotechnology.";
RL Appl. Environ. Microbiol. 74:6405-6416(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}.
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DR EMBL; CP000316; ABE44355.1; -; Genomic_DNA.
DR AlphaFoldDB; Q12AT7; -.
DR SMR; Q12AT7; -.
DR STRING; 296591.Bpro_2436; -.
DR EnsemblBacteria; ABE44355; ABE44355; Bpro_2436.
DR KEGG; pol:Bpro_2436; -.
DR eggNOG; COG0691; Bacteria.
DR HOGENOM; CLU_108953_3_0_4; -.
DR OMA; WTNHSAR; -.
DR Proteomes; UP000001983; 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..149
FT /note="SsrA-binding protein"
FT /id="PRO_1000002104"
FT REGION 121..149
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 149 AA; 17040 MW; B188087D35F4ACE0 CRC64;
MRIADNKKAI FNYHIEERFE AGMVLEGWEV KSVREGKVQL TDGYVVIRGG ELFIIGCQIN
PLGTASTHVR PDSVRTKKLL MHKDEIRRLV GKVEQKGFTL VPLNMHWKAG KVKCEIGLAK
GKGEHDKRDT IKDREGKREV ERAMKSRSR
