SSRP_AZOC5
ID SSRP_AZOC5 Reviewed; 160 AA.
AC A8I0D5;
DT 29-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT 04-DEC-2007, sequence version 1.
DT 25-MAY-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=AZC_1244;
OS Azorhizobium caulinodans (strain ATCC 43989 / DSM 5975 / JCM 20966 / LMG
OS 6465 / NBRC 14845 / NCIMB 13405 / ORS 571).
OC Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC Xanthobacteraceae; Azorhizobium.
OX NCBI_TaxID=438753;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 43989 / DSM 5975 / JCM 20966 / LMG 6465 / NBRC 14845 / NCIMB
RC 13405 / ORS 571;
RA Lee K.B., Backer P.D., Aono T., Liu C.T., Suzuki S., Suzuki T., Kaneko T.,
RA Yamada M., Tabata S., Kupfer D.M., Najar F.Z., Wiley G.B., Roe B.,
RA Binnewies T., Ussery D., Vereecke D., Gevers D., Holsters M., Oyaizu H.;
RT "Complete genome sequence of the nitrogen-fixing bacterium Azorhizobium
RT caulinodans ORS571.";
RL Submitted (APR-2007) 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; AP009384; BAF87242.1; -; Genomic_DNA.
DR AlphaFoldDB; A8I0D5; -.
DR SMR; A8I0D5; -.
DR STRING; 438753.AZC_1244; -.
DR EnsemblBacteria; BAF87242; BAF87242; AZC_1244.
DR KEGG; azc:AZC_1244; -.
DR eggNOG; COG0691; Bacteria.
DR HOGENOM; CLU_108953_0_1_5; -.
DR OMA; WTNHSAR; -.
DR Proteomes; UP000000270; 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..160
FT /note="SsrA-binding protein"
FT /id="PRO_0000331024"
FT REGION 134..160
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 160 AA; 18657 MW; 47FC25E80EABDCAE CRC64;
MMAEKKKKEL PRKVVADNRR ARFDYDIGEV FEAGIALKGT EVKALRTGKA TIHESYAGGK
NGELWLFNSY VPEYLEANRF NHEPRRPRKL LMHKRQIHKL TVAVEREGMT VVPLKIYFNE
QGRAKVEVAL AKGRKAHDKR EAVKERDWNR DKARLMRDRG
