SSB1_ZYGRC
ID SSB1_ZYGRC Reviewed; 613 AA.
AC Q707X3; C5DTQ5;
DT 27-SEP-2004, integrated into UniProtKB/Swiss-Prot.
DT 23-JAN-2007, sequence version 3.
DT 03-AUG-2022, entry version 93.
DE RecName: Full=Ribosome-associated molecular chaperone SSB1;
DE EC=3.6.4.10;
DE AltName: Full=Heat shock protein SSB1;
DE AltName: Full=Hsp70 chaperone Ssb;
GN Name=SSB1; OrderedLocusNames=ZYRO0C10450g;
OS Zygosaccharomyces rouxii (strain ATCC 2623 / CBS 732 / NBRC 1130 / NCYC 568
OS / NRRL Y-229) (Candida mogii).
OC Eukaryota; Fungi; Dikarya; Ascomycota; Saccharomycotina; Saccharomycetes;
OC Saccharomycetales; Saccharomycetaceae; Zygosaccharomyces.
OX NCBI_TaxID=559307;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=14745027; DOI=10.1073/pnas.0304170101;
RA Butler G., Kenny C., Fagan A., Kurischko C., Gaillardin C., Wolfe K.H.;
RT "Evolution of the MAT locus and its Ho endonuclease in yeast species.";
RL Proc. Natl. Acad. Sci. U.S.A. 101:1632-1637(2004).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 2623 / CBS 732 / BCRC 21506 / NBRC 1130 / NCYC 568 / NRRL
RC Y-229;
RX PubMed=19525356; DOI=10.1101/gr.091546.109;
RG The Genolevures Consortium;
RA Souciet J.-L., Dujon B., Gaillardin C., Johnston M., Baret P.V.,
RA Cliften P., Sherman D.J., Weissenbach J., Westhof E., Wincker P., Jubin C.,
RA Poulain J., Barbe V., Segurens B., Artiguenave F., Anthouard V.,
RA Vacherie B., Val M.-E., Fulton R.S., Minx P., Wilson R., Durrens P.,
RA Jean G., Marck C., Martin T., Nikolski M., Rolland T., Seret M.-L.,
RA Casaregola S., Despons L., Fairhead C., Fischer G., Lafontaine I., Leh V.,
RA Lemaire M., de Montigny J., Neuveglise C., Thierry A., Blanc-Lenfle I.,
RA Bleykasten C., Diffels J., Fritsch E., Frangeul L., Goeffon A.,
RA Jauniaux N., Kachouri-Lafond R., Payen C., Potier S., Pribylova L.,
RA Ozanne C., Richard G.-F., Sacerdot C., Straub M.-L., Talla E.;
RT "Comparative genomics of protoploid Saccharomycetaceae.";
RL Genome Res. 19:1696-1709(2009).
CC -!- FUNCTION: Ribosome-bound, Hsp70-type chaperone that assists in the
CC cotranslational folding of newly synthesized proteins in the cytosol.
CC Stimulates folding by interacting with nascent chains, binding to
CC short, largely hydrophobic sequences exposed by unfolded proteins,
CC thereby stabilizing longer, more slowly translated, and aggregation-
CC prone nascent polypeptides and domains that cannot fold stably until
CC fully synthesized. The Hsp70-protein substrate interaction depends on
CC ATP-binding and on allosteric regulation between the NBD and the SBD.
CC The ATP-bound state is characterized by a fast exchange rate of
CC substrate (low affinity state), while in the ADP-bound state exchange
CC is much slower (high affinity state). During the Hsp70 cycle, the
CC chaperone switches between the ATP-bound state (open conformation) and
CC the ADP-bound state (closed conformation) by major conformational
CC rearrangements involving mainly the lid domain. Ssb cooperates with a
CC specific Hsp40/Hsp70 co-chaperone termed the ribosome-associated
CC complex (RAC), which stimulates the ATPase activity of the ribosome-
CC associated pool of Ssbs and switches it to the high affinity substrate
CC binding state. Hsp110 chaperone SSE1 and FES1 act as nucleotide
CC exchange factors that cause substrate release.
CC {ECO:0000250|UniProtKB:P11484}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=ATP + H2O = ADP + H(+) + phosphate; Xref=Rhea:RHEA:13065,
CC ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:30616,
CC ChEBI:CHEBI:43474, ChEBI:CHEBI:456216; EC=3.6.4.10;
CC Evidence={ECO:0000250|UniProtKB:P11484};
CC -!- SUBUNIT: Binds to ribosomes. Binds close to the ribosomal tunnel exit
CC via contacts with both ribosomal proteins and rRNA. Directly interacts
CC with nascent polypeptides. This interaction is dependent on the
CC ribosome-associated complex (RAC). Interacts with SSE1. Interacts with
CC FES1. {ECO:0000250|UniProtKB:P11484}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250|UniProtKB:P11484}.
CC Note=Associated with translating ribosomes.
CC {ECO:0000250|UniProtKB:P11484}.
CC -!- SIMILARITY: Belongs to the heat shock protein 70 family. Ssb-type Hsp70
CC subfamily. {ECO:0000305}.
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DR EMBL; AJ617309; CAE84432.1; -; Genomic_DNA.
DR EMBL; CU928175; CAR27166.1; -; Genomic_DNA.
DR RefSeq; XP_002496099.1; XM_002496054.1.
DR AlphaFoldDB; Q707X3; -.
DR SMR; Q707X3; -.
DR STRING; 559307.Q707X3; -.
DR PRIDE; Q707X3; -.
DR EnsemblFungi; CAR27166; CAR27166; ZYRO0C10450g.
DR GeneID; 8203314; -.
DR KEGG; zro:ZYRO0C10450g; -.
DR HOGENOM; CLU_005965_0_1_1; -.
DR InParanoid; Q707X3; -.
DR Proteomes; UP000008536; Chromosome C.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR GO; GO:0016887; F:ATP hydrolysis activity; IEA:RHEA.
DR GO; GO:0140662; F:ATP-dependent protein folding chaperone; IEA:InterPro.
DR GO; GO:0006412; P:translation; IEA:UniProtKB-KW.
DR Gene3D; 1.20.1270.10; -; 1.
DR Gene3D; 2.60.34.10; -; 1.
DR InterPro; IPR043129; ATPase_NBD.
DR InterPro; IPR018181; Heat_shock_70_CS.
DR InterPro; IPR029048; HSP70_C_sf.
DR InterPro; IPR029047; HSP70_peptide-bd_sf.
DR InterPro; IPR013126; Hsp_70_fam.
DR PANTHER; PTHR19375; PTHR19375; 1.
DR Pfam; PF00012; HSP70; 1.
DR SUPFAM; SSF100920; SSF100920; 1.
DR SUPFAM; SSF100934; SSF100934; 1.
DR SUPFAM; SSF53067; SSF53067; 2.
DR PROSITE; PS00297; HSP70_1; 1.
DR PROSITE; PS00329; HSP70_2; 1.
DR PROSITE; PS01036; HSP70_3; 1.
PE 3: Inferred from homology;
KW ATP-binding; Chaperone; Cytoplasm; Hydrolase; Nucleotide-binding;
KW Protein biosynthesis; Reference proteome.
FT CHAIN 1..613
FT /note="Ribosome-associated molecular chaperone SSB1"
FT /id="PRO_0000078398"
FT REGION 1..391
FT /note="Nucleotide binding domain (NBD)"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
FT REGION 392..402
FT /note="Inter-domain linker"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
FT REGION 403..613
FT /note="Substrate binding domain (SBD)"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
FT REGION 516..612
FT /note="Lid domain (SBDalpha)"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
FT MOTIF 574..582
FT /note="Nuclear export signal"
FT /evidence="ECO:0000250|UniProtKB:P11484"
FT BINDING 16..18
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
FT BINDING 73
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
FT BINDING 205..207
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
FT BINDING 271..278
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
FT BINDING 342
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000250|UniProtKB:G0SCU5"
SQ SEQUENCE 613 AA; 66730 MW; EDC4D0418B3F740E CRC64;
MAEGVFQGAI GIDLGTTYSC VATYESSVEI IANEQGNRVT PSFVAFTPEE RLIGDAAKNQ
AALNPENTVF DAKRLIGRRF DDESVQKDRK TWPFKLIDVE GNPVVEVQYL GETKTFSPQE
ISSMVLTKMK EIAEAKIGQK VEKAVITVPA YFNDAQRQAT KDAGSISGLN VLRIINEPTA
AAIAYGLGAG KSEKERHVLI FDLGGGTFDV SLLHIAGGVY TVKSTSGNTH LGGQDFDTNM
LEHFKNEFKK KTGNDISGDA RALRRLRTAC ERAKRTLSSV TQTTIEVDSL YNGDDFETSI
TRARFEDLNS SLFKSTLEPV EQVLKDAKVP KTEIDEVVLV GGSTRIPKVQ KMLSDFFEGK
QLEKSINPDE AVAYGAAVQG AILTGQSTSE DTKDLLLLDV APLSLGVGMQ GDIFGIVVPR
NTTVPTIKRR TFTTVADHQS TVQFPVYQGE RVNCKENTLL GEFDLKNIPP MQAGEPVLEA
IFEVDANGIL KVTAVEKSTG KSANITISNA VGRLSSDEIE KMVNQAEEFK AADEAFAKKH
EARQRLESYV ASIEQQVTDP VLSSKLKRGS KTKIESALSD ALASLEIQDA STDDLRKAEV
GLKRVVTKAM SSR
