SBI_STAA8
ID SBI_STAA8 Reviewed; 436 AA.
AC Q2FVK5; O52187; Q9R5V4;
DT 10-FEB-2009, integrated into UniProtKB/Swiss-Prot.
DT 21-MAR-2006, sequence version 1.
DT 25-MAY-2022, entry version 90.
DE RecName: Full=Immunoglobulin-binding protein Sbi;
DE Flags: Precursor;
GN Name=sbi; OrderedLocusNames=SAOUHSC_02706;
OS Staphylococcus aureus (strain NCTC 8325 / PS 47).
OC Bacteria; Firmicutes; Bacilli; Bacillales; Staphylococcaceae;
OC Staphylococcus.
OX NCBI_TaxID=93061;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND INTERACTION WITH IMMUNOGLOBULIN G.
RX PubMed=9579072; DOI=10.1099/00221287-144-4-985;
RA Zhang L., Jacobsson K., Vasi J., Lindberg M., Frykberg L.;
RT "A second IgG-binding protein in Staphylococcus aureus.";
RL Microbiology 144:985-991(1998).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=NCTC 8325 / PS 47;
RA Gillaspy A.F., Worrell V., Orvis J., Roe B.A., Dyer D.W., Iandolo J.J.;
RT "The Staphylococcus aureus NCTC 8325 genome.";
RL (In) Fischetti V., Novick R., Ferretti J., Portnoy D., Rood J. (eds.);
RL Gram positive pathogens, 2nd edition, pp.381-412, ASM Press, Washington
RL D.C. (2006).
RN [3]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 38-121.
RX PubMed=7619494;
RA Jacobsson K., Frykberg L.;
RT "Cloning of ligand-binding domains of bacterial receptors by phage
RT display.";
RL BioTechniques 18:878-885(1995).
RN [4]
RP INTERACTION WITH APOH, AND SUBCELLULAR LOCATION.
RX PubMed=10206697; DOI=10.1099/13500872-145-1-177;
RA Zhang L., Jacobsson K., Stroem K., Lindberg M., Frykberg L.;
RT "Staphylococcus aureus expresses a cell surface protein that binds both IgG
RT and beta-2-glycoprotein I.";
RL Microbiology 145:177-183(1999).
RN [5]
RP INDUCTION BY IMMUNOGLOBULIN G, AND DEVELOPMENTAL STAGE.
RX PubMed=10865173; DOI=10.1111/j.1574-695x.2000.tb01479.x;
RA Zhang L., Rosander A., Jacobsson K., Lindberg M., Frykberg L.;
RT "Expression of staphylococcal protein Sbi is induced by human IgG.";
RL FEMS Immunol. Med. Microbiol. 28:211-218(2000).
RN [6]
RP SUBCELLULAR LOCATION, AND EXPORT MECHANISM.
RC STRAIN=RN4220, and SH1000;
RX PubMed=20472795; DOI=10.1128/jb.01452-09;
RA Sibbald M.J., Winter T., van der Kooi-Pol M.M., Buist G., Tsompanidou E.,
RA Bosma T., Schafer T., Ohlsen K., Hecker M., Antelmann H., Engelmann S.,
RA van Dijl J.M.;
RT "Synthetic effects of secG and secY2 mutations on exoproteome biogenesis in
RT Staphylococcus aureus.";
RL J. Bacteriol. 192:3788-3800(2010).
CC -!- FUNCTION: Plays a role in the inhibition of both the innate and
CC adaptive immune responses. Possesses two N-terminal domains that bind
CC the Fc region of IgG and two domains that form a tripartite complex
CC with complement factors C3b and CFH. By recruiting CFH and C3b, the
CC secreted form acts as a potent complement inhibitor of the alternative
CC pathway-mediated lysis. {ECO:0000250|UniProtKB:A6QJQ7}.
CC -!- SUBUNIT: Interacts (via sbi-I and sbi-II domains) with the Fc region of
CC mammalian immunoglobulin G (IgG) proteins (By similarity)
CC (PubMed:9579072). Interacts (via sbi-III and sbi-IV domains) with host
CC complement C3 (By similarity). Interacts (via sbi-III and sbi-IV
CC domains) with host CFH (By similarity). Interacts (via sbi-IV domain)
CC with beta-2-glycoprotein 1/APOH (PubMed:10206697).
CC {ECO:0000250|UniProtKB:A6QJQ7, ECO:0000269|PubMed:10206697,
CC ECO:0000269|PubMed:9579072}.
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:10206697,
CC ECO:0000269|PubMed:20472795}. Cell membrane
CC {ECO:0000250|UniProtKB:A6QJQ7}. Note=Occurs both extracellularly and
CC associated with the cytoplasmic membrane where only the domains I and
CC II are exposed to the extracellular media (By similarity). Membrane
CC association occurs via binding to lipoteichoic acid (By similarity).
CC {ECO:0000250|UniProtKB:A6QJQ7}.
CC -!- DEVELOPMENTAL STAGE: Expression peaks approximately 2 hours after the
CC addition of human IgG. {ECO:0000269|PubMed:10865173}.
CC -!- INDUCTION: Strongly expressed in the presence of human IgG.
CC {ECO:0000269|PubMed:10865173}.
CC -!- DOMAIN: Sbi-I and sbi-II domains provide protection only when anchored
CC to the cell surface, whereas only the secreted sbi-III and sbi-IV
CC domains are biologically active. {ECO:0000250|UniProtKB:A6QJQ7}.
CC -!- SIMILARITY: Belongs to the immunoglobulin-binding protein Sbi family.
CC {ECO:0000305}.
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DR EMBL; AF027155; AAC38446.1; -; Genomic_DNA.
DR EMBL; CP000253; ABD31714.1; -; Genomic_DNA.
DR RefSeq; WP_000792564.1; NZ_LS483365.1.
DR RefSeq; YP_501168.1; NC_007795.1.
DR AlphaFoldDB; Q2FVK5; -.
DR SMR; Q2FVK5; -.
DR STRING; 1280.SAXN108_2673; -.
DR EnsemblBacteria; ABD31714; ABD31714; SAOUHSC_02706.
DR GeneID; 3919725; -.
DR KEGG; sao:SAOUHSC_02706; -.
DR PATRIC; fig|93061.5.peg.2450; -.
DR eggNOG; COG1388; Bacteria.
DR HOGENOM; CLU_051343_0_0_9; -.
DR OMA; NAHASEQ; -.
DR PRO; PR:Q2FVK5; -.
DR Proteomes; UP000008816; Chromosome.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0019864; F:IgG binding; IEA:UniProtKB-KW.
DR Gene3D; 1.10.10.1270; -; 1.
DR InterPro; IPR009063; Ig/albumin-bd_sf.
DR InterPro; IPR021657; IgG-binding_Sbi_dom_IV.
DR InterPro; IPR003132; Protein_A_Ig-bd.
DR InterPro; IPR041909; Sbi_C3_db_domIV.
DR Pfam; PF02216; B; 2.
DR Pfam; PF11621; Sbi-IV; 1.
DR SUPFAM; SSF46997; SSF46997; 2.
PE 1: Evidence at protein level;
KW Cell membrane; IgG-binding protein; Membrane; Reference proteome; Repeat;
KW Secreted; Signal; Virulence.
FT SIGNAL 1..29
FT /evidence="ECO:0000255"
FT CHAIN 30..436
FT /note="Immunoglobulin-binding protein Sbi"
FT /id="PRO_0000361894"
FT REPEAT 43..94
FT /note="B 1"
FT REPEAT 95..148
FT /note="B 2"
FT REPEAT 267..271
FT /note="2-1"
FT REPEAT 272..276
FT /note="2-2"
FT REPEAT 277..281
FT /note="2-3"
FT REPEAT 282..286
FT /note="2-4"
FT REPEAT 287..291
FT /note="2-5"
FT REPEAT 292..296
FT /note="2-6"
FT REPEAT 297..301
FT /note="2-7"
FT REPEAT 302..306
FT /note="2-8"
FT REGION 42..94
FT /note="Sbi-D1"
FT REGION 103..153
FT /note="Sbi-D2"
FT REGION 154..195
FT /note="Sbi-D3"
FT REGION 196..253
FT /note="Sbi-D4"
FT REGION 267..306
FT /note="8 X 5 AA tandem repeat of P-[KQ]-[AISV]-[EKQ]-
FT [AKLSV]"
SQ SEQUENCE 436 AA; 50070 MW; 6526AE719C6CD051 CRC64;
MKNKYISKLL VGAATITLAT MISNGEAKAS ENTQQTSTKH QTTQNNYVTD QQKAFYQVLH
LKGITEEQRN QYIKTLREHP ERAQEVFSES LKDSKNPDRR VAQQNAFYNV LKNDNLTEQE
KNNYIAQIKE NPDRSQQVWV ESVQSSKAKE RQNIENADKA IKDFQDNKAP HDKSAAYEAN
SKLPKDLRDK NNRFVEKVSI EKAIVRHDER VKSANDAISK LNEKDSIENR RLAQREVNKA
PMDVKEHLQK QLDALVAQKD AEKKVAPKVE APQIQSPQIE KPKVESPKVE VPQIQSPKVE
VPQSKLLGYY QSLKDSFNYG YKYLTDTYKS YKEKYDTAKY YYNTYYKYKG AIDQTVLTVL
GSGSKSYIQP LKVDDKNGYL AKSYAQVRNY VTESINTGKV LYTFYQNPTL VKTAIKAQET
ASSIKNTLSN LLSFWK