ID   CSS4B_PROMP             Reviewed;          73 AA.
AC   Q7V2C5;
DT   10-FEB-2021, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2003, sequence version 1.
DT   25-MAY-2022, entry version 81.
DE   RecName: Full=Carboxysome shell vertex protein CsoS4B {ECO:0000303|PubMed:22155772};
GN   Name=csoS4B {ECO:0000303|PubMed:22155772}; OrderedLocusNames=PMM0555;
OS   Prochlorococcus marinus subsp. pastoris (strain CCMP1986 / NIES-2087 /
OS   MED4).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=59919;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CCMP1986 / NIES-2087 / MED4;
RX   PubMed=12917642; DOI=10.1038/nature01947;
RA   Rocap G., Larimer F.W., Lamerdin J.E., Malfatti S., Chain P., Ahlgren N.A.,
RA   Arellano A., Coleman M., Hauser L., Hess W.R., Johnson Z.I., Land M.L.,
RA   Lindell D., Post A.F., Regala W., Shah M., Shaw S.L., Steglich C.,
RA   Sullivan M.B., Ting C.S., Tolonen A., Webb E.A., Zinser E.R.,
RA   Chisholm S.W.;
RT   "Genome divergence in two Prochlorococcus ecotypes reflects oceanic niche
RT   differentiation.";
RL   Nature 424:1042-1047(2003).
RN   [2]
RP   DISCUSSION OF SEQUENCE, FUNCTION, PROTEIN ABUNDANCE, AND SUBCELLULAR
RP   LOCATION.
RC   STRAIN=CCMP1986 / NIES-2087 / MED4;
RX   PubMed=22155772; DOI=10.1128/jb.06444-11;
RA   Roberts E.W., Cai F., Kerfeld C.A., Cannon G.C., Heinhorst S.;
RT   "Isolation and characterization of the Prochlorococcus carboxysome reveal
RT   the presence of the novel shell protein CsoS1D.";
RL   J. Bacteriol. 194:787-795(2012).
CC   -!- FUNCTION: Probably forms vertices in the carboxysome, a polyhedral
CC       inclusion where RuBisCO (ribulose bisphosphate carboxylase, cbbL-cbbS)
CC       is sequestered. Has been modeled to induce curvature upon insertion
CC       into an otherwise flat hexagonal layer of major carboxysome subunits
CC       (By similarity). Has not been identified in purified carboxysomes; it
CC       is expected to be present in very low amounts (Probable).
CC       {ECO:0000250|UniProtKB:O85043, ECO:0000305|PubMed:22155772}.
CC   -!- SUBUNIT: Homopentamer. {ECO:0000250|UniProtKB:O85043}.
CC   -!- SUBCELLULAR LOCATION: Carboxysome {ECO:0000305|PubMed:22155772}.
CC       Note=Probably forms vertices in the polyhedral carboxysome (By
CC       similarity). This bacterium makes alpha-type carboxysomes
CC       (PubMed:22155772). {ECO:0000250|UniProtKB:O85043,
CC       ECO:0000269|PubMed:22155772}.
CC   -!- DOMAIN: The tight homopentamer forms a pore with an opening of about
CC       3.5 Angstroms in diameter which is positively charged.
CC       {ECO:0000250|UniProtKB:O85043}.
CC   -!- SIMILARITY: Belongs to the CcmL/EutN family. CsoS4 subfamily.
CC       {ECO:0000305}.
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DR   EMBL; BX548174; CAE19014.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q7V2C5; -.
DR   SMR; Q7V2C5; -.
DR   STRING; 59919.PMM0555; -.
DR   EnsemblBacteria; CAE19014; CAE19014; PMM0555.
DR   KEGG; pmm:PMM0555; -.
DR   eggNOG; COG4576; Bacteria.
DR   HOGENOM; CLU_148498_1_0_3; -.
DR   OMA; RHACPDN; -.
DR   Proteomes; UP000001026; Chromosome.
DR   GO; GO:0031470; C:carboxysome; IEA:UniProtKB-SubCell.
DR   GO; GO:0015977; P:carbon fixation; IEA:UniProtKB-KW.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   CDD; cd01614; EutN_CcmL; 1.
DR   Gene3D; 2.40.50.220; -; 1.
DR   InterPro; IPR014077; CsoS4B.
DR   InterPro; IPR004992; EutN_CcmL.
DR   InterPro; IPR036677; EutN_CcmL_sf.
DR   Pfam; PF03319; EutN_CcmL; 1.
DR   SUPFAM; SSF159133; SSF159133; 1.
DR   TIGRFAMs; TIGR02704; carboxysome_B; 1.
DR   PROSITE; PS51932; BMV; 1.
PE   3: Inferred from homology;
KW   Bacterial microcompartment; Carbon dioxide fixation; Carboxysome;
KW   Photosynthesis.
FT   CHAIN           1..73
FT                   /note="Carboxysome shell vertex protein CsoS4B"
FT                   /id="PRO_0000452084"
FT   DOMAIN          1..68
FT                   /note="BMV"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01280"
SQ   SEQUENCE   73 AA;  7875 MW;  E0354F9CB6B5C3D7 CRC64;
     MVCTQRVAGL GHMNLRILEN NKGKKVVAVD PVGAREGNWV FTASGSAARF ACPNPEVQTD
     LTIGGIIDYW ESN