ID   CCMK3_SYNY3             Reviewed;         103 AA.
AC   P73406;
DT   01-NOV-1997, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1997, sequence version 1.
DT   27-MAR-2024, entry version 110.
DE   RecName: Full=Carboxysome shell protein CcmK3 {ECO:0000255|HAMAP-Rule:MF_00854, ECO:0000303|PubMed:31603944};
DE   AltName: Full=Carbon dioxide-concentrating mechanism protein CcmK3 {ECO:0000255|HAMAP-Rule:MF_00854};
GN   Name=ccmK3 {ECO:0000255|HAMAP-Rule:MF_00854,
GN   ECO:0000303|PubMed:31603944}; OrderedLocusNames=slr1838;
OS   Synechocystis sp. (strain PCC 6803 / Kazusa).
OC   Bacteria; Cyanobacteriota; Cyanophyceae; Synechococcales; Merismopediaceae;
OC   Synechocystis.
OX   NCBI_TaxID=1111708;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 6803 / Kazusa;
RX   PubMed=8905231; DOI=10.1093/dnares/3.3.109;
RA   Kaneko T., Sato S., Kotani H., Tanaka A., Asamizu E., Nakamura Y.,
RA   Miyajima N., Hirosawa M., Sugiura M., Sasamoto S., Kimura T., Hosouchi T.,
RA   Matsuno A., Muraki A., Nakazaki N., Naruo K., Okumura S., Shimpo S.,
RA   Takeuchi C., Wada T., Watanabe A., Yamada M., Yasuda M., Tabata S.;
RT   "Sequence analysis of the genome of the unicellular cyanobacterium
RT   Synechocystis sp. strain PCC6803. II. Sequence determination of the entire
RT   genome and assignment of potential protein-coding regions.";
RL   DNA Res. 3:109-136(1996).
RN   [2]
RP   SUBUNIT.
RC   STRAIN=PCC 6803 / Kazusa;
RX   PubMed=31603944; DOI=10.1371/journal.pone.0223877;
RA   Garcia-Alles L.F., Root K., Maveyraud L., Aubry N., Lesniewska E.,
RA   Mourey L., Zenobi R., Truan G.;
RT   "Occurrence and stability of hetero-hexamer associations formed by beta-
RT   carboxysome CcmK shell components.";
RL   PLoS ONE 14:e0223877-e0223877(2019).
CC   -!- FUNCTION: A probably minor shell protein component of the carboxysome,
CC       a polyhedral inclusion where RuBisCO (ribulose bisphosphate
CC       carboxylase, rbcL-rbcS) is sequestered. This subunit probably does not
CC       form homohexamers. {ECO:0000305|PubMed:31603944}.
CC   -!- SUBUNIT: Forms mixed heterohexamers with CcmK4, probably with 1:5
CC       CcmK3:CcmK4 stoichiometry. Only very weak interactions with CcmK1 and
CC       CcmK2 were seen (PubMed:31603944). Bulky residues in the pore region
CC       probably preclude the formation of homohexamers by this subunit
CC       (Probable). {ECO:0000269|PubMed:31603944, ECO:0000305|PubMed:31603944}.
CC   -!- SUBCELLULAR LOCATION: Carboxysome {ECO:0000255|HAMAP-Rule:MF_00854}.
CC       Note=This cyanobacterium makes beta-type carboxysomes. {ECO:0000305}.
CC   -!- SIMILARITY: Belongs to the bacterial microcompartments protein family.
CC       CcmK subfamily. {ECO:0000255|HAMAP-Rule:MF_00854}.
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DR   EMBL; BA000022; BAA17446.1; -; Genomic_DNA.
DR   PIR; S77343; S77343.
DR   AlphaFoldDB; P73406; -.
DR   SMR; P73406; -.
DR   IntAct; P73406; 14.
DR   STRING; 1148.gene:10498310; -.
DR   PaxDb; 1148-1652525; -.
DR   EnsemblBacteria; BAA17446; BAA17446; BAA17446.
DR   KEGG; syn:slr1838; -.
DR   eggNOG; COG4577; Bacteria.
DR   InParanoid; P73406; -.
DR   PhylomeDB; P73406; -.
DR   Proteomes; UP000001425; Chromosome.
DR   GO; GO:0031470; C:carboxysome; IEA:UniProtKB-SubCell.
DR   GO; GO:0043886; F:structural constituent of carboxysome shell; IPI:UniProtKB.
DR   GO; GO:0015977; P:carbon fixation; IEA:UniProtKB-UniRule.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   CDD; cd07057; BMC_CcmK; 1.
DR   Gene3D; 3.30.70.1710; -; 1.
DR   HAMAP; MF_00854; CcmK; 1.
DR   InterPro; IPR020808; Bact_microcomp_CS.
DR   InterPro; IPR000249; BMC_dom.
DR   InterPro; IPR046380; CcmK.
DR   InterPro; IPR037233; CcmK-like_sf.
DR   InterPro; IPR044872; CcmK/CsoS1_BMC.
DR   PANTHER; PTHR33941:SF13; CARBOXYSOME SHELL PROTEIN CCMK4; 1.
DR   PANTHER; PTHR33941; PROPANEDIOL UTILIZATION PROTEIN PDUA; 1.
DR   Pfam; PF00936; BMC; 1.
DR   SMART; SM00877; BMC; 1.
DR   SUPFAM; SSF143414; CcmK-like; 1.
DR   PROSITE; PS01139; BMC_1; 1.
DR   PROSITE; PS51930; BMC_2; 1.
PE   1: Evidence at protein level;
KW   Bacterial microcompartment; Carbon dioxide fixation; Carboxysome;
KW   Photosynthesis; Reference proteome.
FT   CHAIN           1..103
FT                   /note="Carboxysome shell protein CcmK3"
FT                   /id="PRO_0000201508"
FT   DOMAIN          4..91
FT                   /note="BMC"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00854"
SQ   SEQUENCE   103 AA;  11003 MW;  203494FA5D483A87 CRC64;
     MPQAVGVIQT LGFPSVLAAA DAMLKGGRVT LVYYDLAERG NFVVAIRGPV SEVNLSMKMG
     LAAVNESVMG GEIVSHYIVP NPPENVLAVL PVEYTEKVAR FRT
//