ID   HESB1_TRIV2             Reviewed;         123 AA.
AC   P46051; Q3M642;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   03-AUG-2022, entry version 115.
DE   RecName: Full=Protein HesB, heterocyst;
GN   Name=hesB1; OrderedLocusNames=Ava_3939;
OS   Trichormus variabilis (strain ATCC 29413 / PCC 7937) (Anabaena variabilis).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Trichormus.
OX   NCBI_TaxID=240292;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=8709854; DOI=10.1111/j.1365-2958.1995.mmi_18020357.x;
RA   Schrautemeier B., Neveling U., Schmitz S.;
RT   "Distinct and differently regulated Mo-dependent nitrogen-fixing systems
RT   evolved for heterocysts and vegetative cells of Anabaena variabilis ATCC
RT   29413: characterization of the fdxH1/2 gene regions as part of the nif1/2
RT   gene clusters.";
RL   Mol. Microbiol. 18:357-369(1995).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 29413 / PCC 7937;
RX   PubMed=25197444; DOI=10.4056/sigs.3899418;
RA   Thiel T., Pratte B.S., Zhong J., Goodwin L., Copeland A., Lucas S., Han C.,
RA   Pitluck S., Land M.L., Kyrpides N.C., Woyke T.;
RT   "Complete genome sequence of Anabaena variabilis ATCC 29413.";
RL   Stand. Genomic Sci. 9:562-573(2014).
CC   -!- FUNCTION: May be required for efficient nitrogen fixation.
CC   -!- DEVELOPMENTAL STAGE: Expressed exclusively within heterocysts.
CC   -!- SIMILARITY: Belongs to the HesB/IscA family. {ECO:0000305}.
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DR   EMBL; Z46887; CAA86985.1; -; Genomic_DNA.
DR   EMBL; CP000117; ABA23544.1; -; Genomic_DNA.
DR   PIR; S70243; S70243.
DR   AlphaFoldDB; P46051; -.
DR   SMR; P46051; -.
DR   STRING; 240292.Ava_3939; -.
DR   EnsemblBacteria; ABA23544; ABA23544; Ava_3939.
DR   KEGG; ava:Ava_3939; -.
DR   eggNOG; COG0316; Bacteria.
DR   HOGENOM; CLU_069054_5_1_3; -.
DR   OMA; DFAWRGL; -.
DR   Proteomes; UP000002533; Chromosome.
DR   GO; GO:0051537; F:2 iron, 2 sulfur cluster binding; IEA:UniProt.
DR   GO; GO:0043158; P:heterocyst differentiation; IEA:UniProtKB-KW.
DR   GO; GO:0016226; P:iron-sulfur cluster assembly; IEA:InterPro.
DR   GO; GO:0009399; P:nitrogen fixation; IEA:UniProtKB-KW.
DR   Gene3D; 2.60.300.12; -; 1.
DR   InterPro; IPR000361; FeS_biogenesis.
DR   InterPro; IPR016092; FeS_cluster_insertion.
DR   InterPro; IPR017870; FeS_cluster_insertion_CS.
DR   InterPro; IPR035903; HesB-like_dom_sf.
DR   Pfam; PF01521; Fe-S_biosyn; 1.
DR   SUPFAM; SSF89360; SSF89360; 1.
DR   TIGRFAMs; TIGR00049; TIGR00049; 1.
DR   PROSITE; PS01152; HESB; 1.
PE   2: Evidence at transcript level;
KW   Heterocyst; Nitrogen fixation.
FT   CHAIN           1..123
FT                   /note="Protein HesB, heterocyst"
FT                   /id="PRO_0000076984"
SQ   SEQUENCE   123 AA;  13037 MW;  B436672B00E2B7BD CRC64;
     MTVTLTEKAE FRLRAFLRGS AKDANETTKG IRISVKDGGC SGYEYLMDVT SQPQPDDLVS
     QQGSVLVYVD AKSAPLLEGI VIDFVEGLVE SGFKFTNPNA TSTCGCGKSF KAGDCSPEGV
     PCS