ID   EXOA_STRPN              Reviewed;         275 AA.
AC   P0A2X3; P21998;
DT   15-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT   15-MAR-2005, sequence version 1.
DT   03-AUG-2022, entry version 95.
DE   RecName: Full=Exodeoxyribonuclease;
DE            EC=3.1.11.2;
GN   Name=exoA; OrderedLocusNames=SP_1845;
OS   Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4).
OC   Bacteria; Firmicutes; Bacilli; Lactobacillales; Streptococcaceae;
OC   Streptococcus.
OX   NCBI_TaxID=170187;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-334 / TIGR4;
RX   PubMed=11463916; DOI=10.1126/science.1061217;
RA   Tettelin H., Nelson K.E., Paulsen I.T., Eisen J.A., Read T.D.,
RA   Peterson S.N., Heidelberg J.F., DeBoy R.T., Haft D.H., Dodson R.J.,
RA   Durkin A.S., Gwinn M.L., Kolonay J.F., Nelson W.C., Peterson J.D.,
RA   Umayam L.A., White O., Salzberg S.L., Lewis M.R., Radune D.,
RA   Holtzapple E.K., Khouri H.M., Wolf A.M., Utterback T.R., Hansen C.L.,
RA   McDonald L.A., Feldblyum T.V., Angiuoli S.V., Dickinson T., Hickey E.K.,
RA   Holt I.E., Loftus B.J., Yang F., Smith H.O., Venter J.C., Dougherty B.A.,
RA   Morrison D.A., Hollingshead S.K., Fraser C.M.;
RT   "Complete genome sequence of a virulent isolate of Streptococcus
RT   pneumoniae.";
RL   Science 293:498-506(2001).
CC   -!- FUNCTION: In addition to 3'- to 5'-exonuclease and 3'-phosphatase
CC       activities, ExoA was shown to make single-strand breaks at apurinic
CC       sites in DNA. {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Exonucleolytic cleavage in the 3'- to 5'-direction to yield
CC         nucleoside 5'-phosphates.; EC=3.1.11.2;
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420; Evidence={ECO:0000250};
CC       Name=Mn(2+); Xref=ChEBI:CHEBI:29035; Evidence={ECO:0000250};
CC       Note=Probably binds two magnesium or manganese ions per subunit.
CC       {ECO:0000250};
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|PROSITE-ProRule:PRU00764}.
CC   -!- SIMILARITY: Belongs to the DNA repair enzymes AP/ExoA family.
CC       {ECO:0000305}.
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DR   EMBL; AE005672; AAK75918.1; -; Genomic_DNA.
DR   PIR; E95215; E95215.
DR   RefSeq; WP_000767464.1; NZ_AKVY01000001.1.
DR   AlphaFoldDB; P0A2X3; -.
DR   SMR; P0A2X3; -.
DR   STRING; 170187.SP_1845; -.
DR   EnsemblBacteria; AAK75918; AAK75918; SP_1845.
DR   GeneID; 60233847; -.
DR   KEGG; spn:SP_1845; -.
DR   eggNOG; COG0708; Bacteria.
DR   OMA; DCICVQE; -.
DR   PhylomeDB; P0A2X3; -.
DR   BioCyc; SPNE170187:G1FZB-1874-MON; -.
DR   Proteomes; UP000000585; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0003677; F:DNA binding; IEA:InterPro.
DR   GO; GO:0004519; F:endonuclease activity; IEA:InterPro.
DR   GO; GO:0008853; F:exodeoxyribonuclease III activity; IEA:UniProtKB-EC.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0006281; P:DNA repair; IEA:InterPro.
DR   Gene3D; 3.60.10.10; -; 1.
DR   InterPro; IPR004808; AP_endonuc_1.
DR   InterPro; IPR020847; AP_endonuclease_F1_BS.
DR   InterPro; IPR020848; AP_endonuclease_F1_CS.
DR   InterPro; IPR036691; Endo/exonu/phosph_ase_sf.
DR   InterPro; IPR005135; Endo/exonuclease/phosphatase.
DR   PANTHER; PTHR22748; PTHR22748; 1.
DR   Pfam; PF03372; Exo_endo_phos; 1.
DR   SUPFAM; SSF56219; SSF56219; 1.
DR   TIGRFAMs; TIGR00633; xth; 1.
DR   PROSITE; PS00726; AP_NUCLEASE_F1_1; 1.
DR   PROSITE; PS00727; AP_NUCLEASE_F1_2; 1.
DR   PROSITE; PS00728; AP_NUCLEASE_F1_3; 1.
DR   PROSITE; PS51435; AP_NUCLEASE_F1_4; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Exonuclease; Hydrolase; Magnesium; Metal-binding; Nuclease.
FT   CHAIN           1..275
FT                   /note="Exodeoxyribonuclease"
FT                   /id="PRO_0000200026"
FT   ACT_SITE        128
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        167
FT                   /note="Proton donor/acceptor"
FT                   /evidence="ECO:0000250"
FT   BINDING         9
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000250"
FT   BINDING         44
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000250"
FT   BINDING         167
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000250"
FT   BINDING         169
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000250"
FT   BINDING         265
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000250"
FT   SITE            169
FT                   /note="Transition state stabilizer"
FT                   /evidence="ECO:0000250"
FT   SITE            240
FT                   /note="Important for catalytic activity"
FT                   /evidence="ECO:0000250"
FT   SITE            266
FT                   /note="Interaction with DNA substrate"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   275 AA;  31064 MW;  112E5A9FF828A1B9 CRC64;
     MKLISWNIDS LNAALTSDSA RAKLSQEVLQ TLVAENADII AIQETKLSAK GPTKKHVEIL
     EELFPGYENT WRSSQEPARK GYAGTMFLYK KELTPTISFP EIGAPSTMDL EGRIITLEFD
     AFFVTQVYTP NAGDGLKRLE ERQVWDAKYA EYLAELDKEK PVLATGDYNV AHNEIDLANP
     ASNRRSPGFT DEERAGFTNL LATGFTDTFR HVHGDVPERY TWWAQRSKTS KINNTGWRID
     YWLTSNRIAD KVTKSDMIDS GARQDHTPIV LEIDL