ID   LON_ECOL6               Reviewed;         784 AA.
AC   P0A9M1; P08177; P78219;
DT   01-AUG-1988, integrated into UniProtKB/Swiss-Prot.
DT   19-JUL-2005, sequence version 1.
DT   03-AUG-2022, entry version 109.
DE   RecName: Full=Lon protease {ECO:0000255|HAMAP-Rule:MF_01973};
DE            EC=3.4.21.53 {ECO:0000255|HAMAP-Rule:MF_01973};
DE   AltName: Full=ATP-dependent protease La {ECO:0000255|HAMAP-Rule:MF_01973};
GN   Name=lon {ECO:0000255|HAMAP-Rule:MF_01973}; OrderedLocusNames=c0555;
OS   Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Escherichia.
OX   NCBI_TaxID=199310;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CFT073 / ATCC 700928 / UPEC;
RX   PubMed=12471157; DOI=10.1073/pnas.252529799;
RA   Welch R.A., Burland V., Plunkett G. III, Redford P., Roesch P., Rasko D.,
RA   Buckles E.L., Liou S.-R., Boutin A., Hackett J., Stroud D., Mayhew G.F.,
RA   Rose D.J., Zhou S., Schwartz D.C., Perna N.T., Mobley H.L.T.,
RA   Donnenberg M.S., Blattner F.R.;
RT   "Extensive mosaic structure revealed by the complete genome sequence of
RT   uropathogenic Escherichia coli.";
RL   Proc. Natl. Acad. Sci. U.S.A. 99:17020-17024(2002).
CC   -!- FUNCTION: ATP-dependent serine protease that mediates the selective
CC       degradation of mutant and abnormal proteins as well as certain short-
CC       lived regulatory proteins. Required for cellular homeostasis and for
CC       survival from DNA damage and developmental changes induced by stress.
CC       Degrades polypeptides processively to yield small peptide fragments
CC       that are 5 to 10 amino acids long. Binds to DNA in a double-stranded,
CC       site-specific manner. Endogenous substrates include the regulatory
CC       proteins RcsA and SulA, the transcriptional activator SoxS, and UmuD.
CC       Its overproduction specifically inhibits translation through at least
CC       two different pathways, one of them being the YoeB-YefM toxin-antitoxin
CC       system. {ECO:0000255|HAMAP-Rule:MF_01973}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Hydrolysis of proteins in presence of ATP.; EC=3.4.21.53;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01973};
CC   -!- ACTIVITY REGULATION: Contains an allosteric site (distinct from its
CC       active site), whose occupancy by an unfolded polypeptide leads to
CC       enzyme activation. {ECO:0000255|HAMAP-Rule:MF_01973}.
CC   -!- SUBUNIT: Homohexamer. Organized in a ring with a central cavity. ATP
CC       binding and hydrolysis do not affect the oligomeric state of the
CC       enzyme. {ECO:0000255|HAMAP-Rule:MF_01973}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_01973}.
CC   -!- INDUCTION: By accumulation of abnormal proteins, such as at high
CC       temperatures. Under stress conditions. {ECO:0000255|HAMAP-
CC       Rule:MF_01973}.
CC   -!- SIMILARITY: Belongs to the peptidase S16 family. {ECO:0000255|HAMAP-
CC       Rule:MF_01973}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAN79033.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; AE014075; AAN79033.1; ALT_INIT; Genomic_DNA.
DR   RefSeq; WP_001295325.1; NC_004431.1.
DR   AlphaFoldDB; P0A9M1; -.
DR   BMRB; P0A9M1; -.
DR   SMR; P0A9M1; -.
DR   STRING; 199310.c0555; -.
DR   MEROPS; S16.001; -.
DR   PRIDE; P0A9M1; -.
DR   EnsemblBacteria; AAN79033; AAN79033; c0555.
DR   GeneID; 67416486; -.
DR   KEGG; ecc:c0555; -.
DR   eggNOG; COG0466; Bacteria.
DR   HOGENOM; CLU_004109_4_3_6; -.
DR   OMA; GAWQVVD; -.
DR   Proteomes; UP000001410; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0016887; F:ATP hydrolysis activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0004176; F:ATP-dependent peptidase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0043565; F:sequence-specific DNA binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0004252; F:serine-type endopeptidase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0034605; P:cellular response to heat; IEA:UniProtKB-UniRule.
DR   GO; GO:0006515; P:protein quality control for misfolded or incompletely synthesized proteins; IEA:UniProtKB-UniRule.
DR   Gene3D; 2.30.130.40; -; 1.
DR   Gene3D; 3.30.230.10; -; 1.
DR   Gene3D; 3.40.50.300; -; 1.
DR   HAMAP; MF_01973; lon_bact; 1.
DR   InterPro; IPR003593; AAA+_ATPase.
DR   InterPro; IPR003959; ATPase_AAA_core.
DR   InterPro; IPR027543; Lon_bac.
DR   InterPro; IPR004815; Lon_bac/euk-typ.
DR   InterPro; IPR008269; Lon_proteolytic.
DR   InterPro; IPR027065; Lon_Prtase.
DR   InterPro; IPR003111; Lon_prtase_N.
DR   InterPro; IPR046336; Lon_prtase_N_sf.
DR   InterPro; IPR027417; P-loop_NTPase.
DR   InterPro; IPR008268; Peptidase_S16_AS.
DR   InterPro; IPR015947; PUA-like_sf.
DR   InterPro; IPR020568; Ribosomal_S5_D2-typ_fold.
DR   InterPro; IPR014721; Ribosomal_S5_D2-typ_fold_subgr.
DR   PANTHER; PTHR10046; PTHR10046; 1.
DR   Pfam; PF00004; AAA; 1.
DR   Pfam; PF05362; Lon_C; 1.
DR   Pfam; PF02190; LON_substr_bdg; 1.
DR   PIRSF; PIRSF001174; Lon_proteas; 1.
DR   SMART; SM00382; AAA; 1.
DR   SMART; SM00464; LON; 1.
DR   SUPFAM; SSF52540; SSF52540; 1.
DR   SUPFAM; SSF54211; SSF54211; 1.
DR   SUPFAM; SSF88697; SSF88697; 1.
DR   TIGRFAMs; TIGR00763; lon; 1.
DR   PROSITE; PS51787; LON_N; 1.
DR   PROSITE; PS51786; LON_PROTEOLYTIC; 1.
DR   PROSITE; PS01046; LON_SER; 1.
PE   3: Inferred from homology;
KW   ATP-binding; Cytoplasm; Hydrolase; Nucleotide-binding; Protease;
KW   Serine protease; Stress response.
FT   CHAIN           1..784
FT                   /note="Lon protease"
FT                   /id="PRO_0000076134"
FT   DOMAIN          11..202
FT                   /note="Lon N-terminal"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01123"
FT   DOMAIN          592..773
FT                   /note="Lon proteolytic"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01122"
FT   ACT_SITE        679
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01973"
FT   ACT_SITE        722
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01973"
FT   BINDING         356..363
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01973"
SQ   SEQUENCE   784 AA;  87438 MW;  4042499C97694EF8 CRC64;
     MNPERSERIE IPVLPLRDVV VYPHMVIPLF VGREKSIRCL EAAMDHDKKI MLVAQKEAST
     DEPGVNDLFT VGTVASILQM LKLPDGTVKV LVEGLQRARI SALSDNGEHF SAKAEYLESP
     TIDEREQEVL VRTAISQFEG YIKLNKKIPP EVLTSLNSID DPARLADTIA AHMPLKLADK
     QSVLEMSDVN ERLEYLMAMM ESEIDLLQVE KRIRNRVKKQ MEKSQREYYL NEQMKAIQKE
     LGEMDDAPDE NEALKRKIDA AKMPKEAKEK AEAELQKLKM MSPMSAEATV VRGYIDWMVQ
     VPWNARSKVK KDLRQAQEIL DTDHYGLERV KDRILEYLAV QSRVNKIKGP ILCLVGPPGV
     GKTSLGQSIA KATGRKYVRM ALGGVRDEAE IRGHRRTYIG SMPGKLIQKM AKVGVKNPLF
     LLDEIDKMSS DMRGDPASAL LEVLDPEQNV AFSDHYLEVD YDLSDVMFVA TSNSMNIPAP
     LLDRMEVIRL SGYTEDEKLN IAKRHLLPKQ IERNALKKGE LTVDDSAIIG IIRYYTREAG
     VRGLEREISK LCRKAVKQLL LDKSLKHIEI NGDNLHDYLG VQRFDYGRAD NENRVGQVTG
     LAWTEVGGDL LTIETACVPG KGKLTYTGSL GEVMQESIQA ALTVVRARAE KLGINPDFYE
     KRDIHVHVPE GATPKDGPSA GIAMCTALVS CLTGNPVRAD VAMTGEITLR GQVLPIGGLK
     EKLLAAHRGG IKTVLIPFEN KRDLEEIPDN VIADLDIHPV KRIEEVLTLA LQNEPSGMQV
     VTAK