ID   SIGK_MYCSK              Reviewed;         193 AA.
AC   A1ULE1;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   06-FEB-2007, sequence version 1.
DT   25-MAY-2022, entry version 88.
DE   RecName: Full=ECF RNA polymerase sigma factor SigK;
DE            Short=ECF sigma factor SigK;
DE   AltName: Full=Alternative RNA polymerase sigma factor SigK;
DE   AltName: Full=RNA polymerase sigma-K factor;
DE            Short=Sigma-K factor;
GN   Name=sigK; OrderedLocusNames=Mkms_4458;
OS   Mycobacterium sp. (strain KMS).
OC   Bacteria; Actinobacteria; Corynebacteriales; Mycobacteriaceae;
OC   Mycobacterium; unclassified Mycobacterium.
OX   NCBI_TaxID=189918;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=KMS;
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C.,
RA   Glavina del Rio T., Hammon N., Israni S., Dalin E., Tice H., Pitluck S.,
RA   Kiss H., Brettin T., Bruce D., Han C., Tapia R., Gilna P., Schmutz J.,
RA   Larimer F., Land M., Hauser L., Kyrpides N., Mikhailova N., Miller C.D.,
RA   Richardson P.;
RT   "Complete sequence of chromosome of Mycobacterium sp. KMS.";
RL   Submitted (DEC-2006) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Sigma factors are initiation factors that promote the
CC       attachment of RNA polymerase to specific initiation sites and are then
CC       released. Extracytoplasmic function (ECF) sigma factors are held in an
CC       inactive form by an anti-sigma factor until released by regulated
CC       intramembrane proteolysis (By similarity). {ECO:0000250}.
CC   -!- SUBUNIT: Interacts transiently with the RNA polymerase catalytic core
CC       formed by RpoA, RpoB, RpoC and RpoZ (2 alpha, 1 beta, 1 beta' and 1
CC       omega subunit) to form the RNA polymerase holoenzyme that can initiate
CC       transcription. Interacts (via sigma-70 factor domain 4) with anti-
CC       sigma-K factor RskA (By similarity). {ECO:0000250}.
CC   -!- DOMAIN: The sigma-70 factor domain-2 mediates sequence-specific
CC       interaction with the -10 element in promoter DNA, and plays an
CC       important role in melting the double-stranded DNA and the formation of
CC       the transcription bubble. The sigma-70 factor domain-2 mediates
CC       interaction with the RNA polymerase subunits RpoB and RpoC (By
CC       similarity). {ECO:0000250}.
CC   -!- DOMAIN: The sigma-70 factor domain-4 contains a helix-turn-helix (H-T-
CC       H) motif that mediates interaction with the -35 element in promoter
CC       DNA. The domain also mediates interaction with the RNA polymerase
CC       subunit RpoA. Interactions between sigma-70 factor domain-4 and anti-
CC       sigma factors prevents interaction of sigma factors with the RNA
CC       polymerase catalytic core (By similarity). {ECO:0000250}.
CC   -!- MISCELLANEOUS: Extracytoplasmic function (ECF) sigma factors are held
CC       in an inactive form by an anti-sigma factor until released by regulated
CC       intramembrane proteolysis (RIP). RIP occurs when an extracytoplasmic
CC       signal triggers a concerted proteolytic cascade to transmit information
CC       and elicit cellular responses. The membrane-spanning anti-sigma factor
CC       is first cut extracytoplasmically (site-1 protease, S1P), then within
CC       the membrane itself (site-2 protease, S2P, Rip1), while cytoplasmic
CC       proteases finish degrading the regulatory protein, liberating SigK (By
CC       similarity). {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the sigma-70 factor family. ECF subfamily.
CC       {ECO:0000305}.
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DR   EMBL; CP000518; ABL93649.1; -; Genomic_DNA.
DR   RefSeq; WP_011561749.1; NC_008705.1.
DR   AlphaFoldDB; A1ULE1; -.
DR   SMR; A1ULE1; -.
DR   STRING; 189918.Mkms_4458; -.
DR   EnsemblBacteria; ABL93649; ABL93649; Mkms_4458.
DR   KEGG; mkm:Mkms_4458; -.
DR   HOGENOM; CLU_047691_9_3_11; -.
DR   OMA; KGRFFTW; -.
DR   OrthoDB; 1992113at2; -.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0016987; F:sigma factor activity; IEA:UniProtKB-KW.
DR   GO; GO:0006352; P:DNA-templated transcription, initiation; IEA:InterPro.
DR   Gene3D; 1.10.10.10; -; 1.
DR   InterPro; IPR039425; RNA_pol_sigma-70-like.
DR   InterPro; IPR014284; RNA_pol_sigma-70_dom.
DR   InterPro; IPR007627; RNA_pol_sigma70_r2.
DR   InterPro; IPR007630; RNA_pol_sigma70_r4.
DR   InterPro; IPR013325; RNA_pol_sigma_r2.
DR   InterPro; IPR013324; RNA_pol_sigma_r3/r4-like.
DR   InterPro; IPR036388; WH-like_DNA-bd_sf.
DR   PANTHER; PTHR43133; PTHR43133; 1.
DR   Pfam; PF04542; Sigma70_r2; 1.
DR   Pfam; PF04545; Sigma70_r4; 1.
DR   SUPFAM; SSF88659; SSF88659; 1.
DR   SUPFAM; SSF88946; SSF88946; 1.
DR   TIGRFAMs; TIGR02937; sigma70-ECF; 1.
PE   3: Inferred from homology;
KW   DNA-binding; Sigma factor; Transcription; Transcription regulation.
FT   CHAIN           1..193
FT                   /note="ECF RNA polymerase sigma factor SigK"
FT                   /id="PRO_0000313842"
FT   DNA_BIND        161..180
FT                   /note="H-T-H motif"
FT                   /evidence="ECO:0000250"
FT   REGION          35..101
FT                   /note="Sigma-70 factor domain-2"
FT   REGION          140..187
FT                   /note="Sigma-70 factor domain-4"
FT   MOTIF           59..62
FT                   /note="Polymerase core binding"
SQ   SEQUENCE   193 AA;  21658 MW;  44A5983BB07E6F96 CRC64;
     MTALTQPVRL PFVTTDLDVL LRQVAERDVD AFAALYDRTR SRVYGMVTRV LRDPGYSEET
     TQDIYLQVWR SAGSYDPKAG SPMAWLLTLA HRRAVDRVRS EEAASQRESR YGAASVDPPV
     DHVADSVILL DERRRVVDCM GSLSDLQREA IQLAYYEGLT YVQVSERLSA NLATIKSRMR
     GGIRGLKNCL GMS