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Protein

LexA repressor

Gene

lexA

Organism
Streptomyces clavuligerus (strain ATCC 27064 / DSM 738 / JCM 4710 / NBRC 13307 / NCIMB 12785 / NRRL 3585 / VKM Ac-602)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-Protein inferred from homologyi

Functioni

Represses a number of genes involved in the response to DNA damage (SOS response), including recA and lexA. In the presence of single-stranded DNA, RecA interacts with LexA causing an autocatalytic cleavage which disrupts the DNA-binding part of LexA, leading to derepression of the SOS regulon and eventually DNA repair.UniRule annotation

Catalytic activityi

Hydrolysis of Ala-|-Gly bond in repressor LexA.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Active sitei163For autocatalytic cleavage activityUniRule annotation1
Active sitei200For autocatalytic cleavage activityUniRule annotation1

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
DNA bindingi58 – 78H-T-H motifUniRule annotationAdd BLAST21

GO - Molecular functioni

GO - Biological processi

Keywordsi

Molecular functionDNA-binding, Hydrolase, Repressor
Biological processDNA damage, DNA repair, DNA replication, SOS response, Transcription, Transcription regulation

Protein family/group databases

MEROPSiS24.001.

Names & Taxonomyi

Protein namesi
Recommended name:
LexA repressorUniRule annotation (EC:3.4.21.88UniRule annotation)
Gene namesi
Name:lexAUniRule annotation
OrganismiStreptomyces clavuligerus (strain ATCC 27064 / DSM 738 / JCM 4710 / NBRC 13307 / NCIMB 12785 / NRRL 3585 / VKM Ac-602)
Taxonomic identifieri443255 [NCBI]
Taxonomic lineageiBacteriaActinobacteriaStreptomycetalesStreptomycetaceaeStreptomyces

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001700951 – 239LexA repressorAdd BLAST239

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sitei128 – 129Cleavage; by autolysisUniRule annotation2

Keywords - PTMi

Autocatalytic cleavage

Interactioni

Subunit structurei

Homodimer.UniRule annotation

Structurei

3D structure databases

ProteinModelPortaliO86847.
SMRiO86847.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the peptidase S24 family.UniRule annotation

Phylogenomic databases

eggNOGiENOG4105DS7. Bacteria.
COG1974. LUCA.

Family and domain databases

Gene3Di1.10.10.10. 1 hit.
HAMAPiMF_00015. LexA. 1 hit.
InterProiView protein in InterPro
IPR006200. LexA.
IPR006199. LexA_DNA-bd_dom.
IPR006197. Peptidase_S24_LexA.
IPR015927. Peptidase_S24_S26A/B/C.
IPR011991. WHTH_DNA-bd_dom.
PfamiView protein in Pfam
PF01726. LexA_DNA_bind. 1 hit.
PF00717. Peptidase_S24. 1 hit.
PRINTSiPR00726. LEXASERPTASE.
SUPFAMiSSF46785. SSF46785. 1 hit.
SSF51306. SSF51306. 1 hit.
TIGRFAMsiTIGR00498. lexA. 1 hit.

Sequencei

Sequence statusi: Complete.

O86847-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MTEAATGPEG ADPSRAARSL PGRPPGIRAD SSGLTDRQRR VIEVIRDSVQ
60 70 80 90 100
RRGYPPSMRE IGQAVGLSST SSVAHQLMAL ERKGFLRRDP HRPRAYEVRG
110 120 130 140 150
SDQPSAQPAD TSGKPAASYV PLVGRIAAGG PILAEESVED VFPLPRQLVG
160 170 180 190 200
DGELFVLKVV GDSMIEAAIC DGDWVTVRRQ PVAENGDIVA AMLDGEATVK
210 220 230
RFKRENGHVW LLPHNAAYQP IPGDDATILG KVVAVLRRV
Length:239
Mass (Da):25,681
Last modified:April 27, 2001 - v2
Checksum:i24FD504C72AB154B
GO

Sequence cautioni

The sequence CAA12169 differs from that shown. Reason: Erroneous initiation.Curated

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AJ224870 Genomic DNA. Translation: CAA12169.1. Different initiation.

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.

Entry informationi

Entry nameiLEXA_STRC2
AccessioniPrimary (citable) accession number: O86847
Entry historyiIntegrated into UniProtKB/Swiss-Prot: April 27, 2001
Last sequence update: April 27, 2001
Last modified: July 5, 2017
This is version 103 of the entry and version 2 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Documents

  1. Peptidase families
    Classification of peptidase families and list of entries
  2. SIMILARITY comments
    Index of protein domains and families