Protein: LexA repressor (EC 3.4.21.88) (Q9PH24)
Organism: Xylella fastidiosa (strain 9a5c)
Function: 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.
Sequence: MSLSDIQQAILSLITNHINADGVSPSQTEIARAFGFKGVRAVQHHLDVLEQQGMIRRVPRQARGIRLKHLTEVDETALALQSEDVLRLPVLGRVAAGQPIGADIGEGRVVLLDRVFFSPAPDYLLRVQGDSMRDEGIFDGDLIGVHRTQDAHSGQIVVARIDDEITVKLLKISKDRIRLLPRNPDFAPIEVRSDQDFAIEGLYCGLLRPNR
InterPro domains: - IPR036390: Winged helix DNA-binding domain superfamily (homologous_superfamily) [1-69]
- IPR006197: Peptidase S24, LexA-like (family) [123-174]
- IPR039418: LexA-like (domain) [123-195]
- IPR050077: LexA repressor (family) [2-209]
- IPR006200: Transcription regulator LexA (family) [2-210]
- IPR006199: LexA repressor, DNA-binding domain (domain) [2-64]
- IPR015927: Peptidase S24/S26A/S26B/S26C (domain) [89-202]
- IPR036286: LexA/Signal peptidase-like superfamily (homologous_superfamily) [86-208]
- IPR036388: Winged helix-like DNA-binding domain superfamily (homologous_superfamily) [1-67]
Interaction partners: - Protein RecA
- Recombination-associated protein RdgC
- DNA repair protein RecN
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0140110 (transcription regulator activity), GO:0097159 (organic cyclic compound binding), GO:1901363 (heterocyclic compound binding), GO:0003700 (DNA-binding transcription factor activity), GO:0003676 (nucleic acid binding), GO:0001217 (DNA-binding transcription repressor activity), GO:0003677 (DNA binding), GO:0001067 (transcription regulatory region nucleic acid binding), GO:0003690 (double-stranded DNA binding), GO:0043565 (sequence-specific DNA binding), GO:0000976 (transcription cis-regulatory region binding), GO:1990837 (sequence-specific double-stranded DNA binding)
Biological Process (BP): GO:0008150 (biological process), GO:0065007 (biological regulation), GO:0050896 (response to stimulus), GO:0050789 (regulation of biological process), GO:0009987 (cellular process), GO:0048519 (negative regulation of biological process), GO:0009605 (response to external stimulus), GO:0019222 (regulation of metabolic process), GO:0050794 (regulation of cellular process), GO:0051716 (cellular response to stimulus), GO:0006950 (response to stress), GO:0048523 (negative regulation of cellular process), GO:0007154 (cell communication), GO:0009892 (negative regulation of metabolic process), GO:0009991 (response to extracellular stimulus), GO:0051172 (negative regulation of nitrogen compound metabolic process), GO:0033554 (cellular response to stress), GO:0010605 (negative regulation of macromolecule metabolic process), GO:0009889 (regulation of biosynthetic process), GO:0051171 (regulation of nitrogen compound metabolic process), GO:0060255 (regulation of macromolecule metabolic process), GO:0031323 (regulation of cellular metabolic process), GO:0009890 (negative regulation of biosynthetic process), GO:0031668 (cellular response to extracellular stimulus), GO:0080090 (regulation of primary metabolic process), GO:0031324 (negative regulation of cellular metabolic process), GO:0071496 (cellular response to external stimulus), GO:0010556 (regulation of macromolecule biosynthetic process), GO:0006974 (cellular response to DNA damage stimulus), GO:0009432 (SOS response), GO:0031326 (regulation of cellular biosynthetic process), GO:0019219 (regulation of nucleobase-containing compound metabolic process), GO:0010558 (negative regulation of macromolecule biosynthetic process), GO:0031327 (negative regulation of cellular biosynthetic process), GO:0051252 (regulation of RNA metabolic process), GO:0051253 (negative regulation of RNA metabolic process), GO:0045934 (negative regulation of nucleobase-containing compound metabolic process), GO:0010468 (regulation of gene expression), GO:2001141 (regulation of RNA biosynthetic process), GO:1902679 (negative regulation of RNA biosynthetic process), GO:0006355 (regulation of DNA-templated transcription), GO:1903507 (negative regulation of nucleic acid-templated transcription), GO:1903506 (regulation of nucleic acid-templated transcription), GO:0045892 (negative regulation of DNA-templated transcription)
Cellular Component (CC): GO:0005575 (cellular component), GO:0032991 (protein-containing complex), GO:0032993 (protein-DNA complex)