Protein Ocr

UniProtKB accession:  P03775

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Prevents both degradation and modification of T7 DNA by the host restriction-modification complex (PubMed:1095770, PubMed:32039758). Structural mimic of the phosphate backbone of B-form DNA that binds to and completely occupies the DNA-binding sites of all known families of the complex type I DNA restriction enzymes (PubMed:12235377, PubMed:32483229). Thereby, inhibits the restriction endonuclease activity and protects the phage genome as it penetrates into host cytoplasm (PubMed:12235377, PubMed:32483229). Inhibits host transcription by binding to the bacterial RNAP and competing with sigma factors (PubMed:32039758). Inhibits the host exclusion defense system BREX (PubMed:32338761).