alteration enzyme

alteration enzyme

[ȯl·tə′rā·shən ‚en‚zīm]
(immunology)
A protein of bacteriophage T4 that is injected into a host bacterium along with the deoxyribonucleic acid of the bacteriophage and that modifies the ribonucleic acid polymerase of the host so that the ribonucleic acid is unable to initiate transcription at host promoters.