The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
Gene Review

T7p20  -  lysozyme

Enterobacteria phage T7

Welcome! If you are familiar with the subject of this article, you can contribute to this open access knowledge base by deleting incorrect information, restructuring or completely rewriting any text. Read more.

Disease relevance of T7p20


High impact information on T7p20


Chemical compound and disease context of T7p20

  • The size of lysozyme mRNA from T7-infected E. coli RNase III+ and RNase III- strains was analyzed by sucrose gradient sedimentation, dimethylsulfoxide (Me2SO) sucorse gradient sedimentation, and preparative gel electrophoresis [8].

Biological context of T7p20

  • Higher levels of lysozyme supplied by plasmids pLysE or pLysH reduce the fully induced activity of T7 RNA polymerase such that induced cells can continue to grow and produce innocuous target proteins indefinitely [1].
  • These lysozyme-hypersensitive polymerases behave without lysozyme similarly to wild-type polymerase with lysozyme: both remain longer at the promoter before establishing a lysozyme-resistant elongation complex and both increase the length of pausing when elongation complexes encounter an eight-base recognition sequence involved in DNA packaging [9].
  • Investigation of the pre-steady-state kinetics of transcription in the presence and absence of T7 lysozyme indicated that the inhibition of runoff product synthesis was largely due to inhibition of transcription initiation and transition from initiation to elongation [10].
  • Furthermore, a sequence homology comparison with phage T7 lysozyme, also an N-acetylmuramoyl-l-alanine amidase, shows that as many as six of the Drosophila PGRPs could belong to this class of proteins [11].
  • Artificial deletion of lysozyme greatly reduced fitness and delayed lysis, but after evolution both phenotypes approached wild-type values [12].

Anatomical context of T7p20


Associations of T7p20 with chemical compounds


Physical interactions of T7p20


Other interactions of T7p20

  • Low levels of T7 lysozyme supplied by plasmids pLysS or pLysL, which are compatible with the pET vectors for expressing genes from a T7 promoter, are sufficient to stabilize many target plasmids and yet allow high levels of target protein to be produced upon induction of T7 RNA polymerase [1].
  • The presence of T7 lysozyme has the further advantage of facilitating the lysis of cells in preparing extracts for purification of target gene products [1].

Analytical, diagnostic and therapeutic context of T7p20


  1. Use of bacteriophage T7 lysozyme to improve an inducible T7 expression system. Studier, F.W. J. Mol. Biol. (1991) [Pubmed]
  2. Creation of a T7 autogene. Cloning and expression of the gene for bacteriophage T7 RNA polymerase under control of its cognate promoter. Dubendorff, J.W., Studier, F.W. J. Mol. Biol. (1991) [Pubmed]
  3. NMR structure of Citrobacter freundii AmpD, comparison with bacteriophage T7 lysozyme and homology with PGRP domains. Liepinsh, E., Généreux, C., Dehareng, D., Joris, B., Otting, G. J. Mol. Biol. (2003) [Pubmed]
  4. T7 lysozyme inhibits transcription by T7 RNA polymerase. Moffatt, B.A., Studier, F.W. Cell (1987) [Pubmed]
  5. Structure of T7 RNA polymerase complexed to the transcriptional inhibitor T7 lysozyme. Jeruzalmi, D., Steitz, T.A. EMBO J. (1998) [Pubmed]
  6. The structure of bacteriophage T7 lysozyme, a zinc amidase and an inhibitor of T7 RNA polymerase. Cheng, X., Zhang, X., Pflugrath, J.W., Studier, F.W. Proc. Natl. Acad. Sci. U.S.A. (1994) [Pubmed]
  7. Regulation of transcription of the late genes of bacteriophage T7. McAllister, W.T., Wu, H.L. Proc. Natl. Acad. Sci. U.S.A. (1978) [Pubmed]
  8. Effect of RNase III on the size of bacteriophage T7 lysozyme mRNA. Hagen, F.S., Young, E.T. J. Virol. (1978) [Pubmed]
  9. Multiple roles of T7 RNA polymerase and T7 lysozyme during bacteriophage T7 infection. Zhang, X., Studier, F.W. J. Mol. Biol. (2004) [Pubmed]
  10. Inhibition of T7 RNA polymerase: transcription initiation and transition from initiation to elongation are inhibited by T7 lysozyme via a ternary complex with RNA polymerase and promoter DNA. Kumar, A., Patel, S.S. Biochemistry (1997) [Pubmed]
  11. A scavenger function for a Drosophila peptidoglycan recognition protein. Mellroth, P., Karlsson, J., Steiner, H. J. Biol. Chem. (2003) [Pubmed]
  12. Evolutionary robustness of an optimal phenotype: re-evolution of lysis in a bacteriophage deleted for its lysin gene. Heineman, R.H., Molineux, I.J., Bull, J.J. J. Mol. Evol. (2005) [Pubmed]
  13. Nuclease activity of T7 RNA polymerase and the heterogeneity of transcription elongation complexes. Sastry, S.S., Ross, B.M. J. Biol. Chem. (1997) [Pubmed]
  14. Protein kinase of bacteriophage T7. 1. Purification. Pai, S.H., Ponta, H., Rahmsdorf, H.J., Hirsch-Kauffmann, M., Herrlich, P., Schweiger, M. Eur. J. Biochem. (1975) [Pubmed]
  15. Improvement of the T7 expression system by the use of T7 lysozyme. Spehr, V., Frahm, D., Meyer, T.F. Gene (2000) [Pubmed]
WikiGenes - Universities