Bacteriophage T4 RNase H is a 5' to 3' exonuclease that removes RNA primers from the lagging strand of the DNA replication fork and is a member of the RAD2 family of eukaryotic and prokaryotic replication and repair nucleases. The crystal structure of the full-length native form of T4 RNase H has been solved at 2 ...
Bacteriophage T4 RNase H is a 5' to 3' exonuclease that removes RNA primers from the lagging strand of the DNA replication fork and is a member of the RAD2 family of eukaryotic and prokaryotic replication and repair nucleases. The crystal structure of the full-length native form of T4 RNase H has been solved at 2.06 angstroms resolution in the presence of Mg2+ but in the absence of nucleic acids. The most conserved residues are clustered together in a large cleft with two Mg2+ in the proposed active site. This structure suggests the way in which the widely separated conserved regions in the larger nucleotide excision repair proteins, such as human XPG, could assemble into a structure like that of the smaller replication nucleases.
Related Citations:
Purification of Bacteriophage T4 DNA Replication Proteins Nossal, N.G., Hinton, D.M., Hobbs, L.J., Spacciapoli, P. (1995) Methods Enzymol 262: 560
Bacteriophage T4 Encodes an Rnase H which Removes RNA Primers Made by the T4 Replication System in Vitro Hollingsworth, H.C., Nossal, N.G. (1991) J Biol Chem 266: 1888
Organization of the Bacteriophage T4 Genome between Map Positions 150.745 And 145.824 Hahn, S., Ruger, W. (1989) Nucleic Acids Res 17: 6729
The Region of Phage T4 Genes 34, 33 and 59: Primary Structures and Organization on the Genome Hahn, S., Kruse, U., Ruger, W. (1986) Nucleic Acids Res 14: 9311
Organizational Affiliation:
Laboratory of Structural Biology Research, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892-2755, USA.
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