Abstract: The present invention is directed to recombinant hosts which contain and express the AluI Type-II restriction endonuclease gene. The present invention is also directed to vectors or DNA molecules which contain the gene, and to methods of producing the AluI enzyme. One source of the enzyme is Arthrobacter luteus, although other microorganisms may be used to isolate restriction endonuclease isoschizomers of the invention.

Abstract: The present invention is directed to recombinant hosts which contain and express the ClaI Type-II restriction endonuclease and/or modification methylase genes. The present invention is also directed to vectors or DNA molecules which contain these gene, and to methods of producing the enzymes. One source of these enzyme is Caryophanon latum, although other microorganisms may be used to isolate the restriction endonuclease isoschizomers and modification methylase isoschizomers of the invention.

Abstract: The present invention is directed to recombinant hosts which contain and express XhoI and XhoII Type II restriction endonuclease and/or M.XhoI and M.XhoII modification methylase genes. The present invention is also directed to vectors or DNA molecules which contain these genes, and to methods of producing these enzymes. One source of these enzymes is Xanthomonas campestris pv. holcicola, although other microorganisms may be used to isolate the restriction endonuclease isoschizomers and modification methylase isoschizomers of this invention.

Abstract: The present invention discloses a recombinant DNA molecule having a full length or a truncated T5 DNA polymerase structural gene, each encoding a processive, thioredoxin-independent DNA polymerase. The DNA polymerase of the invention may have 3'-to-5'exonuclease activity or may be substantially reduced in processive 3'-to-5'DNA exonuclease activity. A method for producing these enzymes is also disclosed, as is the proteins produced by this process. The present invention is also directed to a leader sequence important for expression of soluble T5 DNA polymerase protein.

Abstract: The present invention is directed to recombinant hosts which contain and express the HpaII Type-II restriction endonuclease gene. The present invention is also directed to vectors or DNA molecules which contain this gene, and to methods of producing the enzyme. One source of this enzyme is Haemophilus parainfluenzae, although other microorganisms may be used to isolate the restriction endonuclease isoschizomers of the invention.

Abstract: The present invention is directed to recombinant hosts which contain and express XhoI and XhoII Type II restriction endonuclease and/or M.XhoI and M.XhoII modification methylase genes. The present invention is also directed to vectors or DNA molecules which contain these genes, and to methods of producing these enzymes. One source of these enzymes is Xanthomonas campestris pv. holcicola, although other microorganisms may be used to isolate the restriction endonuclease isoschizomers and modification methylase isoschizomers of this invention.

Abstract: The present invention discloses the cloning and expression in a host such as Escherichia coli of the KpnI restriction-modification system from Klebsiella pneumoniae, utilizing a two step protocol. Initial protection of the E. coli host with methylase expressed on a vector was required to stabilize a compatible vector carrying both the endonuclease and the methylase genes on a single DNA fragment. A chromosomal map was generated localizing the genes for KpnI methylase and endonuclease. An E. coli strain was constructed which produced several thousand-fold higher levels of KpnI endonuclease than the level produced by Klebsiella pneumoniae. This invention is also directed to cloning and expression of genes encoding for restriction endonuclease isoschizomers of KpnI and/or modification methylase isoschizomers of KpnI methylase.

Abstract: The present invention is directed to recombinant hosts which contain and express various Type II restriction endonuclease and/or modification methylase genes. In particular, the present invention is concerned with the cloned restriction endonucleases, NgoAIII and NgoAI, which recognize and cleave within or near the double-stranded DNA sequence, 5' CCGCGG 3' and 5' PuGCGCPy 3', respectively. Also provided in this invention are cloned modification methylase genes corresponding to said restriction endonucleases. This invention is further concerned with a cloned modification methylase, M.NgoAII. One source of these enzymes is Neisseria gonorrhoeae, although other microorganisms may be used to isolate the restriction endonuclease isoschizomers and modification methylase isoschizomers of this invention.

Abstract: The present invention discloses the cloning and expression in a host such as Escherichia coli of the KpnI restriction-modification system from Klebsiella pneumoniae, utilizing a two step protocol. Initial protection of the E. coli host with methylase expressed on a vector was required to stabilize a compatible vector carrying both the endonuclease and the methylase genes on a single DNA fragment. A chromosomal map was generated localizing the genes for KpnI methylase and endonuclease. An E. coli strain was constructed which produced several thousand-fold higher levels of KpnI endonuclease than the level produced by Klebsiella pneumoniae. This invention is also directed to cloning and expression of genes encoding for restriction endonuclease isoschizomers of KpnI and/or modification methylase isoschizomers of KpnI methylase.

Abstract: The present invention discloses a recombinant DNA molecule having a structural gene encoding a processive, thioredoxin-independent DNA polymerase, a promoter, and an origin of replication. The protein may also have a processive 3'-to-5' DNA exonuclease activity. A method for producing this enzyme is also disclosed, as is the protein produced by this process. This invention is exemplified by expression of T5 DNA polymerase in E. coli.