Abstract
The genetic basis of the unique restriction endonuclease DpnI, that cleaves only at a methylated sequence, 5'-GmeATC-3', and of the complementary endonuclease DpnII, which cleaves at the same sequence when it is not methylated, was investigated. Different strains of Streptococcus pneumoniae isolated from patients contained either DpnI (two isolates) or DpnII (six isolates). The latter strains also contained DNA methylated at the 5'-GATC-3' sequence. A restrictable bacteriophage, HB-3, was used to characterize the various strains and to select for transformants. One laboratory strain contained neither DpnI nor Dpn II. It was probably derived from a DpnI-containing strain, and its DNA was not methylated at 5'-GATC-3'. Cells of this strain were transformed to the DpnI restriction phenotype by DNA from a DpnI-containing strain and to the DpnII restriction phenotype by DNA from a DpnII-containing strain. Neither cross-transformation, that is, transformation to one phenotype by DNA from a strain of the other phenotype, nor spontaneous conversion was observed. Extracts of transformants to the new restriction phenotype were shown to contain the corresponding endonuclease.
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- Bernheimer H. P. Lysogenic pneumococci and their bacteriophages. J Bacteriol. 1979 May;138(2):618–624. doi: 10.1128/jb.138.2.618-624.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Bernheimer H. P., Wermundsen I. E., Austrian R. Qualitative differences in the behavior of pneumoncoccal deoxyribonucleic acids transforming to the same capsular type. J Bacteriol. 1967 Jan;93(1):320–333. doi: 10.1128/jb.93.1.320-333.1967. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Betlach M., Hershfield V., Chow L., Brown W., Goodman H., Boyer H. W. A restriction endonuclease analysis of the bacterial plasmid controlling the ecoRI restriction and modification of DNA. Fed Proc. 1976 Jul;35(9):2037–2043. [PubMed] [Google Scholar]
- Ikawa S., Shibata T., Ando T., Saito H. Host-controlled modification and restriction in Bacillus subtilis: Bsu 168-system and BsuR-system in B. subtilis 168. Mol Gen Genet. 1979 Feb 26;170(2):123–127. doi: 10.1007/BF00337786. [DOI] [PubMed] [Google Scholar]
- Lacks S. A. Mechanisms of DNA uptake by cells. Brookhaven Symp Biol. 1977 May 12;(29):147–160. [PubMed] [Google Scholar]
- Lacks S. A. Purification and properties of the complementary endonucleases DpnI and DpnII. Methods Enzymol. 1980;65(1):138–146. doi: 10.1016/s0076-6879(80)65019-8. [DOI] [PubMed] [Google Scholar]
- Lacks S., Greenberg B. A deoxyribonuclease of Diplococcus pneumoniae specific for methylated DNA. J Biol Chem. 1975 Jun 10;250(11):4060–4066. [PubMed] [Google Scholar]
- Lacks S., Greenberg B. Complementary specificity of restriction endonucleases of Diplococcus pneumoniae with respect to DNA methylation. J Mol Biol. 1977 Jul;114(1):153–168. doi: 10.1016/0022-2836(77)90289-3. [DOI] [PubMed] [Google Scholar]
- Lacks S., Greenberg B., Neuberger M. Identification of a deoxyribonuclease implicated in genetic transformation of Diplococcus pneumoniae. J Bacteriol. 1975 Jul;123(1):222–232. doi: 10.1128/jb.123.1.222-232.1975. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lacks S. Integration efficiency and genetic recombination in pneumococcal transformation. Genetics. 1966 Jan;53(1):207–235. doi: 10.1093/genetics/53.1.207. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lacks S. Mutants of Diplococcus pneumoniae that lack deoxyribonucleases and other activities possibly pertinent to genetic transformation. J Bacteriol. 1970 Feb;101(2):373–383. doi: 10.1128/jb.101.2.373-383.1970. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Laskey R. A., Mills A. D. Quantitative film detection of 3H and 14C in polyacrylamide gels by fluorography. Eur J Biochem. 1975 Aug 15;56(2):335–341. doi: 10.1111/j.1432-1033.1975.tb02238.x. [DOI] [PubMed] [Google Scholar]
- Lopez R., Garcia E., Ronda C. Bacteriophages of Streptococcus pneumoniae. Rev Infect Dis. 1981 Mar-Apr;3(2):212–223. doi: 10.1093/clinids/3.2.212. [DOI] [PubMed] [Google Scholar]
- Mann M. B., Rao R. N., Smith H. O. Cloning of restriction and modification genes in E. coli: the HbaII system from Haemophilus haemolyticus. Gene. 1978 Apr;3(2):97–112. doi: 10.1016/0378-1119(78)90054-9. [DOI] [PubMed] [Google Scholar]
- Porter R. D., Shoemaker N. B., Rampe G., Guild W. R. Bacteriophage-associated gene transfer in pneumococcus: transduction or pseudotransduction? J Bacteriol. 1979 Jan;137(1):556–567. doi: 10.1128/jb.137.1.556-567.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
- RAVIN A. W. Reciprocal capsular transformations of pneumococci. J Bacteriol. 1959 Mar;77(3):296–309. doi: 10.1128/jb.77.3.296-309.1959. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Shoemaker N. B., Smith M. D., Guild W. R. Organization and transfer of heterologous chloramphenicol and tetracycline resistance genes in pneumococcus. J Bacteriol. 1979 Aug;139(2):432–441. doi: 10.1128/jb.139.2.432-441.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Smith M. D., Guild W. R. A plasmid in Streptococcus pneumoniae. J Bacteriol. 1979 Feb;137(2):735–739. doi: 10.1128/jb.137.2.735-739.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tiraby J. G., Tiraby E., Fox M. S. Pneumococcal bacteriophages. Virology. 1975 Dec;68(2):566–569. doi: 10.1016/0042-6822(75)90300-1. [DOI] [PubMed] [Google Scholar]
- Vovis G. F., Lacks S. Complementary action of restriction enzymes endo R-DpnI and Endo R-DpnII on bacteriophage f1 DNA. J Mol Biol. 1977 Sep 25;115(3):525–538. doi: 10.1016/0022-2836(77)90169-3. [DOI] [PubMed] [Google Scholar]
- Walder R. Y., Hartley J. L., Donelson J. E., Walder J. A. Cloning and expression of the Pst I restriction-modification system in Escherichia coli. Proc Natl Acad Sci U S A. 1981 Mar;78(3):1503–1507. doi: 10.1073/pnas.78.3.1503. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Weinrauch Y., Lacks S. A. Nonsense mutations in the amylomaltase gene and other loci of Streptococcus pneumoniae. Mol Gen Genet. 1981;183(1):7–12. doi: 10.1007/BF00270130. [DOI] [PubMed] [Google Scholar]
- Zieg J., Silverman M., Hilmen M., Simon M. Recombinational switch for gene expression. Science. 1977 Apr 8;196(4286):170–172. doi: 10.1126/science.322276. [DOI] [PubMed] [Google Scholar]