Abstract
Several type II restriction-modification (RM) gene complexes kill host bacterial cells that have lost them, through attack on the chromosomal recognition sites of these cells. Two RM gene complexes recognizing the same sequence cannot simultaneously enjoy such stabilization through postsegregational host killing, because one will defend chromosomal sites from attack by the other. In the present work, we analyzed intrahost competition between two RM gene complexes when the recognition sequence of one was included in that of the other. When the EcoRII gene complex, recognizing 5'-CCWGG (W = A, T), is lost from the host, the SsoII gene complex, which recognizes 5'-CCNGG (N = A, T, G, C), will prevent host death by protecting CCWGG sites on the chromosome. However, when the SsoII (CCNGG) gene complex is lost, the EcoRII (CCWGG) gene complex will be unable to prevent host death through attack by SsoII on 5'-CCSGG (S = C, G) sites. These predictions were verified in our experiments, in which we analyzed plasmid maintenance, cell growth, cell shape, and chromosomal DNA. Our results demonstrate the presence of selective pressure for decrease in the specificity of recognition sequence of RM systems in the absence of invading DNA.
| Original language | English |
|---|---|
| Pages (from-to) | 1610-1619 |
| Number of pages | 10 |
| Journal | Molecular Biology and Evolution |
| Volume | 17 |
| Issue number | 11 |
| Publication status | Published - 2000 |
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Keywords
- Molecular evolution
- Restriction and modification
- Sequence recognition
ASJC Scopus subject areas
- Genetics
- Biochemistry
- Genetics(clinical)
- Biochemistry, Genetics and Molecular Biology(all)
- Ecology, Evolution, Behavior and Systematics
- Agricultural and Biological Sciences (miscellaneous)
- Molecular Biology
Cite this
Evolution of sequence recognition by restriction-modification enzymes : Selective pressure for specificity decrease. / Chinen, Akito; Naito, Yasuhiro; Handa, Naofumi; Kobayashi, Ichizo.
In: Molecular Biology and Evolution, Vol. 17, No. 11, 2000, p. 1610-1619.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evolution of sequence recognition by restriction-modification enzymes
T2 - Selective pressure for specificity decrease
AU - Chinen, Akito
AU - Naito, Yasuhiro
AU - Handa, Naofumi
AU - Kobayashi, Ichizo
PY - 2000
Y1 - 2000
N2 - Several type II restriction-modification (RM) gene complexes kill host bacterial cells that have lost them, through attack on the chromosomal recognition sites of these cells. Two RM gene complexes recognizing the same sequence cannot simultaneously enjoy such stabilization through postsegregational host killing, because one will defend chromosomal sites from attack by the other. In the present work, we analyzed intrahost competition between two RM gene complexes when the recognition sequence of one was included in that of the other. When the EcoRII gene complex, recognizing 5'-CCWGG (W = A, T), is lost from the host, the SsoII gene complex, which recognizes 5'-CCNGG (N = A, T, G, C), will prevent host death by protecting CCWGG sites on the chromosome. However, when the SsoII (CCNGG) gene complex is lost, the EcoRII (CCWGG) gene complex will be unable to prevent host death through attack by SsoII on 5'-CCSGG (S = C, G) sites. These predictions were verified in our experiments, in which we analyzed plasmid maintenance, cell growth, cell shape, and chromosomal DNA. Our results demonstrate the presence of selective pressure for decrease in the specificity of recognition sequence of RM systems in the absence of invading DNA.
AB - Several type II restriction-modification (RM) gene complexes kill host bacterial cells that have lost them, through attack on the chromosomal recognition sites of these cells. Two RM gene complexes recognizing the same sequence cannot simultaneously enjoy such stabilization through postsegregational host killing, because one will defend chromosomal sites from attack by the other. In the present work, we analyzed intrahost competition between two RM gene complexes when the recognition sequence of one was included in that of the other. When the EcoRII gene complex, recognizing 5'-CCWGG (W = A, T), is lost from the host, the SsoII gene complex, which recognizes 5'-CCNGG (N = A, T, G, C), will prevent host death by protecting CCWGG sites on the chromosome. However, when the SsoII (CCNGG) gene complex is lost, the EcoRII (CCWGG) gene complex will be unable to prevent host death through attack by SsoII on 5'-CCSGG (S = C, G) sites. These predictions were verified in our experiments, in which we analyzed plasmid maintenance, cell growth, cell shape, and chromosomal DNA. Our results demonstrate the presence of selective pressure for decrease in the specificity of recognition sequence of RM systems in the absence of invading DNA.
KW - Molecular evolution
KW - Restriction and modification
KW - Sequence recognition
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M3 - Article
VL - 17
SP - 1610
EP - 1619
JO - Molecular Biology and Evolution
JF - Molecular Biology and Evolution
SN - 0737-4038
IS - 11
ER -