Evolutionary Role of Restriction/Modification Systems as Revealed by Comparative Genome Analysis

Table 3.

Comparison of Palindrome Avoidance in Phages and Respective Bacterial Hosts

Phage Length 4 Length 6
PB OEp/OEc PB OEp/OEc
PBSX + 1.54 ++ 1.58
SPBc3 + 1.53 ++ 1.54
PZA 0 1.63 0 0.98
α3 0 1.35 ++ 2.15
f1 0 1.34 0 1.28
fd 0 1.47 0 1.28
fr ++ 2.30 ++ 2.27
G4 + 1.54 ++ 2.08
GA + 1.90 ++ 2.06
I2-2 0 1.29 ++/+ 1.49
If1 0 1.00 ++ 1.53
Ike ++ 1.65 ++ 1.58
λ 0 0.94 0 0.87
MS2 + 1.88 ++ 2.36
MX1 + 2.01 ++ 2.33
Mu 0 1.05 + 1.16
N15 + 1.37 ++/+ 1.59
NL95 ++ 2.30 ++ 2.41
P2 + 1.59 ++/+ 1.50
P4 + 1.59 ++ 1.74
φK 0 1.23 ++ 1.93
φX174 0 0.86 ++/+ 1.52
PRD1 0 0.95 0 1.05
S13 0 0.93 + 1.45
T3 0 1.15 +/0 1.00
T4 0 1.25 ++ 1.77
T7 0 0.75 +/0 1.19
HP1 0 1.24 ++ 2.11
PsiM2 0 1.03 0 0.99
D29 0 1.00 — 0.40
L5 0 0.96 — 0.51
Pf1 ++ 2.25 0 1.17
Pf3 ++ 2.80 0 1.09
φCTX + 2.35 +/0 1.33
PP7 ++ 2.44 ++/+ 1.63

  • PB displays the results of the tests if palindromes are more avoided in phage (— and -) or in bacteria (+ and ++). When the two alternative tests (see Methods) give different results, they are indicated by a slash. Column OEp/OEc is the ratio of observed to expected number of restriction sites on phages, to the same ratio on bacteria. The description of the remaining abbreviations can be found in the Table 1 footnote.

This Article

  1. Published in Advance May 8, 2001, doi: 10.1101/gr.153101 Genome Res. 11: 946-958

Preprint Server



Current Issue

  1. March 2026, 36 (3)
  1. Current Issue
  1. Alert me to new issues of Genome Research