248
a
b
Fig. 15.1 ( a ) Phylogeny of the class A ctinobacteria from concatenated
proteins ArgB, ArgC ArgH, ArgR, InfC, TyrS, PheT and
PheS. Freshwater clades are highlighted in blue , including representa-
tives from tribes acIV-Iluma-A2 (K003, K005), acI-B1 (Mendota) and
acI-A6 (K004). Muscle was used to align each protein separately before
alignments concatenation. The resulting alignment was analyzed using
PAML to remove sites with substitution rate > 1. Phylogeny was com-
puted using phyML with a WAG + G4 model and 1000 bootstrap. Only
bootstrap values > 0.5 (500/1000) are reported here. ( b ) Structural orga-
nization of the arginine operon in six freshwater actinobacterial tribes:
AcIV-Iluma-A2 (K003, K005), acIV-Iluma-B1 (Mgen15-A23, unpub-
lished results), acI-B1 (23-D18), acI-A1 (278-O22), acI-A6 (K004),
acI-A7 (44-N04, 23-J06)G. Bronner et al.