Figure
1. Crisscross regulation of compartmentalized sigma factors.
Summary of the proposed interrelationship of sigma F, E, G
and K in postseptation sporangium (see text). The thin, vertical
lines indicate intracellular pathways of transcriptional control;
the circular arrows indicate autoregulation. The heavy diagonal
lines indicate acting at the level of sigma-factor activity.
Figure
2. Coupling pro-sigma factor processing to morphogenesis.
Thick arrows indicate signals generated by a morphological
feature of the developing sporangium which requires the action
of a previous sigma factor. Signals are transduced by the
products of spo genes which trigger conversion of their mature
forms (thin arrows).
