regulates
enables
enabled by
molecularly interacts with
directly regulates activity of
The entity A, immediately upstream of the entity B, has an activity that regulates an activity performed by B. For example, A and B may be gene products and binding of B by A regulates the kinase activity of B.
A and B can be physically interacting but not necessarily. Immediately upstream means there are no intermediate entity between A and B.
molecularly controls
regulates activity of
material entity