I cannot for the life of me figure this out. In the following figure, you can find ajuA and AjuA for example.
I do understand that the lower-case ones are the genes. The arrows indicate the direction of transcription. However, what is the difference to the upper-case AjuA? The text speaks of subunits. How are the two related? When do I speak of ajuA and when would I be talking about AjuA?
I would also be happy if you could point me in the direction of some literature about the basics of this kind of notation.
PS: I do understand the mechanisms of the biosynthetic route and am familiar with the different domains in the modules as well as PKS and NRPS modules.