Here is a map of a plasmid. Actually, the KanR also has a promoter, but usually people are lazy and don't draw promoters.
All of these genes should also have terminators btw.
For the palsmid to replicate in E coli you only need the pUC ori. To be able to kill bacteria that haven't taken up the plasmid DNA, you need the antibiotic resistance (KanR), The other stuff is payload. And the payload also needs promters and terminators to be expressed. Else the bacterium has the blueprint, but never produces it.
I suggest having a look at this file
http://www.snapgene.com/resources/plasmid_files/image_consortium_plasmids/pUC19/
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