ATPase enzyme consists of two parts. What are those parts? How are they arranged in the thylakoid membrane? Conformational change occur in which part of the enzyme?

 

 
ATP synthase enzyme has two parts
 
(a) F1 - head piece is a peripheral membrane protein complex and contain the site for synthesis of ATP from ADP +pi (inorganic phosphate). 
 
(b) F0 - integral membrane protein complex that forms the channel through which proton cross the inner membrane.

The arrangment of F1 and F0 in thylakoid membrane is as follows
F- portion is present within the thylakoid membrane.
F- portion of ATP synthase enzymeis present in the stroma if chloroplast.
 
The conformational change occurs in F1 portion of ATP synthasethus, facilitaling the ATP
synthesis.