From which organ is this enzyme secreted from??? He is an aspartic protease enzyme??? With which order from the brain???

 

 

 

Lutesium...

This enzyme is not secreted by an organ per se, but is encoded in the HIV genome.

So is this enzyme synthesized at the body of the infected people by the virus???

Yes. More precisely, infected cells do that.

How does the whole thing proceed HIV virus enters the body locates a host cell and starts building his Protease Enzyme to produce new virons??? But from which Amino-Acids does this Enzyme consists of???

As all viruses it hijacks the hosts cellular mechanisms. As for the rest, you should read up on retroviruses and how they infect cells.