My question is what's is protein? !

Any meats or sometime people say nuts proteins are essential nutrients for the human body. They are one of the building blocks of body tissue, and can also serve as a fuel source.

Protein is a material located inside food ( Most of the time ).

Some proteins are nuts, meats, fruit, and of course, there are more.

Fact: Some people say Gatorade has protein in it, but it actually doesn't. 
There is 0 protein inside a Gatorade.
Just a fact! :)

It is a good thing that put's energy into you and helps you stay awake throughout the day, and keep you going.

But, you cannot eat too much of it, or you could not feel well, as for your body would not cooperate with too much correctly.

Glad I could help, and good luck!

tRNA synthetase is an enzyme that functions to attach the appropriate amino acids on to tRNA. It plays a very important role in translation.

It is an enzyme that is known to covalently link the correct amino acid. There is a formation of a peptide bond in the process of translation. It leads to the expression of the gene in order to create proteins.