Which of the following is true about Glutamate synthesis?
1) Glutamate is synthesized by the reductive aminoation of alpha-ketogluterate catalyzed by glutamate dehydrogenase.
2) Glutamate arises by aminotransferases reactions, with the amino nitrogen being donated by a number of different amino acids.
3) Glutamate is a general collector of amino acids.
4) All the above