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Somewhere, I have read that we need to consume proteins to make amino acids to make new proteins. What does it suggest? How do we make proteins from proteins?

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I suggest you have a read of the articles on protein and protein metabolism on Wikipedia :) (en.wikipedia.org/wiki/Protein_metabolism) This is a really broad topic and it's best if you study it up yourself. –  Armatus Jun 13 '12 at 19:59
    
Let me know If I'm right with the phrase "proteins that we consume form new proteins that are different". I'm looking for a simple explanation. –  user132314 Jun 13 '12 at 21:04
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2 Answers

up vote 7 down vote accepted

Essentially, yes, "proteins that we consume form new proteins that are different".

The processes are each of them topics for themselves. In short, consumed proteins are digested by peptidases (enzymes) in the stomach, breaking them down into their consituent amino acids. These are absorbed in the gut and transported in the blood to all cells. These take up amino acids and attach them to tRNA molecules which are used in translation to form new body proteins.

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Very elegantly worded. –  bobthejoe Jun 13 '12 at 21:57
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A simple answer, you ingest daily dietary protein, then your body hydrolyze the proteins, to get all the building blocks for other proteins (amino acids).

Also, from diet you can get essential amino acids that cannot be synthesized de novo by the organism, this is more economically than amino acid synthesis.

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