Proteins are synthesized when a gene is ' turned on '. Some proteins are soluble in H2O, some are not. The soluble ones can be transported to other cells in the plant. Remember, N is a mobile element, this is partly why. Two amino acids, methionine and cysteine also contain sulfur.
Peanuts contain all the amino acids essential for human nutrition.
The problem with peanuts is they also contain high amounts of lipids so they are high calorie. Some proteins help to make cellulose more rigid in the cell walls. These proteins are not mobile. These seeds are an important nutrient source for people in developing areas where the traditional primary diet is based on high carbohydrate seeds such as rice and corn.