CHEM 1103 Lecture Notes - Lecture 45: Nitrogen Fixation, Nitrogen Assimilation, Transport Protein

• School: University of Arkansas
• Department: Chemistry
• Course: CHEM 1103
• Professor: Matthew Gerner

Document Summary

Corn protein is low in lys and trp. Incomplete sources can be paired to supplement: beans (low in met) with cereal grains (low in lys) can complement. Nitrogen balance: what"s nitrogen balance, nitrogen balance: nitrogen intake = nitrogen loss. Positive nitrogen balance intake exceeds loss (common in children and pregnant women) Negative nitrogen balance: nitrogen loss is not being balanced by dietary intake. Kwashiokor prolonged insufficient protein intake; causes growth failure, apathy, ulcers, liver enlargement, diarrhea, and decreased heart and kidney function. Can be overcome by providing protein- rich foods (meat, eggs, milk, ect. ) Amino acid transport: amino acids enter the cell via membrane- bound transport proteins, the proteins are classified based on specificity and whether transport is linked to other molecules or ions. These reactions are readily reversible depending on the metabolic needs of the cell a-ketoglutarate/glutamate important for amino acid metabolism and metabolism in general. Oxaloacetate/aspartate important in the removal of nitrogen via the urea cycle.