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| ==Overview== | | ==Overview== |
− | Amino acids are the structural components of proteins in all plants, animals and fungi. Amino acids are considered either '''indispensable (essential)''' and '''dispensable (non-essential)'''. Essential amino acids are those that are required pre-formed in the diet as the animal either lacks the metabolic pathway to synthesise the given amino acid or is unable to make sufficient quantities for growth and normal physiologic/biochemical functions. Non-essential amino acids are those that can be produced endogenously from available nitrogen and carbon sources. There are nine essential amino acids required by humans which are: methionine; lysine; phenylalanine; histidine; threonine; tryptophan; and the branched-chain amino acids, leucine, isoleucine, and valine. In addition to these 9 amino acids, dogs also have a requirement for arginine. Cats have a requirement for the same essential amino acids as the dog, plus the amino-sulfonic acid taurine. | + | Amino acids are the structural components of proteins in all plants, animals and fungi. Amino acids are considered either '''indispensable (essential)''' or '''dispensable (non-essential)'''. Essential amino acids are those that are required pre-formed in the diet as the animal either lacks the metabolic pathway to synthesise the given amino acid or is unable to make sufficient quantities for growth and normal physiologic/biochemical functions. Non-essential amino acids are those that can be produced endogenously from available nitrogen and carbon sources. There are nine essential amino acids required by humans which are: [[Methionine and Cysteine - Nutrition|methionine]]; [[Lysine - Nutrition|lysine]]; [[Phenylalanine and Tyrosine - Nutrition|phenylalanine]]; [[Histidine - Nutrition|histidine]]; [[Threonine - Nutrition|threonine]]; [[Tryptophan - Nutrition|tryptophan]]; and the branched-chain amino acids, [[Branched-Chain Amino Acids - Nutrition|leucine, isoleucine, and valine]]. In addition to these 9 amino acids, dogs also have a requirement for [[Arginine - Nutrition|arginine]]. Cats have a requirement for the same essential amino acids as the dog, plus the amino-sulfonic acid [[Taurine - Nutrition|taurine]]. |
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− | In addition to their structural role in proteins, amino acids can be utilized as energy substrates during periods of fasting or starvation. Amino acids are able to provide a carbon skeleton for either glucose production or synthesise ketone bodies, or both. Exclusively gluconeogenic amino acids are arginine, histidine, methionine (+ cysteine), threonine, and valine; leucine and lysine are strictly ketogenic; and isoleucine, phenylalanine (+ tyrosine), and thryptophan are both gluconeogenic and ketogenic. Amino acids are also important components of biologically active compounds such as the neurotransmitters serotonin and catecholamine’s, nucleotides, nitric oxide and many others. | + | In addition to their '''structural role in proteins''', amino acids can be utilized as '''energy substrates during periods of fasting or starvation'''. Amino acids are able to provide a carbon skeleton for either glucose production or synthesise ketone bodies, or both. |
| + | *Exclusively '''gluconeogenic amino acids''': |
| + | **[[Arginine - Nutrition|arginine]] |
| + | **[[Histidine - Nutrition|histidine]] |
| + | **[[Methionine and Cysteine - Nutrition|methionine (+ cysteine)]] |
| + | **[[Threonine - Nutrition|threonine]] |
| + | **[[valine]] |
| + | *Strictly '''ketogenic''': |
| + | **[[leucine]] |
| + | **[[lysine - Nutrition|lysine]] |
| + | *Both '''gluconeogenic and ketogenic''': |
| + | **[[isoleucine]] |
| + | **[[Phenylalanine and Tyrosine - Nutrition|phenylalanine (+ tyrosine)]] |
| + | **[[Tryptophan - Nutrition|thryptophan]] |
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| + | Amino acids are also important components of biologically active compounds such as the [[Neurotransmitters - Anatomy & Physiology|neurotransmitters]] serotonin and catecholamine’s, nucleotides, nitric oxide and many others. |
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| ==Additional Reading== | | ==Additional Reading== |
| #National Research Council (NRC). Protein and Amino Acids. In Nutrient Requirements for Dogs and Cats. 2006 Washington, DC: National Academies Press p.111-120. | | #National Research Council (NRC). Protein and Amino Acids. In Nutrient Requirements for Dogs and Cats. 2006 Washington, DC: National Academies Press p.111-120. |
| #Case LP, et al. Protein Requirements. In Canine and Feline Nutrition: A resource for Companion Animal Professionals. 2011 Third Ed. St. Louis: Mosby p.95-106. | | #Case LP, et al. Protein Requirements. In Canine and Feline Nutrition: A resource for Companion Animal Professionals. 2011 Third Ed. St. Louis: Mosby p.95-106. |
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| + | <br> |
| + | {{Reviewed Nutrition 1 |
| + | |date = 22 May 2015}} |
| + | {{Waltham}} |
| + | {{OpenPages}} |
| + | [[Category:Amino Acids]] |