12-Proteins+_+Enzymes

12-Proteins+_+Enzymes - FST10 GMS 2011 Food Proteins...

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Unformatted text preview: FST10 GMS 2011 Food Proteins & Enzymes A Brief Overview FST10 GMS 2011 Outline of lecture topics... ! Basic protein structure ! Protein function(s) & enzymes ! Protein quality ! Essential amino acids ! Limiting amino acids ! Improving protein quality FST10 GMS 2011 What are Proteins? ! As food ! source of amino acids ! source of calories (energy) ! In the body ! structural ! contractile/motion ! enzymes ! enzyme inhibitors ! O 2 transport/binding good ! receptors ! transporters ! antibodies ! electron carriers ! hormones (some) FST10 GMS 2011 Calories - Energy Units ! Amount of heat reqd to raise 1 g of water from 14C to 15C = 1 c alorie ! 1 C alorie = 1 kcal = 1000 calories (or 1 big calorie = 1000 small calories) ! Can be converted to electron volts, Joules, horsepower, volts ... any other energy unit ! Energy is stored metabolically as polysaccharide (glycogen) or fat (triglycerides) - Last lectures FST10 GMS 2011 Energy content per gram ! Protein ! digestible carbohydrates ! fats and oils ! indigestible carbohydrate (fiber) ! water ! minerals 4.5 Cal/g 4.5 9 FST10 GMS 2011 Hold on thar pardner This slide set contains much more information than is necessary for exams in FST10 Concentrate on the lecture explanations, not on this details in the slide set. You do not need to memorize any chemical structures! FST10 GMS 2011 Amino Acids Protein Building Blocks ! All proteins are composed of amino acids ! [All are !-amino acids (except proline), but this is FST100 level only] ! Only 20 amino acids commonly occur in proteins ! They differ by the R on the structure H 2 NCCOOH I H I R FST10 GMS 2011 Amino Acids Protein Building Blocks ! So, aas are composed of: ! An acid part C COOH I H FST10 GMS 2011 Amino Acids Protein Building Blocks ! So, aas are composed of: ! An acid part ! An amino part CCOOH I H I H 2 N FST10 GMS 2011 Amino Acids Protein Building Blocks ! So, aas are composed of: ! An acid part ! An amino part ! And another part R CCOOH I H I R H 2 N FST10 GMS 2011 Amino Acids Protein Building Blocks ! So, aas are composed of: ! An acid part ! An amino part ! And another part R ! There are 20 common R parts that are different and make the differences among the amino acids ! Occasionally, you find extra oddball amino acids CCOOH I H I R H 2 N FST10 GMS 2011 Basic protein structure ! Composed of small amino acids (~20) ! Linked together to form large molecules ! Linear chains, never branched FST10 GMS 2011 Shape of proteins ! There are 3 main types of protein shapes or structures ! Fibrous proteins: ! Insoluble in water, structural (muscle, connective tissue, hair) !...
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12-Proteins+_+Enzymes - FST10 GMS 2011 Food Proteins...

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