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Protein structure - PowerPoint PPT Presentation


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Protein structure. Atoms:. Oxygen. Amino Acids. O. Hydrogen. H. Carbon. Protein. C. Nitrogen. N. Protein structure. Atoms:. Oxygen. Amino Acids. N. O. H. H. C. O. H. C. O. N. Hydrogen. H. Carbon. Protein. N. N. O. N. O. H. H. H. N. H. O. H. C. H. O. C.

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Presentation Transcript
slide1

Protein structure

Atoms:

Oxygen

Amino Acids

O

Hydrogen

H

Carbon

Protein

C

Nitrogen

N

slide2

Protein structure

Atoms:

Oxygen

Amino Acids

N

O

H

H

C

O

H

C

O

N

Hydrogen

H

Carbon

Protein

N

N

O

N

O

H

H

H

N

H

O

H

C

H

O

C

H

O

H

H

O

C

H

C

C

O

C

H

C

O

H

C

N

N

N

N

C

Nitrogen

N

slide3

Proteins

proteins are unbranched repeating chains of amino acids (a.a)

an a.a. are small molecules consisting of an amino group, a carboxyl 

 
group, a carbon and hydrogen atom and a side chain

the structure of the side chain distinguishes it from the other 20 a.a.

Foods: meat, fish, milk, cheese, peanuts, dry beans, peas

slide5

What does the body do with the

Proteins we eat?

Our digestive system breaks down food into

individual molecules for our body to use.

What does the body do with Protein?

Proteins are broken down into amino acids; the body 
rearranges amino acids to create our own proteins. 
Use proteins for an energy source when other 
nutrients are low.

Click to reveal

slide6

Proteins

There are 20 amino acids.

8 are considered essential, obtained in diet.

Individuals should not rely on protein as an energy source since

proteins cannot be stored in the same manner as carbs - if the body

demands a.a. it will begin to digest proteins leading to serious

tissue damage.

Click to reveal

slide7

What is the process the body uses to 
create the energy we need?

Cellular Respiration

Check your answer here

O2 + C6H12O6 CO2 + H2O + energy

slide8

Denatured Proteins

Proteins may lose their shape if they are subjected to high

temperatures (generally over 40 0C) or exposed to acidic, basic, salty conditions

A denatured protein cannot carry out its biological functions

 Dangerous

 - fevers denature critical enzymes in the brain, leading to seizures and possibly death

Click to reveal

slide9

1

Testing for Proteins

Copy

- Biuret reagent reacts with the bonds that join amino acids together

- if protein is present solution will react with Biuret's and change colour

to violet

slide10

Homework

pg. 278 #1, 2

pg. 280 #1~3

pg. 343 #1~3

slide11

Denaturation

Proteins may lose their shape if they are subjected to high 
temperatures (generally over 40 0C) or exposed to acidic, basic, salty conditions

A denatured protein cannot carry out its biological functions

 Dangerous

 - fevers denature critical enzymes in the brain, leading to

seizures and possibly death

 Helpful

 - curing meat in salt denatures the enzymes in bacteria

  that would cause it to spoil

 - temporarily straightening hair

 - chewing meat