Protein Recap. Protein Syllabus Draw the general amino acid structure.

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Presentation transcript:

Protein Recap

Protein Syllabus

Draw the general amino acid structure

What bond joins amino acids together?

Peptide Bond

What type of reaction forms a peptide bond?

Condensation

What type of reaction breaks a peptide bond?

Hydrolysis

Draw a dipeptide, label the peptide bond

What are the 4 levels of protein structure?

Primary Secondary Tertiary Quaternary

What are the 4 types of bonds involved in holding protein shape?

Hydrophobic & hydrophilic interactions Ionic bonds Hydrogen bonds Disulphide bonds

What is a conjugated protein?

Globular protein with a prosthetic group

What is haemoglobin’s structure?

Globular Conjugated 4 polypeptide chains Inorganic haem group

What is haemoglobin’s function?

Carry oxygen

What is a named enzyme’s structure?

Globular Active Site Hydrophobic and philic interactions create tertiary structure E.g. Amylase 3 domains Alpha helixes

What is a named enzyme’s function?

Amylase Digestion of carbohydrates specifically starch

What is insulin’s structure?

Two different types of peptide chains. Chain A has 21 amino acids Chain B has 30 amino acids Contain alpha helices 3 disulphide bridges to keep the two chains together

What is insulin’s function?

Lowers blood glucose Binds to target cells Trigger uptake of glycogen, metabolism of glucose

What are the properties and function of keratin?

Strong Found in hair, skin & nails Large amounts of cysteine Lots of strong disulfide bonds Less disulfide bonds means more flexible

What are the properties and function of collagen?

Strong 3 polypeptides wound together Rope like structure Triple helix Hydrogen bonded Flexible Every 3 rd amino acid is glycine Small Closely packed when wound together High amounts of proline and hydroxyproline Repel each other, adding stability

What are the properties and function of elastin?

To create large, stable, insoluble molecule Can stretch and relax Lots of soluble tropelastin molecules cross linked Have alternating areas of hydrophobic and lysine-rich