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Biology OCR A-Level Protein summary £2.99   Add to cart

Summary

Biology OCR A-Level Protein summary

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Hand Written Textbook Summary with A* content.

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  • October 9, 2023
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  • 2023/2024
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faithcortis
-" on
Carboxyl

Group,"
Amine
Group
Amino Acids :

- H H H
o

Hin 1 H2
o
I o o

I Hin I 1
H20
synthesis of peptides: a b
C - N Y +
C r -
-


C
-
-
C
H 1 H - H
I 1
I it I
levels of protein Structure :

Primary Structure Sequence of amino acids influences how the
ypol peptide folds
:




Secondary structure :
O,H and N interactions :
form hydrogen bonds -> Alpha helix or Beta pleated sheet

Tertiary Structure Folding of :
a protein into its final shape due to R
group interactions


Hydrophobic and hydrophilic interactions bonds
-
·


lonic


Hydrogen bonds Disulfide bonds
- -




Quaternary structure Tertiary interactions :
between different subunits



Globular proteins Compact Spherical proteins formed
water Soluble , by hydrophobic interactions
:



,


↳ ie insulin .




Conjugated proteins Globular proteins with prosthetic (non-protein) component sie Haem in
haemoglobin
:

a .






Haemoglobin :


Quaternary globular conjugated protein with two a and two B subunits
↳ iron 2+ binds with
reversibly Oxygen
·
Catalase :


Quaternary protein with 4 haem
prosthetic groups -> breaks down
hydrogen peroxide

Fibrous Proteins :



long insoluble molecules formed from small repetitive hydrophobic, ,
amino acids
·
Keratin :
fibrous protein in hair skin and nails
,




Contains large proportion of the
sulfur-containing amino acid Cysteine
·

a



many strong disulfide bonds
·





Strong , inflexible ,
insoluble
·


Elastin :

Fibrous protein in elastic fibers ->
walls of blood vessels

Quaternary formed from many tropoelastin
·


protein molecules

↳ Allow
expansion and recoil .




Collagen Fibrous protein Shin , tendons
ligaments
·

in connective tissues
:
- ,




·
Three polypeptides wound together forming a rope -> hydrogen bonding
↳ flexible
long strong , ,

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