Protein Structure Flashcards
How many types of amino acid ?
20
Name some type of amino acid
Serine, valine
What are the three main components of Protein structure ?
Amino group, R group and Carboxyl group .
- Alaine
- Argine
- Asparagine
- Aspartic Acid
- Cysteine
- Glutamic
- Histidine
- Glycine
- Isoleucine ,
- Leucine
- Lysine
- Ala, A
- Arg , R
- Asn, N
- Asp ,D
- Cys , C
- Glu , Q
- His , H
- Gly, G
- ILLE , I
- Leu , L
- Lys k
What are some of the functions of Protein ?
Catalysing chemical reactions
Synthesising /replacing DNA
Receiving and sending chemical signals
Providing structural support
What type of R side chain does Valine have and how does it react ?
Its hydrocarbon
Determines how they react , they don’t have a polarity so therefore its hydrophobic side chain .They define shape and structure .
How does the R group on Serine react ?
Alcohol group
Oxygen are electronegative and hydrogen have a low electron negativity causing a polarity .In which becomes hydrophilic.
What occurs during a aqueous solution ?
Side chains which are hydrophobic want to be inside and hydrophilic want to be on the outside .
What happens during peptide formation ?
Alpha carbon is going to be bonded to a hydrogen /Side chain , forming a water molecules on a different diagram .
Nitrogen forms a bond carbon using lone pair.
What is a DI-peptide bond ?
Have two amino acids which they can add more chains forming a polypeptide chains
What process occurs during a polypeptide/and peptide linkage ?
Dehydration synthesis and condensation .
What are the Primary structure and how do they function ?
Its a sequence of amino acids
ALA-GLY-TY
The DNA is coding for the order of amino acids .This type of structure is how polypeptide bonds are formed /Identity of side chains and the sequence they are found in
What about secondary structures ?
They are the interaction within the backbone .
a-helix and B-sheet.
Beta sheets consist of beta strands (also β-strand) connected laterally by at least two or three backbone hydrogen bonds, forming a generally twisted, pleated sheet.
A β-strand is a stretch of polypeptide chain typically 3 to 10 amino acids long with backbone in an extended conformation.
Always between the carboncy and nitrogen there is always peptide bonds which occur .
Occurs always between the carbony C and Nitrogen there is always peptide bonds which occur .
The beta sheet is stabilized by hydrogen bonds between the carbonyl oxygen of an amino acid in one strand and the backbone nitrogen of a second amino acid in another strand. Beta sheets can be either parallel or anti-parallel.
What are the types of secondary structures ?
Parallel
They are interactions within the backbone .Nitrogen is electronegative .Hydrogen smaller electronegative in which they have a position in which oxygen becomes partial negative
Not circle one
Its repeats forming a beta pleated sheet
Both of the side chains interacting a parallel .Going in the same direction
The “R group” can mainly rotate .
N-C
Other type of Secondary Structure
N-C
C-N
Anti-parallel beta pleated sheet
Circle
Nitrogen ,alpha carbon ,carbonyl carbon right side
Left side - carbonyl ,hydrogen bonds ,carbon , alpha carbon ,nitrogen going opposite direction .
However they are going in different directions .
Allowing each residue to interact with other residue .To adopt lowest electron level.
A-helix
Backbone is going helical structure .
Hydrogen bonds .giving it a cyclical structure
Interaction between backbone and secondary structure .