Go to the following website: http://proteopedia.org/wiki/index.php/Introduction_
ID: 884826 • Letter: G
Question
Go to the following website: http://proteopedia.org/wiki/index.php/Introduction_to_protein_structure Read through the tutorial and click on the green hyperlinks at the website that correspond to the underlined green words below to see the image that illustrates the concept being described. Note that you can click and drag on the image to rotate it and view it from different angles. You can also zoom in and out on the image. Answer the following questions.
Intro primary structure
Can you determine the type of secondary structure illustrated? If so, what is it?
What is the sequence of this peptide?
secondary structure
Using this view, determine what type of secondary structure this peptide exhibits. Does the diagram represent all atoms of the peptide?
What does it represent?
go back to primary structure
Where are the amino acid R groups relative to the secondary structure?
hydrogen bonds
Hydrogen bonding occurs between what groups?
How many hydrogen bonds form per amino acid (look at the central amino acids)?
Pick an amino acid and determine how many amino acids after that it hydrogen bonds to. pack together and tertiary structure How many -helices are present in the single peptide chain shown?
quaternary structure
How many polypeptide chains make up the quaternary structure?
Explanation / Answer
1) Can you determine the type of secondary structure illustrated? If so, what is it?
The secondary structure is alpha helix .
2)What is the sequence of this peptide
The given protein is haemoglobin which have different sequence of amino acids, which vary from species to species.
3)Where are the amino acid R groups relative to the secondary structure?
the amino acid R-groups protrude out from the helically coiled polypeptide backbone
4)How many hydrogen bonds form per amino acid
An a-helix is stabilized by hydrogen bonds between backbone amino and carbonyl groups and those in the next turn of the helix
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