Please help with A.B.C questions about proteins according to this web: http://mm

Question

Please help with A.B.C questions about proteins according to this web:

http://mm.rcsb.org/ (my safari be able to open it after I change a few symbols now should work) please help.Thank you!!!!

A. Click on Pepsin (you’ll find it with the “Digestive Enzymes.”)

What is the function of Pepsin?

In the menu at the right – click Color > Chain. This view makes each protein strand a different color.

How many protein strands are present in pepsin?

Now click Color > Secondary Structure

This view displays different colors for different types of secondary structure. What secondary structure is represented by each color?

Pink/Red –

Yellow –

Gray –

Return to Color > Rainbow

This view traces the protein from one end to the other with ROYGBIV coloration; it can be helpful for following along the backbone of the protein.

Are parts of the protein that are near each other in the tertiarystructure always near each other in the primarystructure? How can you tell?

B. Click on Green Fluorescent Protein (you’ll find it near the bottom of the page; it is bright green) and answer the following questions.

What is the function of the Green Fluorescent Protein?

How many protein strands are present in Green Fluorescent Protein?

What types of secondary structure are present and how are they arranged?

C. Click on Prefoldin (you’ll find it with the “Protein Synthesis” proteins)and answer the following questions.

What is the function of the prefoldin protein?

How many protein strands are present in prefoldin?

What types of secondary structure are present and how are they arranged?

Explanation / Answer

A. The main function of pepsin is that it works as a protease - it breaks protein molecules into smaller peptides .

There are 9 protein strands , each measuring for 5 peptides .

These are - VAL, PHE, ILE, ASP, LEU, SER, THR, ALA, GLY. But VAL, PHE and ILE repeats itself . So there will be 12 in total.

Secondary structures -

No , the parts of protein near to each other in the tertiary structur is not as that near in primary structure . This is because temporary structures are formed by complexing the primary structure of proteins . For example, primary structures has proteins parts arrannged in a line , but the tertiary structure is like a wool ball , so the distance will be very less.

B.Green fluoroscent protein are the proteins that are present in the Aequorea victoria jellyfish and helps it to glow.

There are 12 protein strands present in green fluoroscnet protein.

two types of secondary structure are present - 11 strands are present as beta sheet structure and 1 strand has alpha helix structure.

C.Prefoldin conjugates with the chaperonin to form the chaperenon complex , and helps folding of nascent proteins correctly .

There are total six protein strands .

two types of secondary structures are present - 2 strands have alpha helix structure and 4 strands have beta sheet structures.

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