- #1
sameeralord
- 662
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Ok as the title suggests I want to clear up my misunderstandings on protein structure.
1. When they say primary,secondary,tertiary and quarternary structure do they mean different stages of a protein. What I mean is do all proteins have a tertiary or quarternary structure and are primary,secondary structures simply stages of them before they became a protein. Or do some proteins remain in secondary or primary structure.
2. "Myoglobin is a single-chain globular protein of 153 amino acids, containing a heme (iron-containing porphyrin) prosthetic group in the center around which the remaining apoprotein folds. It has eight alpha helices and a hydrophobic core. "(wikipedia)
Does myoglobin have 8 different polypeptide helix chains joined or is it the same chain twisted to make 8 helixes. I thought one chain could only make one helix.
"Collagen contains three different polypeptide helixes joined together"
Does this make Collagen a quarternary structure. What is the basic difference between quaternary and tertiary structure. My understanding is that tertiary structure only has one chain twisted many ways and quaternary structure has two or more different polypeptide chains. Is this wrong?
Thanks a lot for taking your time to read this. If you could help me with these basics I would be very greatful. Thank you
1. When they say primary,secondary,tertiary and quarternary structure do they mean different stages of a protein. What I mean is do all proteins have a tertiary or quarternary structure and are primary,secondary structures simply stages of them before they became a protein. Or do some proteins remain in secondary or primary structure.
2. "Myoglobin is a single-chain globular protein of 153 amino acids, containing a heme (iron-containing porphyrin) prosthetic group in the center around which the remaining apoprotein folds. It has eight alpha helices and a hydrophobic core. "(wikipedia)
Does myoglobin have 8 different polypeptide helix chains joined or is it the same chain twisted to make 8 helixes. I thought one chain could only make one helix.
"Collagen contains three different polypeptide helixes joined together"
Does this make Collagen a quarternary structure. What is the basic difference between quaternary and tertiary structure. My understanding is that tertiary structure only has one chain twisted many ways and quaternary structure has two or more different polypeptide chains. Is this wrong?
Thanks a lot for taking your time to read this. If you could help me with these basics I would be very greatful. Thank you