Is Protein Structure Handedness Consistent?

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Protein structures are primarily right-handed, and natural proteins in the body are expected to follow this pattern. However, there are specific structures, like coiled coils, that exhibit left-handed characteristics. The confusion arises from the coiling of right-handed alpha-helices into a left-handed supercoil, which is a common structural feature. Clarification is needed regarding how these helices interact and their handedness. Overall, while right-handedness is predominant, certain structural formations can introduce left-handed elements.
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Proteins

Are protein structures always right-handed??
 
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luckymango said:
Are protein structures always right-handed??

The natural ones are
 
So does that mean that there won't be any left-handed proteins in our bodies?
 
No, there shouldn't
 
I'm a bit confused about the right-handed and left-handed proteins. I know that the coiled coil structure has to be left-handed but why wikipedia shows 2 right-handed coil instead?? Does it mean that a the 2 alpha-helix are right-handed but coiled together in a left-handed way??

I have attached a file of what I think a right-handed and left-handed should be.

Below is the url for wikipedia:
http://en.wikipedia.org/wiki/Coiled_coil
 

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I'm really not quite sure what you're asking here, the attached file shows a left handed helix on the left and a right handed one on the right.
 
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