October 29, 2020, 03:29:56 PM
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Topic: D- and L- configuration of amino acids  (Read 248 times)

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Offline tortillazilla

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D- and L- configuration of amino acids
« on: October 15, 2020, 11:39:39 PM »
Hello! I'm still confused about how the D- and L- configuration of amino acids are determined. Some references say that counterclockwise CORN is L- and clockwise CORN is D-, while some sources say otherwise.

I tried naming the oligopeptide in the photo and came up with L-phenylalanyl-L-seryl-D-cysteinyl-D-tryptophan. Can someone tell me if this is correct? Thank you so much!

Offline Babcock_Hall

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Re: D- and L- configuration of amino acids
« Reply #1 on: October 16, 2020, 10:08:08 AM »
I am not familiar with the acronym CORN.  The L,D system is based on L and D glyceraldehyde, and for the amino acids there is not a perfect correlation between the L,D system and the R,S system.  I did not check all of the configurations, but I disagree with your assignment of cysteine.
« Last Edit: October 16, 2020, 10:45:53 AM by Babcock_Hall »

Offline tortillazilla

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Re: D- and L- configuration of amino acids
« Reply #2 on: October 17, 2020, 08:34:21 AM »
Ooh, totally missed that. Thank you so much!

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