minor/major Amino acids

For discussing the functions of different structures of all organisms.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
piefke
Garter
Garter
Posts: 24
Joined: Tue Sep 18, 2007 8:41 am

minor/major Amino acids

Post by piefke » Mon Dec 14, 2009 12:06 pm

Hi everybody,

sometimes the amino acids are divided into the minor and major AA´s. But I don´t find any definition for minor and major amino acids... What are they?? :?

kolean
Coral
Coral
Posts: 345
Joined: Thu Jun 25, 2009 3:15 am

Post by kolean » Mon Dec 14, 2009 1:50 pm

Major amino acids are the main 20 amino acids that you learn in your textbooks, but there are hundreds of them (mostly modified major amino acids) and these are the minor ones.
http://www.imagerynet.com/amino/classification.html

Darby
Viper
Viper
Posts: 1278
Joined: Thu Mar 02, 2006 5:29 pm
Location: New York, USA

Post by Darby » Tue Dec 15, 2009 5:12 pm

I thought that the minor ones were the ones that were vary rarely used in human proteins and so weren't big dietary needs...but I could be wrong...

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Sat Dec 19, 2009 1:19 am

well darby what are you referring to? Humans require intake of 9 amino acids (the essential ones) because they can't make them - how much of them proteins use is not a factor. And considering how many proteins there are, I would think that amino acids are used at about the same rate, is there any info to prove the contrary?

I would have defined minor amino acids as amino acids that get incorporated into proteins as-is, like the 20 canonical amino acids. The two most well characterized are selenocysteine and pyrolysine, but I'm sure there are others. Of course, this is just my gut instinct, I don't know any books to pack this up
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

User avatar
JackBean
Inland Taipan
Inland Taipan
Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm

Re:

Post by JackBean » Sun Dec 20, 2009 11:28 pm

MrMistery wrote:well darby what are you referring to? Humans require intake of 9 amino acids (the essential ones) because they can't make them - how much of them proteins use is not a factor. And considering how many proteins there are, I would think that amino acids are used at about the same rate, is there any info to prove the contrary?

I don't think so. Such amino acids like methionine or tryptophane are used just rarely (I think), on the other hand, such like alanine and all these small amino acids (and of course some others too) are used moch more widespreadly.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

Darby
Viper
Viper
Posts: 1278
Joined: Thu Mar 02, 2006 5:29 pm
Location: New York, USA

Post by Darby » Thu Dec 24, 2009 4:22 pm

Apparently whether amino acids fall into the same "major / minor" categories as other nutrients is somewhat undecided and controversial.

I think what's being discussed here may be more semantic - essential/nonessential being used as a synonym for major / minor.

http://jn.nutrition.org/cgi/content/full/127/9/1842

http://journals.cambridge.org/action/di ... aid=800520

http://www.fao.org/docrep/MEETING/004/M ... 772E00.HTM

Post Reply

Who is online

Users browsing this forum: No registered users and 0 guests