Gene, Enzyme

Genetics as it applies to evolution, molecular biology, and medical aspects.

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ngfok
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Gene, Enzyme

Post by ngfok » Thu Mar 16, 2006 12:33 am

Is enzyme a gene? Cause i read this article. And i don't know what the gene is. "A gene taken from daffodil is responsible for producing the enzyme phytoene synthase. The gene is controlled by a rice promoter and is only expressed in the endosperm. phytoene synthase catalyzes the reaction that convertss two GGDP molecules to phytoene, the first step in provitamin - A synthesis." IS the gene Phytoene Synthase? is it both enzyme and a gene.

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Khaiy
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Post by Khaiy » Thu Mar 16, 2006 3:09 am

No, not quite. The way that genes work is that each particular gene codes for a particular protein. Enzymes are proteins that are shaped a certain way, so that they can operate on particular substrates. The gene that the article described is the one that codes for the enzyme phytoene synthase.

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asutoshsahu
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Post by asutoshsahu » Thu Mar 16, 2006 6:39 am

Hey the "one gene one enzyme concept" proposed by Beedle & Tatum has been discarded.

The new concept is "one cistron one enzyme"

This means one cistron (the functional part of gene) codes for one enzyme.

I think this will help you better

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MrMistery
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Post by MrMistery » Thu Mar 16, 2006 8:07 pm

Doesn't one cistron code for a particular polipeptide chain? If so, more cistrons can code for one enzyme, cause some enzymes and other proteins have more than one polipeptide chain(cuarternary structure)
"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

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Khaiy
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Post by Khaiy » Thu Mar 16, 2006 10:27 pm

I wasn't being literal, it's just an easier illustration with the one to one idea. Although you're right, I really should have been clearer, because what I wrote was wrong :p

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