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Tryptophan (abbreviated as Trp or W) is one of the 20 standard amino acids, as well as an essential amino acid in the human diet. It is encoded in genetic code as the codon UGG. Only the L-stereoisomer of tryptophan is used in structural or enzyme proteins, but the D-stereoisomer is occasionally found in naturally produced peptides (for example, the marine venom peptide contryphan). The distinguishing structural characteristic of tryptophan is that it contains an indole functional group.

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Wikipedia about tryptophan

Tryptophan (abbreviated as Trp or W) is one of the 20 standard amino acids, as well as an essential amino acid in the human diet. It is encoded in genetic code as the codon UGG. Only the L-stereoisomer of tryptophan is used in structural or enzyme proteins, but the D-stereoisomer is occasionally found in naturally produced peptides (for example, the marine venom peptide contryphan). The distinguishing structural characteristic of tryptophan is that it contains an indole functional group.

Isolation

The isolation of tryptophan was first reported by Sir Frederick Hopkins in 1901 through hydrolysis of casein. From 600 grams of crude casein one obtains 4-8 grams of tryptophan.

Biosynthesis and industrial production

Plants and microorganisms commonly synthesize tryptophan from shikimic acid or anthranilate. The latter condenses with phosphoribosylpyrophosphate (PRPP), generating pyrophosphate as a by-product. After ring opening of the ribose moiety and following reductive decarboxylation, indole-3-glycerinephosphate is produced, which in turn is transformed into indole. In the last step, tryptophan synthase catalyzes the formation of tryptophan from indole and the amino acid, serine. The industrial production of tryptophan is also biosynthetic and is based on the fermentation of serine and indole using either wild-type or genetically modified E. coli. The conversion is catalyzed by the enzyme tryptophan synthase.

Function

Tryptophan%20metabolism.png

  • Serotonin (a neurotransmitter), synthesized via tryptophan hydroxylase. Serotonin, in turn, can be converted to melatonin (a neurohormone), via N-acetyltransferase and 5-hydroxyindole-O-methyltransferase activities.
  • Niacin is synthesized from tryptophan via kynurenine and quinolinic acids as key biosynthetic intermediates.

The disorder Fructose Malabsorption causes improper absorption of tryptophan in the intestine, reduced levels of tryptophan in the blood and depression.

In bacteria that synthesize tryptophan, high cellular levels of this amino acid activate a repressor protein, which binds to the trp operon. Fact: date=October 2007 Binding of this repressor to the tryptophan operon prevents transcription of downstream DNA that codes for the enzymes involved in the biosynthesis of tryptophan. So high levels of tryptophan prevent tryptophan synthesis through a negative feedback loop and, when the cell's tryptophan levels are reduced, transcription from the trp operon resumes. The genetic organisation of the trp operon thus permits tightly regulated and rapid responses to changes in the cell's internal and external tryptophan levels.

Search results for Tryptophan

Absolute L-Tryptophan™

Certified Vegetarian L-Tryptophan: 120 - 500 mg Capsules a super value so ... Tryptophan taken orally can convert into the calming neurotransmitter serotonin ...www.caoh.org/l-tryptophan.html

Is There Something in Turkey That Makes You Sleepy? - HowStuffWorks

Explains how tryptophan, which is found in turkey, can affect the body but suggests that heavy meals, not tryptophan, make you sleepy.www.howstuffworks.com/question519.htm

The FDA Ban of L-Tryptophan: Politics, Profits and Prozac

1995 article by Dean Manders arguing that the ban is based on support for pharaceutical companies rather than good science.www.ceri.com/trypto.htm

Tryptophan supplement : by Ray Sahelian, M.D., tryptophan for ...

tryptophan for depression tryptophan is in food, tryptophan side effects, tryptophan sleep ... Tryptophan is formed by a fermentation process in a lab. ...www.raysahelian.com/tryptophan.html

Erowid Tryptophan Vault

Information on Tryptophan including research, legislation, media coverage, bibliography and lots of links. ... Notes on Tryptophan & Health Problems. More ...www.erowid.org/smarts/tryptophan/

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News about Tryptophan

Vitamin B-6 important for overall health

New Haven RegisterDear Dr. Gott: I am an 82-year-old lady who wants to praise the vitamin B-6 that I take daily. A year ago, the fingers of my right hand were numb, and I had a terrible time picking up small objects. My son said a friend had a wrist problem, and, after taking B-6, it went away. I tried it, and my fingers are just fine. I’ve been clear for more than a year now.http://www.nhregister.com/articles/2008/10/03/news/2docthur....

Ask Dr. Gott: Vitamin B-6 cures numbness in fingers B-6 eases numbness in fingers

The Monterey County HeraldDear Dr. Gott: I am an 82-year-old lady who wants to praise the vitamin B-6 that I take daily. A year ago, the fingers of my right hand were numb, and I had a terrible time picking up small objects. My son said a friend had a wrist problem, and, after taking B-6, it went away.http://www.montereyherald.com/ci_10617001?source=rss

B-6 cures numbness in fingers

Erie Times-NewsQ I am an 82-year-old lady who wants to praise the vitamin B-6 that I take daily. A year ago, the fingers of my right hand were numb, and I had a terrible time picking up small objects.http://www.goerie.com/apps/pbcs.dll/article?AID=/20081002/LI...

News about Tryptophan

Drugs & Medications - Sinemet Oral

WebMD ... g., tricyclics such as amitriptyline/nortriptyline), antipsychotics (e.g., chlorpromazine, thioridazine, risperidone), metoclopramide, phenytoin, papaverine, certain sedatives (e.g., benzodiazepines such as chlordiazepoxide/diazepam), tryptophan (e.g ... http://www.webmd.com/drugs/drug-6591-Sinemet+Oral.aspx?drugi...

Turkey talk

The ObserverIn order to have that affect, L-tryptophan has to be taken on an empty stomach without any other amino acids. Safety first Handle raw poultry correctly, for the safety of you and your family, says Health Canada. Always store your bird in the fridge ... http://www.theobserver.ca/ArticleDisplay.aspx?e=1242061&

Hawks fight for 11th straight

North Bay NuggetWith the 1,602 in Memorial Gardens slowly falling under the spell of Thanksgiving dinner through 40 minutes of play, they shook off the effects of tryptophan when a shoulder-to-head hit on Skyhawks centre Brad Hummel led to a scuffle between Matt ... http://www.nugget.ca/ArticleDisplay.aspx?e=1244768

TheStar.com | Ideas | 10 things we learned this week

Toronto Star100 grams of Swiss cheese contains more of the "natural sedative" tryptophan than 100 grams of turkey does. ( eatturkey.com ) • A nervous disorder called "tetanic torticollar spasms" can cause turkeys to stare at the sky "for 30 seconds or more at a ... http://www.thestar.com/sciencetech/Ideas/article/516159

7 Common Medical Myths Debunked

MedicineNet.comReality: Turkey isn't all that rich in tryptophan, the chemical linked to sleepiness after eating turkey. But eating a big, decadent meal can cause sleepiness, even if turkey isn't on the menu. SOURCES: Vreeman, R. BMJ, Dec. 22-29, 2007; vol 335: pp ... http://www.medicinenet.com/script/main/art.asp?articlekey=85...

Search results for Tryptophan

Tryptophan supplement : by Ray Sahelian, M.D., tryptophan for ...

tryptophan for depression tryptophan is in food, tryptophan side effects, tryptophan sleep ... Tryptophan or L Tryptophan, by Ray Sahelian, M.D. From L-Tryptophan to Melatonin - L ... http://www.raysahelian.com/tryptophan.html

Erowid Tryptophan Vault

Information on Tryptophan including research, legislation, media coverage, bibliography and lots of links.http://www.erowid.org/smarts/tryptophan/

tryptophan definition of tryptophan in the Free Online Encyclopedia.

tryptophan (trĭp`təfăn), organic compound, one of the 20 amino acids amino acid (əmē`nō)..... Click the link for more information. commonly found in animal proteins.http://encyclopedia2.thefreedictionary.com/tryptophan

WHFoods: tryptophan

Non-profit foundation providing reliable, scientifically accurate, personalized information for convenient and enjoyable healthy eating.http://www.whfoods.com/genpage.php?tname=nutrient&dbid=103

MedlinePlus Medical Encyclopedia: Tryptophan

Definition Return to top. Tryptophan is an amino acid necessary for normal growth in infants and for nitrogen balance in adults. It is an essential amino acid, which means your ... http://www.nlm.nih.gov/medlineplus/ency/article/002332.htm
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The Made from the king of fruit, Durian. The fruit is loaded with Tryptophan which increases seratonin levels in the brain, thus enhancing mood. I call this the "Durian Buzz"....Flash - Video

What You Ought To Know: Turkey Day

What You Ought To Know: Turkey DayMost everyone knows the origins of Thanksgiving. Pilgrims, Native Americans and really severe winter. But did you know that turkey contains Tryptophan...QuickTime - Video

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Answers for Tryptophan

sweetgurl_16

Since a tryptophan is a nutritionally essential aminoacid, what can be said of the nutritional value?

sweetgurl_16Household gelatin comes in the form of sheets, granules or as powder. Instant types can be added to the food as they are; others need to be soaked in water beforehand. Special kinds of gelatin are ...
Is it Friday yet?

When you eat turkey does the tryptophan really make you tired?

Is it Friday yet?No Turkey does contain tryptophan, an amino acid which is a natural sedative. But tryptophan doesn't act on the brain unless it is taken on an empty stomach with no protein present, and the amount go...
Jaisonda

What breakfast foods are high in tryptophan?

JaisondaHere is a website that lists 999 foods with the highest ratios of Tryptophan to Isoleucine. Just taking a quick peek raisins are very high on the list. Hope this list helps.
♥♪♫☺♫♪♥

What are the two enzymes along with vitamin B6 that participate in the synthesis of tryptophan into serotonin?

♥♪♫☺♫♪♥1. tryptophan hydroxylase 2. 5-hydroxytryptophan decarboxylase Tryptophan becomes 5-hydroxytryptophan under the influence of tryptophan hydroxylase. Then 5-hydroxytryptophan is decarboxylated ...
i got sole

what are some good tryptophan and b-complex brands?

i got soleI'd recommend tryptophan rather than 5-htp. Serotonin controls peristalsis as well as depression. Tryptophan doesn't affect that as much as 5-htp will. If tryptophan makes you sleepy, you might als...

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