Guest guest Posted June 27, 2005 Report Share Posted June 27, 2005 > Greetings, > > Can anyone tell me what is L-Tryosine, and what is it used for? > Any known side-effects? > > Thanks, > Pratick > >Pratick, L-Tyrosine is an amino acid and i believe a pre-cursor to a thyroid hormone, or the thyroid needs L-tyrosine, or something like that. since it's in food, there shouldn't be any side effects. that's about as much as i can tell you. laura in nj Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 27, 2005 Report Share Posted June 27, 2005 On 6/27/05, Suze Fisher <s.fisher22@...> wrote: > > Re: What is L-Tryosine? > > > > > >>Pratick, L-Tyrosine is an amino acid and i believe a pre-cursor to a > >thyroid hormone, or the thyroid needs L-tyrosine, or something like > >that. > > It's the " T " in " T3 " and " T4 " :-) Hmm... T3 is also called " triiodothyronine " and T4 is also called " thyroxine " or " tetraiodothyronine. " The " T " in TBG is " thyroxine-binding globulin " The " idodotyrosines " which essentially could be called T1 and T2 but aren't, are not abreviated as T[n], so I don't think the " T " stands for tyrosine. In all the cases where it is abreviated, the root is " thyro-, " not " tyro-, " which I assume refers to the thyroid itself. The number following refers to the number of iodines. http://www.merck.com/mrkshared/mmanual/figures/8fig1.jsp Chris Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 27, 2005 Report Share Posted June 27, 2005 > > Re: What is L-Tryosine? > > > > > >>Pratick, L-Tyrosine is an amino acid and i believe a pre-cursor to a > >thyroid hormone, or the thyroid needs L-tyrosine, or something like > >that. > > It's the " T " in " T3 " and " T4 " :-) > i always assumed the 'T' stood for 'thyroid hormone' or thyroxin or whatever it's called. never assume... laura in nj Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 27, 2005 Report Share Posted June 27, 2005 > >Pratick, L-Tyrosine is an amino acid and i believe a pre-cursor to a > > thyroid hormone, or the thyroid needs L-tyrosine, or something like > > that. > > > > since it's in food, there shouldn't be any side effects. > > Thanks, do you know which foods contain this amino acid? > > -Pratick > > Pratick, amino acids are what make up protein, so i think pretty much all the animal proteins have all the amino acids, so you would be safe with any animal protein. i'm sure someone here will answer you more specifically. laura in nj Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 27, 2005 Report Share Posted June 27, 2005 On 6/27/05, Suze Fisher <s.fisher22@...> wrote: > Ross wrote in " The Mood Cure " that the " T " in T3 and T4 is Tyrosine. > And she confirmed that the " 3 " and " 4 " refer to the number of iodine > molecules attached to it. I'm suggesting that she's wrong, then-- for the reasons I stated earlier and will expand on below. > I think this site explains it similarly: > > " There are two main thyroid hormones: Triiodothironine (T3) 20% and > thyroxine (T4) 80%. Each thyroid hormone is made up of tyrosine (protein) > surrounded by four (T4) or three (T3) iodines. " > http://72.14.207.104/search?q=cache:XUQ4OcJpyEUJ:www.testmyhormones.com/thyr > oid_panel.htm+tyrosine+T3+T4 & hl=en I don't see anything in this (somewhat inaccurate) paragraph that supports the assertion that the " T " stands for tyrosine. It says nothing about the etiology of the abbreviations, and it doesn't discuss the iodotyrosines-- as I pointed out before, monoiodotyrosine and diiodotyrosine, which *are* iodized tyrosines, reflected in their names which *do* contain " -tyrosine " , are *not* abbreviated T1 and T2 respectively. More importantly, T3 and T4 are NOT simply tyrosine iodized 3 and 4 times respectively. They consist of a diiodotyrosine (tyrosine with two iodines), joined to the aromatic portion of the side chain of a monoiodotyrosine (yielding three total iodines) or a diiodotyrosine (yielding four total iodines), respectively. These can NO LONGER be considered tyrosines which is why they are NOT called tyrosines. It is only that the chemical ceases to be referred to as a tyrosine that it begins to be referred to with the abbreviation " T[n], " which is why it is my contention that the " T " refers to a mature and active thyroid hormone, which the iodotyrosines are NOT. They are merely building blocks of mature thyroid hormone. T3 and T4 cannot be considered tyrosines because they have two aromatic groups. This is a much greater difference in the side chain than other more subtle differences that distinguish different amino acids. For example, the difference between tyrosine and phenylalanine is the hydroxyl (OH) group on the end of the phenyl (aromatic, or benzene) group in the tyrosine. If the iodines were missing from T3 or T4, what would be left would not be tyrosine but a new amino acid that would need a new name. > Even though T3 and T4 have names that do not involve " tyrosine " nonetheless > " T3 " , for instance, is an abbreviation for " TYROSINE + 3 molecules of > iodine " . Hence, the " T " stands for tyrosine as I mentioned above. Only they don't have names that involve " tyrosine " precisely because they AREN'T " tyrosine + [n] atoms of iodine. " By the way, I thought the original description was suspicious based on memory which is why I pursued it further, but when I wrote this email I had to look at some books for the structural formulas because I had a hard time sorting through a lot of irrelevant material when I tried googling it. If you still have _Molecular Biology of the Cell_, you can look up throxine in the index, in my edition there's a picture on page 840. I think it also has a figure with all the amino acids but I looked at something else where I found them quicker. Chris Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 28, 2005 Report Share Posted June 28, 2005 On 6/28/05, Suze Fisher <s.fisher22@...> wrote: > Then what is the name of the mature and active thyroid hormone that " T " > stands for? Thyronine? So, " T3 " would mean Thyronine + 3 iodine molecules? I would abandon entirely the equation of Tn = [something] + n iodine. I would say that T stands for thyronine, or thyroid hormone, etc (or thyroxine-- all of them begin with T and are from the same root, derived from thyroid), and the number specifices the number of iodine atoms attached. " Thyronine " implies that there are already 3 or 4 iodine atoms attached, so the addition doesn't work. Rather, the number (I think it is usually subscripted, right?) specifies the form of thyronine-- either triiodo- or tetraiodo-. A side point-- they are atoms of iodine and not molecules of iodine. The entire T3 or T4 unit is a molecule, with constitutent nitrogen, oxygen, carbon, hydrogen, and iodine *atoms*. Chris Quote Link to comment Share on other sites More sharing options...
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