Leucine Amino Acid

Leucine Amino Acid questions and answers

Learn more about Leucine Amino Acid at Diet & Health.net.

Q: Occurrence frequency of Leucine residues is highest among other amino acids residues of any protein. Why so?


A: Leucine is a hydrophobic amino acid. The way I see the structure, it has hydrophobic groups at one extremity and an OH group on the other hand. It is highly used for hydrophobic interactions. Leucine is a non-polar amino acid. Non-polar amino acids dominate in proteins because the surface only is made-up of polar amino-acids while non-polar amino acids occupy the core of the protein which is away from water. Also, leucine forms a structural motif in proteins called Leucine zippers which are a heptad of amino acids arranged in a zig-zag formation. This helps proteins having this motif to bind to DNA. Transcription factors are known to have a leu-zipper motif.

Q: Histidine, glutamic acid, threonine, or leucine?
a. Which would interact best with lipids? b. Be folded up deep in the center of a protein that is generally in an aqueous environment (surrounded by water)? c. Which would interact best with the Rgroup of the amino acid Aspartic acid? d. Which (more than one answer) could interact well with water? e. which would mostly likely bind cations?

A: For b and d, the answer would be the non-polar (hydrophobic, do not interact well with water) amino acids. Non-polar amino acids are: Alanine Valine Leucine Isoleusine Proline Methionine Phenylalanine Trytophan Take your pick. c, e. Since Aspartic Acid is a Acidic (-vely charged) amino acid, it'll interact better with Basic (+vely charged) aa, right? So it'll be either Lysine, Arginine or Histidine.

Q: i have amino acid 50% from soya origin. it can be used for animal feed or human use?
50% AMINO ACID POWDER (SOYA PROTIEN HYDROLYSATE – 100% WATER SOLUBLE) Suitable for Fertilizer & Animal Feed Amino Acid is a Bio-organic nutritional product derived from vegetable source (SOYA) required for plant growth promotion and for higher yields. It promotes hormonal activity and induces their synthesis resulting into flowering and fruit setting. It also reduces the flower and fruit drop caused by hormonal imbalance. It enhances nutritional uptake and their utilization which improves the colour, size, luster and taste of fruits. It also improves keeping quality. It is an ideal product to resist from adverse conditions. The foliar application enables the plants to receive direct benefits from naturally balanced nutrients/ growth stimulating substances when they are needed by the plants especially at the time of stage differentiation. It is extracted from naturally occurring cereal protein source, the most biologically active for crops as a source of protein. Mode of Action •Promotes uptake of macro and micro nutrients. •Promotes enzymic activity by acting as natural stimulant •Stimulates protein synthesis as it contains Amino Acids which are Building Blocks. •Induces Flowering and Fruit set related hormones. •Improves the efficiency of the pesticides and fungicides with synergism. •Provides drought resistance by its direct action. Direct Benefits •Helps in better crop spread. •Induces flowering and reduces flower drop. •Improves fruit set and reduces fruit drop. •Improves fruit size, quality and colour. •Advaces maturity and increases the keeping quality. •Gives drought resistance. •Thereby it increases to significant extent. Application: For Foliar Application: 1 Gram/ 1 Litre of Water Soil Aplication: Dilute it as 1:3000-4000 in water. It can be mixed with most nutrient solutions and pesticides. Nevertheless make a miscibility test before first application. ANALYSIS OF AMINO ACID POWDER – 50% % (w/w) AppearanceYellow Powder L-Threonine ≈3.56 L-Aspartic ≈3.45 L-Serine ≈4.49 L-Glutamin acid ≈9.12 L-Proline ≈3.50 L-Glysine ≈2.43 L-Alainie ≈2.20 L-Cystine ≈2.45 L-Valine ≈3.10 L-Methionine ≈0.23 L-Isoleucine ≈1.70 L-Leucine ≈2.80 L-Tyrosine ≈1.02 L-Pheinylalanine　 ≈1.78 L-Lysine ≈2.30 L-Histidine ≈0.90 L-Arginine ≈5.20 Loss on Drying ≈2.00 NH CL≈45.00 Ash≈1.00 Total Amino AcidAbove 50%

A: For animal feed or fertilization (right on the label). You can purchase amino acid supplements at Health Food stores that are safe for Human use. Good luck!

Q: What do the COSY diagrams look like for the 20 amino acids?
Especially leucine, serine, glutamine, aspartic acid, glutamic acid and tryptophan.

A: here is the site that you need, and it will give you all the answers: (it has a link on the right side that says "20 amino acids" and it will give you the link to their corresponding diagrams) http://images.google.com/imgres?imgurl=http://www.chem4kids.com/files/aminoacids/art/leucine.gif&imgrefurl=http://www.chem4kids.com/files/aminoacids/leucine.html&h=225&w=440&sz=10&hl=en&start=1&tbnid=8BEnZZ3r6uejeM:&tbnh=65&tbnw=127&prev=/images%3Fq%3Dleucine%2B%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DN

Q: What's the condense structrual formula of these amino acids?
Alanine Arginine Asparagine Aspartic Acid Cysteine Glutamine Glutamine Acid Glycine Histidine Isoleucine Leucine Lysine Methionine Phenylalanine Proline Serine Threonine Tryptophan Tyrosine Valine

A: http://en.wikipedia.org/wiki/Amino_acids There is a table here with all of the amino acids. The condensed structure is an abbreviated way of writing organic molecules in which C-H bonds are omitted. C-C bonds can also be omitted.

Q: Where can I find a document: "process for production" of essential and nutritive amino acids like lysine, etc.
If you can help me find an article, journal, book or anything about the process for the production of essential and nutritive amino acids like: phenylalanine, leucine, methionine, lysine and the like. Hope you guys can give me a direct link or information to it...Thanks so much. I badly need this for my project.

A: Lysine is formed by microorganisms acting on carbohydrates. There are quite a few such microorganisms. Each of these organisms requires special conditions and/or special additives to produce the product in good yield.

Q: Codon on mRNA and corresponding amino acid:?
UUA leucine UAA nonsense GCA alanine AAU sparagine AAG lysine UGC cysteine GUU valine UCG, UCU serine If the sequence of amino acids coded for by a strand of DNA is serine-alanine-lysine-leucine, the coding for the antisense strand of DNA is 1) 5' ACAGTTTCAAT 2) 5' TCTGCAAAGTTA 3) 3' UGUGCAAAGUUA 4) 3' UCUCGAAAGUUA 5) 3' TCACGUUUCAAU

A: None of these.

Q: What is the sequence of amino acids coded for by the following sequence of bases in a strand of DNA?
Table 8.2 Codon on mRNA and corresponding amino acid UUAleucineUAAstop GCAalanineAAUsparagine AAGlysineUGCcysteine GUUvalineUCG, UCUserine (Use Table 8.2.) What is the sequence of amino acids coded for by the following sequence of bases in a strand of DNA? 3' ATTACGCTTTGC A. Leucine-arginine-lysine-alanine B. Asparagine-arginine-lysine-alanine C. Asparagine-cysteine-valine-serine D. Transcription would stop at the first codon E. Can't tell

A: The strand of DNA is one of two things, either it is the antisense strand or it is the sense strand. 1. In the first case, if it is the antisense strand, then you would have to transcribe this into an mRNA: 3' ATTACGCTTTGC DNA antisense strand 5' UAAUGCGAAACG 3' mRNA So, the amino acid sequence would be: UAA UGC GAA ACG stop - Cys - *** - *** or U AAU GCG AAA CG - Asn - *** - *** - *** means the amino acid is not the table 8.2 given in the question (doesn't mean there isn't an amino acid for that codon). 2. If the strand is the sense strand, then it makes it easier to see the mRNA strand if you flip your DNA strand around and then substitute U for T to make it an mRNA strand: 3' ATTACGCTTTGC DNA 5' CGTTTCGCATTA 3' flip the DNA strand around so it reads 5' to 3' and assume this is the sense strand, so the mRNA strand is: 5' CGUUUCGCAUUA 3' mRNA The amino acid sequence is: CGU UUC GCA UUA *** - *** - Ala - Leu Since #2 doesn't seem to give any meaningful results, then #1 is probably the way to go. I would bet that your teacher wanted you to look at the DNA strand as the template and create an mRNA strand and then translate the strand. This gives a translation where the first codon is a stop codon. So, if you teacher is not a tricky person, the best answer is D, although it is incorrect because transcription would not stop at the first codon (translation would stop at the first codon). If your teacher is tricky, then E is the best answer because they tried to trip you up by using the word transcription in answer D instead of the proper term translation.

Q: which amino acid has maximum number of side chain conformations ?
options are tryptophan alanine proline leucine

A: leucine. proline and tryptophan are very rigid. alanine's side chain is basically non-existent.

Q: Paper Chromatography of Amino Acids..?
I did a Chem Lab, and I just know that there was something wrong with my chromatography solution. The amino acids we used were Tryptophan, Tyrosine, Lysine, Leucine, Aspartic Acid, Serine, Alanine, and Glycine. When the Chromatography was dried and done, the spots were basically all the same, aside from variations of color. So, my Rf values, are too close together (Rf = Disatnce compound travels/distance solution travels). Aren't the amino acids supposed to travel very differently from each other according to their size of structure and polarity? My data doesn't show that. I know I'm supposed to write that into my conclusion, but I don't know what to write if I can't contrast it to the the ideal outcome. Can anyone tell me how the Rf value is supposed to relate to the polarity and size of the amino acids? Very much appreciated! Thank you for your answer, I think you're right, I should have enough information to draw my own conclusion, even though the experiment was inconclusive. The chromatography solution was acetronitrile and ammonium acetate. The drops were rather large, but not overlapping. The difference of Rf values between each amino acid was no more than .2 cm. So, should I conclude that I don't know the relationship between Rf and the polarity or structure of each amino acid?

A: A couple thoughts...from what you've described, it sounds like you have enough knowledge to describe what should have happened. Yes, they should have exhibited differences as you've described. Now you only need explain why it didn't happen in your experiment (i.e. how to achieve resolution of the different amino acids). Were your spots large and overlapping? The concentration of the amino acids may have been too high; you could try using a more dilute solution or smaller droplet size. You may not have the best eluent; it may be necessary to change the polarity, use mixtures, or use a gradient system. The length of your TLC plate may have been too short. There are also lots of different TLC plates -- presumably you used silica gel. There are also various types of alumina (base-activated, neutral, acid-activated). If your Rf values were less than 0.2, you need to use media that is "less like" your amino acids or a solvent that is "more like" your amino acids. Good luck.

Q: What is the first amino acid encoded by this mRNA?
mRNA-GAGGACCUAGAUGCCUGUACCUGGCUAAUCUGUAGUAGUGG -Threonine -Methionine -Valine -Leucine -Tyrosine

A: Always MET...it is the start codon...so AUG (MET) GOOD LUCK.