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Topic: Imino acid

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Amino

Amino acid

Proline

	amino acid Information Center - amino acid
		Other amino acids contained in proteins amino acid weight loss amino acids and proteins are usually formed by post-translational amino acid arginine modification, 20 different amino acids that is modification free form amino acids after translation (protein synthesis).
		Many amino acids are used to synthesize other molecules, such as tryptophan which is a precursor of the neurotransmitter serotonin, and glycine which is one of the reactants in the synthesis amino acid scoring aas table of porphyrins such as heme.
		Amino acids are usually classified by properties of the side chain into four groups: acidic, what are amino acids basic, benefits of amino acids hydrophilic (polar), and hydrophobic (nonpolar).
	www.scipeeps.com /Sci-Chemistry_Topics_A_-_An/amino_acid.html (1847 words)

	Mycorrhiza Literature Exchange
		To study the response of non-mycorrhizal and mycorrhizal maize plants to drought, the changes in the pools of non-structural carbohydrates and amino acids were analysed in leaves and roots of two maize cvs.
		Acid invertase activity increased during drought in the leaves of both non-mycorrhizal and mycorrhizal plants whilst in the roots it was unaffected in non-mycorrhizal plants and decreased in the mycorrhizal ones.
		A drought-induced accumulation of amino acids as well as imino acids was found in roots and leaves of both mycorrhizal and non-mycorrhizal plants; leaves of mycorrhizal plants accumulated more imino acids than those of non-mycorrhizal ones.
	mycorrhiza.ag.utk.edu /H2O/vasche1.htm (306 words)

	Amino Acid - Atkinspedia
		Numerous non-standard amino acids are also biologically-important: Gamma-aminobutyric acid is another neurotransmitter, carnitine is used in lipid transport within a cell, ornithine, citrulline, homocysteine, hydroxyproline, hydroxylysine, and sarcosine.
		Some of the 20 standard amino acids are called essential amino acids because they cannot be synthesized by the body from other compounds through chemical reactions, but instead must be taken in with food.
		Nonstandard amino acids often occur in the metabolic pathways for standard amino acids - for example ornithine and citrulline occur in the urea cycle, part of amino acid breakdown.
	www.atkinsalltheway.com /wiki/index.php/Amino_Acid (1543 words)

	Amino acid - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-13)
		There are twenty "standard" amino acids used by cells in protein biosynthesis that are specified by the general genetic code.
		The phrase "branched-chain amino acids" is sometimes used to refer to the amino acids having aliphatic side-chains that are non-linear: leucine, isoleucine and valine.
		Some of the 20 standard proteinogenic amino acids are called essential amino acids because the human body cannot synthesize them from other compounds through chemical reactions, and they therefore must be obtained from food.
	www.knowledgehunter.info /wiki/Amino_acids (1662 words)

	Amino acid - Wikipedia, the free encyclopedia
		The general structure of an α-amino acid molecule, with the amine group on the left and the carboxyl group on the right.
		Amino acids are usually classified by the properties of the side chain into four groups.
		As amino acids have both the active groups of an amine and a carboxylic acid they can be considered both acid and base (though their natural pH is usually influenced by the R group).
	en.wikipedia.org /wiki/Amino_acid (1853 words)

	Botany online: Basic Metabolism - Biosyntheses - Amino Acids
		the family of aromatic amino acids (phosphoenolpyruvate and erythrose-4-phosphate, an intermediate in the pentose phosphate pathway).
		Both intermediates belong to the group of amino acids that is common in cells but is not used in the synthesis of proteins.
		The amino acids apartate, asparagine, threonine, isoleucine and methionine are counted among this group.
	www.biologie.uni-hamburg.de /b-online/e19/19e.htm (1330 words)

	Biology 403: Amino Acids and Peptides (Site not responding. Last check: 2007-10-13)
		The simplest R consists of a hydrogen atom: in that instance, the amino acid is glycine.
		It is not an amino acid at all: it is an imino acid, because the amine group is covalently bonded through three methylene groups to the alpha carbon.
		The amide nitrogens and carbonyl groups are fully engaged in peptide bonds in all the amino acids between the second and next-to-last amino acids in a protein and therefore cannot participate in reactions without rupturing the polypeptide chain.
	www.csrri.iit.edu /~howard/biol403/aminoacids.html (1857 words)

	Amino Acid Assay
		O ---> alpha-keto acid +NH alpha-keto acid + NH ---> aldehyde + CO Step (1) is an oxidative deamination reaction that removes two hydrogen from the alpha-amino acid to yield an alpha-imino acid.
		This alpha-keto acid further undergoes decarboxylation reaction of Step (3) under a heated condition to form an aldehyde that has one less carbon atom than the original amino acid.
		Although this is a fast and sensitive test for the presence of alpha-amino acids, because of the nonselectivity, it cannot be used to analyze the relative individual contents of a mixture of different amino acids.
	www.glue.umd.edu /~nsw/ench485/lab3a.htm (729 words)

	Degradation products of type I collagen
		4-hydroxyproline, an imino acid formed in a posttranslational enzyme reaction from proline, is a necessary requirement for the stability of the triple-helical conformation of the collagen molecule at body temperature.
		Acid hydrolysis followed by a chemical colour reaction to assess this imino acid can be used both for tissue samples and for urine.
		Most of the imino acid (up to 90%) is metabolized in the liver, but some is always passed into the urine.
	herkules.oulu.fi /isbn9514253116/html/x383.html (1408 words)

	Arginine Pyroglutamate
		Arginine pyroglutamate is the L-arginine salt of pyroglutamic acid.
		Pyroglutamate is formed in the body by the cyclization of the amino acid glutamic acid and is found naturally in plant and animal products, including the brain.
		Arginine pyroglutamate, which is comprised of the amino acid L-arginine and the imino acid pyroglutamate, is a water-soluble substance.
	www.pdrhealth.com /drug_info/nmdrugprofiles/nutsupdrugs/arg_0217.shtml (546 words)

	CHAPTER ONE
		The most recent thinking, in the absence of real knowledge, is that fat-ty acids are hydrolysed from the glycerol backbone at the muscle cell membrane, then taken into the muscle while the lipophoren and glycerol backbone are recirculated back to the fat body.
		Whereas the enzymes of the citric acid cycle are located in the matrix of the mitochondria, the ETC is buried within the inner mitochondrial membrane.
		One is the net yield of ATP per gram amino acid and the other is the solubility of the amino acids in aqueous hemo-lymph.
	entomology.unl.edu /ent801/metabolism.html (2469 words)

	Lecture 1: Protein Structure - Introduction
		Since proteins basically (topologically) are linear, head-to-tail arrays of amino acids, primary structure is completely determined by the knowledge of the structure of the 20 naturally occurring amino acids and of their sequence within the chain.
		Other special cases are the imino acid P which, as one might expect, has unique steric properties; being a frequent component of so-called reverse turns it is often found on the surface of proteins.
		By and large, the measurement of the free energy of transfer of an amino acid or its derivative or its partitioning between an aqueous and an organic phase yields the same results as a careful inventory of the distribution of residues in the inside and on the surface of proteins.
	www.sunysb.edu /biochem/courses/lectures/1bmo520.html (2212 words)

	British Journal of Pharmacology - Substrate specificity and functional characterisation of the H+//amino acid ...
		Heterocyclic amino and imino substrates for rPAT2 and mPAT1.
		Amino acids with charged side chains (the anionic glutamate and cationic lysine) are also excluded, but the main reason for this is likely to be the size of the side chain rather than the charge per se.
		The separation of charged groups in isonipecotic acid is analogous to the backbone length in GABA; so it is not surprising that isonipecotic acid is a substrate for PAT1 (although by the same rule it should not be, but clearly is, a low-affinity substrate for rPAT2; Figure 9a, e and h).
	www.nature.com /bjp/journal/v144/n1/full/0706029a.html (8513 words)

	Amino Acid Supplements I: Glutamine
		It is also described as glutamic acid, with glutamate being the free form (usually associated with one or more metals, such as sodium or potassium, to compensate the negative charge, making it a "salt") and glutamic acid being the term for the bound form, in complex proteins.
		Since glutamine is the main amino acid in the body and is produced by the body in response to deficiency, it is probably not possible to significantly lower the glutamine levels from the levels that already exist at the time of diagnosis.
		One serving is 32.5 grams of powder, derived from egg protein; proline is technically an imino* acid, similar to an amino acid.
	www.itmonline.org /arts/glutamine.htm (6054 words)

	E-communication with Noppol
		Cysteine is a polar amino acid and thus not suitable for alpha-helix structure of protein.
		Although glutamine is often referred to as an acidic amino acid, in fact, it is an uncharged polar amino acid with no ionizable group.
		In contrast to aliphatic amino acids that have no ionizable side chains, basic amino acids have ionizable amino groups that are positively charged at neutral pH.
	www.angelfire.com /falcon/chng2701/GWk5.html (772 words)

	BCH 4053 Biochemistry I (Site not responding. Last check: 2007-10-13)
		The amino acid R1, at the "amino terminus" of the polymer is the "first" amino acid.
		One of the 20 common amino acids is actually an imino acid.
		Free amino acids (excluding proline) share similar chemical reactivities due to the common amino and carboxyl groups.
	wine1.sb.fsu.edu /BCH4053/Lecture06/Lecture06.htm (597 words)

	PROTEINS AND ENZYMES
		Each amino acid has an amino group, a carboxylic acid group, a hydrogen atom and an R group all surrounding a central carbon atom - the alpha carbon.
		Amino acids are linked by peptide bonds formed between the carboxyl group of one amino acid and the amino group of the next.
		However, primary structure is nowadays considered to be the sequence of the amino acids.
	www.science.siu.edu /microbiology/micr425/425Notes/11-Proteins.html (4251 words)

	The Hindu : Sci Tech / Speaking Of Science : Proline — the maverick amino acid
		He was struck by the fact that in the long string of amino acids that make up the collagen molecule, proline occurs regularly, in every third position in the chain.
		The chemical structure of proline is depicted in the picture along with that of another (typical) amino acid, leucine, for comparison.
		The mystery of the maverick imino acid was cracked.
	www.hindu.com /seta/2006/09/21/stories/2006092100051500.htm (1034 words)

	Amino Acids
		I don't require memorization of the sterochemistry shown in the figure, but you should appreciate that the existence of a unique stereochemistry is vital to biochemistry, since otherwise a typical 100-residue protein would exist as a mixture of 2^100 diastereomers.
		One of three aromatic amino acids, therefore absorbs UV light, although not as weell as Tyr or Trp.
		Histidine is the only amino acid with a pKa in the physiological range, hence often seen in active sites when donation or abstraction of a proton is needed.
	www.biochem.umd.edu /biochem/kahn/teach_res/amino_acids (932 words)

	Proteins (Site not responding. Last check: 2007-10-13)
		Explain how the titration curve for a free amino acid with a charged side chain is different from that of a free amino acid with a neutral or hydrophobic side chain.
		Explain the role of amino acid sequence in the conformation of a protein.
		Name the amino acid that is susceptible to oxidation, especially by molecular oxygen.
	www.ttuhsc.edu /som/courses/biochem/proteins.htm (910 words)

	Amazon.ca: Amino Acid and Peptide Synthesis: Books: John Jones (Site not responding. Last check: 2007-10-13)
		For this reason a-amino acid and peptide chemistry is central to organic chemistry and their synthesis is a core topic of most courses.
		The study of amino acids and peptides continues to become increasingly important to chemists because of the growing overlap of mainstream organic chemistry with bioorganic chemistry and biochemistry.
		The text begins with a brief survey of the role and diversity of amino acids, peptides, and proteins in nature, and goes on to describe and explain the principal methods of chemical synthesis.
	www.amazon.ca /Amino-Acid-Peptide-Synthesis-Jones/dp/0199257388 (528 words)

	Identification of Mammalian Proline Transporter SIT1 (SLC6A20) with Characteristics of Classical System Imino -- ...
		of amino acids are known to underlie a number of inherited disorders.
		(betaine and taurine), imino acids, and amino acids.
		with a Na leak in the absence of imino/amino acid substrate
	www.jbc.org /cgi/content/full/280/10/8974 (5875 words)

	Table of Amino Acids and Abbreviations
		An amino acid is the monomer in proteins, the complex molecules (often containing thousands of atoms) that play key roles in most processes in life, including providing structure to cells, identifying cells by protruding from the cell membrane, catalyzing myriad reactions, regulating the cell cycle, and more.
		Amino acids have full names, but for simplicity are assigned both three letter and one letter abbreviations.
		Properly speaking, there are far more amino acids than are listed here (these are coded for directly in DNA; others are not), and one of the "amino" acids (proline) is chemically an "imino" acid, but that is outside the scope of this brief overview.
	www.nitrogenorder.org /lessons/aminotable.shtml (303 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		One of a group of organic heterocyclic compounds containing a five-membered diunsaturated ring with two nonadjacent nitrogen atoms as part of the ring; the particular compound imidazole is a member of the group.
		A compound derived from acid anhydrides by replacing the oxygen (O) with the
		A crystalline substance used as an intermediate in the manufacture of chelating agents, surface-active agents, and complex salts.
	www.accessscience.com /Dictionary/I/I4/DictI4.html (1430 words)

	Lecture II From Building Block to Primary Structure - Peptide Analysis and Synthesis.
		The amides, Q and N, are hydrolyzed to the free acids in HCl, so that D and E values in a composition reflect the sum of the amides and free acids in the intact protein (sometomes referred to as Z and B).
		Amino acid derivatives are sorted on silica beads that are derivatized with aliphatic or aromatic hydrocarbons.
		There are two classes of reagents for proteolysis: (i) chemical compounds that react covalently with particular amino acid side chains and their adjacent peptide bonds, promoting peptide bond hydrolysis; and (ii) enzymes, known collectively as endoproteinases, that catalyze the hydrolysis of peptide bonds adjacent to specific amino acid residues.
	www.sunysb.edu /biochem/courses/lectures/2bmo520.html (2874 words)

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