Get it on Google Play
New! Download Unionpedia on your Android™ device!
Faster access than browser!


Index Histidine

Histidine (symbol His or H) is an α-amino acid that is used in the biosynthesis of proteins. [1]

79 relations: Acid dissociation constant, Actinobacteria, Adenosine triphosphate, Albrecht Kossel, Amine, Amino acid, Ammonia, Ammonium, Antioxidant, Aromaticity, ATP phosphoribosyltransferase, Biomarker (medicine), Biosynthesis, Carbon monoxide, Carbonic anhydrase, Carboxylate, Carboxylic acid, Carnosine, Carnosinemia, Catalysis, Catalytic triad, Chemical shift, Cysteine, De novo synthesis, Diphthamide, Double bond, Electron transport chain, Enzyme, Ergothioneine, Essential amino acid, Formiminoglutamic acid, Genetic code, Heme, Hemoglobin, Henderson–Hasselbalch equation, Histamine, Histidine ammonia-lyase, Histidinemia, Histidinol dehydrogenase, Imidazole, Ion, Iron, Β-Alanine, Ligand, Lone pair, Metalloprotein, Methyltransferase, Mitochondrion, National Academy of Medicine, Neurospora crassa, ..., Nitric acid, Nitrogen, Nuclear magnetic resonance, Nucleophile, Paramagnetism, Pauly reaction, Pentose phosphate pathway, PH, Phosphoribosyl pyrophosphate, Physiological condition, Pi bond, Prokaryote, Protein, Protonation, Radical (chemistry), Resonance (chemistry), Ribose 5-phosphate, Ribose-phosphate diphosphokinase, Serine, Side chain, Stacking (chemistry), Succinate dehydrogenase, Tautomer, Tetrahydrofolic acid, Threonine, Urocanic acid, Urocanic aciduria, Zinc, 3-Methylhistidine. Expand index (29 more) »

Acid dissociation constant

An acid dissociation constant, Ka, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution.

New!!: Histidine and Acid dissociation constant · See more »


The Actinobacteria are a phylum of Gram-positive bacteria.

New!!: Histidine and Actinobacteria · See more »

Adenosine triphosphate

Adenosine triphosphate (ATP) is a complex organic chemical that participates in many processes.

New!!: Histidine and Adenosine triphosphate · See more »

Albrecht Kossel

Ludwig Karl Martin Leonhard Albrecht Kossel (16 September 1853 – 5 July 1927) was a German biochemist and pioneer in the study of genetics.

New!!: Histidine and Albrecht Kossel · See more »


In organic chemistry, amines are compounds and functional groups that contain a basic nitrogen atom with a lone pair.

New!!: Histidine and Amine · See more »

Amino acid

Amino acids are organic compounds containing amine (-NH2) and carboxyl (-COOH) functional groups, along with a side chain (R group) specific to each amino acid.

New!!: Histidine and Amino acid · See more »


Ammonia is a compound of nitrogen and hydrogen with the formula NH3.

New!!: Histidine and Ammonia · See more »


The ammonium cation is a positively charged polyatomic ion with the chemical formula.

New!!: Histidine and Ammonium · See more »


Antioxidants are molecules that inhibit the oxidation of other molecules.

New!!: Histidine and Antioxidant · See more »


In organic chemistry, the term aromaticity is used to describe a cyclic (ring-shaped), planar (flat) molecule with a ring of resonance bonds that exhibits more stability than other geometric or connective arrangements with the same set of atoms.

New!!: Histidine and Aromaticity · See more »

ATP phosphoribosyltransferase

In enzymology, an ATP phosphoribosyltransferase is an enzyme that catalyzes the chemical reaction Thus, the two substrates of this enzyme are 1-(5-phospho-D-ribosyl)-ATP and diphosphate, whereas its two products are ATP and 5-phospho-alpha-D-ribose 1-diphosphate.

New!!: Histidine and ATP phosphoribosyltransferase · See more »

Biomarker (medicine)

In medicine, a biomarker is a measurable indicator of the severity or presence of some disease state.

New!!: Histidine and Biomarker (medicine) · See more »


Biosynthesis (also called anabolism) is a multi-step, enzyme-catalyzed process where substrates are converted into more complex products in living organisms.

New!!: Histidine and Biosynthesis · See more »

Carbon monoxide

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is slightly less dense than air.

New!!: Histidine and Carbon monoxide · See more »

Carbonic anhydrase

The carbonic anhydrases (or carbonate dehydratases) form a family of enzymes that catalyze the interconversion between carbon dioxide and water and the dissociated ions of carbonic acid (i.e. bicarbonate and protons).

New!!: Histidine and Carbonic anhydrase · See more »


A carboxylate is a salt or ester of a carboxylic acid.

New!!: Histidine and Carboxylate · See more »

Carboxylic acid

A carboxylic acid is an organic compound that contains a carboxyl group (C(.

New!!: Histidine and Carboxylic acid · See more »


Carnosine (beta-alanyl-L-histidine), featuring the characteristic Imidazole-ring, is a dipeptide molecule, made up of the amino acids beta-alanine and histidine.

New!!: Histidine and Carnosine · See more »


Carnosinemia, also called carnosinase deficiency or aminoacyl-histidine dipeptidase deficiency, is a rare autosomal recessive metabolic disorder caused by a deficiency of carnosinase', a dipeptidase (a type of enzyme that splits dipeptides into their two amino acid constituents).

New!!: Histidine and Carnosinemia · See more »


Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalysthttp://goldbook.iupac.org/C00876.html, which is not consumed in the catalyzed reaction and can continue to act repeatedly.

New!!: Histidine and Catalysis · See more »

Catalytic triad

A catalytic triad is a set of three coordinated amino acids that can be found in the active site of some enzymes.

New!!: Histidine and Catalytic triad · See more »

Chemical shift

In nuclear magnetic resonance (NMR) spectroscopy, the chemical shift is the resonant frequency of a nucleus relative to a standard in a magnetic field.

New!!: Histidine and Chemical shift · See more »


Cysteine (symbol Cys or C) is a semi-essential proteinogenic amino acid with the formula HO2CCH(NH2)CH2SH.

New!!: Histidine and Cysteine · See more »

De novo synthesis

De novo synthesis refers to the synthesis of complex molecules from simple molecules such as sugars or amino acids, as opposed to recycling after partial degradation.

New!!: Histidine and De novo synthesis · See more »


Diphthamide is a post-translationally modified histidine amino acid found in archaeal and eukaryotic elongation factor 2 (eEF-2).

New!!: Histidine and Diphthamide · See more »

Double bond

A double bond in chemistry is a chemical bond between two chemical elements involving four bonding electrons instead of the usual two.

New!!: Histidine and Double bond · See more »

Electron transport chain

An electron transport chain (ETC) is a series of complexes that transfer electrons from electron donors to electron acceptors via redox (both reduction and oxidation occurring simultaneously) reactions, and couples this electron transfer with the transfer of protons (H+ ions) across a membrane.

New!!: Histidine and Electron transport chain · See more »


Enzymes are macromolecular biological catalysts.

New!!: Histidine and Enzyme · See more »


Ergothioneine is a naturally occurring amino acid and is a thiourea derivative of histidine, containing a sulfur atom on the imidazole ring.

New!!: Histidine and Ergothioneine · See more »

Essential amino acid

An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized ''de novo'' (from scratch) by the organism, and thus must be supplied in its diet.

New!!: Histidine and Essential amino acid · See more »

Formiminoglutamic acid

Formiminoglutamic acid (FIGLU) is an intermediate in the metabolism of histidine.

New!!: Histidine and Formiminoglutamic acid · See more »

Genetic code

The genetic code is the set of rules used by living cells to translate information encoded within genetic material (DNA or mRNA sequences) into proteins.

New!!: Histidine and Genetic code · See more »


Heme or haem is a coordination complex "consisting of an iron ion coordinated to a porphyrin acting as a tetradentate ligand, and to one or two axial ligands." The definition is loose, and many depictions omit the axial ligands.

New!!: Histidine and Heme · See more »


Hemoglobin (American) or haemoglobin (British); abbreviated Hb or Hgb, is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates (with the exception of the fish family Channichthyidae) as well as the tissues of some invertebrates.

New!!: Histidine and Hemoglobin · See more »

Henderson–Hasselbalch equation

In chemistry, the Henderson–Hasselbalch equation describes the derivation of pH as a measure of acidity (using, the negative log of the acid dissociation constant) in biological and chemical systems.

New!!: Histidine and Henderson–Hasselbalch equation · See more »


Histamine is an organic nitrogenous compound involved in local immune responses, as well as regulating physiological function in the gut and acting as a neurotransmitter for the brain, spinal cord, and uterus.

New!!: Histidine and Histamine · See more »

Histidine ammonia-lyase

Histidine ammonia-lyase (or histidase, or histidinase) is an enzyme that in humans is encoded by the HAL gene.

New!!: Histidine and Histidine ammonia-lyase · See more »


Histidinemia, also referred to as histidinuria, is a rare autosomal recessive metabolic disorder caused by a deficiency of the enzyme histidase.

New!!: Histidine and Histidinemia · See more »

Histidinol dehydrogenase

In enzymology, a histidinol dehydrogenase (HIS4) (HDH) is an enzyme that catalyzes the chemical reaction Thus, the two substrates of this enzyme are L-histidinol and NAD+, whereas its 3 products are L-histidine, NADH, and H+.

New!!: Histidine and Histidinol dehydrogenase · See more »


Imidazole is an organic compound with the formula C3N2H4.

New!!: Histidine and Imidazole · See more »


An ion is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).

New!!: Histidine and Ion · See more »


Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.

New!!: Histidine and Iron · See more »


β-Alanine (or beta-alanine) is a naturally occurring beta amino acid, which is an amino acid in which the amino group is at the β-position from the carboxylate group (i.e., two atoms away, see Figure 1).

New!!: Histidine and Β-Alanine · See more »


In coordination chemistry, a ligand is an ion or molecule (functional group) that binds to a central metal atom to form a coordination complex.

New!!: Histidine and Ligand · See more »

Lone pair

In chemistry, a lone pair refers to a pair of valence electrons that are not shared with another atomIUPAC Gold Book definition: and is sometimes called a non-bonding pair.

New!!: Histidine and Lone pair · See more »


Metalloprotein is a generic term for a protein that contains a metal ion cofactor.

New!!: Histidine and Metalloprotein · See more »


Methyltransferases are a large group of enzymes that all methylate their substrates but can be split into several subclasses based on their structural features.

New!!: Histidine and Methyltransferase · See more »


The mitochondrion (plural mitochondria) is a double-membrane-bound organelle found in most eukaryotic organisms.

New!!: Histidine and Mitochondrion · See more »

National Academy of Medicine

The National Academy of Medicine (NAM), formerly called the Institute of Medicine (IoM), is an American nonprofit, non-governmental organization.

New!!: Histidine and National Academy of Medicine · See more »

Neurospora crassa

Neurospora crassa is a type of red bread mold of the phylum Ascomycota.

New!!: Histidine and Neurospora crassa · See more »

Nitric acid

Nitric acid (HNO3), also known as aqua fortis (Latin for "strong water") and spirit of niter, is a highly corrosive mineral acid.

New!!: Histidine and Nitric acid · See more »


Nitrogen is a chemical element with symbol N and atomic number 7.

New!!: Histidine and Nitrogen · See more »

Nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a magnetic field absorb and re-emit electromagnetic radiation.

New!!: Histidine and Nuclear magnetic resonance · See more »


Nucleophile is a chemical species that donates an electron pair to an electrophile to form a chemical bond in relation to a reaction.

New!!: Histidine and Nucleophile · See more »


Paramagnetism is a form of magnetism whereby certain materials are weakly attracted by an externally applied magnetic field, and form internal, induced magnetic fields in the direction of the applied magnetic field.

New!!: Histidine and Paramagnetism · See more »

Pauly reaction

The Pauly reaction is a chemical test used for detecting the presence of tyrosine or histidine in proteins.

New!!: Histidine and Pauly reaction · See more »

Pentose phosphate pathway

The pentose phosphate pathway (also called the phosphogluconate pathway and the hexose monophosphate shunt) is a metabolic pathway parallel to glycolysis.

New!!: Histidine and Pentose phosphate pathway · See more »


In chemistry, pH is a logarithmic scale used to specify the acidity or basicity of an aqueous solution.

New!!: Histidine and PH · See more »

Phosphoribosyl pyrophosphate

Phosphoribosyl pyrophosphate (PRPP) is a pentosephosphate.

New!!: Histidine and Phosphoribosyl pyrophosphate · See more »

Physiological condition

Physiological condition or, more often "physiological conditions" is a term used in biology, biochemistry, and medicine.

New!!: Histidine and Physiological condition · See more »

Pi bond

In chemistry, pi bonds (π bonds) are covalent chemical bonds where two lobes of an orbital on one atom overlap two lobes of an orbital on another atom.

New!!: Histidine and Pi bond · See more »


A prokaryote is a unicellular organism that lacks a membrane-bound nucleus, mitochondria, or any other membrane-bound organelle.

New!!: Histidine and Prokaryote · See more »


Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues.

New!!: Histidine and Protein · See more »


In chemistry, protonation is the addition of a proton (H+) to an atom, molecule, or ion, forming the conjugate acid.

New!!: Histidine and Protonation · See more »

Radical (chemistry)

In chemistry, a radical (more precisely, a free radical) is an atom, molecule, or ion that has an unpaired valence electron.

New!!: Histidine and Radical (chemistry) · See more »

Resonance (chemistry)

In chemistry, resonance or mesomerism is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis structure.

New!!: Histidine and Resonance (chemistry) · See more »

Ribose 5-phosphate

Ribose 5-phosphate (R5P) is both a product and an intermediate of the pentose phosphate pathway.

New!!: Histidine and Ribose 5-phosphate · See more »

Ribose-phosphate diphosphokinase

Ribose-phosphate diphosphokinase (or phosphoribosyl pyrophosphate synthetase or ribose-phosphate pyrophosphokinase) is an enzyme that converts ribose 5-phosphate into phosphoribosyl pyrophosphate (PRPP).

New!!: Histidine and Ribose-phosphate diphosphokinase · See more »


Serine (symbol Ser or S) is an ɑ-amino acid that is used in the biosynthesis of proteins.

New!!: Histidine and Serine · See more »

Side chain

In organic chemistry and biochemistry, a side chain is a chemical group that is attached to a core part of the molecule called "main chain" or backbone.

New!!: Histidine and Side chain · See more »

Stacking (chemistry)

In chemistry, pi stacking (also called π–π stacking) refers to attractive, noncovalent interactions between aromatic rings, since they contain pi bonds.

New!!: Histidine and Stacking (chemistry) · See more »

Succinate dehydrogenase

Succinate dehydrogenase (SDH) or succinate-coenzyme Q reductase (SQR) or respiratory Complex II is an enzyme complex, found in many bacterial cells and in the inner mitochondrial membrane of eukaryotes.

New!!: Histidine and Succinate dehydrogenase · See more »


Tautomers are constitutional isomers of organic compounds that readily interconvert.

New!!: Histidine and Tautomer · See more »

Tetrahydrofolic acid

Tetrahydrofolic acid, or tetrahydrofolate, is a folic acid derivative.

New!!: Histidine and Tetrahydrofolic acid · See more »


Threonine (symbol Thr or T) is an amino acid that is used in the biosynthesis of proteins.

New!!: Histidine and Threonine · See more »

Urocanic acid

Urocanic acid is an intermediate in the catabolism of L-histidine.

New!!: Histidine and Urocanic acid · See more »

Urocanic aciduria

Urocanic aciduria, also called urocanate hydratase deficiency or urocanase deficiency, is an autosomal recessive metabolic disorder caused by a deficiency of the enzyme urocanase.

New!!: Histidine and Urocanic aciduria · See more »


Zinc is a chemical element with symbol Zn and atomic number 30.

New!!: Histidine and Zinc · See more »


3-Methylhistidine (3-MH) is a post-translationally modified amino acid which is excreted in human urine.

New!!: Histidine and 3-Methylhistidine · See more »

Redirects here:

Histadine, Histidin, Histidine metabolism, Histidines, L-Histidine, L-histidine.


[1] https://en.wikipedia.org/wiki/Histidine

Hey! We are on Facebook now! »