| guanosine tetraphosphate | <chemical> Guanosine 5'-diphosphate 2'(3')-diphosphate. A guanine nucleotide containing four phosphate groups. Two phosphate groups are esterified to the sugar moiety in the 5' position and the other two in the 2' or 3' position. This nucleotide serves as a messenger to turn off the synthesis of ribosomal RNA when amino acids are not available for protein synthesis. Synonym: magic spot I. Chemical name: Guanosine 5'-(trihydrogen diphosphate), mono(trihydrogen diphosphate) (ester) (12 Dec 1998) |
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| guanosine triphosphate | A molecule which consists of the nitrogenous base guanine linked to the sugar ribose and which has three phosphate groups attached to the 5th carbom atom of the ribose. GTP is a high-energy compound which serves as an energy source for many biochemical reactions. It is required for the formation of peptide bonds between amino acids during translation and is required for ribonucleic acid synthesis since it is a direct precursor. (09 Oct 1997) |
| guanosine triphosphate binding protein | <protein> A type of protein embedded in the cytoplasmic membrane of the cell which transmits signals from outside the cell (such as from hormones binding to receptors on the outside of the cell) to the inside of the cell, where it causes some sort of biochemical reaction within the cell to the signal (such as the altering of metabolic pathways or gene expression). The process by which the protein does this is unclear but involves exchanging a molecule of GDP for a molecule of GTP. (09 Oct 1997) |
| guanosine-3',5'-bis(diphosphate) 3'-pyrophosphatase | <enzyme> Catalyses breakdown of guanosine tetraphosphate into guanosine diphosphate and pyrophosphate; spot protein is isolated from e. Coli Registry number: EC 3.1.7.2 Synonym: ppgpp-3'-pyrophosphohydrolase, guanosine tetraphosphate-3'-pyrophosphohydrolase, spot protein, spot gene product, ppgpp pyrophosphorylase, ppgppase, guanosine-5'-diphosphate 3'-diphosphate pyrophosphorylase (26 Jun 1999) |
| guanosine-5'-triphosphate, 3'-diphosphate pyrophosphatase | <enzyme> Catalyses the hydrolysis of guanosine 5'-triphosphate, 3'-diphosphate to yield guanosine 5'-diphosphate, 3'-diphosphate and orthophosphate; from E coli; also hydrolyzes other guanosine 5'-triphosphate derivatives with at least one unsubstituted phosphate group on the 3'-position, but not GTP, ATP or adenosine 5'-triphosphate, 3'-diphosphate Registry number: EC 3.6.1.40 Synonym: guanosine pentaphosphate phosphohydrolase, GTPdp pyrophosphatase, pppgpp 5'-phosphohydrolase, guanosine 5'-triphosphate-3'diphosphate 5'-phosphohydrolase, pppgpp-5'-phosphohydrolase, pppgpp-5'-phosphatase (26 Jun 1999) |
| guanoxan sulfate | (1,4-Benzodioxan-2-ylmethyl)guanidine sulfate;an antihypertensive agent. (05 Mar 2000) |
| guanyl | The radical of guanine. (05 Mar 2000) |
| guanyl cyclase | <enzyme> That is responsible for catalysing the synthesis of guanosine 3', 5' cyclic monophosphate from guanosine 5' triphosphate (cyclic GMP cGMP) is used as a second messenger in heart muscle and photoreceptor cells). Plasma membrane form of guanylate cyclase is Integral membrane proteins with an extracellular receptor for peptide hormones, a transmembrane domain, a protein kinase like domain and a guanylate cyclase domain. Examples: sea urchin receptors for speract and resact and atrial natriuretic peptide receptors. Two soluble forms of guanylate cyclase are also known they are heterodimers of highly related subunits, 70-80 kD. (18 Nov 1997) |
| guanylate cyclase | <enzyme> That is responsible for catalysing the synthesis of guanosine 3', 5' cyclic monophosphate from guanosine 5' triphosphate (cyclic GMP cGMP) is used as a second messenger in heart muscle and photoreceptor cells). Plasma membrane form of guanylate cyclase is Integral membrane proteins with an extracellular receptor for peptide hormones, a transmembrane domain, a protein kinase like domain and a guanylate cyclase domain. Examples: sea urchin receptors for speract and resact and atrial natriuretic peptide receptors. Two soluble forms of guanylate cyclase are also known they are heterodimers of highly related subunits, 70-80 kD. (18 Nov 1997) |
| guanylate kinase | <enzyme> Erythrocyte protein p55 is a sequenced membrane-bound guanylate kinase Registry number: EC 2.7.4.8 Synonym: GMP kinase, guanylate kinase 1, erythrocyte protein p55, chapsyn-110, magi-1 protein, maguk enzyme, membrane-associated guanylate kinase (26 Jun 1999) |
| guanylic acid | A major component of ribonucleic acids. Synonym: guanine ribonucleotide, guanosine 5'-monophosphate. Guanylic acid reductase (GMP reductase), an enzyme that catalyses the reaction of GMP with NADPH producing IMP, NH3, and NADP+; a part of the purine salvage pathway. Guanylic acid synthetase (GMP synthetase), an enzyme catalyzing the reaction of l-glutamine, XMP, and ATP to produce GMP, l-glutamate, AMP, and pyrophosphate; a key step in purine biosynthesis. Acronym: GMP (05 Mar 2000) |
| guanylin | <physiology> Peptide occuring in vertebrate gut that elevates the second messenger cyclic GMP in a variety of tissues (including gut) via a membrane guanylate cyclase. The receptor is also the target for the E. Coli heat stable enterotoxin. (18 Nov 1997) |
| guanyloribonuclease | rNase T1. See entries under ribonuclease |
| guanylthiourea | <chemical> 1-amidino-2-thiourea. May protect against hypoxic damage; proposed for treatment of shock due to trauma or blood loss; also stimulates paretic gastrointestinal system. Synonym: guthimine; guthymine. Chemical name: Thiourea, (aminoiminomethyl)- (12 Dec 1998) |
| guanylyl | The radical of guanylic acid. (05 Mar 2000) |
Synonyms : GTPgammaS, Guanosine 5'-(3-O-Thio)Triphosphate, gamma S, GTP, gamma Thio GTP
Synonyms : Guanosine 5'-Diphosphate, Guanosine 5'-Trihydrogen Diphosphate, 5'-Diphosphate, Guanosine, 5'-Trihydrogen Diphosphate, Guanosine, Diphosphate, Guanosine, Diphosphate, Guanosine 5'-Trihydrogen, Guanosine 5' Diphosphate, Guanosine 5' Trihydrogen Diphosphate
Synonyms : Diphosphate Fucose, Guanosine, Diphosphofucose, Guanosine, Fucose, GDP, Fucose, Guanosine Diphosphate
Synonyms : Diphosphate Mannose, Guanosine, Diphosphomannose, Guanosine, Mannose, GDP, Mannose, Guanosine Diphosphate, Mannose, Guanosine Pyrophosphate, Pyrophosphate Mannose, Guanosine
Synonyms : Diphosphate Sugars, Guanosine, Sugars, GDP, Sugars, Guanosine Diphosphate
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| guinea worm |
Guinea worm disease: a painful and debilitating infestation contracted by drinking stagnant water contaminated with Guinea worm larvae that can mature inside a human's abdomen until the worm emerges through a painful blister in the person's skin parasitic roundworm of India and Africa that lives in the abdomen or beneath the skin of humans and other vertebrates
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| gullet |
esophagus: the passage between the pharynx and the stomach
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| gum |
chewing gum: a preparation (usually made of sweetened chicle) for chewing gingiva: the tissue (covered by mucous membrane) of the jaws that surrounds the bases of the teeth any of various substances (soluble in water) that exude from certain plants; they are gelatinous when moist but harden on drying cover, fill, fix or smear with or as if with gum; "if you gum the tape it is stronger" glue: cement consisting of a sticky substance that is used as an adhesive mumble: grind with the gums; chew without teeth and with great difficulty; "the old man had no teeth left and mumbled his food" gumwood: wood or lumber from any of various gum trees especially the sweet gum become sticky gum tree: any of various trees of the genera Eucalyptus or Liquidambar or Nyssa that are sources of gum exude or form gum; "these trees gum in the Spring"
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| gumboil |
a boil or abscess on the gums
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| gumma |
a small rubbery granuloma that is characteristic of an advanced stage of syphilis
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| GU | one who provides a warrant or guarantee to another |
|---|---|
| GU | a collateral agreement to answer for the debt of another in case that person defaults |
| GU | a position on a basketball team |
| GU | a position on the line of scrimmage |
| GU | the duty of serving as a sentry |
| GU | a device designed to prevent injury |
| GU | a posture of defence in boxing or fencing |
| GU | a group of men who escort and protect some important person |
| GU | the person who plays that position on a football team |
| GU | a person who keeps watch over something or someone |
| GU | the person who plays the position of guard on a basketball team |
| GU | watch over or shield from danger or harm |
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