In enzymology, a diphthine—ammonia ligase (EC 6.3.1.14, diphthamide synthase, diphthamide synthetase) is an enzyme that catalyzes the chemical reaction
ATP + diphthine + NH3 ADP + phosphate + diphthamide
The 3 substrates of this enzyme are ATP, diphthine, and NH3, whereas its 3 products are ADP, phosphate, and diphthamide.
This enzyme belongs to the family of ligases, specifically those forming carbon-nitrogen bonds as acid-D-amino-acid ligases (peptide synthases). The systematic name of this enzyme class is diphthine:ammonia ligase (ADP-forming). Other names in common use include diphthamide synthase, and diphthamide synthetase.
References[edit]
Moehring JM, Moehring TJ (1988). "The post-translational trimethylation of diphthamide studied in vitro". J. Biol. Chem. 263 (8): 3840–4. PMID 3346227.
Moehring TJ, Moehring JM (1987). "Mutant cultured cells used to study the synthesis of diphthamide". UCLA Symp. Mol. Cell. Biol. New Series. 45: 53–63.
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Enzymes: CO CS and CN ligases (EC 6.1-6.3)
6.1: Carbon-Oxygen
Aminoacyl tRNA synthetase
Alanine
Arginine
Asparagine
Aspartate
Cysteine
D-alanine—poly(phosphoribitol) ligase
Glutamate
Glutamine
Glycine
Histidine
Isoleucine
Leucine
Lysine
Methionine
Phenylalanine
Proline
Serine
Threonine
Tryptophan
Tyrosine
Valine
6.2: Carbon-Sulfur
Succinyl coenzyme A synthetase
Acetyl—CoA synthetase
Long-chain-fatty-acid—CoA ligase
6.3: Carbon-Nitrogen
Glutamine synthetase
Ubiquitin ligase
Cullin
Von Hippel–Lindau tumor suppressor
UBE3A
Mdm2
Anaphase-promoting complex
UBR1
Glutathione synthetase
CTP synthetase
Adenylosuccinate synthase
Argininosuccinate synthase
Holocarboxylase synthetase
GMP synthase
Asparagine synthetase
Carbamoyl phosphate synthetase
I
II
Glutamate–cysteine ligase
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Enzymes
Activity
Active site
Binding site
Catalytic triad
Oxyanion hole
Enzyme promiscuity
Diffusion-limited enzyme
Cofactor
Enzyme catalysis
Regulation
Allosteric regulation
Cooperativity
Enzyme inhibitor
Enzyme activator
Classification
EC number
Enzyme superfamily
Enzyme family
List of enzymes
Kinetics
Enzyme kinetics
Eadie–Hofstee diagram
Hanes–Woolf plot
Lineweaver–Burk plot
Michaelis–Menten kinetics
Types
EC1 Oxidoreductases (list)
EC2 Transferases (list)
EC3 Hydrolases (list)
EC4 Lyases (list)
EC5 Isomerases (list)
EC6 Ligases (list)
EC7 Translocases (list)
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