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Irreversible reaction step at the branch points of biochemical pathways
In biochemistry, the committed step (also known as the first committed step) is an effectively irreversible, enzyme-catalyzed reaction that occurs at a
Committed_step
Class of enzymes
The reaction catalyzed by DGAT is considered the terminal and only committed step in the acyl-CoA-dependent triglyceride synthesis, universally important
Diglyceride_acyltransferase
Chemical compound
biosynthesis of carotenoids. The synthesis of phytoene is the first committed step in the synthesis of carotenoids in plants. Phytoene is produced from
Phytoene
Class of enzymes
1-carboxyvinyltransferase (EC 2.5.1.7) is an enzyme that catalyzes the first committed step in peptidoglycan biosynthesis of bacteria: phosphoenolpyruvate +
UDP-N-acetylglucosamine 1-carboxyvinyltransferase
UDP-N-acetylglucosamine_1-carboxyvinyltransferase
Class of enzymes
by many activators and inhibitors. PFK-1 catalyzes the important "committed" step of glycolysis, the conversion of fructose 6-phosphate and ATP to fructose
Phosphofructokinase_1
Slowest step in a series of biochemical reactions
Branched pathways Metabolic control analysis Biochemical systems theory Committed step Nelson, David L.; Cox, Michael M. (2005). Lehninger Principles of Biochemistry
Rate-limiting step (biochemistry)
Rate-limiting_step_(biochemistry)
The following is an episode list for the American television sitcom Step by Step. The series originally ran for six seasons on ABC from September 20, 1991
List_of_Step_by_Step_episodes
Class of enzymes
second ATP to give carbamoyl phosphate plus ADP. It represents the first committed step in pyrimidine and arginine biosynthesis in prokaryotes and eukaryotes
Carbamoyl phosphate synthetase
Carbamoyl_phosphate_synthetase
Family where one parent has children that are not genetically related to the other parent
child from another relationship. The earliest recorded use of the prefix step-, in the form steop-, is from an 8th-century glossary of Latin-Old English
Stepfamily
Series of interconnected biochemical reactions
carboxylated by acetyl-CoA carboxylase into malonyl CoA, the first committed step in the synthesis of fatty acids, or it can be combined with acetoacetyl-CoA
Glycolysis
Chemical compound
olpyruvyltransferase, also known as MurA. This enzyme catalyzes the committed step in peptidoglycan biosynthesis, namely the ligation of phosphoenolpyruvate
Fosfomycin
Coenzyme, notable for its synthesis and oxidation role
by the enzyme pantothenate kinase (PanK; CoaA; CoaX). This is the committed step in CoA biosynthesis and requires ATP. A cysteine is added to 4′-phosphopantothenate
Coenzyme_A
Species of evergreen shrub
Dephosphorylation of xanthosine-5'-monophosphate into xanthosine is the committed step for the xanthosines entering the beginning of the most common pathway
Camellia_sinensis
2014 American film
Step Up: All In is a 2014 American dance film directed by Trish Sie and written by John Swetnam. The film is the sequel to Step Up Revolution (2012) and
Step_Up:_All_In
Chemical reactions and pathways involving lysis of purine nucleotides
not the committed step to purine synthesis because PRPP is also used in pyrimidine synthesis and salvage pathways. The first committed step is the reaction
Purine_metabolism
of other substituted cinnamoyl-CoA's as well. Catalyzing the first committed step in monolignol biosynthesis, this enzyme plays a critical role in lignin
Cinnamoyl-CoA_reductase
Enzyme
which is also the committed step in the formation of creatine. L-arginine + glycine ornithine + glycocyamine The second step of the process
Arginine:glycine amidinotransferase
Arginine:glycine_amidinotransferase
Chemical compound
also uses two molecules of ATP in its initial stages as a committed and irreversible step. For this reason glycolysis is not reversible and has a net
1,3-Bisphosphoglyceric_acid
Carotenoid pigment
tail-to-tail configuration to give the 40-carbon phytoene, the first committed step in carotenoid biosynthesis. Through several desaturation steps, phytoene
Lycopene
gallica cDNA encoding protoilludene synthase, which catalyzes the first committed step in the synthesis of antimicrobial melleolides". J. Biol. Chem. 286 (9):
Delta6-protoilludene_synthase
4-dideoxy-d-arabino-heptulosonic acid 7-phosphate has been proposed to be the first committed step in the aminoshikimate pathway. Guo and Frost demonstrated that the unusual
Aminoshikimate_pathway
Chemical compound
synthase to form δ-aminolevulinic acid (dALA). This process is the committed step in the biosynthesis of porphobilinogen and thus hemoglobin. Succinyl
Succinyl-CoA
"Cyclization of geranylgeranyl diphosphate to taxa-4(5),11(12)-diene is the committed step of taxol biosynthesis in Pacific yew". J. Biol. Chem. 270 (15): 8686–90
Taxadiene_synthase
Class of enzymes
both the urea cycle and polyamine synthesis, and this reaction is the committed step in that latter polyamine pathway. In the urea cycle, ornithine is instead
Ornithine_decarboxylase
Class of enzymes
squalene, with the consumption of NADPH. Catalysis by SQS is the first committed step in sterol synthesis, since the squalene produced is converted exclusively
Farnesyl-diphosphate farnesyltransferase
Farnesyl-diphosphate_farnesyltransferase
Chemical compound
characterization of norcoclaurine synthase, an enzyme catalyzing the first committed step in benzylisoquinoline alkaloid biosynthesis". Plant Journal. 40 (2):
4-Hydroxyphenylacetaldehyde
Biological molecules constituting nucleic acids
glycine (N&C), aspartate (N), folic acid (C1), or CO2. This is the committed step in purine synthesis. The reaction occurs with the inversion of configuration
Nucleotide
Large biological molecule that acts as a catalyst
first enzymes of the pathway (usually the first irreversible step, called committed step), thus regulating the amount of end product made by the pathways
Enzyme
Chemical compound
treatment of primary hyperoxaluria. By inhibiting the final and only committed step in hepatic oxalate synthesis, CHK-336 could in principle treat all forms
CHK-336
Class of chemical compounds: Red pigments
G, Breitel D, Grossman N, et al. (2016). "Elucidation of the first committed step in betalain biosynthesis enables the heterologous engineering of betalain
Betalain
Class of enzymes
trans-cinnamate + NH3 Phenylalanine ammonia lyase (PAL) is the first and committed step in the phenyl propanoid pathway and is therefore involved in the biosynthesis
Phenylalanine_ammonia-lyase
delay learning to drive. Ty talks to Cassandra, she realizes she wants a committed relationship with Caleb. Georgie decides to face her fears and has Tim
List_of_Heartland_episodes
Enzyme
It is a zinc-dependent metalloamidase that catalyses the second and committed step in the biosynthesis of lipid A. Lipid A anchors lipopolysaccharide (the
UDP-3-O-N-acetylglucosamine deacetylase
UDP-3-O-N-acetylglucosamine_deacetylase
Class of organic compounds
and protozoa, as well as the α-proteobacteria group of bacteria, the committed step for porphyrin biosynthesis is the formation of δ-aminolevulinic acid
Porphyrin
ring opening of guanosine triphosphate (GTP). This reaction is the committed step in the biosynthesis of multiple coenzymes (such as riboflavin and folate)
GTP_cyclohydrolase
Class of enzymes
bifunctional enzyme with GTP cyclohydrolase II that catalyses the first committed step in the biosynthesis of riboflavin. No sequences with significant homology
3,4-dihydroxy-2-butanone-4-phosphate synthase
3,4-dihydroxy-2-butanone-4-phosphate_synthase
Carboxylic acid
carboxylated by acetyl-CoA carboxylase into malonyl-CoA, the first committed step in the synthesis of fatty acids. Malonyl-CoA is then involved in a repeating
Fatty_acid
Protein family
cofactor, NAD+. The reaction this enzyme catalyses represents the first committed step in the production of all inositol-containing compounds, including phospholipids
Inositol-3-phosphate_synthase
Class of chemical compounds
a phosphocholine from phosphatidylcholine to a ceramide. The first committed step of sphingomyelin synthesis involves the condensation of L-serine and
Sphingomyelin
Token used in addiction programs
5 in) in diameter. In other twelve-step programs it is to mark time abstaining from whatever the recipient has committed to renounce. There is no official
Sobriety_coin
Enzyme
decarboxylation of a C4 molecule, creating a C3 molecule. As the first committed step in gluconeogenesis, PEPCK decarboxylates and phosphorylates oxaloacetate
Phosphoenolpyruvate carboxykinase
Phosphoenolpyruvate_carboxykinase
United States federal statute
powder cocaine convictions—retroactively. Under the First Step Act, prisoners who committed offenses "covered" by the Fair Sentencing Act are permitted
First_Step_Act
Species of virus
peptidoglycan by binding to MurA, which catalyzes the first enzymatically committed step in cell wall biosynthesis. RNA from Bacteriophage Qβ was used by Sol
Bacteriophage_Qbeta
Type of plant tissue culture
Petit Havana SR1) hairy roots for the production of geraniol, the first committed step in terpenoid indole alkaloid pathway". Journal of Biotechnology. 176:
Hairy_root_culture
Set of biological processes
carboxylated by acetyl-CoA carboxylase into malonyl-CoA, the first committed step in the synthesis of fatty acids. Acetyl-CoA is formed into malonyl-CoA
Fatty_acid_metabolism
Metabolic enzyme PHGDH
transition of 3-phosphoglycerate into 3-phosphohydroxypyruvate, which is the committed step in the phosphorylated pathway of L-serine biosynthesis. It is also essential
Phosphoglycerate dehydrogenase
Phosphoglycerate_dehydrogenase
Rare autosomal recessive human diseases
transition of 3-phosphoglycerate into 3-phosphohydroxypyruvate, which is the committed step in the phosphorylated pathway of L-serine biosynthesis. It is also essential
D-glycerate dehydrogenase deficiency
D-glycerate_dehydrogenase_deficiency
Phosphatidylcholine biosynthetic process
cells phosphorylate choline by the enzyme choline kinase, the first committed step of CDP-choline pathway. Choline kinase (CK) is a cytosolic protein that
CDP-choline_pathway
American actor (born 1982)
Awards for Shadowhunters. Shum has appeared in the films Step Up 2: The Streets (2008), Step Up 3D (2010), White Frog (2012), Revenge of the Green Dragons
Harry_Shum_Jr.
Prime Minister of Israel (1996–1999; 2009–2021; 2022–present)
Americans thought Israel had committed war crimes against Palestinians, while 29% did not, and 39% thought it had committed genocide, while 51% did not
Benjamin_Netanyahu
RNA family
carbamoyl phosphate synthase, which is an enzyme that catalyzes the first committed step in pyrimidine and arginine biosynthesis. CarA ncRNA has been found in
CarA_ncRNA_motif
Chemical compound
Bouwmeester HJ (August 1998). "(+)-Germacrene A Biosynthesis : The Committed Step in the Biosynthesis of Bitter Sesquiterpene Lactones in Chicory". Plant
Absinthin
Global conflict from 1939 to 1945
mass rape. Soviet soldiers also committed mass rapes in occupied territories, especially Germany. War crimes were committed by the Western Allied powers
World_War_II
Set of biochemical processes
AK-III catalyzes the phosphorylation of aspartic acid that is the committed step in this biosynthetic pathway. Aspartate kinase becomes downregulated
Amino_acid_synthesis
Class of enzymes
3-α(S)-strictosidine Since the condensation of tryptamine and secologanin is the first committed step in alkaloid synthesis, strictosidine synthase plays a fundamental role
Strictosidine_synthase
Approach to finding numerical solutions of ordinary differential equations
errors committed in each step. The number of steps is easily determined to be ti−t0h, which is proportional to 1h, and the error committed in each step is
Euler_method
Process of fatty acid breakdown
mitochondria in eukaryotes to generate acetyl-CoA. The acetyl-CoA product of this step of fatty acid metabolism enters the citric acid cycle, generating NADH and
Beta_oxidation
Konig WA, Bouwmeester HJ (1998). "(+)-Germacrene A Biosynthesis : The Committed Step in the Biosynthesis of Bitter Sesquiterpene Lactones in Chicory". Plant
Germacrene-A_synthase
Protein family
2015). "The bacterial signal transduction protein GlnB regulates the committed step in fatty acid biosynthesis by acting as a dissociable regulatory subunit
Pii nitrogen regulatory proteins
Pii_nitrogen_regulatory_proteins
Protein-coding gene in the species Homo sapiens
coenzyme A (CoA) in bacteria and mammalian cells. It catalyzes the first committed step in the universal biosynthetic pathway leading to CoA and is itself subject
PANK1
Industrialist and technologist (born 1971)
presidential election. Musk also promised to step down as CEO after a Twitter poll, and five months later, Musk stepped down as CEO and transitioned his role
Elon_Musk
American politician and attorney (born 1942)
Growth, Regulatory Relief and Consumer Protection Act in 2018, the First Step Act, and the Great American Outdoors Act, and confirmed a record number of
Mitch_McConnell
of Ginkgo biloba levopimaradiene synthase which catalyzes the first committed step in ginkgolide biosynthesis". Archives of Biochemistry and Biophysics
Levopimaradiene_synthase
Pharaoh of Egypt from 51 to 30 BC
Actium, Octavian's forces invaded Egypt in 30 BC and defeated Antony, who committed suicide. After his death, Cleopatra reportedly killed herself, probably
Cleopatra
Chemical reaction
product. All steps of the Henry reaction are reversible. The lack of a committed step in the reaction is a practical problem, with low yields common because
Henry_reaction
Chemical compound
carboxylation by acetyl-CoA carboxylase into malonyl CoA, the first committed step in the synthesis of fatty acids. This conversion occurs primarily in
Acetyl-CoA
Class of enzyme
barrel topology. The conversion of chorismate to prephenate is the first committed step in the pathway to the production of the aromatic amino acids: tyrosine
Chorismate_mutase
Chemical compound
Sarrion-Perdigones A, Weithorn E, Pliner M, et al. (2016). "Elucidation of the first committed step in betalain biosynthesis enables the heterologous engineering of betalain
L-DOPA
temperate Asian native flowering plant, and ADS catalyzes the first committed step in the antimalarial drug artemisinin synthesis. Amorpha-4,11-diene synthase
Amorpha-4,11-diene_synthase
Class of enzymes
via an increased rate of messenger RNA degradation. CHS, as the first committed step in the flavonoid pathway, facilitate production of flavanoids, isoflavonoid-type
Chalcone_synthase
Protein family
molecules of farnesyl diphosphate (FPP) into squalene. It is the first committed step in the cholesterol biosynthetic pathway. The reaction carried out by
Squalene/phytoene synthase family
Squalene/phytoene_synthase_family
Japanese samurai class woman
and once again attacked Osaka Castle. Yodo-dono and her son, Hideyori, committed suicide as Osaka Castle burned, ending the Toyotomi legacy. No eyewitness
Yodo-dono
American football player (born 2007)
Lyons has committed to BYU". Deseret News. Retrieved June 24, 2025. Toone, Trent (February 10, 2023). "Why top recruit Walker Lyons is stepping away from
Ryder_Lyons
American anthology series (1959–1961)
Alcoa Presents: One Step Beyond (also known as One Step Beyond) is an American anthology series created by Merwin Gerard. The original series was broadcast
Alcoa Presents One Step Beyond
Alcoa_Presents_One_Step_Beyond
Protein-coding gene in humans
coenzyme A (CoA) in bacteria and mammalian cells. It catalyzes the first committed step in the universal biosynthetic pathway leading to CoA and is itself subject
PANK4
Protein-coding gene in the species Homo sapiens
encodes a 1-phosphatidylinositol 4-kinase which catalyzes the first committed step in the biosynthesis of phosphatidylinositol 4,5-bisphosphate. The mammalian
PI4KA
American politician (born 1973)
on raising money from small donors. Around the 2024 election, Martin committed to publicly releasing a 2024 campaign post-mortem, which the DNC did not
Ken_Martin
Email service provided by Google
Gmail supports two-step verification, an optional additional measure for users to protect their accounts when logging in. Once 2-Step Verification (2SV)
Gmail
Class of enzymes
Irino F, Yoneyama N, Fujimura T, Ashihara H (July 2003). "The first committed step reaction of caffeine biosynthesis: 7-methylxanthosine synthase is closely
7-methylxanthosine_synthase
Organisation
care professionals committed to the practice of medical genetics. Melanie J. Wells, MPH, CAE, was named CEO in April 2023 and stepped down in November 2025
American College of Medical Genetics and Genomics
American_College_of_Medical_Genetics_and_Genomics
Annual custom originating in England
seemed to support Arminianism, regarded by Puritans such as Henry Burton as a step toward Catholicism. By 1636, under the leadership of the Arminian Archbishop
Guy_Fawkes_Night
Hill. Retrieved January 12, 2023. Pillen also noted that Ricketts has committed to running in 2024 and 2026 Vakil, Caroline (July 8, 2025). "Dan Osborn
2026 United States Senate elections
2026_United_States_Senate_elections
Concept in international law
certain crimes committed as part of a large-scale attack against civilians. Unlike war crimes, crimes against humanity can be committed during both peace
Crimes_against_humanity
Chemical reactions and pathways
capsulatus. Anaerobic pathway in which cobalt insertion is the first committed step towards cobalamin synthesis; found in Salmonella typhimurium, Bacillus
Cobalamin_biosynthesis
American multinational technology company
Retrieved March 9, 2017. Spellman, Peter (2009). Indie business power : a step-by-step guide for 21st century music entrepeneurs. [Boston, Mass] : Music Business
Family of transferases enzymes
2014). "Structure and Mechanism of Soybean ATP Sulfurylase and the Committed Step in Plant Sulfur Assimilation". Journal of Biological Chemistry. 289
Sulfate_adenylyltransferase
Biochemical process in which fatty acids are derived from acetyl-CoA and NADPH
carboxylated by acetyl-CoA carboxylase into malonyl-CoA, the first committed step in the synthesis of fatty acids. The main fuel stored in the bodies
Fatty_acid_synthesis
Child of a parent's sibling
and Maria of Montferrat. Step-cousins are either stepchildren of an individual's aunt or uncle, nieces and nephews of one's step-parent, or the children
Cousin
Israeli general and politician (born 1960)
democratic state, committed to the values of the Declaration of Independence, committed to passing a law of service for all, and committed to dismantling
Gadi_Eisenkot
Both before and during World War II, the Empire of Japan committed numerous war crimes and crimes against humanity across various Asia-Pacific nations
Japanese_war_crimes
Legality of sexual relationships between family members
and their natural or adoptive child, a step-parent and their step-child, whether the step-child's parent and step-parent are married under the Marriage
Legality_of_incest
American businessman (born 1964)
committed to doing our part and filling this capital need by coming together in a new coalition. We will form a network of private capital committed to
Jeff_Bezos
American football player (born 1996)
the program before he could matriculate. Finally, in December 2014, he committed to attending Troy University and playing football for the Trojans. He
Gardner_Minshew
American politician and lawyer (born 1962)
regarding Paxton to the General Investigating Committee, alleging that he had committed various crimes, including felonies, while in office. Paxton dismissed
Ken_Paxton
Australian technology entrepreneur
entire image. Obrecht and Perkins signed the Giving Pledge in 2021 and committed to donate more than 80 per cent of their wealth through the Canva Foundation
Cliff_Obrecht
Governor of North Carolina from 2017 to 2025
"Britny's Law", which makes homicide first-degree murder if the killing was committed with malice and the defendant has been convicted of domestic violence
Roy_Cooper
Protein-coding gene in the species Homo sapiens
coenzyme A (CoA) in bacteria and mammalian cells. It catalyzes the first committed step in the universal biosynthetic pathway leading to CoA and is itself subject
PANK2
President of the United States from 1977 to 1981
and the 76th governor, one of the first of the "New South governors" committed to desegregation. After announcing his candidacy in 1976, Carter secured
Jimmy_Carter
Recessive genetic condition
two FPP leads to the formation of squalene; this represents the first committed step towards cholesterol biosynthesis. Squalene leads to the creation of
Smith–Lemli–Opitz_syndrome
Protein family
state. ATCase is a highly regulated enzyme that catalyses the first committed step in pyrimidine biosynthesis, the condensation of L-aspartate and carbamoyl
Aspartate carbamoyltransferase
Aspartate_carbamoyltransferase
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COMMITTED STEP
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