PhD Thesis - Cox Group
... has many similar features to polyketides’ pathway and it has always remained a model system to study the latter. Fatty acids are primary metabolites present in all living cells. Structurally they are carboxylic acids with a long saturated chain. They are important sources of fuel for an organism and ...
... has many similar features to polyketides’ pathway and it has always remained a model system to study the latter. Fatty acids are primary metabolites present in all living cells. Structurally they are carboxylic acids with a long saturated chain. They are important sources of fuel for an organism and ...
Assembly-Line Enzymology for Polyketide and Nonribosomal
... Convergent logic is followed in PKS systems in which malonyl-CoA undergoes transthiolation to yield a comparable malonyl-pantetheinyl-phospho-carrier protein before any condensation steps occur. The second central tenet is that chain elongation proceeds via coValent tethering of all the substrates, ...
... Convergent logic is followed in PKS systems in which malonyl-CoA undergoes transthiolation to yield a comparable malonyl-pantetheinyl-phospho-carrier protein before any condensation steps occur. The second central tenet is that chain elongation proceeds via coValent tethering of all the substrates, ...
Exploring the Biosynthetic Potential of Cystobacter fuscus
... Vorveröffentlichungen der Dissertation Teile dieser Arbeit wurden vorab mit Genehmigung der NaturwissenschaftlichTechnischen Fakultät III, vertreten durch den Mentor der Arbeit, in folgenden Beiträgen veröffentlicht oder sind derzeit in Vorbereitung zur Veröffentlichung: ...
... Vorveröffentlichungen der Dissertation Teile dieser Arbeit wurden vorab mit Genehmigung der NaturwissenschaftlichTechnischen Fakultät III, vertreten durch den Mentor der Arbeit, in folgenden Beiträgen veröffentlicht oder sind derzeit in Vorbereitung zur Veröffentlichung: ...
Carotenoids Biosynthesis – a review
... chloroplast isoprenoids, the addition of a C2 precursor (derived from pyruvate, most likely by formation of hydroxyethyl thiamine (TPP=thiamine diphosphate) to a C3 precursor (glyceraldehydes 3-phosphate GAP) yields a first C5 intermediate, most likely D-1-deoxyxylulose 5-phosphate [(Broers, 1994, i ...
... chloroplast isoprenoids, the addition of a C2 precursor (derived from pyruvate, most likely by formation of hydroxyethyl thiamine (TPP=thiamine diphosphate) to a C3 precursor (glyceraldehydes 3-phosphate GAP) yields a first C5 intermediate, most likely D-1-deoxyxylulose 5-phosphate [(Broers, 1994, i ...
Analysis of TETRAKETIDE a-PYRONE
... tryphine is deposited on the surface and within the chambers of exine and constitutes the pollen coat (Scott et al., 2004; Blackmore et al., 2007; Grienenberger et al., 2009), but this is a process distinct from exine formation and probably involves a distinct biosynthetic pathway or pathways. We re ...
... tryphine is deposited on the surface and within the chambers of exine and constitutes the pollen coat (Scott et al., 2004; Blackmore et al., 2007; Grienenberger et al., 2009), but this is a process distinct from exine formation and probably involves a distinct biosynthetic pathway or pathways. We re ...
Oxidation and biosynthesis of fatty acids
... synthase (condensing enzyme) Domain 2 contains acyl carrier protein, b-ketoacyl reductase, dehydratase, and enoyl reductase. ...
... synthase (condensing enzyme) Domain 2 contains acyl carrier protein, b-ketoacyl reductase, dehydratase, and enoyl reductase. ...
Functional characterization of LePGT1, a membrane
... All these conserved hydrophilic loops face one side of the biological membrane, suggesting that the conserved domains interact to mediate enzyme function, such as substrate recognition. In order to investigate the role of each conserved amino acid, sitedirected mutations were introduced into LePGT1. ...
... All these conserved hydrophilic loops face one side of the biological membrane, suggesting that the conserved domains interact to mediate enzyme function, such as substrate recognition. In order to investigate the role of each conserved amino acid, sitedirected mutations were introduced into LePGT1. ...
The biological synthesis of cholesterol
... origin of the acetoacetyl-CoA that enters into the synthesis of hydroxymethylglutarate. Conceivably the initial condensation to the four-carbon level involves an acetyl unit and a malonyl unit41 as in the synthesis of long-chain fatty acids. Energetically this mechanism is certainly more favorable t ...
... origin of the acetoacetyl-CoA that enters into the synthesis of hydroxymethylglutarate. Conceivably the initial condensation to the four-carbon level involves an acetyl unit and a malonyl unit41 as in the synthesis of long-chain fatty acids. Energetically this mechanism is certainly more favorable t ...
Post-Translational Processing (7.1)
... http://bass.bio.uci.edu/~hudel/bs99a/lecture26/lecture7_3.html (10 of 13)5/25/2007 9:41:20 AM ...
... http://bass.bio.uci.edu/~hudel/bs99a/lecture26/lecture7_3.html (10 of 13)5/25/2007 9:41:20 AM ...
Divergent evolution of the thiolase superfamily and chalcone
... (von Wettstein-Knowles et al., 2000). These elongation enzymes use acyl thioesters of ACP as substrates, but they differ in substrate specificity in that palmitoleoyl-ACP is the preferred substrate for KAS II. Closely related to these enzymes are the b-ketosynthase (KS) domains of polyketide synthase ...
... (von Wettstein-Knowles et al., 2000). These elongation enzymes use acyl thioesters of ACP as substrates, but they differ in substrate specificity in that palmitoleoyl-ACP is the preferred substrate for KAS II. Closely related to these enzymes are the b-ketosynthase (KS) domains of polyketide synthase ...
INTERMEDIARY METABOLISM
... From these studies it was concluded that purines are synthesized de novo not as free purines but first as the nucleotide inosinic acid (hypoxanthine-ribose-5'-phosphate), which is then converted into the adenine and guanine nucleotides. ...
... From these studies it was concluded that purines are synthesized de novo not as free purines but first as the nucleotide inosinic acid (hypoxanthine-ribose-5'-phosphate), which is then converted into the adenine and guanine nucleotides. ...
FIGURE 21–6 Part 1
... palmitoleate, 16:1(Δ9), and oleate, 18:1(Δ9); both of these fatty acids have a single cis double bond between C-9 and C-10. The double bond is introduced into the fatty acid chain by ...
... palmitoleate, 16:1(Δ9), and oleate, 18:1(Δ9); both of these fatty acids have a single cis double bond between C-9 and C-10. The double bond is introduced into the fatty acid chain by ...
Enzymes in jasmonate biosynthesis – Structure, function, regulation
... 2400 Å2 at the enzymes surface. Substrates appear to access the active site from within this region which is consistent with their localization in plastid membranes (Lee et al., 2008). AOSs belong to an atypical cytochrome P450 subfamily, the CYP74 enzymes. Unlike other P450s, they do not require mo ...
... 2400 Å2 at the enzymes surface. Substrates appear to access the active site from within this region which is consistent with their localization in plastid membranes (Lee et al., 2008). AOSs belong to an atypical cytochrome P450 subfamily, the CYP74 enzymes. Unlike other P450s, they do not require mo ...
Identification and characterization of the ergochrome gene cluster in
... and clavorubin could be detected as well as prominent signals of the yellow ergochrome secalonic acid. Figure 7 clearly demonstrates difference in yellow pigment signals at UV 332 nm between the OE TF and the wild type. The marked signals at 34, 35 and 36 min correspond to a m/z value of 637.1554, m ...
... and clavorubin could be detected as well as prominent signals of the yellow ergochrome secalonic acid. Figure 7 clearly demonstrates difference in yellow pigment signals at UV 332 nm between the OE TF and the wild type. The marked signals at 34, 35 and 36 min correspond to a m/z value of 637.1554, m ...
BOC-ON - Sigma
... This reagent offers a distinct advantage over t-BOC azide which can require reaction temperatures of 50-60°C (t-BOC azide is thermally unstable and decomposes with apparent detonation at temperatures above 80°C).1 The oxime by-product can be easily and completely removed from the reaction mixture by ...
... This reagent offers a distinct advantage over t-BOC azide which can require reaction temperatures of 50-60°C (t-BOC azide is thermally unstable and decomposes with apparent detonation at temperatures above 80°C).1 The oxime by-product can be easily and completely removed from the reaction mixture by ...
Chapter 7: Recent advances in enzyme technology
... present in a vast molar excess over other potential acceptor molecules so no reaction occurs other than hydrolysis. Also, the normal 'concentration' of water (about 55.5 M) is much greater than its typical Km (about 50 mM) and the rate of hydrolysis will not be affected as the reaction proceeds. By ...
... present in a vast molar excess over other potential acceptor molecules so no reaction occurs other than hydrolysis. Also, the normal 'concentration' of water (about 55.5 M) is much greater than its typical Km (about 50 mM) and the rate of hydrolysis will not be affected as the reaction proceeds. By ...
Objectives 30 - u.arizona.edu
... Figure 4. General mechanism for FAS. Addition of 2 carbons continues until palmitate is formed and then released for activation ...
... Figure 4. General mechanism for FAS. Addition of 2 carbons continues until palmitate is formed and then released for activation ...
Planta - University of Regina
... (Kreuzaler and Hahlbrock 1975). CHS is a typical homodimeric plant polyketide synthase with approx. 43kDa subunits. Based on the similarity in sequence and function, stilbene synthase (SchoÈppner and Kindl 1984), acridone synthase (Lukacin et al. 1999) and bibenzyl synthase (Preisig-MuÈller et al. 1 ...
... (Kreuzaler and Hahlbrock 1975). CHS is a typical homodimeric plant polyketide synthase with approx. 43kDa subunits. Based on the similarity in sequence and function, stilbene synthase (SchoÈppner and Kindl 1984), acridone synthase (Lukacin et al. 1999) and bibenzyl synthase (Preisig-MuÈller et al. 1 ...
10934_2017_374_MOESM1_ESM
... profiles before and after the post-treatment in order to investigate residual solvents. It is difficult to tell whether DMF molecules were fully exchanged with methanol for UiO-66 system (Figure S1 (ii)) and MOF801 (Figure S2 (ii)). Thus, we have performed TD-GC/MS to inspect residual DMF or other p ...
... profiles before and after the post-treatment in order to investigate residual solvents. It is difficult to tell whether DMF molecules were fully exchanged with methanol for UiO-66 system (Figure S1 (ii)) and MOF801 (Figure S2 (ii)). Thus, we have performed TD-GC/MS to inspect residual DMF or other p ...
Complete genome sequence of the rifamycin SV
... found in streptomycetes, this chromosome is circular, particularly similar to that of Saccharopolyspora erythraea and Nocardia farcinica, representing their close relationship in phylogeny and taxonomy. Although the predicted 9 228 protein-coding genes in the A. mediterranei genome shared the greate ...
... found in streptomycetes, this chromosome is circular, particularly similar to that of Saccharopolyspora erythraea and Nocardia farcinica, representing their close relationship in phylogeny and taxonomy. Although the predicted 9 228 protein-coding genes in the A. mediterranei genome shared the greate ...
Enzymes: “Helper” Protein molecules
... There’s an enzyme for that each enzyme needs to be the right shape for the job enzymes are named for the reaction they help ...
... There’s an enzyme for that each enzyme needs to be the right shape for the job enzymes are named for the reaction they help ...
Novel Specific Halogenating Enzymes from Bacteria
... monochlorodimedone is used together with hydrogen peroxide unspecific haloperoxidases will be selected. As hydrogen peroxide is astrong oxidizing agent it inhibits many enzymes and thus the addition of hydrogen peroxide to an assay for halogenating activity could prevent the detection of hydrogen pe ...
... monochlorodimedone is used together with hydrogen peroxide unspecific haloperoxidases will be selected. As hydrogen peroxide is astrong oxidizing agent it inhibits many enzymes and thus the addition of hydrogen peroxide to an assay for halogenating activity could prevent the detection of hydrogen pe ...
Document
... Subsystem: Archaeosine and queuosine biosynthesis All the experimental evidence generated on the biosynthesis of queuosine and other 7-deazapurine natural products point to a GTP cyclohydrolase(GCYHI) or cyclohydrolase-like reaction as the first step in the biosynthesis. While we demonstrated that ...
... Subsystem: Archaeosine and queuosine biosynthesis All the experimental evidence generated on the biosynthesis of queuosine and other 7-deazapurine natural products point to a GTP cyclohydrolase(GCYHI) or cyclohydrolase-like reaction as the first step in the biosynthesis. While we demonstrated that ...
heme
... ● globin → AAs → metabolism ● heme → bilirubin 2+ → transport with transferrin and used in the next ● Fe heme biosynthesis ...
... ● globin → AAs → metabolism ● heme → bilirubin 2+ → transport with transferrin and used in the next ● Fe heme biosynthesis ...
Biosynthesis of doxorubicin
Doxorubicin (DXR) is a 14-hydroxylated version of daunorubicin, the immediate precursor of DXR in its biosynthetic pathway. Daunorubicin is more abundantly found as a natural product because it is produced by a number of different wild type strains of streptomyces. In contrast, only one known non-wild type species, streptomyces peucetius subspecies cesius ATCC 27952, was initially found to be capable of producing the more widely used doxorubicin. This strain was created by Arcamone et al. in 1969 by mutating a strain producing daunorubicin, but not DXR, at least in detectable quantities. Subsequently, Hutchinson's group showed that under special environmental conditions, or by the introduction of genetic modifications, other strains of streptomyces can produce doxorubicin. His group has also cloned many of the genes required for DXR production, although not all of them have been fully characterized. In 1996, Strohl's group discovered, isolated and characterized dox A, the gene encoding the enzyme that converts daunorubicin into DXR. By 1999, they produced recombinant Dox A, a Cytochrome P450 oxidase, and found that it catalyzes multiple steps in DXR biosynthesis, including steps leading to daunorubicin. This was significant because it became clear that all daunorubicin producing strains have the necessary genes to produce DXR, the much more therapeutically important of the two. Hutchinson's group went on to develop methods to improve the yield of DXR, from the fermentation process used in its commercial production, not only by introducing Dox A encoding plasmids, but also by introducing mutations to deactivate enzymes that shunt DXR precursors to less useful products, for example baumycin-like glycosides. Some triple mutants, that also over-expressed Dox A, were able to double the yield of DXR. This is of more than academic interest because at that time DXR cost about $1.37 million per kg and current production in 1999 was 225 kg per annum. More efficient production techniques have brought the price down to $1.1 million per kg for the non-liposomal formulation. Although DXR can be produced semi-synthetically from daunorubicin, the process involves electrophilic bromination and multiple steps and the yield is poor. Since daunorubicin is produced by fermentation, it would be ideal if the bacteria could complete DXR synthesis more effectively.