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Methionine Cysteine - Crossref

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Last Updated: 15 April 2022

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Induction by fungal elicitor of S-adenosyl-L-methionine synthetase and S-adenosyl-L-homocysteine hydrolase mRNAs in cultured cells and leaves of Petroselinum crispum.

The treatment of cultured parsley cells with fungal elicitor promotes transcription of several genes that encode specific steps in pathogen defense-related pathways. In different organs of parsley plants, there were marked variations in the mRNA levels. Both mRNAs in cultured cells as well as intact leaves were significantly stimulated by Elicitor treatment, which culminated in significant rises in S-adenosyl-L-homocle hydrolase enzyme activity in cultured cells as well as intact leaves, as well as increased S-adenosyl-L-homocysteine hydrolase enzyme activity. These findings reveal a close metabolic link between pathogen defense and an increasing turnover of activated methyl groups.

Source link: https://doi.org/10.1073/pnas.89.10.4713


Selective oxidation of cysteine and methionine in normal and senile cataractous lenses.

In normal and cataractous lenses, the oxidation state of methionine and cysteine is reported. In any protein fraction that was tested, no oxidation was found in young lenses. In one case, methionine sulfone in membrane-associated components was discovered in the methionine sulfoxide form, and methionine sulfone was present in membrane-associated samples. The results show that extensive oxidation of lens proteins occurs with cataracts and that it begins at the lens fiber membrane membrane.

Source link: https://doi.org/10.1073/pnas.77.3.1274


Regulation of 5-Methyltetrahydrofolate:Homocysteine Methyltransferase Activity by Methionine, Vitamin B 12 , and Folate in Cultured

Cells in methionine-deficient medium required additional supplementation with homocysteine, B 12 (B12), and over 40-fold higher folic acid levels than growth in methionine-supplemented medium. In extracts of BHK cells grown in media containing different amounts of the enzyme reaction's components, the enzyme reaction's activity was investigated. methyltransferase activity increased by over 4-fold when B 12 -deficient deficient medium was supplemented with optimal B 12 levels; this increase was not aided by puromycin; this was not halted by puromycin.

Source link: https://doi.org/10.1073/pnas.70.9.2585


Metal active site elasticity linked to activation of homocysteine in methionine synthases

Both enzymes' kinetic and structural investigation of the catalytic zinc sites of these two methyltransferases reveals unexpected change in zinc geometry following Hcy binding and displacement of an endogenous ligand. In both cases, a significant change of the zinc relative to the protein scaffold accompanies inversion. These structures have new data on the activation of thiols by zinc-containing enzymes and have led us to develop a model for the action of the catalytic zinc sites in these and related methyltransferases.

Source link: https://doi.org/10.1073/pnas.0709960105


Methionine catabolism in Arabidopsis cells is initiated by a γ-cleavage process and leads to S -methylcysteine and isoleucine syntheses

Except in quiescent dry mature seeds, AtMGL is present in all of the Arabidopsis organs and tissues tested, except in quiescent dry mature seeds, indicating that AtMGL is involved in Met homeostasis regulation in several situations. The naming of labeled S -adenosylmethionine, S methylmethionine, S methylmethionine, S -methylmethionine, S -methylcysteine, S methylcysteine, and isoleucine was also found in identified Arabidopsis cells cultured with [13 C]Met helps identify identified arabidopsis cells fed with [13 C]Met allowed us to identify cytomethionine, adeno adenomethylmethionine, [ 13 C]-methionine, S methylmethionine, S methylcylmethionine, S methylcylmethionine, S methylcyleucine, isoleucine methylmethionine, isomethionine, isomethylcylmethionine, isomethionine, iso [13 C]-methylmethionine, isosylmethionine, iso methylmethionine, iso Indeed, we showed that part of Met cleavage's methanethiol may react with an activated form of serine to produce SMC. Met catabolism in Arabidopsis cells is triggered by a cleavage process that can result in the formation of the essential amino acid Ile and a potential storage form for sulfide or methyl groups, according to SMC.

Source link: https://doi.org/10.1073/pnas.0606195103


S -adenosylhomocysteine hydrolase deficiency in a human: A genetic disorder of methionine metabolism

Multiple abnormal myelin results were seen in muscle scopy; liver biopsy revealed mild hepatitis with sparse rough endoplasmic reticulum; muscle biopsy revealed mild hepatitis with sparse irregular endoplasmic reticulum. The white matter atrophy and abnormally slow myelination were discovered by Brain MRI at 12. 7 months. Hypermethioninemia was present in the first metabolic study at age 8 months and continued without tyrosine elevation. Plasma total homocysteine was only marginally different for an infant to 14. 5 to 15. 9 mM. S -adenosylmethionine increased 30-fold in plasma, while AdoHcy was up by 150 percent. AdoHcy hydrolase activity in liver was 3% of that of control, and it was 5–10 percent of the control values in red blood cells and cultured fibroblasts. Low phosphatidylcholine and choline were detected in plasma by low amounts of phosphatidylcholine and choline, as well as elevated amounts of phosphatidylcholine, betaine, dimethylglycine, and cystathionine. Two mutations in exon 4 were discovered: a maternally derived stop codon and a paternally related missense mutation, according to gene analysis.

Source link: https://doi.org/10.1073/pnas.0400658101


The Role of Cysteine Partitioning into Glutathione and Methionine Synthesis During Normal and Stress Conditions

The flux toward Met synthesis is high under non-stress conditions, according to our findings, which are based on flux analysis and measurements of Met-metabolites, but under stress conditions, the flux is significantly reduced. We discovered that GSH down controls the expression level of CGS, thus lowering Met synthesis by using three different methods. These results show that Cys is channelled toward both directions to encourage GSH accumulation and the creation of growth-essential Met metabolites under normal growth conditions. However, during oxidative stress, where a high level of GSH is required to shield the plants is required to shield the plants, the plants' growth is elevated while those of CGS are reduced. In addition, we've also investigated the effects of elevated GSH levels on the transcriptome profile. These results show that GSH levels in plants have an effect on various pathways and metabolites.

Source link: https://doi.org/10.32747/2013.7699850.bard


Abstract 3012: Significant Genome Wide Association Identified Between the Glycine N-Methyltransferase Gene (GNMT) and Post-Methionine Load Test Homocysteine Levels in the Vitamin Intervention for Stroke Prevention (VISP) Cohort

The Vitamin Intervention for Stroke Prevention trial was a multi-center, controlled, double blind clinical trial designed to determine whether or not the daily intake of high dose folic acid, vitamins B6 and B12 reduced recurrent cerebral infarction. In VISP, baseline post-methionine load homocysteine levels were indicative of recurrent stroke risk. We've conducted a genome-wide association survey, looking at 2100 VISP stroke cases that were expected to have homocysteine levels greater than the 25th percentile at enrolment. In the chromosome 6 region, change in homocysteine levels pre and post-methionine load test has also resulted in high GWAS scores. Inferring functional differences due to GNMT variants, cases presenting the minor allele haplotype at the underlying loci had a higher degree of post-methionine load homocysteine than those carrying the main allele haplotype haplotype.

Source link: https://doi.org/10.1161/str.43.suppl_1.a3012


Dietary Supplementation With Methionine and Homocysteine Promotes Early Atherosclerosis but Not Plaque Rupture in ApoE-Deficient Mice

In 99 atherosclerosis-prone apolipoprotein E-deficient mice, we investigated the short- and long-term effects of hyperhomocysteinemia on plaque size and structure. Plasma total homocysteine levels increased by 4- to 16-fold over those found in mice fed a control diet. Compared to controls, the aortic root plaque size in supplemented groups was significantly higher after 3 months than not after 12 months. Both control and supplemented mice had rupture prone plaques, but all aortic root plaques and all but one coronary plaque had an intact surface without rupture or thrombosis.

Source link: https://doi.org/10.1161/hq0901.096582

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions