scholarly journals Growth Prediction of Chicks from Dietary Amino Acid Profiles with Special Reference to Interactions between Sulfur-Containing and Aromatic Amino Acids.

1991 ◽  
Vol 28 (3) ◽  
pp. 147-158
Author(s):  
Supaporn ISARIYODOM ◽  
Hiroshi OHSHIMA ◽  
Masahiro GOTO ◽  
Jun-ichi OKUMURA ◽  
Tatsuo MURAMATSU
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Special Reference ◽  
Aromatic Amino Acids ◽  
Growth Prediction ◽  
Dietary Amino Acid ◽  
Amino Acid Profiles ◽  
Sulfur Containing

Effect of Hemodiabsorption and Sorbent-Based Pheresis on Amino Acid Levels in Hepatic Failure

2000 ◽  
Vol 23 (6) ◽  
pp. 375-388 ◽  
Author(s):  
J. Steczko ◽  
K.C. Bax ◽  
S.R. Ash
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Hepatic Failure ◽  
High Performance ◽  
Aromatic Amino Acids ◽  
Dialysis Unit ◽  
Amino Acid Profiles ◽  
Amino Acid Levels ◽  
Pre Treatment ◽  
Branched Chain

Changes in plasma amino acid concentrations were measured in patients with hepatic failure during extracorporeal hemodiabsorption (using the Liver Dialysis Unit, “the Unit”) or hemodiabsorption plus sorbent-based pheresis treatment (using the Liver Dialysis Plasmafilter Unit, “the PF-Unit”) Systems. Eight patients with hepatic failure, grade 3 or 4 encephalopathy, elevated bilirubin and/or creatinine levels and respiratory or renal failure were treated for 1–3 days with the Unit alone. Three of these were also treated with the Unit containing 10 g of BCAA in the sorbent suspension. Four patients with hepatic failure treated with the PF Unit also had 10 g of branched chain amino acid (BCAA) added to the sorbents of the Unit portion of this device. Pre- and post-plasma samples were drawn and high performance liquid chromatography (HPLC) was used to separate and detect amino acids in the plasma. Both the Unit and the PF-Unit have the capability to selectively remove various amino acids, especially aromatic amino acids (AAA). The pre-treatment amino acid profiles of plasma were typical for hepatic failure, with abnormally high levels of phenylalanine, tyrosine, tryptophan, and methionine and decreased levels of valine, leucine and isolucine. The average pre-treatment Fischer ratio (BCAA/AAA) for both Unit and PF-Unit patients was 1.43 (±0.58). Treatments by both systems resulted in an increase of BCAA levels in blood and concomitant decrease of AAA levels, with an average Fischer ratio improvement of 30–38% for the Unit and PF-Unit without BCAA. The Fischer ratio improved by 90% (average) for the Unit with BCAA. Levels of many other amino acids (such as alanine, glycine, proline or lysine) increased during both Unit and PF-Unit treatments. The removal of strongly protein-bound toxin and amino acids such as tryptophan and sulphydryl amino acids was more effective by the PF-Unit. Both the Unit and the PF-Unit have the unique capability to remove toxic aromatic amino acids while increasing BCAA levels in patient. The increase in many amino acid levels may be related to the removal of toxins that interfere with normal amino acid metabolism. The addition of the PF module improves the removal of bilirubin and similarly protein-bound chemicals. Changes in amino acid profiles by the Unit and the PF-Unit contrast markedly with other extracorporeal devices.

scholarly journals Long-Term Carbohydrate-Containing Late-Evening Snack Significantly Improves the Ratio of Branched Chain Amino Acids to Aromatic Amino Acids in Adults with Liver Cirrhosis due to Hepatitis B

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wei Hou ◽  
Zheng Lv ◽  
Jing Yang ◽  
Jing Wu ◽  
Zhong-ying Wang ◽  
...  
Keyword(s):  
Amino Acids ◽  
Liver Cirrhosis ◽  
Chronic Hepatitis ◽  
Amino Acid ◽  
Aromatic Amino Acids ◽  
Branched Chain Amino Acids ◽  
Plasma Amino Acid ◽  
Amino Acid Profiles ◽  
Late Evening ◽  
Branched Chain

Background. The liver is the primary organ for amino acid metabolism, and metabolic disorder of amino acids is common in liver disease. However, the characteristics of plasma amino acid profiles in patients with HBV-related cirrhosis and the impacts of late-evening snack (LES) on cirrhosis are unclear. Objectives. To investigate the characteristics of plasma amino acid profiles in patients with HBV-related chronic hepatitis, cirrhosis, and the effects of late-evening snacks on plasma amino acid profiles. Methods. 86 patients with HBV-related cirrhosis and eighty patients with chronic hepatitis B were included in this study. The plasma amino acid profiles were measured by the amino acid analyzer. Patients were randomly divided into two groups, of which the liver cirrhosis group was to receive daily LES ( n = 43 ) or non-LES ( n = 43 ) for 6 months. Plasma amino acid profiles and biochemical parameters were measured in both groups at baseline and after 1, 3, and 6 months. Results. Compared to healthy controls, the plasma concentration in the liver cirrhosis group of threonine, serine, glycine, glutamine, cysteine, tyrosine, phenylalanine, arginine, and methionine increased significantly ( P < 0.05 ), while the ratio of branched chain amino acids (BCAA) to aromatic amino acids (AAA) decreased significantly ( P < 0.05 ). A carbohydrate-predominant LES treatment resulted in a significant increase in BCAA/AAA and decrease in the level of ammonia and glutamine compared with baseline after 6 months of supplementation ( P < 0.05 ). Patients with Child-Pugh B and C are more responsive to changes in amino acid profiles than those with Child-Pugh A. Conclusions. The application of an LES carbohydrate module for six months in liver cirrhosis patients was associated with increased BCAA/AAA and decreased level of ammonia. Patients with Child-Pugh B and C grades were the most beneficial population.

scholarly journals Enhanced catalytic efficiency and universality of L-amino acid deaminase achieved by a shorter proton transfer distance

2021 ◽  
Author(s):  
Yaoyun Wu ◽  
Sheng Zhang ◽  
Wei Song ◽  
Jia Liu ◽  
Xiulai Chen ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Catalytic Mechanism ◽  
Aromatic Amino Acids ◽  
Catalytic Efficiency ◽  
Charged Amino Acids ◽  
Keto Acids ◽  
Key Factor ◽  
Limiting Efficiency ◽  
Sulfur Containing

L-amino acid deaminase (LAAD, EC 1.4.3.2) catalyzes the deamination of α-amino acids. At present, sustainable enzymatic α-keto acids synthesis remains limited by the low catalytic efficiency of wild-type LAADs. In this study, catalytic mechanism was elucidated, and catalytic distance D1 between the substrate αC-H and the cofactor FAD N(5) was identified as the key factor limiting efficiency of Proteus mirabilis PmiLAAD. Shortening the distance via protein engineering improved catalytic efficiency toward six selected amino acids. The two variants with the best catalytic properties were W1, which exhibited a preference for short-chain aliphatic amino acids and charged amino acids, and W2, which showed a preference for large aromatic amino acids and sulfur-containing amino acids. The mutated residues in the two variants altered the binding pose of the substrate, α-hydrogen was improved to be more perpendicular against the plain of the isoalloxazine ring causing the angle between the substrates’ αC-H, FAD N(5), and FAD N(10) to approach 90°, and thus shortened the distance. Finally, W1 and W2 were cascade in one Escherichia coli cell to obtain strain S3, which exhibited conversion >90% and yield >100 g/L toward all selected substrates. These results provide the basis for improving industrial production of α-keto acids via microbial deamination of α-amino acids.

Single Amino Acid Based Self-Assemblies of Cysteine and Methionine

2018 ◽  
Author(s):  
Nidhi Gour ◽  
Bharti Koshti ◽  
Chandra Kanth P. ◽  
Dhruvi Shah ◽  
Vivek Shinh Kshatriya ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Self Assembly ◽  
Aromatic Amino Acids ◽  
Neutral Condition ◽  
Single Amino Acid ◽  
Binding Assays ◽  
Human Neuroblastoma ◽  
Cytotoxicity Assays ◽  
First Time

We report for the very first time self-assembly of Cysteine and Methionine to discrenible strucutres under neutral condition. To get insights into the structure formation, thioflavin T and Congo red binding assays were done which revealed that aggregates may not have amyloid like characteristics. The nature of interactions which lead to such self-assemblies was purported by coincubating assemblies in urea and mercaptoethanol. Further interaction of aggregates with short amyloidogenic dipeptide diphenylalanine (FF) was assessed. While cysteine aggregates completely disrupted FF fibres, methionine albeit triggered fibrillation. The cytotoxicity assays of cysteine and methionine structures were performed on Human Neuroblastoma IMR-32 cells which suggested that aggregates are not cytotoxic in nature and thus, may not have amyloid like etiology. The results presented in the manuscript are striking, since to the best of our knowledge,this is the first report which demonstrates that even non-aromatic amino acids (cysteine and methionine) can undergo spontaneous self-assembly to form ordered aggregates.

scholarly journals Changes in Amino Acid Profiles and Bioactive Compounds of Thai Silk Cocoons as Affected by Water Extraction

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2033
Author(s):  
Chuleeporn Bungthong ◽  
Sirithon Siriamornpun
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Biological Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Silk Protein ◽  
Extraction Time ◽  
Antioxidant Power ◽  
Silk Cocoon ◽  
Amino Acid Profiles

Silk proteins have many advantageous components including proteins and pigments. The proteins—sericin and fibroin—have been widely studied for medical applications due to their good physiochemical properties and biological activities. Various strains of cocoon display different compositions such as amino-acid profiles and levels of antioxidant activity. Therefore, the objectives of this study were to find a suitable silk protein extraction method to obtain products with chemical and biological properties suitable as functional foods in two strains of Bombyx mori silk cocoon (Nangsew strains; yellow cocoon) and Samia ricini silk cocoon (Eri strains; white cocoon) extracted by water at 100 °C for 2, 4, 6 and 8 h. The results showed that Nangsew strains extracted for 6 h contained the highest amounts of protein, amino acids, total phenolics (TPC) and total flavonoids (TFC), plus DPPH radical-scavenging activity, ABTS radical scavenging capacity, and ferric reducing antioxidant power (FRAP), anti-glycation, α-amylase and α-glucosidase inhibition. The longer extraction time produced higher concentrations of amino acids, contributing to sweet and umami tastes in both silk strains. It seemed that the bitterness decreased as the extraction time increased, resulting in improvements in the sweetness and umami of silk-protein extracts.

scholarly journals Are Dietary Amino Acids or Protein Quality Associated with Infant Length Gain from 6 to 12 Months in Rural Malawi? (P10-010-19)

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Andrew Matchado ◽  
Kathryn Dewey ◽  
Christine Stewart ◽  
Per Ashorn ◽  
Ulla Ashorn ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Breast Milk ◽  
Protein Quality ◽  
Complementary Food ◽  
Complementary Foods ◽  
Acid Intake ◽  
Dietary Amino Acid ◽  
Amino Acid Intake ◽  
Length Gain

Abstract Objectives 1) to estimate the probability of inadequate amino acid intake among infants 9–10 months of age in rural Malawi 2) to evaluate whether dietary amino acid intake or protein quality are associated with length gain from 6 to 12 months of age Methods We assessed total amino acid intake from breast milk and complementary foods in 285 infants. Breast milk intake and complementary foods were estimated using dose-to-mother deuterium oxide dilution method and repeat 4-pass interactive 24-hour recall interviews, respectively. Amino acid composition values were taken from FAO human milk profile, Tanzania Food Composition table and International Minilist. Protein quality was estimated using Digestible Indispensable Amino Acid Score (DIAAS). Probability of intake below Estimated Average Requirement (EAR) for each amino acid was estimated using National Cancer Institute (NCI) method. We estimated protein quality of complementary food using median DIAAS. We assumed a DIAAS of ≥0.75 to represent a diet or food with good protein quality. Relationships between amino acid intake or protein quality with length gain were assessed using regression models. Length was measured at 6 and 12 months of age and length for age z-score (LAZ) velocity was calculated (ΔLAZ/months). Results The probability of inadequate amino acid intake from breast milk and complementary food that included a lipid-based nutrient supplement (LNS) was 3% for lysine, 0% for tryptophan, threonine, valine, histidine, isoleucine, leucine, sulfur containing amino acids (SAA), and aromatic amino acids (AAA). Without LNS, the probability was 7% for lysine and 0–2% for the other amino acids. The median (interquartile range) DIAAS for complementary food with and without LNS was 0.70 (0.28) and 0.64 (0.32), respectively. Dietary amino acid intake and protein quality were not significantly associated with length gain velocity from 6 to 12 months even after adjusting for confounding factors. Conclusions The prevalence of inadequate amino acid intake in 9–10 months old infants in rural Malawi is very low. However, in conditions of frequent clinical or sub-clinical infections this situation may be different. Linear growth at 6–12 months does not appear to be limited by dietary amino acid intake or protein quality in this setting. Funding Sources The Bill & Melinda Gates Foundation.

Characterization of an isozyme of S-adenosylmethionine synthetase from rat liver

1984 ◽  
Vol 62 (5) ◽  
pp. 276-279 ◽  
Author(s):  
C. H. Lin ◽  
W. Chung ◽  
K. P. Strickland ◽  
A. J. Hudson
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Amino Acid ◽  
Enzymatic Synthesis ◽  
Gel Filtration ◽  
Deae Cellulose ◽  
Aromatic Amino Acids ◽  
Adenosylmethionine Synthetase ◽  
Cellulose Column

An isozyme of S-adenosylmethionine synthetase has been purified to homogeneity by ammonium sulfate fractionation, DEAE-cellulose column chromatography, and gel filtration on a Sephadex G-200 column. The purified enzyme is very unstable and has a molecular weight of 120 000 consisting of two identical subunits. Amino acid analysis on the purified enzyme showed glycine, glutamate, and aspartate to be the most abundant and the aromatic amino acids to be the least abundant. It possesses tripolyphosphatase activity which can be stimulated five to six times by S-adenosylmethionine (20–40 μM). The findings support the conclusion that an enzyme-bound tripolyphosphate is an obligatory intermediate in the enzymatic synthesis of S-adenosylmethionine from ATP and methionine.

scholarly journals Serum Amino Acid Profiles in Childhood Predict Triglyceride Level in Adulthood: A 7-Year Longitudinal Study in Girls

2016 ◽  
Vol 101 (5) ◽  
pp. 2047-2055 ◽  
Author(s):  
Petri Wiklund ◽  
Xiaobo Zhang ◽  
Xiao Tan ◽  
Sirkka Keinänen-Kiukaanniemi ◽  
Markku Alen ◽  
...  
Keyword(s):  
Amino Acids ◽  
Longitudinal Study ◽  
Amino Acid ◽  
High Risk ◽  
Triglyceride Level ◽  
Early Adulthood ◽  
Health Science ◽  
Model Assessment ◽  
Pubertal Growth ◽  
Amino Acid Profiles

AbstractContext:Branched-chain and aromatic amino acids are associated with high risk of developing dyslipidemia and type II diabetes in adults.Objective:This study aimed to examine whether serum amino acid profiles associate with triglyceride concentrations during pubertal growth and predict hypertriglyceridemia in early adulthood.Design:This was a 7.5-year longitudinal study.Setting:The study was conducted at the Health Science Laboratory, University of Jyväskylä.Participants:A total of 396 nondiabetic Finnish girls aged 11.2 ± 0.8 years at the baseline participated in the study.Main Outcome Measures:Body composition was assessed by dual-energy x-ray absorptiometry; serum concentrations of glucose, insulin, and triglyceride by enzymatic photometric methods; and amino acids by nuclear magnetic resonance spectroscopy.Results:Serum leucine and isoleucine correlated significantly with future triglyceride, independent of baseline triglyceride level (P &lt; .05 for all). In early adulthood (at the age of 18 years), these amino acids were significantly associated with hypertriglyceridemia, whereas fat mass and homeostasis model assessment of insulin resistance were not. Leucine was the strongest determinant discriminating subjects with hypertriglyceridemia from those with normal triglyceride level (area under the curve, 0.822; 95% confidence interval, 0.740–0.903; P = .000001).Conclusions:Serum leucine and isoleucine were associated with future serum triglyceride levels in girls during pubertal growth and predicted hypertriglyceridemia in early adulthood. Therefore, these amino acid indices may serve as biomarkers to identify individuals at high risk for developing hypertriglyceridemia and cardiovascular disease later in life. Further studies are needed to elucidate the role these amino acids play in the lipid metabolism.

scholarly journals Involvement of calcium-sensing receptor activation in the alleviation of intestinal inflammation in a piglet model by dietary aromatic amino acid supplementation

2018 ◽  
Vol 120 (12) ◽  
pp. 1321-1331 ◽  
Author(s):  
Hongnan Liu ◽  
Bie Tan ◽  
Bo Huang ◽  
Jianjun Li ◽  
Jing Wang ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Inflammatory Cytokines ◽  
Intestinal Inflammation ◽  
Aromatic Amino Acids ◽  
Dietary Supplementation ◽  
Basal Diet ◽  
Signalling Pathway ◽  
Protein Levels ◽  
Pro Inflammatory Cytokines

AbstractCa2+-sensing receptor (CaSR) represents a potential therapeutic target for inflammatory bowel diseases and strongly prefers aromatic amino acid ligands. We investigated the regulatory effects of dietary supplementation with aromatic amino acids – tryptophan, phenylalanine and tyrosine (TPT) – on the CaSR signalling pathway and intestinal inflammatory response. The in vivo study was conducted with weanling piglets using a 2 × 2 factorial arrangement in a randomised complete block design. Piglets were fed a basal diet or a basal diet supplemented with TPT and with or without inflammatory challenge. The in vitro study was performed in porcine intestinal epithelial cell line to investigate the effects of TPT on inflammatory response using NPS-2143 to inhibit CaSR. Dietary supplementation of TPT alleviated histopathological injury and decreased myeloperoxidase activity in intestine challenged with lipopolysaccharide. Dietary supplementation of TPT decreased serum concentration of pro-inflammatory cytokines (IL-1β, IL-6, IL-8, IL-12, granulocyte-macrophage colony-stimulating factor, TNF-α), as well as the mRNA abundances of pro-inflammatory cytokines in intestine but enhanced anti-inflammatory cytokines IL-4 and transforming growth factor-β mRNA levels compared with pigs fed control diet and infected by lipopolysaccharide. Supplementation of TPT increased CaSR and phospholipase Cβ2 protein levels, but decreased inhibitor of NF-κB kinase α/β and inhibitor of NF-κB (IκB) protein levels in the lipopolysaccharide-challenged piglets. When the CaSR signalling pathway was blocked by NPS-2143, supplementation of TPT decreased the CaSR protein level, but enhanced phosphorylated NF-κB and IκB levels in IPEC-J2 cells. To conclude, supplementation of aromatic amino acids alleviated intestinal inflammation as mediated through the CaSR signalling pathway.

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