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Catechin pentaacetate

$960

  • Brand : BIOFRON

  • Catalogue Number : BN-O1556

  • Specification : 98%(HPLC)

  • CAS number : 16198-01-9

  • Formula : C25H24O11

  • Molecular Weight : 500.5

  • PUBCHEM ID : 3363314

  • Volume : 5mg

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Catalogue Number

BN-O1556

Analysis Method

HPLC,NMR,MS

Specification

98%(HPLC)

Storage

-20℃

Molecular Weight

500.5

Appearance

Powder

Botanical Source

This product is isolated and purified from the bark of Taxus yunnanensis

Structure Type

Flavonoids

Category

Standards;Natural Pytochemical;API

SMILES

CC(=O)OC1CC2=C(C=C(C=C2OC(=O)C)OC(=O)C)OC1C3=CC(=C(C=C3)OC(=O)C)OC(=O)C

Synonyms

2H-1-Benzopyran-3,5,7-triol, 2-[3,4-bis(acetyloxy)phenyl]-3,4-dihydro-, triacetate, (2R,3S)-/2-(3,4-Diacetoxyphenyl)-3,4-dihydro-2H-chromene-3,5,7-triyl triacetate/2H-1-Benzopyran-3,5,7-triol, 2-[3,4-bis(acetyloxy)phenyl]-3,4-dihydro-, triacetate/(2R,3S)-2-(3,4-Diacetoxyphenyl)-3,4-dihydro-2H-chromene-3,5,7-triyl triacetate

IUPAC Name

[5,7-diacetyloxy-2-(3,4-diacetyloxyphenyl)-3,4-dihydro-2H-chromen-3-yl] acetate

Density

1.4±0.1 g/cm3

Solubility

Soluble in Chloroform,Dichloromethane,Ethyl Acetate,DMSO,Acetone,etc.

Flash Point

266.6±31.5 °C

Boiling Point

624.2±55.0 °C at 760 mmHg

Melting Point

InChl

InChI=1S/C25H24O11/c1-12(26)31-18-9-21(33-14(3)28)19-11-24(35-16(5)30)25(36-22(19)10-18)17-6-7-20(32-13(2)27)23(8-17)34-15(4)29/h6-10,24-25H,11H2,1-5H3/t24-,25+/m0/s1

InChl Key

BKYWAYNSDFXIPL-LOSJGSFVSA-N

WGK Germany

RID/ADR

HS Code Reference

2933990000

Personal Projective Equipment

Correct Usage

For Reference Standard and R&D, Not for Human Use Directly.

Meta Tag

provides coniferyl ferulate(CAS#:16198-01-9) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. Articles of coniferyl ferulate are included as well.>> amp version: coniferyl ferulate

No Technical Documents Available For This Product.

PMID

26537571

Abstract

Streptococcus pneumoniae is a major cause of life-threatening diseases worldwide. Here we provide an in-depth functional characterization of LytB, the peptidoglycan hydrolase responsible for physical separation of daughter cells. Identified herein as an N-acetylglucosaminidase, LytB is involved also in colonization and invasion of the nasopharynx, biofilm formation and evasion of host immunity as previously demonstrated. We have shown that LytB cleaves the GlcNAc-β-(1,4)-MurNAc glycosidic bond of peptidoglycan building units. The hydrolysis occurs at sites with fully acetylated GlcNAc moieties, with preference for uncross-linked muropeptides. The necessity of GlcN acetylation and the presence of a single acidic moiety (Glu585) essential for catalysis strongly suggest a substrate-assisted mechanism with anchimeric assistance of the acetamido group of GlcNAc moieties. Additionally, modelling of the catalytic region bound to a hexasaccharide tripentapeptide provided insights into substrate-binding subsites and peptidoglycan recognition. Besides, cell-wall digestion products and solubilisation rates might indicate a tight control of LytB activity to prevent unrestrained breakdown of the cell wall. Choline-independent localization at the poles of the cell, mediated by the choline-binding domain, peptidoglycan modification, and choline-mediated (lipo)teichoic-acid attachment contribute to the high selectivity of LytB. Moreover, so far unknown chitin hydrolase and glycosyltransferase activities were detected using GlcNAc oligomers as substrate.

Title

Substrate recognition and catalysis by LytB, a pneumococcal peptidoglycan hydrolase involved in virulence

Author

Palma Rico-Lastres,1,2 Roberto Diez-Martinez,2,3 Manuel Iglesias-Bexiga,1,2 Noemi Bustamante,1,2 Christine Aldridge,4 Dusan Hesek,5 Mijoon Lee,5 Shahriar Mobashery,5 Joe Gray,6 Waldemar Vollmer,4 Pedro Garcia,a,2,3 and Margarita Menendezb,1,2

Publish date

2015

PMID

31515267

Abstract

Ligand-dependent differences in the regulation and internalization of the μ-opioid receptor (MOR) have been linked to the severity of adverse effects that limit opiate use in pain management. MOR activation by morphine or [d-Ala2,N-MePhe4, Gly-ol]enkephalin (DAMGO) causes differences in spatiotemporal signaling dependent on MOR distribution at the plasma membrane. Morphine stimulation of MOR activates a Gαi/o-Gβγ-protein kinase C (PKC) α phosphorylation pathway that limits MOR distribution and is associated with a sustained increase in cytosolic extracellular signal-regulated kinase (ERK) activity. In contrast, DAMGO causes a redistribution of the MOR at the plasma membrane (before receptor internalization) that facilitates transient activation of cytosolic and nuclear ERK. Here, we used proximity biotinylation proteomics to dissect the different protein-interaction networks that underlie the spatiotemporal signaling of morphine and DAMGO. We found that DAMGO, but not morphine, activates Ras-related C3 botulinum toxin substrate 1 (Rac1). Both Rac1 and nuclear ERK activity depended on the scaffolding proteins IQ motif-containing GTPase-activating protein-1 (IQGAP1) and Crk-like (CRKL) protein. In contrast, morphine increased the proximity of the MOR to desmosomal proteins, which form specialized and highly-ordered membrane domains. Knockdown of two desmosomal proteins, junction plakoglobin or desmocolin-1, switched the morphine spatiotemporal signaling profile to mimic that of DAMGO, resulting in a transient increase in nuclear ERK activity. The identification of the MOR-interaction networks that control differential spatiotemporal signaling reported here is an important step toward understanding how signal compartmentalization contributes to opioid-induced responses, including anti-nociception and the development of tolerance and dependence.

KEYWORDS

G protein-coupled receptor (GPCR), opiate opioid, cell compartmentalization, protein complex, proteomics, extracellular signal-regulated kinase (ERK), desmosome, Ras-related C3 botulinum toxin substrate 1 (Rac1), cell signaling, opioid-based analgesics

Title

Ligand-dependent spatiotemporal signaling profiles of the μ-opioid receptor are controlled by distinct protein-interaction networks

Author

Srgjan Civciristov,‡ Cheng Huang,§¶ Bonan Liu,‡ Elsa A. Marquez,¶ Arisbel B. Gondin,‡ Ralf B. Schittenhelm,§¶ Andrew M. Ellisdon,¶ Meritxell Canals,‡,1 and Michelle L. Halls‡,2

Publish date

2019 Nov 1;

PMID

25938544

Abstract

Reprogramming energy metabolism, such as enhanced glycolysis, is an Achilles’ heel in cancer treatment. Most studies have been performed on isolated cancer cells. Here, we studied the energy-transfer mechanism in inflammatory tumor microenvironment. We found that human THP-1 monocytes took up lactate secreted from tumor cells through monocarboxylate transporter 1. In THP-1 monocytes, the oxidation product of lactate, pyruvate competed with the substrate of proline hydroxylase and inhibited its activity, resulting in the stabilization of HIF-1α under normoxia. Mechanistically, activated hypoxia-inducible factor 1-α in THP-1 monocytes promoted the transcriptions of prostaglandin-endoperoxide synthase 2 and phosphoenolpyruvate carboxykinase, which were the key enzyme of prostaglandin E2 synthesis and gluconeogenesis, respectively, and promote the growth of human colon cancer HCT116 cells. Interestingly, lactate could not accelerate the growth of colon cancer directly in vivo. Instead, the human monocytic cells affected by lactate would play critical roles to ‘feed’ the colon cancer cells. Thus, recycling of lactate for glucose regeneration was reported in cancer metabolism. The anabolic metabolism of monocytes in inflammatory tumor microenvironment may be a critical event during tumor development, allowing accelerated tumor growth.

KEYWORDS

lactate, HIF-1α, gluconeogenesis, inflammation, microenvironment

Title

Lactate promotes PGE2 synthesis and gluconeogenesis in monocytes to benefit the growth of inflammation-associated colorectal tumor

Author

Libin Wei,1 Yuxin Zhou,1 Jing Yao,1 Chen Qiao,1 Ting Ni,1 Ruichen Guo,2 Qinglong Guo,1 and Na Lu1

Publish date

2015 Jun 30


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