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921-60-8

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921-60-8 Usage

Description

L-(?)-Glucose is an enantiomer of the more common D-glucose. L-Glucose is not bioavailable to cells as an energy source because it cannot be phosphorylated by hexokinase. However, certain L-glucose-utilizing bacteria that contain NAD+-dependent L-glucose dehydrogenases capable of oxidizing L-glucose have been identified.

Chemical Properties

white powder

Uses

Different sources of media describe the Uses of 921-60-8 differently. You can refer to the following data:
1. L-Glucose is the enantiomer of D-Glucose (G595000), a naturally occurring carbohydrate used in an abundance of cellular processes. L-Glucose is a synthetic sugar used in the formation of L-Glucose Pen taacetate (G596510), a potential therapeutic agent regarding type II diabetes. In addition, L-glucose can be used as a colon cleansing agent for before a colonoscopy procedure.
2. L-(-)-Glucose is an enantiomer of the more common D-glucose a naturally occurring carbohydrate used in an abundance of cellular processes. L-Glucose is a synthetic sugar used in the formation of L-Glucose Pen taacetate, a potential therapeutic agent regarding type II diabetes. In addition, L-glucose can be used as a colon cleansing agent for before a colonoscopy procedure.
3. L-(-)-Glucose has been used in phospho-buffered saline (PBS) solution to induce metabolic responses in Saccharomyces cerevisiae. It has also been used to study the substrate competition pattern of IICB glucose transporter.

Definition

ChEBI: The L-enantiomer of aldehydo-glucose.

General Description

L-(?)-Glucose is an enantiomer of the more common D-glucose. L-Glucose cannot be used by cells as an energy source because it cannot be phosphorylated by hexokinase.

Check Digit Verification of cas no

The CAS Registry Mumber 921-60-8 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,2 and 1 respectively; the second part has 2 digits, 6 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 921-60:
(5*9)+(4*2)+(3*1)+(2*6)+(1*0)=68
68 % 10 = 8
So 921-60-8 is a valid CAS Registry Number.
InChI:InChI=1/C6H12O6/c7-1-2-3(8)4(9)5(10)6(11)12-2/h2-11H,1H2/t2-,3-,4+,5-,6-/m0/s1

921-60-8SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 16, 2017

Revision Date: Aug 16, 2017

1.Identification

1.1 GHS Product identifier

Product name aldehydo-L-glucose

1.2 Other means of identification

Product number -
Other names D-(+)-ALTROSE

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:921-60-8 SDS

921-60-8Synthetic route

2,3:4,5-di-O-isopropylidene-D-gulose

2,3:4,5-di-O-isopropylidene-D-gulose

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With DOWEX(α)50WX8-200 In water at 20℃; for 48h;100%
2-Chloro-9-((3aR,4R,6R,6aR)-2,2,3a,6-tetramethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl)-9H-purin-6-ylamine

2-Chloro-9-((3aR,4R,6R,6aR)-2,2,3a,6-tetramethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl)-9H-purin-6-ylamine

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With mercaptoethyl alcohol; Tris*HCl buffer; manganese(ll) chloride; fucose isomerase at 25℃; for 72h;28.9%
6'-O-(3''-O-methylgalloyl)arbutin

6'-O-(3''-O-methylgalloyl)arbutin

A

D-glucose
50-99-7

D-glucose

B

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With hydrogenchloride In water at 90℃; for 1h;A 26%
B n/a
L-arabinose
5328-37-0

L-arabinose

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With pyridine; hydrogen cyanide Beim Behandeln des Reaktionsprodukts mit wss.Salzsaeure unter gleichzeitigem Hydrieren an Palladium/Bariumsulfat;
Multi-step reaction with 2 steps
1: sodium methylate
2: aqueous NaOH-solution / beim anschliessend mit wss.Schwefelsaeure
View Scheme
1-Desoxy-1-nitro-L-gluco-hexitol
69257-51-8

1-Desoxy-1-nitro-L-gluco-hexitol

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With sodium hydroxide beim anschliessend mit wss.Schwefelsaeure;
(2S,3R,4S,5S)-6-Benzhydryloxy-2,3,4,5-tetrahydroxy-hexanal

(2S,3R,4S,5S)-6-Benzhydryloxy-2,3,4,5-tetrahydroxy-hexanal

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal In methanol Yield given;
L-gluconic acid-lactone

L-gluconic acid-lactone

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With sodium amalgam; sulfuric acid
With sodium amalgam; sodium hydrogen oxalate
L-gluconic acid
157663-13-3

L-gluconic acid

sodium amalgam

sodium amalgam

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
das Lacton reagiert;
L-glucono-1,5-lactone
52153-09-0

L-glucono-1,5-lactone

γ lactone of/the/ l-gluconic acid
74464-44-1

γ lactone of/the/ l-gluconic acid

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
Stage #1: L-glucono-1,5-lactone; γ lactone of/the/ l-gluconic acid With sodium tetrahydroborate In water at -5 - 5℃; for 0.333333h;
Stage #2: With acetic acid In water
2-hydroxybenzoyl-β-L-glucopyranosyl (2->1)-β-L-glucopyranosyl (2->1)-β-L-glucopyranosyl (2->1) β-Lglucopyranoside
1351356-85-8

2-hydroxybenzoyl-β-L-glucopyranosyl (2->1)-β-L-glucopyranosyl (2->1)-β-L-glucopyranosyl (2->1) β-Lglucopyranoside

A

L-glucose
921-60-8

L-glucose

B

salicylic acid
69-72-7

salicylic acid

Conditions
ConditionsYield
Acidic conditions;
2-(hydroxymethyl)-4-oxo-4Hpyran-3-yl 3-O-β-D-glucopyranosyl-β-D-glucopyranoside

2-(hydroxymethyl)-4-oxo-4Hpyran-3-yl 3-O-β-D-glucopyranosyl-β-D-glucopyranoside

A

D-glucose
50-99-7

D-glucose

B

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With trifluoroacetic acid In pyridine at 120℃; for 1h; Inert atmosphere;
2-methyl-4-oxo-4H-pyran-3-yl 3-O-β-D-glucopyranosyl-β-D-glucopyranoside

2-methyl-4-oxo-4H-pyran-3-yl 3-O-β-D-glucopyranosyl-β-D-glucopyranoside

A

D-glucose
50-99-7

D-glucose

B

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With trifluoroacetic acid In pyridine at 120℃; for 1h; Inert atmosphere;
2-(hydroxymethyl)-4-oxo-4H-pyran-3-yl 6-O-β-D-glucopyranosyl-β-D-glucopyranoside

2-(hydroxymethyl)-4-oxo-4H-pyran-3-yl 6-O-β-D-glucopyranosyl-β-D-glucopyranoside

A

D-glucose
50-99-7

D-glucose

B

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With trifluoroacetic acid In pyridine at 120℃; for 1h; Inert atmosphere;
2-methyl-4-oxo-4H-pyran-3-yl 6-O-β-D-glucopyranosyl-β-D-glucopyranoside

2-methyl-4-oxo-4H-pyran-3-yl 6-O-β-D-glucopyranosyl-β-D-glucopyranoside

A

D-glucose
50-99-7

D-glucose

B

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With trifluoroacetic acid In pyridine at 120℃; for 1h; Inert atmosphere;
2,3:4,5-di-O-isopropylidene-L-glucitol

2,3:4,5-di-O-isopropylidene-L-glucitol

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With Dowex In water for 24h;14.8 g
sodium α-d-glucoheptonatehydrate
13007-85-7

sodium α-d-glucoheptonatehydrate

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1: hydrogenchloride / water; methanol / 1 h / Reflux
2: sulfuric acid / water; methanol / 4.25 h / 20 °C
3: lithium aluminium tetrahydride / tetrahydrofuran / 0.5 h / -40 °C / Reflux
4: SiO2-supported NaIO4 / dichloromethane / 0.5 h
5: Dowex® / water / 24 h
View Scheme
methyl 2,3:4,5:6,7-tri-O-isopropylidene-D-glycero-D-gulo-heptonate
1595285-44-1

methyl 2,3:4,5:6,7-tri-O-isopropylidene-D-glycero-D-gulo-heptonate

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1: sulfuric acid / water; methanol / 4.25 h / 20 °C
2: lithium aluminium tetrahydride / tetrahydrofuran / 0.5 h / -40 °C / Reflux
3: SiO2-supported NaIO4 / dichloromethane / 0.5 h
4: Dowex® / water / 24 h
View Scheme
methyl 2,3:4,5-di-O-isopropylidene-D-glycero-D-gulo-heptonate
1595285-46-3

methyl 2,3:4,5-di-O-isopropylidene-D-glycero-D-gulo-heptonate

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: lithium aluminium tetrahydride / tetrahydrofuran / 0.5 h / -40 °C / Reflux
2: SiO2-supported NaIO4 / dichloromethane / 0.5 h
3: Dowex® / water / 24 h
View Scheme
3-O-β-D-glucopyranosyl-hederagenin 23-O-α-D-ribofuranoside
1500092-25-0

3-O-β-D-glucopyranosyl-hederagenin 23-O-α-D-ribofuranoside

A

D-ribose
50-69-1

D-ribose

B

L-ribose
24259-59-4

L-ribose

C

D-glucose
50-99-7

D-glucose

D

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With trifluoroacetic acid In water at 120℃; for 4h;
isovitexin-6''-O-α-L-glucopyranoside

isovitexin-6''-O-α-L-glucopyranoside

A

D-glucose
50-99-7

D-glucose

B

L-glucose
921-60-8

L-glucose

C

5,7-dihydroxy-2-(4-hydroxyphenyl)-4H-1-benzopyran-4-one
520-36-5

5,7-dihydroxy-2-(4-hydroxyphenyl)-4H-1-benzopyran-4-one

Conditions
ConditionsYield
With hydrogenchloride; water at 90℃; for 3h;
cellobiose

cellobiose

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With water
(1R,5R,6R,7R,8S,11S)-11,13-dihydrodehydrocostuslactone-8-O-6’-2’’(E)-butenoyl-β-D-glucopyranoside

(1R,5R,6R,7R,8S,11S)-11,13-dihydrodehydrocostuslactone-8-O-6’-2’’(E)-butenoyl-β-D-glucopyranoside

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
Stage #1: (1R,5R,6R,7R,8S,11S)-11,13-dihydrodehydrocostuslactone-8-O-6’-2’’(E)-butenoyl-β-D-glucopyranoside With hydrogenchloride In methanol; water for 4h; Reflux;
Stage #2: With pyridine; L-cysteine methyl ester hydrochloride In methanol; water at 60℃; for 2h;
Stage #3: With 2-tolyl isothiocyanate In methanol; water at 60℃; for 1h;
3,3',5'-trimethoxylmyricetin 7-O-β-D–glucopyranoside

3,3',5'-trimethoxylmyricetin 7-O-β-D–glucopyranoside

A

D-glucose
50-99-7

D-glucose

B

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With hydrogenchloride In water at 105℃; for 4h;
3-(4-hydroxy-3-methoxyphenyl)propyl-1-O-[β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside]

3-(4-hydroxy-3-methoxyphenyl)propyl-1-O-[β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside]

B

D-glucose
50-99-7

D-glucose

C

L-glucose
921-60-8

L-glucose

Conditions
ConditionsYield
With water Acidic conditions;
L-glucose
921-60-8

L-glucose

L-gluconic acid
157663-13-3

L-gluconic acid

Conditions
ConditionsYield
With 1 wt% Au/TiO2; oxygen In water at 77 - 89℃; under 39547.2 Torr; Flow reactor;94%
With CuO*CeO2 at 180℃; for 4h; Time; Reagent/catalyst; Inert atmosphere;
L-glucose
921-60-8

L-glucose

2-{5-[5-C-(1,4-anhydro-β-D-erythrotetrofuranosyl)-2-methylfuran-3-yl]-1,3,4-oxadiazol-2-ylthio}acetohydrazide
1338470-77-1

2-{5-[5-C-(1,4-anhydro-β-D-erythrotetrofuranosyl)-2-methylfuran-3-yl]-1,3,4-oxadiazol-2-ylthio}acetohydrazide

D-glucose 2-{5-[5-(1,4-anhydro-β-D-erythrotetrofuranosyl)-2-methylfuran-3-yl]-1,3,4-oxadiazol-2-ylthio}acetohydrazone

D-glucose 2-{5-[5-(1,4-anhydro-β-D-erythrotetrofuranosyl)-2-methylfuran-3-yl]-1,3,4-oxadiazol-2-ylthio}acetohydrazone

Conditions
ConditionsYield
With acetic acid In ethanol; water Reflux;78%
L-glucose
921-60-8

L-glucose

A

L-gluconic acid
157663-13-3

L-gluconic acid

B

ketogulonic acid
5627-26-9

ketogulonic acid

Conditions
ConditionsYield
With oxygen; 1% Au 1% Pt /TiO2 In water at 62℃; under 39547.2 Torr; Temperature; Flow reactor;A 63%
B 15%
L-glucose
921-60-8

L-glucose

A

L-gluconic acid
157663-13-3

L-gluconic acid

B

5-ketogluconic acid
488-34-6

5-ketogluconic acid

C

ketogulonic acid
5627-26-9

ketogulonic acid

Conditions
ConditionsYield
With oxygen; 1% Au 1% Pt /TiO2 In water at 80℃; under 39547.2 Torr; Temperature; Flow reactor;A 14%
B 10%
C 56%
L-glucose
921-60-8

L-glucose

N-<4,6-bis(dimethylamino)-1,3,5-triazin-2-yl>trimethylammonium chloride
33949-42-7

N-<4,6-bis(dimethylamino)-1,3,5-triazin-2-yl>trimethylammonium chloride

2-O-<4,6-bis(dimethylamino)-1,3,5-triazin-2-yl>-β-L-glucopyranoside

2-O-<4,6-bis(dimethylamino)-1,3,5-triazin-2-yl>-β-L-glucopyranoside

Conditions
ConditionsYield
With potassium hydroxide In water 1.) 0 deg C, 2 h, 2.) 25 deg C, 12 h;27%
pyridine
110-86-1

pyridine

L-glucose
921-60-8

L-glucose

acetic anhydride
108-24-7

acetic anhydride

α/β‐L‐glucopyranosyl‐1,2,3,4,5‐pentaacetate
147648-81-5

α/β‐L‐glucopyranosyl‐1,2,3,4,5‐pentaacetate

Conditions
ConditionsYield
at 0℃;
Acetyl bromide
506-96-7

Acetyl bromide

L-glucose
921-60-8

L-glucose

2,3,4,6-tetra-O-acetyl-α-L-glucopyranosyl bromide
67337-79-5

2,3,4,6-tetra-O-acetyl-α-L-glucopyranosyl bromide

Conditions
ConditionsYield
With acetic acid
L-glucose
921-60-8

L-glucose

phenylhydrazine acetate
72358-76-0

phenylhydrazine acetate

lyxo-[2]Hexosulose-bis-phenylhydrazon
23275-67-4

lyxo-[2]Hexosulose-bis-phenylhydrazon

Conditions
ConditionsYield
With water phenyl-l-fructosazone;
L-glucose
921-60-8

L-glucose

O4,O6-((S)-ethylidene)-L-glucose
112246-57-8

O4,O6-((S)-ethylidene)-L-glucose

Conditions
ConditionsYield
With sulfuric acid; paracetaldehyde
Conditions
ConditionsYield
With sulfuric acid; copper(II) sulfate; acetone
L-glucose
921-60-8

L-glucose

sodium acetate
127-09-3

sodium acetate

acetic anhydride
108-24-7

acetic anhydride

α/β‐L‐glucopyranosyl‐1,2,3,4,5‐pentaacetate
66966-07-2

α/β‐L‐glucopyranosyl‐1,2,3,4,5‐pentaacetate

L-glucose
921-60-8

L-glucose

1,1-Diphenylhydrazine
530-50-7

1,1-Diphenylhydrazine

glucose-diphenylhydrazone
5149-20-2, 5149-24-6, 5149-25-7

glucose-diphenylhydrazone

Conditions
ConditionsYield
With ethanol at 100℃; im geschlossenen Rohr; -diphenylhydrazone;
L-glucose
921-60-8

L-glucose

Amino-acetic acid (3S,5R,8R,9S,10S,13R,14S,17R)-14-hydroxy-10,13-dimethyl-17-(5-oxo-2,5-dihydro-furan-3-yl)-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester
42716-79-0

Amino-acetic acid (3S,5R,8R,9S,10S,13R,14S,17R)-14-hydroxy-10,13-dimethyl-17-(5-oxo-2,5-dihydro-furan-3-yl)-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester

[(2R,3S,4S,5S)-2,3,4,5,6-Pentahydroxy-hex-(E)-ylideneamino]-acetic acid (3S,5R,8R,9S,10S,13R,14S,17R)-14-hydroxy-10,13-dimethyl-17-(5-oxo-2,5-dihydro-furan-3-yl)-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester

[(2R,3S,4S,5S)-2,3,4,5,6-Pentahydroxy-hex-(E)-ylideneamino]-acetic acid (3S,5R,8R,9S,10S,13R,14S,17R)-14-hydroxy-10,13-dimethyl-17-(5-oxo-2,5-dihydro-furan-3-yl)-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester

Conditions
ConditionsYield
With ammonium chloride In ethanol for 4h; Heating;
L-glucose
921-60-8

L-glucose

L-(-)-α-methylbenzylamine
2627-86-3

L-(-)-α-methylbenzylamine

acetic anhydride
108-24-7

acetic anhydride

Acetic acid (1S,2S,3S)-2,3,4-triacetoxy-1-{(R)-1-acetoxy-2-[acetyl-(1-phenyl-ethyl)-amino]-ethyl}-butyl ester
79526-50-4, 79549-65-8, 79549-66-9, 79549-67-0, 79549-68-1, 79617-01-9, 83680-90-4, 83680-91-5

Acetic acid (1S,2S,3S)-2,3,4-triacetoxy-1-{(R)-1-acetoxy-2-[acetyl-(1-phenyl-ethyl)-amino]-ethyl}-butyl ester

Conditions
ConditionsYield
With pyridine; sodium cyanoborohydride 1.) methanol-water 2.) 100 deg C, 1 h; Multistep reaction;
L-glucose
921-60-8

L-glucose

(-)-α-methylbenzylamine
2627-86-3

(-)-α-methylbenzylamine

acetic anhydride
108-24-7

acetic anhydride

Acetic acid (1S,2S,3S)-2,3,4-triacetoxy-1-{(R)-1-acetoxy-2-[acetyl-((S)-1-phenyl-ethyl)-amino]-ethyl}-butyl ester
79526-50-4, 79549-65-8, 79549-66-9, 79549-67-0, 79549-68-1, 79617-01-9, 83680-90-4, 83680-91-5

Acetic acid (1S,2S,3S)-2,3,4-triacetoxy-1-{(R)-1-acetoxy-2-[acetyl-((S)-1-phenyl-ethyl)-amino]-ethyl}-butyl ester

Conditions
ConditionsYield
With pyridine; sodium cyanoborohydride 1.)Methanol, water, room temp. 2.)100 deg C, 1 hour; Multistep reaction;
L-glucose
921-60-8

L-glucose

p-toluidine
106-49-0

p-toluidine

N-(p-tolyl)-amine-1-D-fructose
61819-68-9

N-(p-tolyl)-amine-1-D-fructose

Conditions
ConditionsYield
With acetic acid In water for 0.5h; Heating;
L-glucose
921-60-8

L-glucose

2,2'-bipyridine-4,4'-diboronic acid
159614-36-5

2,2'-bipyridine-4,4'-diboronic acid

C10H10B2N2O4*C6H12O6

C10H10B2N2O4*C6H12O6

Conditions
ConditionsYield
complex formation;
L-glucose
921-60-8

L-glucose

Sucrose
57-50-1

Sucrose

A

leucrose (5-O-α-D-glucopyranosyl-β-D-fructopyranose)
470-16-6, 58166-26-0, 100430-38-4, 130853-03-1, 7158-70-5

leucrose (5-O-α-D-glucopyranosyl-β-D-fructopyranose)

B

α-D-glucopyranosyl-(1->6)-α-D-glucopyranosyl-(1->4)-L-glucose

α-D-glucopyranosyl-(1->6)-α-D-glucopyranosyl-(1->4)-L-glucose

Conditions
ConditionsYield
With alternansucrase from Leuconostoc mesenteroides NRRL B-21297 Enzymatic reaction;
L-glucose
921-60-8

L-glucose

dimethyl amine
124-40-3

dimethyl amine

C8H17NO5

C8H17NO5

Conditions
ConditionsYield
With acetic acid In ethanol at 20 - 75℃; for 3h; Amadori rearrangement;

921-60-8Relevant articles and documents

A new sesquiterpenoid glycoside from Saussurea involucrata

Qi, Shizhou,Yang, Yiren,Xian, Xiaoyan,Li, Xianzhe,Gao, Huiyuan

, p. 943 - 949 (2020)

Saussurea involucrata, known for the abundant bioactive components, is a precious traditional Chinese medicine. In this study, a novel guaiane sesquiterpenoid glycoside named (1R, 5R, 6R, 7R, 8S, 11S)-11, 13-dihydrodehydrocostuslactone-8-O-6'-2''(E)-butenoyl-β-D-glucopyranoside (1), together with seven known compounds (2–8) were isolated from the dried aerial part of S. involucrata. Their structures were elucidated by spectroscopic and physico-chemical analyses. The antioxidant and anti-inflammatory activities of compound 1 were investigated. And compound 1 showed weak radical scavenging activity and low inhibitory activity on nitric oxide (NO) production.

Three new compounds from the twigs and leaves of Nageia fleuryi Hickel

Chen, Lu-Zhou,Liu, Yu-Nan,Lou, Hong-Xiang,Ren, Dong-Mei,Shen, Tao,Wang, Xiao-Ning,Xiang, Lan,Xu, Jia-Xin,Yang, Hu

supporting information, (2022/03/31)

Two new diterpenoids, 12,15-di-O-acetylhypargenin B (1) and taiwanin F-12-O-β-D-glucopyranoside (2), one new monoterpenoid, (S)-7-methyl-3-methyleneoct-6-ene-1,2-diyl diacetate (3), together with eight known compounds (4?11), were obtained from the twigs

Orthogonal Active-Site Labels for Mixed-Linkage endo-β-Glucanases

Jain, Namrata,Tamura, Kazune,Déjean, Guillaume,Van Petegem, Filip,Brumer, Harry

, p. 1968 - 1984 (2021/05/26)

Small molecule irreversible inhibitors are valuable tools for determining catalytically important active-site residues and revealing key details of the specificity, structure, and function of glycoside hydrolases (GHs). β-glucans that contain backbone β(1,3) linkages are widespread in nature, e.g., mixed-linkage β(1,3)/β(1,4)-glucans in the cell walls of higher plants and β(1,3)glucans in yeasts and algae. Commensurate with this ubiquity, a large diversity of mixed-linkage endoglucanases (MLGases, EC 3.2.1.73) and endo-β(1,3)-glucanases (laminarinases, EC 3.2.1.39 and EC 3.2.1.6) have evolved to specifically hydrolyze these polysaccharides, respectively, in environmental niches including the human gut. To facilitate biochemical and structural analysis of these GHs, with a focus on MLGases, we present here the facile chemo-enzymatic synthesis of a library of active-site-directed enzyme inhibitors based on mixed-linkage oligosaccharide scaffolds and N-bromoacetylglycosylamine or 2-fluoro-2-deoxyglycoside warheads. The effectiveness and irreversibility of these inhibitors were tested with exemplar MLGases and an endo-β(1,3)-glucanase. Notably, determination of inhibitor-bound crystal structures of a human-gut microbial MLGase from Glycoside Hydrolase Family 16 revealed.

Phenolic glycosides and flavonoids with antioxidant and anticancer activities from Desmodium caudatum

Xu, Qian-Nan,Zhu, Dan,Wang, Guang-Hui,Lin, Ting,Sun, Cui-Ling,Ding, Rong,Tian, Wen-Jing,Chen, Hai-Feng

, p. 4534 - 4541 (2020/03/23)

Descaudatine A (1), an undescribed phenolic glycoside, along with a known analogue (2) and ten flavonoids (3-12), were isolated from the whole plant of Desmodium caudatum. Compounds 1 and 4 exhibited potent antioxidant activities with the IC50 of 58.59 μM and 31.31 μM, respectively, which were approached to that of the positive control Vitamin C (IC50 = 46.32 μM). Meanwhile, 12 showed moderate antioxidant activity with the IC50 of 173.9 μM. Besides, compounds 3 and 6 inhibited the proliferation of HeLa cells with IC50 values of 56.14 μM and 69.04 μM, respectively. Further studies indicated that 3 and 6 could dose-dependently induce PARP cleavage and might trigger caspase-3, 8, 9 activation to induce apoptosis. RXRα is an ideal anticancer target of nuclear receptor. The reporter gene assay of RXRα indicated that 3 and 6 could inhibited the 9-cis-RA induced RXRα transcription in a concentration-dependent manner.

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