Chitosan is one of the most common biopolymers in nature, and it is obtained by alkaline deacetylation
On the April 11, (https://science.sciencemag.org/content/early/2019/04/10/science.aax4558) Science released a notice declaring that it is retracting the report after a series of investigations conducted by the University of Cambridge on the paper entitled "Human SIRT6 promotes DNA end resection through CtIP deacetylation
Chitosan is a biodegradable polymer composed predominantly of repeat units of glucosamine or acetylglucosamine, depending on the degree of deacetylation
, which can range from 50% to 98% [4, 5].
Additionally, Chidamide is a new molecular entity with global patent protection developed by Chipscreen Biosciences, China's first international-recognised subtype selective histone deacetylation
enzyme (HDAC) oral inhibitor and a national class 1.1 drug.
For example, histone deacetylation
and miRNAs dysregulation are observed in the hyper-proliferation of pulmonary artery smooth muscle cells (PASMCs) (7).
Melatonin is converted to 5-methoxytryptamine by deacetylation
. 5-methoxytryptamine then forms 5-methoxyin-dolacetic acid and 5-MTX through deamination (Figure 2) (4).
The first step of reaction was deacetylation
of the acetylated lysine side chain of Hdac colorimetric substrate by a sample containing Hdac activity.
As you may know, chitosan is a polysaccharide produced by the alkaline deacetylation
of chitin, a widely available biopolymer found in the exoskeleton of crustaceans such as crab and shrimp.
They also found that a decrease in NAD+-dependent Sirt2 activity and defective Sirt2dependent deacetylation
of GKRP were responsible, at least in part, for the HGU abnormality observed in obese diabetic mice.
In the present study, chitosan hydrogel, an amino polysaccharide copolymer of 1, 4-D- glucosamines and N-acetyl glucosamines derived from chitin by alkaline or enzymatic deacetylation
, was characterized.
It is worth mentioning that SIRT4 has no obvious deacetylation
activity and the deacetylation
activity of SIRT6 is stronger than its deacetylase activity .