半岛bd体育手机客户端 说明

一般描述

Purified Lysozyme DNA free SAE0152 undergoes strict quality control testing to ensure the absence of detectable levels of contaminating DNA using 35 cycles PCR amplification of 16S and 18S rDNA using universal primer sets.
Lysozyme is a single chain polypeptide of 129 amino acids cross-linked with four disulfide bridges.1 It hydrolyzes b(1à 4) linkages between N-acetylmuraminic acid and N-acetyl-D-glucosamine residues in peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrin.2,3,4 The enzyme is often used for lysing bacterial cells by hydrolyzing the peptidoglycan present in the cell walls. Gram-positive cells are quite susceptible to this hydrolysis as their cell walls have a high proportion of peptidoglycan. Gram-negative bacteria are less susceptible due to the presence of an outer membrane and a lower proportion of peptidoglycan.
The enzyme is active over a broad pH range (6.0-9.0).
Lysozyme activity: ≥40,000 units/mg protein.
For isolation of nucleic acids, lysozyme has been used in the lysis peptidoglycan layer of bacterial cell walls.
The study of microbial communities has been revolutionized in recent years by the widespread adoption of culture independent analytical techniques such as 16S rRNA gene sequencing and metagenomics. Since DNA contamination during sample preparation is a major problem of these sequence-based approaches, DNA extraction reagents free of DNA contaminates are essential. This purified lysozyme preparation (SAE0152) is purified from chicken egg white, crystallized three times, dialyzed, and supplied as a lyophilized powder. Protein content by UV absorbance is ≥ 90% with the remainder (～10%) being buffer salts such as sodium acetate and sodium chloride, and undergoes strict quality control testing to ensure the absence of detectable levels of contaminating DNA using 35 cycles PCR amplification of 16S and 18S rDNA using universal primer sets.

应用

• Lysozyme is used for the extraction of genomic DNA from bacterial cells.
• Lysozyme is used as an external standard for MALDI-TOF (matrix assisted laser desorption ionization-time of flight) mass analysis.
• Lysonzyme is used to prepare spheroplasts.

酶分解细菌的细胞壁；用于制备原生质球。

生化/生理作用

溶菌酶水解肽聚糖中N-乙酰胞壁酸和N-乙酰基- D -葡糖胺残基间的 β(1→4) 键以及壳糊精中N-乙酰基- D -葡糖胺残基间的 β(1→4)键。革兰氏阳性细胞对该水解作用非常敏感，因为它们的细胞壁含有较高比例的肽聚糖。由于存在外膜以及比例较低的肽聚糖，革兰氏阴性细菌对该水解作用不太敏感。然而，细菌外膜中如果存在与金属离子螯合的 EDTA，那么这些细胞也可能被水解。

该酶在较宽的 pH 范围(6.0 到 9.0)内具有活性。与 pH 为 9.2 时相比，pH 为 6.2 时可在更广的离子强度(0.02 到 0.100M)范围内观察到最大活性。

特点和优势

Purified Lysozyme free SAE0152 undergoes strict quality control testing to ensure it will be Free of DNA contaminants, suitable for Microbiome research.

The study of microbial communities has been revolutionized in recent years by the widespread adoption of culture independent analytical techniques such as 16S rRNA gene sequencing and metagenomics. Since DNA contamination during sample preparation is a major problem of these sequence-based approaches, DNA extraction reagents free of DNA contaminates are essential.

单位定义

One unit will produce a change in A450 of 0.001 per minute at pH 6.24 at 25 ℃, using a suspension of Micrococcus lysodeikticus as substrate, in a 2.6 ml reaction mixture (1 cm light path).

基本信息

酶学委员会(EC)编号	3.2.1.17 ( BRENDA | IUBMB )
MDL编号	MFCD00131557

半岛bd体育手机客户端 性质

质量水平	100
分子量	single-chain 14.3 kDa
特点	DNA free
运输	wet ice
储存温度	?20℃

安全信息

象形图
警示用语：	Danger
危险声明	H334
预防措施声明	P261 - P284 - P501
危险分类	Resp. Sens. 1
储存分类代码	11 - Combustible Solids
WGK	WGK 3
闪点(F)	Not applicable
闪点(C)	Not applicable