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蛋白晶体研究工具和试剂
℡ 4000-520-616
℡ 4000-520-616
Hampton research/Low Ionic Strength Screen (LISS)/Low Ionic Strength Screen /1 ml, tube format/HR2-120
产品编号:HR2-120
市  场 价:¥3540.00
场      地:美国(厂家直采)
产品分类: 其它>耗材>其他>
联系QQ:1570468124
电话号码:4000-520-616
邮      箱: info@ebiomall.com
美  元  价:$177.00
品      牌: Hampton research
公      司:HAMPTON RESEARCH CORP.
公司分类:
Hampton research/Low Ionic Strength Screen (LISS)/Low Ionic Strength Screen /1 ml, tube format/HR2-120
商品介绍
Applications

Features

Description

The Low Ionic Strength Screen is effective in determining the preliminary crystallization conditions of intact monoclonal antibodies.1 However, this screen is not just an intact antibody screen. The screen has effectively determined the preliminary crystallization conditions for numerous monoclonal antibody fragments as well as other soluble proteins.

The screen should be utilized as a low ionic strength crystallization screen for proteins where this strategy could be effective in determining preliminary crystallization screens.

In this screen, the concentration of a high purity, monodisperse PEG 3,350 is varied from 4 to 24% w/v (4, 8, 12, 16, 20 and 24% w/v) versus a pH range of 2 to 12 (2, 3, 3.5, 4, 4.5, 5, 5.5, 6.0, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 11, 12). Stock buffer concentrations are 50 mM. Final buffer concentration in the drop is typically 10 mM.

Unique features of this screen: (1) Low ionic strength. Buffer concentration is supplied as 50 mM, resulting in an initial drop concentration of 10 mM (Drop = 4 µl sample, 2 µl buffer, 5 µl precipitant). (2) The Polyethylene glycol (PEG) 3,350 is a special, high-purity, monodisperse preparation with an Mr of 3,300-3,400. Most PEGs of this molecular weight have an Mr of plus or minus 500 rather than 50. (3) An extremely broad range of pH 2 to 12 is sampled. At low ionic strength, the effects of pH and temperature upon sample solubility are amplified. Hence this screen allows one to critically evaluate the effects of temperature and pH upon sample solubility and crystallization. It is recommended the screen be repeated at several temperatures between 4°C and 37°C to take advantage of the low ionic strength feature.

The format of this screen is different than other screens offered by Hampton Research. The screen is supplied as a set of eighteen 50 mM buffers, six PEG 3,350 concentrations, and a single dehydrant, PEG 3,350. This formulation allows one to screen up to 108 conditions if desired. The formulation is designed to offer options. Coarse sample of pH and/or precipitant concentration can be performed with 24 or even 12 drops. This will eliminate large regions of sampling space and conserve sample. Subsequent screens and perhaps even optimization can encompass an increasingly finer grid matrix of pH, precipitant concentration as well as other variables significant for sample crystallization. The protocol requires the following pipetting steps for a typical vapor diffusion experiment: (1) Pipet dehydrant to reservoir. (2) Pipet drop. (3) Pipet buffer to drop. (4) Pipet precipitant to drop.

Each kit contains 24 unique reagents of varying pH and PEG 3,350 concentration. Buffers of 50 mM are supplied for pH 2, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 11, and 12 in 1 ml volumes. The precipitant Polyethylene glycol 3350 is supplied as 4, 8, 12, 16, 20, and 24% w/v in 1 ml volumes. Dehydrant is available separately as 200 ml of 24% w/v PEG 3,350 (catalog number HR2-519). Combining each pH and precipitant supplied can generate 108 crystallization screening conditions. All solutions are formulated using ultra-pure water and are sterile filtered.

Note: Crystallization kit (HR2-120) and Dehydrant/reservoir solution (HR2-519) are sold separately. Both items are needed to perform the screen.

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品牌介绍

美国Hampton Research公司是蛋白质晶体研究方面的专家,是一个从事蛋白质晶体研究研制的专业公司,为全球科研人员提供晶体研究工具和试剂,完整的晶体培养体系;同时提供晶体设计和合成方面的服务。其提供的试剂长期以来在该领域居于领先地位,为广大研究人员提供了极大的方便,促进了蛋白质晶体的研究,为世界范围内的蛋白质晶体研究人员所信赖。

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