Protector RNase Inhibitor

Contents
Protector RNase Inhibitor (40 U/μl) in storage buffer: 20 mM HEPES-KOH, 50 mM KCl, 8 mM dithiothreitol, 50% glycerol (v/v), pH approximately 7.6 (+4°C).

Protector RNase Inhibitor inactivates a wide spectrum of RNases, including

• RNase A
• RNase B
• RNase T2

Thus, Protector RNase Inhibitor can help prevent RNase degradation in any application where RNases could cause problems. For instance, it can:

• protect mRNA during cDNA synthesis reactions, RT-PCR (in conventional thermal cyclers and qPCR systems), or in vitro transcription/translation reactions
• protect viral RNA during in vitro virus replication
• inhibit RNases during RNA isolation and purification
• be used in RNase protection assays
• help prepare RNase-free antibodies

Note: Protector RNase Inhibitor does not interfere with enzymes commonly used to prepare or analyze RNA.

Protector RNase Inhibitor definetely does not inhibit RNase T1 and RNase 1.
Protector RNase Inhibitor (20 U/ 20 μl reaction) inhibits RNase A up to 1 ng, RNase B up to 160 pg and RNase T2 up to 0.03 U/μl reaction volume.
RNase H is not inhibited by Protector RNase Inhibitor.
Heat inactivation: > 65 °C

Protector RNase Inhibitor may be used to:

• Protect mRNA in cDNA synthesis reactions, RT-PCR (in conventional thermal cyclers and qPCR systems), e.g., with the LightCycler^® Instruments, in vitro transcription/translation system, RNase Protection Assay, in vitro RNA synthesis
• Protect viral RNA during in vitro virus replication
• Inhibit RNases during RNA isolation and purification
• Help prepare RNase-free antibodies
• Synthesize RNA probes for in situ hybridization

It is useful in any application where RNases could be a potential problem.

Each lot of Protector RNase Inhibitor is function tested with the Titan One Tube RT-PCR Kit and the LightCycler DPD Kit. Protector RNase Inhibitor is also tested for contaminating activities as described below.
Test buffer: 50 mM Tris-HCl, 10 mM MgCl₂, 0.1 mM EDTA, 7 mM β-Mercaptoethanol; pH 7.5 (+37°C).
Absence of endonucleases: 1 μg EcoR I/Hind III*-fragments of λDNA is incubated with Protector RNase Inhibitor in 50 μl test buffer at +37°C for 1 hour. The amount of inhibitor that causes no alteration in the banding pattern is stated under "Endo".
Absence of nicking activity: 1 μg supercoiled pBR322 DNA is incubated with Protector RNase Inhibitor in 50 μl test buffer at +37°C for 1 hour. The amount of inhibitor that causes no relaxation of supercoiled DNA is stated under "Nick. Act.".
Absence of ribonuclease (1): 5 μg of MS2 RNA is incubated with Protector RNase Inhibitor for 1 hour at +37°C in a final volume of 50 μl. The amount of inhibitor that causes no degradation of MS2 RNA is stated under "RNase 1".
Absence of ribonuclease (2): 5 μg of MS2 RNA is incubated with Protector RNase Inhibitor for 1 hour at +37°C, then 10 minutes at +65°C in a final volume of 50 μl. The amount of inhibitor that causes no degradation of MS2 RNA is stated under "RNase 2".

One unit of Protector RNase Inhibitor is defined as the amount of protein required to inhibit 50% of the activity of 5 ng RNase A.

Unit Assay: Activity is measured according to Blackburn as ability to inhibit hydrolysis of cyclic cytidine-2′ : 3′-monophosphoric acid. Under assay conditions, 200 U of Protector RNase Inhibitor inhibits 50% of the activity of 1 μg RNase A.

Volume Activity: 40 U/μl

Working concentration:

• 5 to 10 U in One-step RT-PCR
• 25 to 50 U in Two step RT-PCR
• 20 U for in vitro transcription

You may use higher concentrations of Protector RNase Inhibitor in RT-PCR if you suspect that RNase contamination causes certain samples to be difficult to amplify. The inhibitor does not interfere with the reaction. (In a test system, even a 16-fold higher concentration
of inhibitor did not interfere with RT-PCR.)

Product Specifications:
Source: Rat lung; Product is produced recombinant in E. coli
Isoelectric Point: pH 4.5
Temperature where Protector RNase Inhibitor is active: 25°C to +55°C; partial activity is still measurable at +60°C
Inactivation: Under severe denaturizing conditions (temperatures above +65°C), the inhibitor is inactivated
Bioburden: <50 cfu/ml
DNA Content: <100 pg/mg

For life science research only. Not for use in diagnostic procedures.

NOTICE TO PURCHASER: DISCLAIMER OF LICENSE
This product is optimized for use in the polymerase chain reaction (PCR) covered by patents owned by F. Hoffmann-La Roche Ltd ("Roche"). No license under these patents to use the PCR Process is conveyed expressly or by implication to the purchaser by the purchase of this product. A license to use the PCR Process for certain research and development activities accompanies the purchase of certain Roche, Applied Biosystems or other licensed suppliers′ reagents when used in conjunction with an authorized thermal cycler, or is available from Applied Biosystems. Diagnostic purposes require a license from Roche. Further information on purchasing licenses may be obtained by contacting the Director of Licensing at Applied Biosystems, 850 Lincoln Centre Drive, Foster City, California 94404, USA.

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