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2012 Promega catalogue

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Life<br />

Science<br />

Catalog<br />

<strong>2012</strong><br />

Worldwide Contact List<br />

Section<br />

Contents<br />

Table of<br />

Contents<br />

Cell Signaling<br />

144<br />

Calpain-Glo Protease Assay<br />

Product Size Cat.# Price ($)<br />

Calpain-Glo Protease Assay 10 ml G8501 490.00<br />

For Research Use Only. Not for Use in Diagnostic Procedures.<br />

50 ml G8502 1267.00<br />

Description: The Calpain-Glo Protease Assay is a homogeneous,<br />

luminescent assay that measures calpain 1 (μ) and 2 (m) activities. Calpains<br />

are a family of calcium-activated cysteine proteases involved in cleaving a wide<br />

variety of proteins. Calpains modulate the biological activities of their substrates<br />

via limited proteolysis.<br />

The Calpain-Glo Protease Assay provides a succinyl, proluminescent calpain<br />

substrate, Suc-LLVY-aminoluciferin, in a buffer system optimized for calpain<br />

and luciferase activities. The addition of the calpain reagent in an<br />

“add-mix-measure” format results in calpain cleavage of the substrate and<br />

rapid development of a “glow-type” luminescent signal produced by the<br />

luciferase reaction. The signal is proportional to the amount of calpain activity<br />

present. The assay is designed for use with purified enzyme preparations.<br />

Features:<br />

• Faster Results: The homogeneous, enzyme-coupled format is especially<br />

well suited for rapidly autolysed enzymes like calpain; maximum sensitivity<br />

is reached in as little as 10 minutes, while the enzyme is fully active.<br />

• Simple Protocol: The homogeneous “add-mix-measure” protocol makes<br />

the assay easy to automate.<br />

• Greater Sensitivity: The assay is up to 1,000 times more sensitive than<br />

competitive fluorometric assays. The luminescent assay avoids inherent<br />

fluorescent background signals, providing excellent signal-to-background<br />

readings. The assay is linear over 4 logs of calpain concentration.<br />

Storage Conditions: Store components at –20°C protected from light.<br />

Protocol Part#<br />

Calpain-Glo Protease Assay Technical Bulletin TB344<br />

Calpain I or II<br />

H<br />

Suc-LLVY – N<br />

S<br />

N<br />

Suc-LLVY + H2N S N COOH<br />

Luciferase<br />

Light<br />

N<br />

N<br />

S<br />

COOH<br />

S<br />

Aminoluciferin<br />

ATP, Mg ++ , O 2<br />

The proluminescent substrate containing the Suc-LLVY sequence<br />

recognized by calpain. Following calpain cleavage, the substrate for<br />

luciferase (aminoluciferin) is released, allowing the luciferase reaction to occur<br />

and producing light.<br />

5105MA<br />

Signal-to-Noise Ratio<br />

100,000<br />

10,000<br />

1,000<br />

100<br />

10<br />

1<br />

0<br />

0.001<br />

Suc-LLVY-aminoluciferin; 12 minutes<br />

Suc-LLVY-aminoluciferin; 30 minutes<br />

Suc-LLVY-aminoluciferin; 60 minutes<br />

FRET substrate; 30 minutes<br />

Suc-LLVY-AMC; 60 minutes<br />

0.01<br />

0.1 1 10<br />

Calpain I (nM)<br />

1,000<br />

For complete and up-to-date product information visit: www.promega.com/catalog<br />

100<br />

Sensitivity of the Calpain-Glo Protease Assay compared to<br />

fluorescent assays.<br />

5108MA

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