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A6778 Sigma-Aldrich

Angiotensin Converting Enzyme from rabbit lung

≥2.0 units/mg protein (modified Warburg-Christian)

Synonym: ACE, Peptidyl-dipeptidase A, Peptidyldipeptide Hydrolase



General description

The angiotensin-converting enzyme (ACE) is a dipeptidyl-carboxypeptidase which exists in somatic and testicular isoforms with zinc binding motif HEXXH in their active site. ACE regulates blood pressure through renin-angiotensin system. ACE elevates blood pressure by converting angiotensin I to a key vasoconstrictor angiotensin II and inhibiting a potent vasodilator bradykinin. Inhibition of ACE is a targeted therapeutic strategy for high blood pressure. Several ACE synthetic inhibitory peptides available for clinical use include captopril, enalapril and lisinopril. Currently, developing inhibitory peptides from natural food sources, or phenolic compounds from plant sources to inhibit ACE is underway. ACE plays a critical role in fertilization by releasing the proteins anchored to glycosylphosphatidylinositol (GPI) in sperm membrane.


Angiotensin converting enzyme from rabbit lung has been used:
• for measuring inhibitory effect of egg white protein hydrolysates on ACE activity by high performance liquid chromatography (HPLC)
• to measure the ACE inhibition by litchi pericarp and cooked chicken breast using hippuryl-L-histidyl-L-leucine (HHL) as substrate by reverse phase-HPLC (RP-HPLC)3 and HPLC respectively
• in releasing GPI anchored protein in vitro in few cell lines like HeLa, HEK293 and in vivo in mice sperm.

Biochem/physiol Actions

Removes C-terminal dipeptides from susceptible substrates, e.g., angiotensin I and bradykinin.


May contain traces of sodium chloride.

Unit Definition

One unit will produce 1.0 μmole of hippuric acid from Hippuryl-His-Leu per min in 50 mM HEPES and 300 mM NaCl at pH 8.3 at 37 °C.

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
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What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
Are there any other known inhibitors of rabbit lung Angiotensin Converting Enzyme (ACE), Product A6778?
Idrapril, the prototype of a new class of angiotensin converting enzyme (ACE) inhibitors, competitively inhibits, with nanomolar apparent Ki, the hydrolysis of hippuryl-glycyl-glycine by rabbit lung ACE.Kinetic Ki and kon and koff values were 470 pM, 3.0±1.5×106 M-1sec-1 and 1.4±0.3×10-3 sec-1, respectively.Reference: Biochemical Pharmacology, 45(6), 1358-1362 (1993).
What is the medical significance of Angiotensin Converting Enzyme (ACE), Product A6778?
Angiotensin-converting enzyme (ACE) produces angiotensin II, a substance that affects the cardiovascular system in numerous ways, including narrowing of blood vessels. This narrowing can cause high blood pressure and cause the heart to work harder.ACE inhibitors treat a variety of conditions, such as high blood pressure, scleroderma and migraines. (Mayo Clinic)
What is the effect of bleomycin onAngiotensin Converting Enzyme (ACE) activity in vivo?
Bleomycin causes a marked reduction in rabbit lung ACE activity. Reference: Cancer Research, 40, 3621-3626, (1980).
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Protocols & Articles


Antihypertensive Agents

Agents that inhibit angiontensin-converting enzymes (ACE) and angiotensin II formation are essential to cardiovascular medicine.1 These inhibitors are used not only to treat essential hypertension an...
Sami Barghshoon
BioFiles v7 n5, 2012, 5–20
Keywords: AGE, Antihypertensives, Cardiovascular, Clinical, Diuretics, PAGE, Reductions

Plasma Derived Proteins and Enzymes

Despite their complexity, blood and plasma are abundant biological resources for the discovery of drug targets and biomarkers for human disease. It is estimated that plasma may contain as many as 40,...
BioFiles 2006, 1.5, 2.
Keywords: Applications, Gas chromatography, Type

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