Abstract
The peptide P7, with an amino acid sequence of Cys-Val-Thr-Pro-Ala-Leu-Arg, inhibits angiotensin I-converting enzyme (ACE). In this paper, P7 was identified in peanut protein isolate (PPI) and peanut polypeptides (PPs) with a new method. The P7 peptide was synthesized and used in the preparation of an antiserum. Using the antiserum, P7 was specifically identified in PPI by western blot, and its level in PPI and PPs was assayed by dot blot hybridization. The results showed that two bands of P7 expression with molecular weight 18–25 and 25–35 kDa were seen in PPI by glucan gel chromatography. The positive reaction rate of P7 in PPs was higher than in PPI, consistent with the measured ACE inhibitory activity. The rate of P7 in sample no. 3 reached 39.29% of the positive control, using a dose of 20 μg/mL. This sample had an ACE inhibitory activity of 89.73%. Therefore, western blot and dot blot hybridization with prepared antibody against synthetic peptide was a very sensitive detection method for peptide.
Similar content being viewed by others
Abbreviations
- PPI:
-
Peanut protein isolate
- PPs:
-
Peanut polypeptides
- ACE:
-
Angiotensin I-converting enzyme
- P7:
-
Synthetic peptide with an amino acid sequence of Cys-Val-Thr-Pro-Ala-Leu-Arg
References
Erdos EG (1975) Angiotensin I-converting enzyme. Circ Res 36:247–255
Maruyama S, Nakgomi K, Tomizuka N, Suzuki H (1985) Angiotensin I-converting enzyme inhibitor derived from an enzymatic hydrolysate of casein. Agric Biol Chem 49:1405–1409
Hazato T, Kse R (1986) Isolation of angiotensin-I converting enzyme inhibitor from porcine plasma. Biochem Biophys Res Commun 139:52–55
Okamoto A, Hanagat H, Kawamura Y, Yanagida F (1995) Anti-hypertensive substances in fermented soybean, Natto. Plant Food Hum Nutr 47:39–47
Matsumura N, Fugii M, Takeda Y, Sugita K, Shimizu T (1993) Angiotensin I converting enzyme inhibitor peptides derived from dried bonito bowels autolysate. Biosci Biotechnol Biochem 57:695–697
Fujita H, Yokohama K, Yoshikawa M (2000) Classification and antihypertensive activity of angiotensin I-converting enzyme inhibitor peptides derived from food proteins. J Food Sci 65(4):564–569
Matsui T, Matsufuji H, Seki E, Osajima K, Nakshima M, Osajima Y (1993) Inhibition of angiotensin-I converting enzyme by Bacillus licheniformis alkaline protease hydrolysates derived from sardine muscle. Biosci Biotechnol Biochem 57:922–925
Liu ZQ, Zeng YL, Jin H (2003) Optimizing the technological parameters in aqueous enzymatic synchronous extraction of peanut protein and peanut oil. J Peanut Sci 32:1–7
Lucas EW (1979) Food uses of peanut protein. J Am Soc 56:425–430
Adler-Nissen J (1986) Enzymic hydrolysis of food proteins. Elsevier, London
Li GH, Le GW, Shi YH et al (2004) Angiotension I-converting enzyme inhibitory peptides derived from food proteins and their physiological and pharmacological effects. Adv Nutr Res 27:469–486
Liu H, Li GH, Shi YH, Le GW (2005) Angiotension I-converting enzyme inhibitory activity of peanut protein hydrolysates prepared with Alcalase. J Peanut Sci 34:8–14
Chen GT, Zhao LY, Cong T, Zhao L, Bao SF (2007) Preparation of peanut polypeptide and its antioxidative effects in d-galactose induced oxidative injury mice. Food Sci 28:324–327
Hwang J-Y, Shue Y-S, Chang H-M (2001) Antioxidative activity of roasted and defatted peanut kernels. Food Res Int 34:639–647
Liu LN, Lv J, He DP, Zhang SH (2007) Antioxidation activity of peanut peptides in vitro. J Chin Cereals Oils Assoc 23(3):169–172
Chen Q et al (2007) Effect of lactic acid fermented soybean meal on the growth performance, intestinal microflora and morphology of weaned piglets. J Anim Feed Sci 16(1):75–85
Marquez MC, Femandez V (2002) pH-stat method to evaluate the heat inactivation subtilisin inhibitor in legumes. Chem Biochem Eng Q 1:71–76
Cushman DW, Cheung HS (1971) Spectrophotometric assay and properties of the angiotensin-converting enzyme of rabbit lung. Biochem Pharmacol 20:1637–1648
Wu QY, Ma HL, LuoL, SY Wu (2005) Determination of angiotensin converting enzyme inhibitor activity by high performance liquid chromatography. J Chromatogr 1:79–81
Lowry OH, Roserbrough NJ, Farr AL, Randall RJ (1951) Protein measurement with Folin phenol reagent. J Biol Chem 193:265–275
Shan GM, Wengatz I, Stoutamire DW et al (1999) An enzyme-linked immunosorbent assay for the detection of esfenvalerate metabolites in human urine. Chem Res Toxicol 12(11):1033–1041
Laemmli UK (1970) Cleavage of structural pectins during the assembly of the head of the bacteriophage T4. Nature 227:680–685
Zhang W (2007) Study on preparation and antihypertensive effects of angiotensin converting enzyme inhibitory peptides from peanut protein. Master Degree Thesis, College of Food Science and Technology, Huazhong Agricultural University
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Liu, Ln., Zhang, Sh. & He, Dp. Detection of an angiotensin converting enzyme inhibitory peptide from peanut protein isolate and peanut polypeptides by western blot and dot blot hybridization. Eur Food Res Technol 230, 89–94 (2009). https://doi.org/10.1007/s00217-009-1136-7
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00217-009-1136-7