In Vitro Enzymatic Stabilities of Methionine-enkephalin Analogues Containing an Adamantane-type Amino Acid

Roščić, Maja; Sabljić, Vanja; Mlinarić-Majerski, Kata; Horvat, Štefica (2008) In Vitro Enzymatic Stabilities of Methionine-enkephalin Analogues Containing an Adamantane-type Amino Acid. Croatica Chemica Acta, 81 (4). pp. 637-640. ISSN 0011-1643

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Abstract

The enzymatic stability of synthetic methionine-enkephalin peptide analogues containing an unnatural amino acid of the adamantane-type 3-5 was examined in human serum, at 37 degrees C, and compared with the results of the degradation of the parent endogenous pentapeptide 1 and the tripeptide, Tyr-Gly-Gly (2). Methionme-enkephalin (Tyr-Gly-Gly-Phe-Met, 1) and tripeptide 2 are rapidly degraded in 80 % human serum with half-lives of 12.2 and 23.0 Minutes. respectively, preferably by aminopeptidase cleavage of the N-terminal Tyr-Gly peptide bond. Incorporation of the rigid and sterically hindered 1-adamantylglycine moiety into the peptide sequence resulted in increased stability of compound 3, while compounds 4a and 5a were not at all susceptible to the enzymes present in human serum. Strong binding of peptides 3-5 to human serum proteins was demonstrated.

Item Type:	Article
Uncontrolled Keywords:	adamantane; enzymatic stability; human serum; methionine-enkephalin; peptide; unnatural amino acid; opioid growth-factor
Subjects:	NATURAL SCIENCES > Chemistry
Divisions:	Division of Organic Chemistry and Biochemistry
Projects:	Project title Project leader Project code Project type Kemijske preobrazbe prirodnih spojeva [16092] Lidija Varga-Defterdarović 098-0982933-2936 MZOS Kavezasti spojevi: ugradbene jedinice u molekularnim sustavima [27342] Kata Majerski 098-0982933-2911 MZOS
Depositing User:	Štefica Horvat
Date Deposited:	22 Oct 2013 12:49
URI:	http://fulir.irb.hr/id/eprint/824

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