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Zablotna, Ewa; Kret, Agnieszka; Jaskiewicz, Anna; Olma, Aleksandra; Leplawy, Miroslaw T.; Rolka, Krzysztof
Biochemical and biophysical research communications, 02/2006, Letnik: 340, Številka: 3Journal Article
In many complexes formed by serine proteinases and their inhibitors, the hydroxyl group provided by water molecule or by the inhibitor Ser residue is located close to the inhibitor P{sub 1}-P{sub 1}{sup '} reactive site. In order to investigate the role of this group, we synthesized analogues of trypsin inhibitor SFTI-1 isolated from the seeds of sunflower modified in P{sub 1} by {alpha}-hydroxymethylserine (HmSer) and both enantiomers of {alpha}-hydroxymethylvaline (HmVal). All the synthesized analogues inhibited bovine {beta}-trypsin and human leukocyte elastase. SFTI-1 analogues with HmVal and HmSer appear to be potent inhibitors of bovine {beta}-trypsin, whereas Val{sup 5}SFTI-1 is practically inactive. Also trypsin inhibitory activity of Ser{sup 5}SFTI-1 is significantly lower. Since the electrostatic interaction between protonated {epsilon}-NH{sub 2} group of the inhibitor P{sub 1} position and {beta}-carboxylate of trypsin Asp{sup 189} is the main driving force for interaction of both molecules, the results obtained are very interesting. We believe that these SFTI-1 analogues belong to a novel class of serine proteinase inhibitors.
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