Date Published: April 3, 2019
Publisher: Public Library of Science
Author(s): Andrey A. Buglak, Anatoly V. Zherdev, Hong-Tao Lei, Boris B. Dzantiev, Yoshihiro Uesawa.
A common task in the immunodetection of structurally close compounds is to analyze the selectivity of immune recognition; it is required to understand the regularities of immune recognition and to elucidate the basic structural elements which provide it. Triazines are compounds of particular interest for such research due to their high variability and the necessity of their monitoring to provide safety for agricultural products and foodstuffs. We evaluated the binding of 20 triazines with polyclonal (pAb) and monoclonal (mAb) antibodies obtained using atrazine as the immunogenic hapten. A total of over 3000 descriptors were used in the quantitative structure-activity relationship (QSAR) analysis of binding activities (pIC50). A comparison of the two enzyme immunoassay systems showed that the system with pAb is much easier to describe using 2D QSAR methodology, while the system with mAb can be described using the 3D QSAR CoMFA. Thus, for the 3D QSAR model of the polyclonal antibodies, the main statistical parameter q2 (‘leave-many-out’) is equal to 0.498, and for monoclonal antibodies, q2 is equal to 0.566. Obviously, in the case of pAb, we deal with several targets, while in the case of mAb the target is one, and therefore it is easier to describe it using specific fields of molecular interactions distributed in space.
Triazines are herbicides which are widely used in agriculture and may accumulate in soil, as well as in food products . Triazines are bound in soil to solids as well as to dissolved fractions of humic and fulvic acids, which leads not only to the accumulation of triazines in soil but also to the contamination of surface and ground waters  since triazines are water soluble.
It seems reasonable to compare the most similar compounds with each other and find out which descriptors play a key role in their recognition.
In this study, we evaluated the efficiency of the interaction of 20 triazines with polyclonal and monoclonal antibodies grown using atrazine as the immunizing hapten.