The Structural Variations of ε-Amino Groups in Phospholipase A2 Enzymes from Naja naja atra and Bungarus Multicinctus Venoms View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-02

AUTHORS

Long-sen Chang, Shinne-ren Lin, Chun-chang Chang

ABSTRACT

Comparative studies on Naja naja atra phospholipase A2 (NNA-PLA2), Bungarus multicinctus phospholipase A2 (BM-PLA2), and their Lys-modified derivatives were made to assess the differences in the fine structures around the conserved Lys residues of PLA2 enzymes. It was found that the accessibility of Lys residues of PLA2 enzymes toward modified reagent, trinitrobenzene sulfonate, were not the same. Moreover, the extent of decrease in pI values of PLA2 enzymes that resulted from trinitrophenylation of lysine residues was different between NNA-PLA2 and BM-PLA2. The Lys-6 of BM-PLA2 mostly contributed to the positively charged character of the enzyme molecule, whereas the contribution of Lys-6 of NNA-PLA2 to its molecular charge was not notably different from other Lys residues. A linear relationship was observed by plotting the mobilities of PLA2 enzymes and their TNP derivatives against their pI values. However, native and Lys-modified NNA-PLA2 were not aligned with those of BM-PLA2 in the same line. Apparently the gross conformation of PLA2 enzymes was not notably perturbed by the modification of Lys residues, but the fine structure of NNA-PLA2 was not the same as that of BM-PLA2. These results indicate that the positioning of side chains of the conserved Lys residues in the two PLA2 enzymes is essentially different, and suggest that the variations in the fine structures of homologous proteins could be effectively explored by chemical modification studies and electrophoretic analysis. More... »

PAGES

133-137

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1026394118064

DOI

http://dx.doi.org/10.1023/a:1026394118064

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1041429209

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/9112606


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