Molecular cloning and characterization of a maize transglutaminase complementary DNA

Gene
E VillalobosJosé M Torné

Abstract

Two related complementary DNA clones, TGZ15 and TGZ21, encoding active maize transglutaminase (TGase) have been isolated for the first time in plants by molecular cloning (Patent Pending PCT/ES03/00247). Southern and northern blot analyses indicate that the two cDNAs probably corresponded to two different single-copy genes in the maize genome. Northern blot analyses revealed that the transcript is expressed preferentially in young leaves and differentiated embryogenic maize callus. This expression is dependent on light exposure time. TGase activity of the proteins encoded by clones TGZ15 and TGZ21 was detected in bacterial extracts overexpressing them, using two enzymatic assays. TGase activity was significantly higher than that of the empty-phagemid bacterial extracts. As in other TGases, this activity was inhibited by monodansyl cadaverine (MDC), GTP and the absence of exogenous Ca(2+). Likewise, light-stimulated Ca(2+)-dependent TGase activity was detected in thylakoids and grana of maize chloroplast, which was inhibited by MDC, GTP, DIECA and Diuron.

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Citations

Jul 16, 2008·Amino Acids·Donatella Serafini-FracassiniStefano Del Duca
Aug 2, 2011·Amino Acids·Daniela CaccamoRiccardo Ientile
May 5, 2007·Biotechnology Letters·Patricia K Carvajal-VallejosMireya Santos
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