Salicylic acid-induced components of oligomeric protein complexes

Abstract

Over the last few years the increasing amount of information on plant cell signaling reveals the role of oligomeric protein complexes in perception, transduction, and amplification of signaling impulses. These protein complexes participate also in gene expression, transcript processing, as well as in synthesis, refolding, and degradation of proteins. However, there are scarce data regarding the influence of phytohormones on the production of these protein complex components. The effect of salicylic acid (SA) on these complexes is investigated in more detail. This review summarizes our own and published data concerning the induction by SA of the receptor proteins, some transcriptional factors, the GTP binding nuclear protein, the nuclear anti gen of proliferating cells, two kinds of RNA bindings proteins, β CE B translation elongation factor I, molecular chaperons Hsp70, chaperonin 60, 14 3 3 proteins, polyubiquitin, E1 subunit of 20S proteasome, and subunit 11 of 26S proteasome.

Molecular–genetic aspects of plant immunity to phytopathogenic bacteria and fungi

“…Current information on SA induced proteins is reviewed by Tarchevsky et al [92,93]. It is assumed that SA accumulates in large quantities in the infected region and binds with low affinity to the receptor NPR3 (NONEXPRESSOR OF PR GENES 3), thereby trig gering degradation of cell death suppressor NPR1 [94] and initiating HR.…”

Compartmentation of Salicylate-induced proteins

“…They include SA induced proteins glutaredoxin and thiore doxin [23], which are important for SA signaling; adaptor protein 14 3 3; ubiquitin like proteins; chap erons; etc. [24].…”

“…They are one of the most com plicated heterooligomeric protein complexes, and their importance was recently reported [24]. The structural features of nuclear pores, their protein com position, and the mechanism of the transport of pro teins and their complexes through the pores are described in a number of reviews and experimental articles [9, 20, 37-44, etc.…”

“…Some proteins with damaged structure are capable of refolding with the use of chaperones (a part of which is induced by SA [24]), while others are degraded in the cytoplasm or in lytic vacuoles during the ubiquitin proteasome or autophagy processes, respectively. The latter is typical, for example, for proteins that are oxi dized because of a strong and rapid increase in the content of reactive oxygen species (the oxidative burst), which is observed when plants are infected by pathogens or subjected to an attack of exogenous SA [74].…”