A Review of Heat Shock Proteins Research on Bemisia tabaci

Shunxiao Liu^1,2*, Kui Wang¹, Vlasenko Volodymyr^2#

¹Department of Plant Protection, Henan Institute of Science and Technology, Xinxiang, China.
²Department of Plant Protection, Sumy National Agrarian University, Sumy, Ukraine.

DOI: 10.4236/as.2022.133027                

Abstract

Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae) is the most destructive invasive pests in agricultural production and has a high tolerance to heat. Heat shock proteins play an essential role in life activities such as growth and development, reproduction and diapause of B. tabaci. At the same time, they are also crucial in resisting adverse environments and in adaptive evolution. The expression of heat shock protein in B. tabaci is not only related to temperature, but also to the tolerance of the environment. After receiving external stimuli, the expression level can be increased or decreased to maintain the stability of cells in vivo. This paper reviews the classification, biological characteristics, biological functions, and research status of HSPs in recent years. This mini-review will provide helpful information related to the use of heat shock proteins to study the occurrence and damage of B. tabaci. This has important theoretical and practical significance for revealing Hsps in explaining the population expansion mechanism of B. tabaci invasion and predicting population dynamics.

Keywords

Bemisia tabaci, Heat Shock Proteins, Molecular Chaperone, Heat Shock Transcriptional Factor, Stress

1. Introduction

B. tabaci was first reported in 1889 when it was found on tobacco in Greece and was named Aleyrodes tabaci [1]. B. tabaci belongs to Hemiptera, Aleyrodidae. It is a tiny, herbivorous piercing-sucking pest concentrated in tropical and subtropical regions [2] [3]. B. tabaci is a species complex containing more than 30 cryptic species [4] [5]. Among the various biotypes of B. tabaci, it spreads worldwide through trade activities such as the transportation of poinsettia or other flower seedlings [6] [7]. B. tabaci has become an essential worldwide pest due to its sizeable feeding amount, broad host range, strong viability, large egg production, rapid development, and easy to develop drug resistance, with high ecological adaptability and thermotolerance [8] [9].

Heat shock proteins (HSPs) are anti-stress proteins when organisms are under the pressure of adverse environmental conditions for a certain period [10] [11]. HSPs can be used as molecular chaperones to transfer intracellular nascent peptide chains and recognize denatured proteins, and it is an essential mechanism for organisms to cope with adverse environments [12] [13] [14] [15].

In 1962, Ritossa [16] first discovered that a brief heat shock could induce the formation of new bulges in the salivary gland chromosomes of Drosophila melanogaster larvae, which is called heat shock response (HSR). After that, many studies have proved that heat shock proteins have the function of conferring heat resistance to organisms [17] [18] [19] [20]. Until 1974, Tissiéres et al. [21] used SDS-PAGE and autoradiography to confirm that the substance predicted by Ritossa at that time was a group of particular proteins and named these proteins as HSP. Furthermore, whiteflies can utilize heat shock proteins (HSPs) (encoded by Hsp genes) and other stress-related genes to overcome thermal stress [22]. When B. tabaci is exposed to harsh environments to a sub-lethal level, heat shock proteins will increase or decrease protein expression to supplement cellular toughness. This paper reviews the different types, characteristics and gene expression of HSP in B. tabaci, in order to illustrate the progress of HSP in B. tabaci research and provide reference information for further research of B. tabaci [23].

2. Classification of Heat Shock Proteins

In recent years, with the rapid development of biological science and technology and the improvement of sequencing efficiency and accuracy, the research on HSPs has made significant progress. At present, we divide heat shock proteins into five families: Hsp90, Hsp70, Hsp60, small-molecule heat shock proteins, and ubiquitin according to their molecular weight and homology similarity [20] [24] [25] [26]. Within the HSPs, Hsp70s are the most studied group [27]. There are many reports on Hsp90 and Hsp70 of B.tabaci [28]. Salvucci et al. [22] found that Hsp70 and Hsp90 were the major polypeptides synthesized by whiteflies in response to heat stress. Wang et al. [29] observations highlighted the molecular evolutionary properties and the response mechanism to temperature assaults of Hsp genes in whitefly.

2.1. Hsp90

Hsp90 exists in various types of cytoplasm under normal or stress conditions. Its primary function is to bind to denatured proteins as a molecular chaperone and participate in the regulation and maintenance of the conformation and role of various proteins in cells so that cells can usually survive under a stress environment [30] [31] [32]. Hsp90 can also interact with signal transduction proteins, promote the binding of steroid hormone receptors and protein kinases to form complexes, and regulate kinase phosphorylation activity [31] [33] [34] [35]. The interaction between environmental stress and Hsp90 of B. tabaci and the analysis of the molecular mechanism has practical significance for further understanding the resistance mechanism of B. tabaci to achieve the control effect [30] [36]. Kinene [37] investigated the variability of the HSP90 gene in the B. tabaci species complex and found evidence of recombination in the coding region of the HSP90 gene in the B. tabaci species complex.

2.2. Hsp70

The Hsp70 family is a class of highly conserved heat shock proteins. Its main functions are: involved in protein folding and unfolding, protein translocation, and multimeric complex translocation. It has weak ATPase activity when combined with ATP [38] [39]. When B. tabaci is under high-temperature stress, a large amount of Hsp70 is synthesized in the body to protect it from or reduce high-temperature damage [40] [41]. Differences in heat shock proteins (HSPs), especially Hsp70, which plays a vital role in heat tolerance, might cause the observed differences between females and males of B. tabaci [36] [42].

2.3. Hsp60

Hsp60 usually exists in the cytoplasm and mitochondria. Hsp60 is not only involved in the folding and assembly of proteins encoded by nuclear genes after entering mitochondria, but also in the folding, assembly and transport of proteins encoded by mitochondria themselves [43]. Under stress conditions, Hsp60 binds to ATP first, causing its own conformational change, so that it can bind proteins for maintenance and repair [44]. Wang et al. [29] employed comprehensive genomics approaches to identify one Hsp60 in the Middle East Asia Minor 1 whitefly genome.

2.4. Small Heat Shock Proteins

Small heat shock proteins exist in highly ordered oligomers in organisms. Because they have different biological functions in different environments, they are usually in two states of dissociation and aggregation. Their main parts are: participating in protein folding, unfolding, and assembling multimeric complexes [25] [45] [46]. Improving diapause and cold tolerance for most insects is vital for their safe overwintering. Small heat shock proteins have an essential contribution to enhancing diapause and cold tolerance of insects [47] [48] [49]. Small heat shock proteins (sHSPs) are probably the most diverse in structure and function among the various superfamilies of stress proteins, and they play essential roles in different biological processes. Bai et al. [50] confirmed that the sHSP genes of B. tabaci had shown differential expression changes under thermal stress.

2.5. Ubiquitin

Ubiquitin is a protein found in eukaryotic cells either free or covalently joined to a variety of cytoplasmic and nuclear proteins [51]. Its physiological function is to participate in protein degradation [52]. Xia et al. [53] found that ubiquitin-proteasome system might help the whitefly to counteract the negative influence from TYLCV through degrading the virus directly or activating immune response.

3. Characteristics of Heat Shock Proteins

Heat shock proteins were initially considered unique proteins expressed by organisms in response to increased temperature. Still, studies have found that a class of heat shock genes is also significantly expressed in unstimulated cells or produced in specific cell cycle stages [48] [54]. Meanwhile, studies have shown that many heat shock proteins exist in mitochondria and chloroplasts. Therefore, heat shock protein genes are a multigene superfamily in which not all members are regulated by heat shock [55] [56] [57]. Subsequent studies have shown that organisms may induce the synthesis of such stress proteins under stressful environmental conditions such as high temperature, salinity, drought, and osmosis, which function as molecular chaperones in cells and participate in folding new peptide chains, protein assembly, and transport [58] [59].

The growth and development of insects are very complex, they go through different developmental stages, and insects in different developmental stages also have significant differences in their morphology [60]. Heat shock proteins can improve the tolerance of organisms to adverse environments and protect organisms or cells from minor damage in subsequent lethal stress [61]. Organisms can often acquire heat tolerance under higher temperature stress after treating sub-lethal high temperatures [17]. Jinn et al. [62] [63] showed that the expression of HSPs is related to heat resistance, but also the thermal stability of different kinds of HSPs can substitute for each other. Heat shock proteins (HSPs) as molecular chaperones to assist in the refolding, stabilization, intracellular transport, and degradation of proteins to prevent the accumulation of damaged proteins and maintain the stability of the intracellular environment [11] [56] [64].

4. Heat Shock Protein Gene

Studies have found that the heat tolerance of organisms is closely related to the structure and expression of their Hsp genes [37] [65] [66]. The regulation of heat shock gene expression includes selective transcription and alternative translation; the former is the main one [62]. Studies have shown that heat shock proteins are not directly involved in protecting their intracellular environment in these organisms, but bind to the heat shock element (HSE) through heat shock transcriptional factor (HSF), to form transcription complexes and promote the expression of heat shock protein genes [67] [68].

In organisms, the structure and function of HSF have less variation in evolution and have extensive homology. It is a protein that is ubiquitous in eukaryotic cells. We divided them into four types according to their different functions, including Hsf1, Hsf2, Hsf3, and Hsf4 [69]. Hsf1 is considered a major regulator of cellular heat shock protein expression. It is highly conserved in yeast, drosophila, and vertebrates, and the other three HSFs cannot replace Hsf1 [70] [71] [72] [73]. Hsf2 is resistant to heat-stimulating signals and is generally more sensitive to signals representing growth, development, and differentiation [74]. Hsf3 is a bird-specific heat-shock regulator [68] [75]. Hsf4 only exists in the human body, does not activate the transcription process, and plays an important role in cataract occurrence. Hsf4 can inhibit the expression of heat shock genes under certain conditions [76]. The molecular mechanism of heat tolerance in females of B. tabaci MEAM1 cryptic species compared with males shows that the differential expression of multiple genes regulates the heat tolerance of females [77] [78] [79].

5. Conclusion

With the continuous development of sequencing technology and the continuous reduction of sequencing costs, we will identify more heat shock protein genes of B. tabaci. Identifying these sequences will reveal the evolution of heat shock proteins in B. tabaci. The research on the function of heat shock proteins in B. tabaci must also be related to the physiology, growth, and development of B. tabaci to understand the different roles in the physiology and evolution of B. tabaci. Studying the properties and expression levels of HSP genes in B. tabaci is helpful to clarify the mechanism of B. tabaci diapause induction. In terms of biological control, we can use the expression mechanism of heat shock protein-related genes to regulate the timing of diapause in B. tabaci.

In conclusion, it is of great significance to study the heat shock protein of B. tabaci, which is helpful to understand the relationship between the growth and development of B. tabaci and various influencing factors (such as temperature, pathogen invasion, pesticides, et al.), to provide new ideas for the comprehensive control of B. tabaci, and better carry out plant protection and quarantine work.

NOTES

*First author.

^#Corresponding author.

Conflicts of Interest

The authors declare no conflicts of interest regarding the publication of this paper.

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