Mechanism to control the cell lysis and the cell survival strategy in stationary phase under heat stress
© Noor. 2015
Received: 15 March 2015
Accepted: 7 October 2015
Published: 13 October 2015
An array of stress signals triggering the bacterial cellular stress response is well known in Escherichia coli and other bacteria. Heat stress is usually sensed through the misfolded outer membrane porin (OMP) precursors in the periplasm, resulting in the activation of σE (encoded by rpoE), which binds to RNA polymerase to start the transcription of genes required for responding against the heat stress signal. At the elevated temperatures, σE also serves as the transcription factor for σH (the main heat shock sigma factor, encoded by rpoH), which is involved in the expression of several genes whose products deal with the cytoplasmic unfolded proteins. Besides, oxidative stress in form of the reactive oxygen species (ROS) that accumulate due to heat stress, has been found to give rise to viable but non-culturable (VBNC) cells at the early stationary phase, which is in turn lysed by the σE-dependent process. Such lysis of the defective cells may generate nutrients for the remaining population to survive with the capacity of formation of colony forming units (CFUs). σH is also known to regulate the transcription of the major heat shock proteins (HSPs) required for heat shock response (HSR) resulting in cellular survival. Present review concentrated on the cellular survival against heat stress employing the harmonized impact of σE and σH regulons and the HSPs as well as their inter connectivity towards the maintenance of cellular survival.
An assortment of physicochemical stress stimuli triggering the cellular defense related stress responsive mechanisms have been identified so far in bacteria, largely in Escherichia coli, and to certain extent in other microorganisms (Franchini et al. 2015; Munna et al. 2015; Nur et al. 2014; Nagamitsu et al. 2013; Murata et al. 2012; Valdez-Cruz et al. 2011; Rudolph et al. 2010; Caspeta et al. 2009; Noor et al. 2009a, b; Kim et al. 2007; Guisbert et al. 2007; Raivio and Silhavy 2000; Nitta et al. 2000; Hengge-Aronis 2000). The principal stress signals include nutrient exhaustion, elevated temperature, alteration in pH and the redox state, variations in salt concentrations, increased amount of internal reactive oxygen species (ROS), external oxidants like hydrogen peroxide (H2O2), other toxic chemicals, etc. (Munna et al. 2015; Nur et al. 2014). Such stress signals in E. coli are usually sensed by the increase in the outer membrane porin (OMP) precursors in the periplasm, which are further transduced into the cytoplasm resulting in the activation of the genes necessary for the cellular homeostatic recovery (Shenhar et al. 2009; Hayden and Ades 2008; Kim et al. 2007).
In bacteria, many stress responses are generated by the alternative sigma factors that can rapidly reprogram the necessary gene expression against various stress signals by recruiting RNA polymerase to specific subsets of stress responsive promoters in the cell (Campagne et al. 2015; Paget 2015; Murata et al. 2012; Kim et al. 2007; Gruber and Gross 2003). So far seven sigma factors have been identified that differently recognize about 2000 promoters on the E. coli genome to express around 4300 genes (Jin et al. 2013; Ishihama 1999). These factors include σD (σ70, the “housekeeping” sigma factor, encoded by rpoD), σN (σ54, the nitrogen-limitation sigma factor, encoded by rpoN), σS (σ38, the stationary phase sigma factor, encoded by rpoS), σH (σ32, the heat shock sigma factor, encoded by rpoH), σF (σ28, the flagellar sigma factor, encoded by rpoF), σE (σ24, the extracytoplasmic sigma factor, encoded by rpoE), and σFecI (σ19, the ferric citrate sigma factor, encoded by fecI). Interestingly, an extensive functional overlap has been noticed between the σ factors: the majority of σH promoter targets overlap with those of σD, and σE regulated promoters also overlaps extensively with those for σD (Wade et al. 2006). In E. coli the stress caused by elevated temperatures has long been known to be regulated by two alternative sigma factors, σH (encoded by rpoH) and σE, governing the transcription of two respective heat-shock regulons to cope with protein misfolding in the cytoplasm and the extra-cytoplasm (periplasm and outer membrane), respectively (Dartigalongue and Raina 1998; Raina et al. 1995).
Indeed, a number of reports very clearly unravelled the cellular defence strategies triggered by heat stress. Present review simply compiled the information regarding the heat shock response in E. coli and attempted to decipher the cell survival strategies employing the sigma factors and the chaperon proteins at high temperature. The interesting part of the present review would be the aspects of correlation of the ROS concentrations with the formation of viable nut nonculturable (VBNC) cells triggering the induction of their lysis together with a possible cellular survival output.
Cell survival employing heat-shock proteins (HSPs) in concert with sigma factors
The transcription of the rpoH gene for σH is induced at elevated temperature via the action of σE (Erickson and Gross 1989). σE is in part regulated by a cognate small RNA (as discussed later), and σH synthesis is regulated by structural change of its own mRNA molecules serving as a cellular thermometer and its activity modulated by phosphorylation (Klein et al. 2003). In E. coli, around 400 genes have been reported to be up-regulated by the transient heat shock by up-shifting the incubation temperature from 37 to 43 °C (Gunasekera et al. 2008). Indeed, to deal with high temperature stress in E. coli, GroEL and DnaK protein amounts are largely elevated (Morimoto 2012; Morimoto et al. 2011; Guisbert et al. 2008; Kedzierska 2005). σH is principally known to regulate the transcription of the major heat shock proteins (HSPs) and molecular chaperons required for heat shock response (HSR) resulting in cellular survival. Transcription of the rpoH gene for σH is induced at elevated temperature via the action of σE (Lim et al. 2013; Murata et al. 2011). The control of the expression of HSPs has been found to be highly variable among different bacteria (Gonzalez et al. 2013; Urban-Chmiel et al. 2013; Stephanou and Latchman 2011; Raina et al. 1995). Most of the HSPs including GroEL and DnaK, ATP-dependent proteases of Lon, HslUV, Clp and FtsH (HflB), periplasmic protease DegP, etc. are already known to be involved in protein folding, refolding, quality control and degradation, removal of damaged proteins, and are induced in response to stress (Ryabova et al. 2013; Murata et al. 2011; Gunasekera et al. 2008; Mcbroom and Kuehn 2007; Kabir et al. 2005; Ades 2004; Arsene et al. 2000; Missiakas et al. 1997).
Protein folding is known to be mediated principally by the ribosome-associated trigger factor (TF), the Hsp70 system DnaK/DnaJ/GrpE and the chaperonin system GroES/GroEL (Kumar and Sourjik 2012). While DnaK/DnaJ/GrpE is the most adaptable chaperone system in E. coli, and GroEL and its cofactor GroES are known to be essential for cell viability (Hartl et al. 2011), another highly conserved chaperone system Hsp90 (HtpG in E. coli) is still known to be not that functional (Kumar and Sourjik 2012). Hsp100 (ClpB in E. coli) and some other small HSPs are primarily involved in refolding of the unfolded or aggregated proteins (Goeser et al. 2015; Kumar and Sourjik 2012). Interestingly, most chaperone systems are co-localized to the heat-induced protein aggregates in E. coli (Winkler et al. 2010). Besides, periplasmic protease DegP, the CpxAR (Cpx) mechanism, involvement of BaeRS (Bae), and the events of Rcs phosphorelays, the phage shock (PSP) response, and the responses generated by ppGpp in response to heat shock become functional (Alexopoulos et al. 2013; Barchinger and Ades 2013; Kumar and Sourjik 2012; Morimoto 2012; Suzuki et al. 2012; Majdalani and Gottesman 2005; Raivio 2005; Rowley et al. 2006; Ruiz and Silhavy 2005; Artsimovitch et al. 2004; Porankiewicz et al. 1999).
The controlling modulators of σH are the DnaK chaperone system together with the metallo-protease FtsH (HflB) (Arsene et al. 2000; Straus et al. 1987; Bukau 1993). Afterward the up-regulation of genes encoding the HSPs during the increase of temperature has been intensely investigated (Morimoto 2012; Valdez-Cruz et al. 2011; Akerfelt et al. 2010; Klein et al. 2003; Guisbert et al. 2004, 2008; Yura et al. 2007; Genevaux et al. 2007; Georgopoulos 2006; Wade et al. 2006; Weber et al. 2005; Gruber and Gross 2003). In order to combat against the permanently changing environmental conditions including heat shock, E. coli has been recently reported to employ ClpXP, ClpAP, HslUV, Lon and FtsH, for the regulated proteolysis which is required to adjust the cellular protein pool (Bittner et al. 2015). Moreover, in response to heat shock, ATP-driven proteolysis by the Clp protease (Clp/Hsp100 chaperone family) has been reported to play a vital role in the removal of non-functional damaged proteins which is indeed in favor of cell homeostasis (Alexopoulos et al. 2013; Porankiewicz et al. 1999; Gottesman 1996).
σS, which is encoded by the rpoS gene, functions as the master regulator of the general stress response, and can be activated within the range of temperature <37–41 °C (King et al. 2014). σD is usually activated during the maximal cellular growth especially at 37–41 °C. During the log phase, cells remain viable with the potential of colony formation. When the reactive oxygen species (ROS) accumulates and transforms the culturable cells into viable but nonculturable (VBNC) form, cells undergo stasis of which a major fraction undergoes σE-dependent lysis (Noor et al. 2009b). Upon heat shock (>42 °C), most cells become non-culturable, and the rpoE-encoded alternative sigma factor σE and the rpoH-encoded classical heat‐shock sigma factor σH act as the regulator of the extra-cytoplasmic HSPs (Chakraborty et al. 2014; Morimoto 2012; Murata et al. 2011).
σE-dependent programmed cell death (PCD) as the cell survival strategy
The physiological changes in cellular behaviour and the association of sigma factors in the stress responsive events have been elaborately noticed earlier (Murata et al. 2012; Noor et al. 2009a; Erickson and Gross 1989; Raina et al. 1995). Indeed at the early stationary phase, E. coli cells have been noticed to undergo a decrease in the number of viable cells, and as the stationary phase progresses, interestingly cells keep sustaining their colony-forming abilities (Zambrano et al. 1993). However, at the entry of the stationary phase, in parallel with the decline in colony forming units (CFUs), cells that are viable but defective in the formation of CFUs; i.e., viable but nonculturable (VBNC) cells (Cuny et al. 2005; Desnues et al. 2003; Nystrom 2003; Nitta et al. 2000), tend to accumulate at the early stationary phase, and undergo lysis with a concomitant increase in the amounts of σE (Nitta et al. 2000; Kabir and Yamada 2005). Interestingly, such lysis has been noticed to remove the damaged cells (supported by the reduction in cell turbidity at an optical density of 600 nm or at OD600) but have no or minor impact on the cellular potential of formation of colonies (Noor et al. 2009a, b; Kabir et al. 2004, 2005; Nitta et al. 2000). Thus, in consistent to the earlier hypothesis (i.e., VBNC cells typically demonstrate decreased metabolic activity while on resuscitation they become culturable), the VBNC cells may be considered to define a specific program of differentiation into a long-term survival state (Oliver 2005; Bogosian and Bourneuf 2001; Villarino et al. 2000). In this context, the specific lysis of VBNC cells may be considered as the programmed cell death (PCD), with the elucidation of the mechanism of σE-directed PCD (Noor et al. 2009a; Nitta et al. 2000). This mechanism might be physiologically important for E. coli because it can eliminate specifically the VBNC cell population.
Functional analysis of rseA, rseB, rseC genes in cell survival
Role of sodA and katE genes and the trigger of σE-dependent cell lysis
Heat shock and evolution of oxidative stress (through ROS generation)
The influence of the temperature up-shift on the generation of intracellular oxidative stress has been detected earlier (Noor et al. 2013; Yamada et al. 2009), and the impulsive accretion of the ROS at the early stationary phase of bacterial growth has been monitored (Yamada et al. 2009). As stated above, our earlier study (Noor et al. 2009b) has shown that mutation in sodA and katE genes induced the elevated accumulation ROS, resulting in the formation of VBNC cells state, which ultimately underwent the σE-directed cell lysis (Fig. 5a). Consistently when these genes were overexpressed, the ROS accumulation was noticed to be suppressed in association to the repression of the σE level (Noor et al. 2009b). The role of ROS as the trigger of such lysis involving the σE regulon small RNAs and the subsequent defect in OMP biogenesis proteins will be discussed later (Fig. 5b).
Role of PPiD, small RNAs and OMP in σE-dependent cell lysis
While a number of ATP-dependent chaperones exist in the cytoplasm, the periplasm harbors two defined types of folding catalysts: protein disulfide isomerase (PDI) and peptidyl–prolyl cis–trans isomerase (PPIase) (Dartigalongue and Raina 1998). PPIases (PpiA, PPiD and FkpA and SurA of the parvulin family in the periplasm, and PPiC of the parvulin family in the cytoplasm) are known to catalyse the rapid interconversion between the cis and trans forms of the peptide bond Xaa–Pro (Dartigalongue and Raina 1998). PPiD is known to be the first member of a periplasmic folding catalyst which is regulated by the classical heat-shock sigma factor σH whereas SurA has a general chaperone-like function involved in correcting the misfolded OMP monomers whose accumulation induce the σE-dependent response in the extra-cytoplasm (Lazar and Kolter 1996; Rouviere and Gross 1996).
As stated earlier, a reduction in the amounts of PpiD in the strain possessing the σE-depenent cell lysis was observed (Noor et al. 2009a). Consistently, suppression of such lysis was observed upon increased expression of the ppiD gene (encoding PpiD), with the OMP folding function. Moreover, the increased expression of the rpoE gene (encoding σE) has been shown to reduce the reduction in the levels of OMPs (Murata et al. 2012). Indeed, PpiD is known to recognize the early OMP folding intermediates, and hence its over-expression suppresses OMP biogenesis defects. As stated above, the levels of PpiD were found to be severely reduced in the rseA mutants (with an increased frequency of σE-depenent cell lysis) (Noor et al. 2009a). Such a reduction in the levels of PpiD could partly account for OMP reduction and hence cell lysis in ΔrseA mutants. Therefore, the cell lysis phenotype was evidently deciphered due to reduction in the amounts of major OMPs, and conversely, the PpiD over-expression could be the cause of suppression of this lysis phenotype due to acceleration of OMP folding (Fig. 5b). The findings thus revealed an innate mechanism of cell lysis associated with the integrity of the outer membrane (OM), which is apparently impaired in the rseA mutants (Murata et al. 2012).
A second aspect of the σE response may involve the small Hfq-binding RNAs (two σE-dependent small noncoding RNAs (sRNAs), MicA and RybB or Hfq chaperon) which play a major role in maintaining envelope homeostasis, rapid removal of multiple omp transcripts in response to elevated activity of the alternative sigma factor (Peng et al. 2014; Johansen et al. 2008; Vogel and Papenfort 2006). Indeed an ingenious investigation conducted by our group (Murata et al. 2012) on the consequence of sRNA (MicA and RybB, as the respective genes were under the control of σE regulon as well as the small RNAs being regulators of outer membrane protein, omp genes) on the σE-dependent lysis process. Among the omp gene products, OmpA is known to be involved in the protection of cell shape and nutrient passage through the outer membrane, OmpC serves as the principal cation-selective porin, while OmpW is assumptive of conferring the cellular integrity (Murata et al. 2012). The micA- and rybB-disrupted mutations were found to completely repress the cell lysis. Interestingly the increased expression of micA and rybB genes or the disrupted mutants of ompA, ompC and ompW was noticed to enhance the cell lysis. Experimental demonstration by other studies also showed that the transient induction of RybB resulted in the reduced amounts of mRNA transcripts encoding OmpC and OmpW (Johansen et al. 2006). Mutation in the rybB gene resulted in the abolition of the σE-mediated regulation of ompC and ompW (Johansen et al. 2006). Thus the sRNA-OMP network is of physiologically importance whereby some sRNAs act specifically on a single omp mRNA, whereas others control the multiple omp mRNA targets (Vogel and Papenfort 2006).
The possible mechanism of σE-dependent lysis with the involvement of sRNA with subsequent on Omp proteins has been modelled in Fig. 5b. The model shows that the activation of σE stimulates the expression of micA and rybB genes (encoding the respective small RNAs) with a concomitant reduction in Omp proteins, which in turn causes the disintegration of the outer membrane finally resulting in cell lysis. This is to be mentioned that the expressional control of omp genes (encoding OmpC, OmpA and OmpW of outer membrane proteins) is achieved by small RNAs of micA and rybB, of which genes are strictly under the control of σE (Valentin-Hansen et al. 2007). Interestingly MicA and RybB were found to be directly involved in cell lysis under ordinary growth conditions in the wild type strains of E. coli; i.e., when σE is not expressed (Murata et al. 2012). One of the possible signals for conversion of colony-formable cells to VBNC cells was identified as the accumulation of intracellular reactive oxygen species (ROS) around the beginning of stationary phase generating oxidative stress (Noor et al. 2009b). Mutations in both rpoS and katE was found to induce σE-dependent cell lysis (Noor et al. 2009b; Kabir et al. 2004). Moreover, the mutation of sodA (encoding superoxide dismutase) was found to significantly increase the expression of the rpoE gene encoding σE (Noor et al. 2009b). Thus the involvement of ROS (either normally or due to the mutation of katE and sodA genes) has been shown in this model. Noor et al. 2009a showed that the PpiD (the OMP biogenesis factor) amounts were uniquely reduced when σE levels were elevated. Such reduction in the levels of PpiD thus seems to reflect the cell lysis phenotype. Hence the PpiD has been included in Fig. 5b.
The present review comprehended the role of sigma factors, the heat shock proteins (HSPs), and the possible interaction between them in combating the cellular stress in E. coli evoked by the heat shock. The cellular events in the early stationary phase have been clearly discussed during the heat stress in terms of the elevation impact of the reactive oxygen species (ROS). Accumulation of lysis protein in course of cell incubation has been correlated with the stress resistance mechanisms. Roles of outer membrane porin (OMP), small RNAs, PPiD have clearly been demonstrated to disrupt the cell membrane integrity upon the σE-directed lysis of the viable but non-culturable (VBNC) cells accumulated due to the increased ROS level due to heat stress.
Authors thank the scientist groups whose published papers have been cited in this literature review.
The author declares that he has no competing interests. This review has not been submitted for publication nor has been published in whole or in a part in elsewhere.
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