Antioxidant, antibacterial, and ultraviolet-protective properties of carotenoids isolated from Micrococcus spp.

Mohana, Devihalli Chikkaiah; Thippeswamy, S.; Abhishek, Rayasandra Umesh

doi:10.4103/0972-0464.142394

Cited by 55 publications

(45 citation statements)

References 24 publications

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“…This could be explained by the increased capability of Micrococcus luteus to withstand reactive oxygen levels in hosts other than tomato. Mohana, Thippeswamy and Abishek [ 72 ] showed that carotenoids produced by Micrococcus luteus protect the bacterium from oxidation. Ohwada et al [ 73 ] showed that Micrococcus luteus has 91 times more catalase activity and 20 times more peroxidase activity than Pseudomonas .…”

Section: Balance Between Microbe-oxidation Susceptibility and Resimentioning

confidence: 99%

Rhizophagy Cycle: An Oxidative Process in Plants for Nutrient Extraction from Symbiotic Microbes

et al. 2018

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In this paper, we describe a mechanism for the transfer of nutrients from symbiotic microbes (bacteria and fungi) to host plant roots that we term the ‘rhizophagy cycle.’ In the rhizophagy cycle, microbes alternate between a root intracellular endophytic phase and a free-living soil phase. Microbes acquire soil nutrients in the free-living soil phase; nutrients are extracted through exposure to host-produced reactive oxygen in the intracellular endophytic phase. We conducted experiments on several seed-vectored microbes in several host species. We found that initially the symbiotic microbes grow on the rhizoplane in the exudate zone adjacent the root meristem. Microbes enter root tip meristem cells—locating within the periplasmic spaces between cell wall and plasma membrane. In the periplasmic spaces of root cells, microbes convert to wall-less protoplast forms. As root cells mature, microbes continue to be subjected to reactive oxygen (superoxide) produced by NADPH oxidases (NOX) on the root cell plasma membranes. Reactive oxygen degrades some of the intracellular microbes, also likely inducing electrolyte leakage from microbes—effectively extracting nutrients from microbes. Surviving bacteria in root epidermal cells trigger root hair elongation and as hairs elongate bacteria exit at the hair tips, reforming cell walls and cell shapes as microbes emerge into the rhizosphere where they may obtain additional nutrients. Precisely what nutrients are transferred through rhizophagy or how important this process is for nutrient acquisition is still unknown.

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Section: Balance Between Microbe-oxidation Susceptibility and Resimentioning

confidence: 99%

Rhizophagy Cycle: An Oxidative Process in Plants for Nutrient Extraction from Symbiotic Microbes

et al. 2018

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“…at 25 mg/mL in disc diffusion method (Radhakrishnan et al, 2016). Mohana et al (2013) reported that yellow carotenoid from Micrococcus luteus demonstrated inhibitory action against Staphylococcus aureus and Streptococcus faecalis with wide inhibition zones at the concentration ranged from 2 to 10 mg/mL. Similarly, Umadevi and Krishnaveni (2013) reported that yellow pigment produced by Micrococcus luetus, isolated from marine water showed antibacterial action with wide inhibition zones against Staphylococcus sp., Klebsiella sp.…”

Section: Antimicrobial Activitiesmentioning

confidence: 99%

Current perspective of yellowish-orange pigments from microorganisms- a review

Aruldass

Dufossé²,

Ahmad

2018

Journal of Cleaner Production

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Natural yellowish-orange pigments are derived from bacteria, yeasts, fungi and microalgae, including Chryseobacterium, Monascus and Chlorella. The purpose of this review is to provide an overview of these pigments in various aspects towards exploiting them for numerous functions. These pigments are produced in various shades of yellow-orange and categorised as carotenoids, anthraquinones, zeaxanthin, flexirubin and other compounds. They served as alternative colourants to replace hazardous and toxic synthetic pigments. Researchers are in progress to increase the pigment yield by improving the strains genetically, optimising the fermentation process and utilising cheap agroindustrial waste to reduce the production cost. Yellowish-orange pigments are applied in food, pharmaceuticals, cosmetics and textile industries. This review summarises the current technology status and challenges, economics, biosyn-thesis of pigment, novel strategies for production of yellowish-orange pigments, biological properties of pigments and metabolic engineering of microorganism with a focus on applications of pigments in food, pharmaceutical, dyeing industries as well as on other applications.

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“…Carotenoids are lipid-soluble pigments, and in bacteria they give an orange-yellow hue to colonies. Two of the five selected probiotic genera produce orange/yellow colonies (Winogradskyella, Micrococcus), and there is evidence of carotenoid production by marine Flavobacteriaceae [72,73] and Micrococcus strains [74]. A marine Flavobacteriaceae (strain GF1) was found to produce the potent antioxidant carotenoid zeaxanthin that protected Symbiodiniaceae from thermal and light stress [75].…”

Section: Genes Of Interestmentioning

confidence: 99%

Development of a free radical scavenging probiotic to mitigate coral bleaching

Dungan

Bulach²,

Lin

et al. 2020

Preprint

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ABSTRACTCorals are colonized by symbiotic microorganisms that exert a profound influence on the animal’s health. One noted symbiont is a single-celled alga (from the family Symbiodiniaceae), which provides the coral with most of its carbon. During thermal stress, the algae’s photosystems are impaired, resulting in a toxic accumulation of reactive oxygen species (ROS) that cause cellular damage to both the host and symbiont. As a protective mechanism the coral host and algal symbiont disassociate; this process is known as bleaching. Our goal was to construct a probiotic comprised of host-associated bacteria able to neutralize free radicals such as ROS. Using the coral model, the anemone Exaiptasia diaphana, and pure bacterial cultures isolated from the model animal, we identified six strains with high free radical scavenging ability belonging to the families Alteromonadaceae, Rhodobacteraceae, Flavobacteriaceae, and Micrococcaceae. In parallel, we established a “negative” probiotic consisting of genetically related strains with poor free radical scavenging capacities. From their whole genome sequences, we explore genes of interest that may contribute to the potential beneficial roles of these putative probiotic members, which may help facilitate the therapeutic application of a bacterial probiotic. Probiotics is one of several interventions currently being developed with the aim of augmenting climate resilience in corals and increasing the likelihood of coral reef persistence into the future.IMPORTANCECoral bleaching is tightly linked to the production of reactive oxygen species (ROS), whereby ROS accumulates to a toxic level in host-harboring algae cells leading to coral-algal dysbiosis. Interventions targeting toxic ROS accumulation, such as the application of exogenous antioxidants, have shown promise for maintaining the coral-algal partnership. With the feasibility of administering antioxidants directly to corals low, we have applied bioengineering strategies to develop a probiotic to neutralize toxic ROS during a thermal stress event. This probiotic can then be tested with corals or a coral model to assess its efficacy in improving coral resistance to environmental stress.

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Antioxidant, antibacterial, and ultraviolet-protective properties of carotenoids isolated from Micrococcus spp.

Cited by 55 publications

References 24 publications

Rhizophagy Cycle: An Oxidative Process in Plants for Nutrient Extraction from Symbiotic Microbes

Rhizophagy Cycle: An Oxidative Process in Plants for Nutrient Extraction from Symbiotic Microbes

Current perspective of yellowish-orange pigments from microorganisms- a review

Development of a free radical scavenging probiotic to mitigate coral bleaching

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