Methylobacterium radiotolerans is considered an uncommon pathogen, and the number of reported cases is limited. It primarily affects immunocompromised or debilitated patients, making them more susceptible to infection.
Since its first description in 1995, only a few cases have been reported in the literature. The most common clinical manifestations of M. radiotolerans infection are bacteremia, endocarditis, and pneumonia. These infections are often associated with using central venous catheters or other medical devices.
The global distribution of M. radiotolerans infections needs to be well-documented, but most reported cases have been from Asia and Europe. However, its prevalence may be underestimated due to its frequent misidentification or oversight by conventional diagnostic methods.
Prevalence rates of M. radiotolerans infection are challenging to estimate, but some studies suggest it may account for a small percentage of bacterial isolates from blood cultures, ranging from 0.01% to 0.03%. The prevalence can vary depending on geographic regions, patient populations, and diagnostic techniques.
The mortality rate of M. radiotolerans infection is variable, ranging from 0% to 50%, depending on factors such as the severity of the infection and the host’s immune status. Risk factors like immunosuppression, antibiotic therapy, and parenteral nutrition increase the likelihood of infection.
Regarding treatment, the susceptibility of M. radiotolerans to antifungal drugs can vary among strains. Aminoglycosides and ciprofloxacin are commonly used to treat these infections, but their efficacy and resistance rates may differ based on the specific strain of the bacterium.
Kingdom: Bacteria
Phylum: Pseudomonadota
Class: Alphaproteobacteria
Order: Hyphomicrobiales
Family: Methylobacteriaceae
Genus:Methylobacterium
Species:Methylobacterium radiotolerans
Methylobacterium radiotolerans is a rod-shaped bacterium with parameters of 0.5-0.8 μm width and 1.5-2.5 μm length. One of its distinguishing characteristics is its pink coloration due to the presence of carotenoids, which act as UV-protective agents.
The linear genome is composed of one circular chromosome & two plasmids, having an overall size of around 6.8 Mb. The genome comprises around 6,300 genes, approximately 5,900 of which are protein-coding.
The cell wall comprises peptidoglycan, lipopolysaccharide, & mannoprotein, and it serves as structural support and protection.
Phospholipids and hopanoids are found in the cell membrane and contribute to cell integrity & membrane stability.The nucleoid, cytoplasmic inclusions, ribosomes (protein synthesis), & membrane vesicles are all located inside the cell.
Because of DNA repair enzymes & antioxidant enzymes that protect the bacteria from radiation-induced damage, Methylobacterium radiotolerans can resist large doses of ionizing radiation. Furthermore, the formation of carotenoid pigments & polyphosphate granules improves its radiation stress tolerance. These processes allow M. radiotolerans to survive in high-radiation conditions, giving it an outstanding radiation-resistant pathogen.
Another important virulent feature of M. radiotolerans is its capacity to use one-carbon molecules like methanol as energy and carbon sources. This metabolic characteristic is facilitated by MxaF and XoxF methanol dehydrogenases (MDHs). Notably, XoxF is a lanthanide-dependent enzyme that confers greater methanol tolerance and growth rates on the bacterium than MxaF. Additionally, M. radiotolerans has two formaldehyde oxidation pathways: the H4MPT pathway & the glutathione-dependent pathway, contributing to its methylotrophic properties.
Studies have identified three classifications of Methylobacterium radiotolerans based on molecular weight- medium molecular weight (MMW), low molecular weight (LMW), & high molecular weight (HMW) mannans. LMW mannans have a molecular weight below 10 kDa, MMW mannans range between 10-40 kDa, and HMW mannans have a molecular weight exceeding 40 kDa.
Methylobacterium radiotolerans is a unique bacterium with rare pathogenic features. It can cause infection and sickness as an opportunistic pathogen, especially in immunocompromised people. Cell wall proteins, enzymes, capsule formation, oxidative stress response, & antibiotic resistance are all pathogenicity factors.
M. radiotoleran‘s pathogenesis consists of multiple phases. Adhesion refers to the ability of a pathogen to attach to host cells or surfaces, which is promoted by cell wall proteins like mannoproteins & agglutinins. It enables the bacterium to colonize & stay within the host while evading the immune system.
Another critical feature is invasion, in which the bacterium can enter host tissues or cells thanks to enzymes such as phospholipases and proteases. It allows M. radiotolerans to access critical nutrients, damage tissue, & induce inflammation.
The dissemination capability of M. radiotolerans leads to the spread from the initial site of infection to other parts of the body, facilitated by processes like budding and pseudohyphal growth. It allows the bacterium to cause systemic infections and potentially affect distant organs.
Since Methylobacterium radiotolerans is a rare and opportunistic pathogen, specific information on the human host defense against this bacterium is not exclusively studied. It seems to be limited in the available literature.
Methylobacterium radiotolerans is a non-pathogenic bacteria found in a variety of settings. However, in rare cases, it can transform into an opportunistic pathogen & cause infection in immunocompromised or weakened people. Bacteremia, or bacteria in the circulation, is the most common clinical symptom of M. radiotolerans infection.
Bacteremia can occur because of medical equipment contamination, such as intravenous catheters, parenteral nutrition, or blood products. This bloodstream infection, which causes symptoms such as chills, fever, malaise, hypotension, and organ failure, can progress to severe complications like septic shock or endocarditis.
While bacteremia is the most common clinical manifestation, M. radiotolerans can also cause infections in other body regions less frequently. Diarrhea, abdominal pain, bloating, & malabsorption are all indications of a gastrointestinal infection. Stomatitis, glossitis, cheilitis, and denture stomatitis are all disorders caused by oral infection. Dermatitis, folliculitis, cellulitis, & granuloma annulare are all examples of skin infections.
Culture method:Methylobacterium radiotolerans can be cultured on specific media, but its growth is delayed, usually taking 4-5 days at temperatures ranging from 25°C to 30°C. The colonies formed are small and display a distinct pink color. Sabouraud agar is considered the most favorable medium for its growth, but it can also grow on modified Thayer-Martin, buffered charcoal yeast extract, and Middlebrook 7H11 agar.
Gram Staining: Upon Gram staining, Methylobacterium radiotolerans appear straight or slightly curved, pleomorphic, asporogenous, and vacuolated bacilli. This staining method is one of the initial steps in identifying the bacterium.
Mass spectrometry using matrix-assisted laser ionization/desorption-time of flight (MALDI-TOF MS): It is a powerful and rapid diagnostic tool for identifying microorganisms. Subjecting the isolated bacteria to this technique can compare their unique protein profiles with a database, enabling accurate and quick identification of Methylobacterium radiotolerans.
Judicious and appropriate use of antibiotics is crucial to prevent the emergence of antimicrobial-resistant strains of M. radiotolerans.
Regular and thorough cleaning and disinfection of patient care areas and equipment can help prevent the transmission of M. radiotolerans between patients.
If a patient is diagnosed with an M. radiotolerans infection, appropriate isolation precautions should be implemented to prevent the bacterium’s spread to other patients.
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Home » Pathogen » Methylobacterium radiotolerans
Methylobacterium radiotolerans
Updated :
December 6, 2023
Methylobacterium radiotolerans is considered an uncommon pathogen, and the number of reported cases is limited. It primarily affects immunocompromised or debilitated patients, making them more susceptible to infection.
Since its first description in 1995, only a few cases have been reported in the literature. The most common clinical manifestations of M. radiotolerans infection are bacteremia, endocarditis, and pneumonia. These infections are often associated with using central venous catheters or other medical devices.
The global distribution of M. radiotolerans infections needs to be well-documented, but most reported cases have been from Asia and Europe. However, its prevalence may be underestimated due to its frequent misidentification or oversight by conventional diagnostic methods.
Prevalence rates of M. radiotolerans infection are challenging to estimate, but some studies suggest it may account for a small percentage of bacterial isolates from blood cultures, ranging from 0.01% to 0.03%. The prevalence can vary depending on geographic regions, patient populations, and diagnostic techniques.
The mortality rate of M. radiotolerans infection is variable, ranging from 0% to 50%, depending on factors such as the severity of the infection and the host’s immune status. Risk factors like immunosuppression, antibiotic therapy, and parenteral nutrition increase the likelihood of infection.
Regarding treatment, the susceptibility of M. radiotolerans to antifungal drugs can vary among strains. Aminoglycosides and ciprofloxacin are commonly used to treat these infections, but their efficacy and resistance rates may differ based on the specific strain of the bacterium.
Kingdom: Bacteria
Phylum: Pseudomonadota
Class: Alphaproteobacteria
Order: Hyphomicrobiales
Family: Methylobacteriaceae
Genus:Methylobacterium
Species:Methylobacterium radiotolerans
Methylobacterium radiotolerans is a rod-shaped bacterium with parameters of 0.5-0.8 μm width and 1.5-2.5 μm length. One of its distinguishing characteristics is its pink coloration due to the presence of carotenoids, which act as UV-protective agents.
The linear genome is composed of one circular chromosome & two plasmids, having an overall size of around 6.8 Mb. The genome comprises around 6,300 genes, approximately 5,900 of which are protein-coding.
The cell wall comprises peptidoglycan, lipopolysaccharide, & mannoprotein, and it serves as structural support and protection.
Phospholipids and hopanoids are found in the cell membrane and contribute to cell integrity & membrane stability.The nucleoid, cytoplasmic inclusions, ribosomes (protein synthesis), & membrane vesicles are all located inside the cell.
Because of DNA repair enzymes & antioxidant enzymes that protect the bacteria from radiation-induced damage, Methylobacterium radiotolerans can resist large doses of ionizing radiation. Furthermore, the formation of carotenoid pigments & polyphosphate granules improves its radiation stress tolerance. These processes allow M. radiotolerans to survive in high-radiation conditions, giving it an outstanding radiation-resistant pathogen.
Another important virulent feature of M. radiotolerans is its capacity to use one-carbon molecules like methanol as energy and carbon sources. This metabolic characteristic is facilitated by MxaF and XoxF methanol dehydrogenases (MDHs). Notably, XoxF is a lanthanide-dependent enzyme that confers greater methanol tolerance and growth rates on the bacterium than MxaF. Additionally, M. radiotolerans has two formaldehyde oxidation pathways: the H4MPT pathway & the glutathione-dependent pathway, contributing to its methylotrophic properties.
Studies have identified three classifications of Methylobacterium radiotolerans based on molecular weight- medium molecular weight (MMW), low molecular weight (LMW), & high molecular weight (HMW) mannans. LMW mannans have a molecular weight below 10 kDa, MMW mannans range between 10-40 kDa, and HMW mannans have a molecular weight exceeding 40 kDa.
Methylobacterium radiotolerans is a unique bacterium with rare pathogenic features. It can cause infection and sickness as an opportunistic pathogen, especially in immunocompromised people. Cell wall proteins, enzymes, capsule formation, oxidative stress response, & antibiotic resistance are all pathogenicity factors.
M. radiotoleran‘s pathogenesis consists of multiple phases. Adhesion refers to the ability of a pathogen to attach to host cells or surfaces, which is promoted by cell wall proteins like mannoproteins & agglutinins. It enables the bacterium to colonize & stay within the host while evading the immune system.
Another critical feature is invasion, in which the bacterium can enter host tissues or cells thanks to enzymes such as phospholipases and proteases. It allows M. radiotolerans to access critical nutrients, damage tissue, & induce inflammation.
The dissemination capability of M. radiotolerans leads to the spread from the initial site of infection to other parts of the body, facilitated by processes like budding and pseudohyphal growth. It allows the bacterium to cause systemic infections and potentially affect distant organs.
Since Methylobacterium radiotolerans is a rare and opportunistic pathogen, specific information on the human host defense against this bacterium is not exclusively studied. It seems to be limited in the available literature.
Methylobacterium radiotolerans is a non-pathogenic bacteria found in a variety of settings. However, in rare cases, it can transform into an opportunistic pathogen & cause infection in immunocompromised or weakened people. Bacteremia, or bacteria in the circulation, is the most common clinical symptom of M. radiotolerans infection.
Bacteremia can occur because of medical equipment contamination, such as intravenous catheters, parenteral nutrition, or blood products. This bloodstream infection, which causes symptoms such as chills, fever, malaise, hypotension, and organ failure, can progress to severe complications like septic shock or endocarditis.
While bacteremia is the most common clinical manifestation, M. radiotolerans can also cause infections in other body regions less frequently. Diarrhea, abdominal pain, bloating, & malabsorption are all indications of a gastrointestinal infection. Stomatitis, glossitis, cheilitis, and denture stomatitis are all disorders caused by oral infection. Dermatitis, folliculitis, cellulitis, & granuloma annulare are all examples of skin infections.
Culture method:Methylobacterium radiotolerans can be cultured on specific media, but its growth is delayed, usually taking 4-5 days at temperatures ranging from 25°C to 30°C. The colonies formed are small and display a distinct pink color. Sabouraud agar is considered the most favorable medium for its growth, but it can also grow on modified Thayer-Martin, buffered charcoal yeast extract, and Middlebrook 7H11 agar.
Gram Staining: Upon Gram staining, Methylobacterium radiotolerans appear straight or slightly curved, pleomorphic, asporogenous, and vacuolated bacilli. This staining method is one of the initial steps in identifying the bacterium.
Mass spectrometry using matrix-assisted laser ionization/desorption-time of flight (MALDI-TOF MS): It is a powerful and rapid diagnostic tool for identifying microorganisms. Subjecting the isolated bacteria to this technique can compare their unique protein profiles with a database, enabling accurate and quick identification of Methylobacterium radiotolerans.
Judicious and appropriate use of antibiotics is crucial to prevent the emergence of antimicrobial-resistant strains of M. radiotolerans.
Regular and thorough cleaning and disinfection of patient care areas and equipment can help prevent the transmission of M. radiotolerans between patients.
If a patient is diagnosed with an M. radiotolerans infection, appropriate isolation precautions should be implemented to prevent the bacterium’s spread to other patients.
Methylobacterium radiotolerans is considered an uncommon pathogen, and the number of reported cases is limited. It primarily affects immunocompromised or debilitated patients, making them more susceptible to infection.
Since its first description in 1995, only a few cases have been reported in the literature. The most common clinical manifestations of M. radiotolerans infection are bacteremia, endocarditis, and pneumonia. These infections are often associated with using central venous catheters or other medical devices.
The global distribution of M. radiotolerans infections needs to be well-documented, but most reported cases have been from Asia and Europe. However, its prevalence may be underestimated due to its frequent misidentification or oversight by conventional diagnostic methods.
Prevalence rates of M. radiotolerans infection are challenging to estimate, but some studies suggest it may account for a small percentage of bacterial isolates from blood cultures, ranging from 0.01% to 0.03%. The prevalence can vary depending on geographic regions, patient populations, and diagnostic techniques.
The mortality rate of M. radiotolerans infection is variable, ranging from 0% to 50%, depending on factors such as the severity of the infection and the host’s immune status. Risk factors like immunosuppression, antibiotic therapy, and parenteral nutrition increase the likelihood of infection.
Regarding treatment, the susceptibility of M. radiotolerans to antifungal drugs can vary among strains. Aminoglycosides and ciprofloxacin are commonly used to treat these infections, but their efficacy and resistance rates may differ based on the specific strain of the bacterium.
Kingdom: Bacteria
Phylum: Pseudomonadota
Class: Alphaproteobacteria
Order: Hyphomicrobiales
Family: Methylobacteriaceae
Genus:Methylobacterium
Species:Methylobacterium radiotolerans
Methylobacterium radiotolerans is a rod-shaped bacterium with parameters of 0.5-0.8 μm width and 1.5-2.5 μm length. One of its distinguishing characteristics is its pink coloration due to the presence of carotenoids, which act as UV-protective agents.
The linear genome is composed of one circular chromosome & two plasmids, having an overall size of around 6.8 Mb. The genome comprises around 6,300 genes, approximately 5,900 of which are protein-coding.
The cell wall comprises peptidoglycan, lipopolysaccharide, & mannoprotein, and it serves as structural support and protection.
Phospholipids and hopanoids are found in the cell membrane and contribute to cell integrity & membrane stability.The nucleoid, cytoplasmic inclusions, ribosomes (protein synthesis), & membrane vesicles are all located inside the cell.
Because of DNA repair enzymes & antioxidant enzymes that protect the bacteria from radiation-induced damage, Methylobacterium radiotolerans can resist large doses of ionizing radiation. Furthermore, the formation of carotenoid pigments & polyphosphate granules improves its radiation stress tolerance. These processes allow M. radiotolerans to survive in high-radiation conditions, giving it an outstanding radiation-resistant pathogen.
Another important virulent feature of M. radiotolerans is its capacity to use one-carbon molecules like methanol as energy and carbon sources. This metabolic characteristic is facilitated by MxaF and XoxF methanol dehydrogenases (MDHs). Notably, XoxF is a lanthanide-dependent enzyme that confers greater methanol tolerance and growth rates on the bacterium than MxaF. Additionally, M. radiotolerans has two formaldehyde oxidation pathways: the H4MPT pathway & the glutathione-dependent pathway, contributing to its methylotrophic properties.
Studies have identified three classifications of Methylobacterium radiotolerans based on molecular weight- medium molecular weight (MMW), low molecular weight (LMW), & high molecular weight (HMW) mannans. LMW mannans have a molecular weight below 10 kDa, MMW mannans range between 10-40 kDa, and HMW mannans have a molecular weight exceeding 40 kDa.
Methylobacterium radiotolerans is a unique bacterium with rare pathogenic features. It can cause infection and sickness as an opportunistic pathogen, especially in immunocompromised people. Cell wall proteins, enzymes, capsule formation, oxidative stress response, & antibiotic resistance are all pathogenicity factors.
M. radiotoleran‘s pathogenesis consists of multiple phases. Adhesion refers to the ability of a pathogen to attach to host cells or surfaces, which is promoted by cell wall proteins like mannoproteins & agglutinins. It enables the bacterium to colonize & stay within the host while evading the immune system.
Another critical feature is invasion, in which the bacterium can enter host tissues or cells thanks to enzymes such as phospholipases and proteases. It allows M. radiotolerans to access critical nutrients, damage tissue, & induce inflammation.
The dissemination capability of M. radiotolerans leads to the spread from the initial site of infection to other parts of the body, facilitated by processes like budding and pseudohyphal growth. It allows the bacterium to cause systemic infections and potentially affect distant organs.
Since Methylobacterium radiotolerans is a rare and opportunistic pathogen, specific information on the human host defense against this bacterium is not exclusively studied. It seems to be limited in the available literature.
Methylobacterium radiotolerans is a non-pathogenic bacteria found in a variety of settings. However, in rare cases, it can transform into an opportunistic pathogen & cause infection in immunocompromised or weakened people. Bacteremia, or bacteria in the circulation, is the most common clinical symptom of M. radiotolerans infection.
Bacteremia can occur because of medical equipment contamination, such as intravenous catheters, parenteral nutrition, or blood products. This bloodstream infection, which causes symptoms such as chills, fever, malaise, hypotension, and organ failure, can progress to severe complications like septic shock or endocarditis.
While bacteremia is the most common clinical manifestation, M. radiotolerans can also cause infections in other body regions less frequently. Diarrhea, abdominal pain, bloating, & malabsorption are all indications of a gastrointestinal infection. Stomatitis, glossitis, cheilitis, and denture stomatitis are all disorders caused by oral infection. Dermatitis, folliculitis, cellulitis, & granuloma annulare are all examples of skin infections.
Culture method:Methylobacterium radiotolerans can be cultured on specific media, but its growth is delayed, usually taking 4-5 days at temperatures ranging from 25°C to 30°C. The colonies formed are small and display a distinct pink color. Sabouraud agar is considered the most favorable medium for its growth, but it can also grow on modified Thayer-Martin, buffered charcoal yeast extract, and Middlebrook 7H11 agar.
Gram Staining: Upon Gram staining, Methylobacterium radiotolerans appear straight or slightly curved, pleomorphic, asporogenous, and vacuolated bacilli. This staining method is one of the initial steps in identifying the bacterium.
Mass spectrometry using matrix-assisted laser ionization/desorption-time of flight (MALDI-TOF MS): It is a powerful and rapid diagnostic tool for identifying microorganisms. Subjecting the isolated bacteria to this technique can compare their unique protein profiles with a database, enabling accurate and quick identification of Methylobacterium radiotolerans.
Judicious and appropriate use of antibiotics is crucial to prevent the emergence of antimicrobial-resistant strains of M. radiotolerans.
Regular and thorough cleaning and disinfection of patient care areas and equipment can help prevent the transmission of M. radiotolerans between patients.
If a patient is diagnosed with an M. radiotolerans infection, appropriate isolation precautions should be implemented to prevent the bacterium’s spread to other patients.
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