Acinetobacter baumannii

General Information

Acinetobacter baumannii is a highly significant microorganism in the field of medical microbiology due to its remarkable ability to develop resistance to multiple antibiotics. This characteristic makes it a major concern in hospital settings, where it is often associated with severe infections such as pneumonia, bloodstream infections, and wound infections, particularly in immunocompromised patients. One of the most intriguing aspects of A. baumannii is its genetic plasticity, which allows it to acquire and disseminate resistance genes rapidly. This adaptability is facilitated by its ability to uptake foreign DNA from the environment, a process known as horizontal gene transfer. Additionally, A. baumannii is known for its survival capabilities in harsh conditions. It can persist on various surfaces for extended periods, contributing to its role in nosocomial infections. This resilience is partly due to its ability to withstand desiccation and disinfectants, making infection control particularly challenging. From a research perspective, A. baumannii is valuable for studying antibiotic resistance mechanisms and the development of new therapeutic strategies. Its resistance to carbapenems, a class of last-resort antibiotics, has driven significant research efforts to understand the underlying genetic and biochemical pathways involved. Moreover, A. baumannii has been a model organism for studying biofilm formation on medical devices, which is a critical factor in its pathogenicity. Biofilms protect the bacteria from the host immune response and antibiotic treatment, leading to chronic and recurrent infections. In summary, Acinetobacter baumannii is a microorganism of great interest due to its antibiotic resistance, genetic adaptability, and survival in adverse conditions, making it a focal point for research aimed at combating multidrug-resistant infections.

Acinetobacter baumannii is a notable opportunistic pathogen primarily associated with healthcare-associated infections. This bacterium is particularly interesting due to its remarkable antibiotic resistance capabilities, which have made it a significant concern in clinical settings. It is often implicated in infections such as pneumonia, bloodstream infections, and wound infections, especially in immunocompromised patients or those with prolonged hospital stays. One of the unique characteristics of A. baumannii is its ability to survive in harsh environments, including desiccation and exposure to disinfectants. This resilience contributes to its persistence in hospital settings, where it can be found on various surfaces and medical equipment. The organism's genetic plasticity allows it to acquire resistance genes from other bacteria, further complicating treatment options. From a research perspective, A. baumannii serves as a model organism for studying multidrug resistance mechanisms and the evolution of pathogenicity. Its genome has been sequenced, providing insights into the genetic basis of its virulence and resistance traits. Researchers are particularly interested in understanding the mechanisms behind its ability to form biofilms, which contribute to its persistence in clinical environments and its resistance to both the immune response and antibiotic treatment. In addition to its clinical significance, A. baumannii is also a subject of interest in the field of biotechnology. Some studies have explored its potential for bioremediation, as certain strains can degrade environmental pollutants. This dual role as a pathogen and a potential biotechnological tool makes A. baumannii a fascinating organism for ongoing research and public health discussions.

Taxonomy

Superkingdom: Bacteria

Phylum: Pseudomonadota

Class: Gammaproteobacteria

Order: Moraxellales

Family: Moraxellaceae

Genus: Acinetobacter

Species: Acinetobacter baumannii

NCBI ID

470

Genome Info

FTP Path:
ftp.ncbi.nlm.nih.gov/genomes/all/GCF/008/632/635/GCF_008632635.1_ASM863263v1

File for sequence-based predictions:
GCF_008632635.1_ASM863263v1_genomic.fasta

Descriptions

Clinical Implications and Relevance

Source: gpt-4o-mini-2024-07-18

The bacterium Acinetobacter baumannii is a significant opportunistic pathogen known for its role in various infections in healthcare settings, particularly in immunocompromised patients. It is associated with ventilator-associated pneumonia, bloodstream infections, and wound infections, especially in patients with open wounds or those undergoing invasive procedures. The organism is notorious for its antimicrobial resistance, often exhibiting resistance to multiple classes of antibiotics, including beta-lactams, aminoglycosides, and fluoroquinolones, which complicates treatment options and leads to increased morbidity and mortality rates. Acinetobacter baumannii employs several immune evasion strategies, such as biofilm formation and the production of outer membrane proteins that inhibit phagocytosis, allowing it to persist in the hospital environment and evade the host's immune response. This pathogen has been implicated in numerous outbreaks, particularly in intensive care units, where it can spread rapidly among patients. In addition to its role as a pathogen, there is ongoing research into the potential use of Acinetobacter baumannii in biotechnological applications, such as bioremediation, due to its ability to degrade various environmental pollutants. However, its clinical implications as a multidrug-resistant organism overshadow these potential benefits, making it a critical focus for infection control and antibiotic stewardship programs.

Habitat and Ecological Niches

Source: gpt-4o-mini-2024-07-18

Acinetobacter baumannii is a versatile bacterium commonly found in various habitat types and environments, particularly in urban and hospital settings. This organism thrives in moist environments and is often associated with soil, water, and human-made environments such as medical facilities. Its ability to survive on surfaces for extended periods makes it a significant concern in healthcare-associated infections. In terms of ecological niches, A. baumannii is frequently isolated from wounds, respiratory secretions, and urine of infected patients, indicating its role as an opportunistic pathogen. It can also be found in natural environments like marine ecosystems and freshwater systems, where it may play a role in nutrient cycling and organic matter decomposition. Notably, A. baumannii exhibits a remarkable capacity for environmental adaptation, allowing it to withstand various stressors such as desiccation, extreme temperatures, and antibiotic pressure. This adaptability is partly due to its ability to form biofilms, which enhances its survival in hostile environments and contributes to its persistence in clinical settings. In terms of interactions, A. baumannii can engage in symbiotic relationships with other microorganisms, influencing microbial community dynamics. Its presence can affect the composition of microbial flora in both natural and artificial environments, highlighting its role in ecosystem functioning and microbial ecology. Overall, the biomes associated with Acinetobacter baumannii are diverse, ranging from urban environments to natural ecosystems, where it plays a complex role as both a pathogen and a participant in ecological processes.

Industrial Application

Source: gpt-4o-mini-2024-07-18

The microorganism Acinetobacter baumannii has garnered attention for its potential industrial applications, particularly in the fields of biotechnology and waste management. This organism is known for its ability to thrive in various environments, making it a candidate for biodegradation processes, where it can break down pollutants and organic waste materials. Its metabolic versatility allows it to utilize a range of carbon sources, which is beneficial in the treatment of contaminated sites, particularly in the degradation of hydrocarbons and other toxic compounds. In the realm of biofuel production, Acinetobacter baumannii has been studied for its capacity to produce lipids, which can be converted into biodiesel. The organism's ability to accumulate significant amounts of lipids during its growth phase makes it a valuable asset in the development of sustainable energy sources. This process often involves fermentation techniques that optimize lipid production under specific growth conditions. Moreover, Acinetobacter baumannii has been explored for its pharmaceutical development potential, particularly in the production of antimicrobial compounds. Its natural resistance mechanisms and ability to produce various secondary metabolites can be harnessed for the development of new antibiotics or other therapeutic agents. This aspect is particularly crucial given the rising concern over antibiotic resistance in clinical settings. Overall, the industrial applications of Acinetobacter baumannii span across waste management, biofuel production, and pharmaceutical development, showcasing its versatility and importance in various biotechnological processes.

Phenotypes and Predictions

The table shows the phenotypes and predictions. Cell colors indicate the class of the value. When literature-based data is available, a checkmark (✓) indicates a correct prediction, while an ✗ indicates an incorrect prediction.

Literature-based phenotypes: 11

LLM predicted phenotypes: 2

Phenotype	High-quality annotation	anthropic/claude-3.5-sonnet	microsoft/phi-3-mini-128k-instruct	google/gemini-flash-1.5	mistralai/mixtral-8x7b-instruct:nitro	google/gemini-pro-1.5	perplexity/llama-3-sonar-small-32k-chat	anthropic/claude-3-haiku:beta	openchat/openchat-7b	google/gemini-pro	meta-llama/llama-3-70b-instruct:nitro	openai/gpt-4o	openai/gpt-4o	meta-llama/llama-3-8b-instruct:nitro	meta-llama/llama-3-8b-instruct:nitro	google/gemma-7b-it	google/gemma-7b-it	openai/gpt-3.5-turbo-0125	openai/gpt-3.5-turbo-0125	microsoft/wizardlm-2-8x22b	microsoft/wizardlm-2-8x22b	google/palm-2-chat-bison-32k	google/palm-2-chat-bison-32k	openai/gpt-4	openai/gpt-4	mistralai/mistral-7b-instruct	mistralai/mistral-7b-instruct
Motility	FALSE	false ✓	false ✓	false ✓	false ✓	false ✓	true ✗	true ✗	false ✓	true ✗	false ✓	false ✓	false ✓	true ✗	true ✗	true ✗	true ✗	false ✓	false ✓	false ✓	false ✓	true ✗	true ✗	false ✓	false ✓	false ✓	false ✓
Gram staining	gram stain negative	gram stain negative ✓	gram stain negative ✓	gram stain negative ✓	gram stain negative ✓	gram stain negative ✓	gram stain negative ✓	gram stain negative ✓	gram stain negative ✓	gram stain negative ✓	gram stain negative ✓	N/A	gram stain negative ✓	N/A	gram stain negative ✓	N/A	gram stain negative ✓	N/A	gram stain negative ✓	N/A	gram stain negative ✓	N/A	gram stain negative ✓	N/A	gram stain negative ✓	N/A	gram stain negative ✓
Aerophilicity	aerobic	aerobic ✓	facultatively anaerobic ✗	N/A	facultatively anaerobic ✗	aerobic ✓	N/A	N/A	N/A	N/A	N/A	aerobic ✓	aerobic ✓	aerotolerant ✗	aerotolerant ✗	N/A	N/A	facultatively anaerobic ✗	facultatively anaerobic ✗	aerobic ✓	aerobic ✓	N/A	N/A	N/A	N/A	N/A	N/A
Extreme environment tolerance	FALSE	true ✗	true ✗	true ✗	true ✗	true ✗	true ✗	true ✗	false ✓	false ✓	true ✗	true ✗	true ✗	true ✗	true ✗	true ✗	true ✗	false ✓	false ✓	true ✗	true ✗	false ✓	false ✓	false ✓	false ✓	true ✗	true ✗
Biofilm formation	N/A	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true
Animal pathogenicity	TRUE	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓
Biosafety level	biosafety level 2	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 2 ✓	biosafety level 3 ✗	biosafety level 3 ✗
Health association	N/A	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true	true
Host association	TRUE	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	false ✗	false ✗	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓	true ✓
Plant pathogenicity	FALSE	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	true ✗	true ✗	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓
Spore formation	FALSE	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓	false ✓
Hemolysis	gamma	gamma ✓	N/A	gamma ✓	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	alpha ✗	alpha ✗	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Cell shape	bacillus	bacillus ✓	coccus ✗	coccus ✗	bacillus ✓	coccus ✗	coccus ✗	bacillus ✓	coccus ✗	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	coccus ✗	coccus ✗	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓	bacillus ✓

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