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Microbial metabolism and enzyme function
Research Guide
What is Microbial metabolism and enzyme function?
Microbial metabolism and enzyme function refers to the biochemical processes by which microorganisms utilize substrates like methane through specialized metabolic pathways and enzymes such as methanotrophs, lysyl oxidase, quinoproteins, and pyrroloquinoline quinone-dependent systems.
This field encompasses 36,307 papers on microbial metabolism, focusing on methanotrophy, formaldehyde oxidation, methylotrophic bacteria, and metabolic engineering in organisms like Gluconobacter strains and Rhodococcus sp. "Methanotrophic bacteria" by Hanson and Hanson (1996) classifies methanotrophs into three groups based on formaldehyde assimilation pathways, with 1655 citations. "Growth of Rhodococcus sp. strain BCP1 on gaseous n-alkanes: new metabolic insights and transcriptional analysis of two soluble di-iron monooxygenase genes" by Cappelletti et al. (2015) reveals transcriptional regulation of monooxygenases during n-alkane metabolism, garnering 1779 citations.
Topic Hierarchy
Research Sub-Topics
Methanotrophy
This sub-topic covers methane monooxygenase enzymes, carbon assimilation pathways, and physiological adaptations in aerobic methanotrophic bacteria. Researchers characterize Type I, II, and verrucomicrobial methanotrophs for greenhouse gas mitigation.
Methylotrophic Metabolism
This sub-topic examines C1 assimilation via serine cycle, ribulose monophosphate pathway, and formaldehyde detoxification in methylobacteria. Researchers engineer pathway efficiency and cofactor balance for industrial chemical production.
Pyrroloquinoline Quinone Cofactor
This sub-topic focuses on PQQ biosynthesis, dehydrogenase enzymes, and metal coordination in bacterial alcohol and sugar oxidation. Researchers study PQQ-dependent quinoproteins in Gluconobacter and bioelectrochemical applications.
Formaldehyde Oxidation Pathways
This sub-topic investigates glutathione-dependent and linear assimilation routes for formaldehyde detoxification in methylotrophs. Researchers optimize enzyme kinetics and pathway flux for high-rate C1 utilization.
Lysyl Oxidase Enzymology
This sub-topic covers copper-TPQ cofactor biogenesis, substrate specificity, and inhibition mechanisms in bacterial and eukaryotic lysyl oxidases. Researchers elucidate extracellular matrix crosslinking roles and disease associations.
Why It Matters
Methanotrophic bacteria enable the biological oxidation of methane, a potent greenhouse gas, supporting applications in bioremediation and single-cell protein production as detailed in "Methanotrophic bacteria" by Hanson and Hanson (1996, 1655 citations). Rhodococcus sp. strain BCP1 metabolizes gaseous n-alkanes while co-metabolizing low-chlorinated compounds, offering insights for environmental cleanup, per Cappelletti et al. (2015, 1779 citations). Lysyl oxidase, hypoxia-induced, mediates bone marrow cell recruitment in the premetastatic niche, linking microbial enzyme analogs to cancer progression as shown by Erler et al. (2009, 1201 citations). These functions underpin metabolic engineering for biofuel production and rare earth metal utilization in methylotrophic bacteria.
Reading Guide
Where to Start
Begin with "Methanotrophic bacteria" by Hanson and Hanson (1996) because it provides a comprehensive classification of methanotrophs based on formaldehyde assimilation pathways, serving as an accessible entry to core metabolic concepts with 1655 citations.
Key Papers Explained
Balch et al. (1979) in "Methanogens: reevaluation of a unique biological group" (2510 citations) establishes phylogenetic foundations, which Hanson and Hanson (1996) in "Methanotrophic bacteria" (1655 citations) builds upon by classifying aerobic methanotrophs into three groups using formaldehyde pathways. Cappelletti et al. (2015) in "Growth of Rhodococcus sp. strain BCP1 on gaseous n-alkanes" (1779 citations) extends this to transcriptional analysis of monooxygenases in alkane metabolism. Whittenbury et al. (1970) in "Enrichment, Isolation and Some Properties of Methane-utilizing Bacteria" (1460 citations) provides isolation methods that underpin these physiological studies. Ragsdale and Pierce (2008) in "Acetogenesis and the Wood–Ljungdahl pathway of CO2 fixation" (1244 citations) contrasts reductive pathways relevant to methanogen metabolism.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current work targets metabolic engineering of methylotrophic bacteria for rare earth metal-dependent enzymes and formaldehyde oxidation efficiency, extending Hanson and Hanson (1996) classifications. Preprint absences highlight a need for transcriptional dynamics in quinoproteins and Gluconobacter strains, building on Cappelletti et al. (2015). Lysyl oxidase studies like Erler et al. (2009) suggest frontiers in enzyme roles under hypoxia for vascular adhesion.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Methanogens: reevaluation of a unique biological group | 1979 | Microbiological Reviews | 2.5K | ✓ |
| 2 | Alpha-lipoic acid as a biological antioxidant | 1995 | Free Radical Biology a... | 1.9K | ✕ |
| 3 | Growth of Rhodococcus sp. strain BCP1 on gaseous n-alkanes: ne... | 2015 | Frontiers in Microbiology | 1.8K | ✓ |
| 4 | Methanotrophic bacteria | 1996 | Microbiological Reviews | 1.7K | ✓ |
| 5 | Enrichment, Isolation and Some Properties of Methane-utilizing... | 1970 | Journal of General Mic... | 1.5K | ✕ |
| 6 | Alteration of immunological properties of bovine serum albumin... | 1977 | Journal of Biological ... | 1.3K | ✓ |
| 7 | Structure and Spectroscopy of Copper−Dioxygen Complexes | 2004 | Chemical Reviews | 1.3K | ✕ |
| 8 | Methanotrophic bacteria. | 1996 | Microbiological Reviews | 1.3K | ✓ |
| 9 | Acetogenesis and the Wood–Ljungdahl pathway of CO2 fixation | 2008 | Biochimica et Biophysi... | 1.2K | ✓ |
| 10 | Hypoxia-Induced Lysyl Oxidase Is a Critical Mediator of Bone M... | 2009 | Cancer Cell | 1.2K | ✓ |
Frequently Asked Questions
What are methanotrophic bacteria?
Methanotrophic bacteria are gram-negative microbes related to Proteobacteria that utilize methane as a carbon source via formaldehyde assimilation pathways. Hanson and Hanson (1996) classify them into three groups based on these pathways. They play key roles in global methane cycling.
How do methanotrophs assimilate formaldehyde?
Methanotrophs assimilate formaldehyde, their primary carbon source, through distinct pathways defining three physiological groups. "Methanotrophic bacteria" by Hanson and Hanson (1996) details these classifications. This process supports growth on methane and methanol.
What enzymes enable Rhodococcus sp. BCP1 to grow on n-alkanes?
Rhodococcus sp. strain BCP1 uses soluble di-iron monooxygenases for gaseous n-alkane metabolism. Cappelletti et al. (2015) provide transcriptional analysis of two such genes induced by n-alkanes up to n-heptane. These enzymes also facilitate co-metabolism of chlorinated compounds.
What is the role of lysyl oxidase in microbial contexts?
Lysyl oxidase functions in cross-linking extracellular matrix proteins, with hypoxia-induced forms recruiting bone marrow cells to premetastatic niches. Erler et al. (2009) demonstrate its critical mediation in cancer metastasis. Microbial analogs appear in quinoprotein and oxidative metabolism studies.
How was methane-utilizing bacteria first isolated?
Over 100 gram-negative, aerobic methane-utilizing bacteria were isolated using only methane and methanol as growth substrates. Whittenbury et al. (1970) classified them into five groups by morphology and resting stages. This foundational work enabled early methanotroph studies.
What defines methanogens as a unique group?
Methanogens form a distinct biological group characterized by unique ribosomal RNA sequences and methanogenesis. Balch et al. (1979) reevaluated their phylogeny in "Methanogens: reevaluation of a unique biological group," with 2510 citations. They differ from typical bacteria in energy metabolism.
Open Research Questions
- ? How do rare earth metals regulate quinoprotein expression in methylotrophic bacteria?
- ? What transcriptional mechanisms control di-iron monooxygenase genes during n-alkane co-metabolism in Rhodococcus?
- ? Can metabolic engineering of formaldehyde oxidation pathways enhance methanotroph bioremediation efficiency?
- ? How does pyrroloquinoline quinone influence enzyme function in Gluconobacter strains under industrial conditions?
- ? What are the limits of lysyl oxidase activity in vascular adhesion protein-1 during hypoxia?
Recent Trends
The field spans 36,307 works with sustained interest in methanotrophy, as evidenced by high citations for classics like Balch et al. (1979, 2510 citations) and Packer et al. (1995, 1947 citations) on alpha-lipoic acid antioxidants relevant to enzyme protection.
Recent high-impact papers like Cappelletti et al. (2015, 1779 citations) emphasize transcriptional regulation in n-alkane metabolism by Rhodococcus BCP1. No new preprints or news in the last 6-12 months indicates steady rather than explosive growth.
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