Electrogen · Iron reducer · Manganese reducer
Shewanella oneidensis MR-4
Also known as S. oneidensis MR-4
Pseudomonadota · Gammaproteobacteria · Shewanellaceae
- Shewanella
- Electrogen
- Marine
- Tier 2
01 · Identity
Identity
Where this organism sits in the tree of life, how to obtain it, and what a cell looks like.
Lineage
- domainBacteria
- ›phylumPseudomonadota
- ›classGammaproteobacteria
- ›orderAlteromonadales
- ›familyShewanellaceae
- ›genusShewanella
- ›speciesShewanella oneidensis MR-4
Culture collections & accessions
- NCBI taxon
- 60480
Cell morphology
Rod, Gram-negative (diderm)
- Motile: yes
02 · Electron transfer
Electron transfer
How electrons cross the cell envelope — the property that makes a microbe useful in an electrochemical system.
Mechanisms
- Outer-membrane cytochromes: yes
- Endogenous shuttles: yes
Direct transfer — detail
- Notes
- Mtr pathway (MtrCAB, OmcA) homologous to MR-1; performance and shuttle production slightly different.
- Completeness
- Mapped
Mediated transfer — detail
- Completeness
- Mapped
03 · Growth envelope
Growth envelope
The conditions this organism tolerates and what it eats and breathes — the operating window for a reactor.
Energy metabolism
Electron donors
- Lactate
- H2
- Formate
Electron acceptors
- O2
- Fe(III)
- Mn(IV)
- Anode
- Dmso
- Tmao
Carbon sources
- Lactate
- Formate
- Respiratory: yes
04 · Growth & electron-transfer kinetics
Growth & electron-transfer kinetics
How fast this organism grows and how hard it pushes electrons into an anode, as the corpus reports it, and what those constants imply when you run them.
Kinetic evidence
| Parameter | Median | 10–90 % | n | Source |
|---|---|---|---|---|
| Max. specific growth rate μmax | 0.014 h⁻¹ | — | 1 | 1 paper |
| Half-saturation constant Ks | 124 mg/L | — | 1 | 1 paper |
| Biomass yield Y | 0.1 g/g | 0.05–0.18 | 3 | genus prior · 3 refs |
| Decay coefficient kd | Not in the corpus yet | |||
| Exchange current density i₀ | Not in the corpus yet | |||
| Transfer coefficient α | Not in the corpus yet | |||
| Tafel slope | Not in the corpus yet | |||
Median of the extracted values, the 10–90 % spread behind it and how many values it pools.
1 rows were not pooled: their unit could not be converted unambiguously.
Evidence rows (3)
- Max. specific growth rate μmax0.014 h⁻¹Not verifiedspecies rowconfidence 1
Metabolic Characteristics of a Glucose-Utilizing Shewanella oneidensis Strain Grown under Electrode-Respiring Conditions · 2015 · 10.1371/journal.pone.0138813
“This difference in the current densities may reflect a difference in the growth rates of this strain in GMM and LMM (0.014 h⁻¹ and 0.35 h⁻¹, respectively, under fumarate-reducing conditions).”
- Half-saturation constant Ks124 mg/LNot verifiedspecies rowconfidence 1
Performance of a Batch Operation Microbial Fuel Cell (MFC) with Cobalt Micronutrient Addition Based on Kinetic Models · 2024 · 10.9767/bcrec.20259
“Utami reported that MFCs with tempeh waste substrate produced a kinetic parameter value Ks of 124 mg/L with a power density of 0.033 mW/m² [10].”
Listed, not pooled (1)
- Max. specific growth rate μmax0.35 h⁻¹Not verifiedspecies rowconfidence 1
Metabolic Characteristics of a Glucose-Utilizing Shewanella oneidensis Strain Grown under Electrode-Respiring Conditions · 2015 · 10.1371/journal.pone.0138813
“This difference in the current densities may reflect a difference in the growth rates of this strain in GMM and LMM (0.014 h⁻¹ and 0.35 h⁻¹, respectively, under fumarate-reducing conditions).”
Not used in an estimate · substrate: lactate; the pooled substrate is glucose
Genus-level prior: Shewanella oneidensis
A genus-level prior is a summary for the whole genus, not a measurement on this strain.
Constants that drive the simulation
Scenario — values you set, not evidence
Not enough evidence to simulate
No Biomass yield Y for this organism in the corpus yet.
- Biomass yield Y
2 linked papers report kinetic constants for it; extraction is pending. See its papers
These curves are a Monod and Nernst-Monod idealisation (after Marcus et al. 2007 and Torres et al. 2008), parameterised only by the constants listed above: each one carries its n and its 10–90 % range, and a constant with n = 1 has no spread at all. No diffusion inside the biofilm, no detachment, no coulombic-efficiency split. The scenario values are yours, not evidence.
05 · Performance
Performance
Reported electrochemical output, the role it plays in a reactor, and what it produces.
Role in a reactor
06 · Ecology & biofilm
Ecology & biofilm
How it lives on an electrode, who it partners with, and where it is found in nature.
Ecosystems
- Marine
- Sediment marine
07 · Applications, engineering & safety
Applications, engineering & safety
Where it has been put to work, how tractable it is to engineer, and what handling it requires.
Applications (1)
- Bioelectricity generationTRL 3/9
Biosafety
- Pathogen: no
08 · Sources & data quality
Sources & data quality
Every value above traces to a citation. This is how complete and how confident the record is.
Record quality
Literature reviewed 2026-05-13 · schema v1.3.0 · updated 2026-05-13 · imported 2026-05-13
Open data gaps (1)
- MR-4-specific electrochemical performance is rarely separated from MR-1 in the corpus.
References (1)
- Bretschger O, et al. (2007). Current production and metal oxide reduction by Shewanella oneidensis MR-1 wild type and mutants. Appl Environ Microbiol 73:7003-7012. (Comparative paper that brackets MR-1 vs MR-4 performance.)doi:10.1128/AEM.01087-07