Home ← Back to Communities Text Map Taxonomic UMAP Sequence Map Network Schema All Mech projects

E. coli GL10-XL12 D-Lactate Mixed-Sugar SynCom

Community ID CommunityMech:000357
Ecological State ENGINEERED
Environment engineered E. coli mixed-sugar D-lactate fermentation — ontology label: laboratory environment
ENVO:01001405 · HabitatMech ↗

A defined same-species Escherichia coli synthetic consortium in which two BL21 (DE3)-derived knockout strains partition glucose and xylose fermentation for optically pure D-lactate production. GL10 was engineered as the glucose-specialized strain, XL12 was engineered with glk and ptsI deletions to redirect it away from glucose toward xylose, and a 1:1 GL10:XL12 coculture in M9 medium containing 5 g/L glucose plus 5 g/L xylose produced 3.76 g/L D-lactate after 36 h. Agitation and inoculation-ratio perturbations identified a higher 4.53 g/L D-lactate titer at a 1:5 GL10:XL12 ratio, and the same consortium was also tested on detoxified corn straw hydrolysate supplemented into M9 medium.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
Escherichia coli GL10 — ontology label: Escherichia coli NCBITaxon:562 · TaxonMech · TraitMech N/A
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "a glucose-specialized strain, designated GL10, was constructed by deleting pps, poxB, pflB, pta, frdABC, adhE, dld, and mgsA genes"
Escherichia coli XL12 — ontology label: Escherichia coli NCBITaxon:562 · TaxonMech · TraitMech N/A
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "Further knockout of pta, frdABC, adhE, dld, and mgsA in XL5 generated strain XL12"

Ecological Interactions

The graph shows only explicitly linked interaction participants. Community members without an asserted participant link are omitted; membership alone does not imply an interaction.

Ecological interaction network for E. coli GL10-XL12 D-Lactate Mixed-Sugar SynCom Bipartite graph where circles represent taxa and non-circular symbols represent interactions, with distinct shapes and colours for niche partitioning.
Taxon
Niche partitioning

GL10-XL12 glucose-xylose niche partitioning

NICHE_PARTITIONING

GL10 and XL12 show partial, overlapping carbon-source specialization in the tested mixed-glucose/xylose fermentation. GL10 retains xylose metabolism in single-sugar medium, while XL12 still consumes glucose; these are not exclusive substrate users. The 1:1 consortium produced 3.76 g/L D-lactate at 36 h under the baseline conditions. NICHE_PARTITIONING denotes this engineered division of labor, not strain-resolved coculture flux, direct interstrain cross-feeding, partner-dependent growth or universal superiority across shaking speeds and inoculum ratios.

Participating Taxa: Escherichia coli GL10, Escherichia coli XL12

Metabolites: glucose (CHEBI:17234 · MediaIngredientMech · CMMMech), xylose (CHEBI:18222 · MediaIngredientMech · CMMMech), D-lactic acid (CHEBI:42111 · MediaIngredientMech · CMMMech)

Biological Processes:

Evidence

  • PMID:42038008 - SUPPORT (IN_VITRO)
    "A co-culture strategy was implemented to improve metabolic orthogonality toward specific carbon sources within mixed sugars."
  • PMID:42038008 - PARTIAL (IN_VITRO)
    "Microbial consortium using GL10 and XL12 with the inoculation ratio of 1:1 achieved complete glucose depletion and 53.21% xylose utilization simultaneously."
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "In mixed sugar fermentation, the consortium produced 3.76 g/L of D-lactate, achieving a 37.6% conversion yield and a productivity of 0.10 g/L/h"
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "GL10 was not modified to block xylose metabolism"
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "XL12 co-utilized glucose and xylose simultaneously"

Knowledge gaps & discussions (2)

KNOWLEDGE_GAP OPEN Which metabolites, if any, are directly exchanged between E. coli GL10 and E. coli XL12 during mixed-sugar D-lactate fermentation?

The primary article supports carbon-source niche partitioning by glucose- and xylose-specialized E. coli strains, but this curation did not find evidence for a named GL10-to-XL12 or XL12-to-GL10 cross-fed metabolite.

Attaches to: ecological_interactions#GL10-XL12 glucose-xylose niche partitioning

KNOWLEDGE_GAP OPEN Which strain-specific fluxes account for consortium output under each condition?

The two preferred strain labels must remain distinct despite shared NCBITaxon:562. Individual-strain phenotypes and consortium-level HPLC do not resolve each strain's flux during coculture or establish an exchanged metabolite. Keep the existing direct-cross-feeding gap and zero arrows; do not restore the dangling endpoint arrows removed under #826. The abstract and 36 h xylose quantities require reconciliation against unread original supplementary data under #1429, without merging supplement text back into the article cache (#827).

Attaches to: ecological_interactions#GL10-XL12 glucose-xylose niche partitioning

External Resources

Name Repository Resource ID
PubMed - E. coli GL10-XL12 D-lactate SynCom
PubMed record for the Biodesign Research primary article describing the GL10/XL12 E. coli D-lactate SynCom. 		OTHER PMID:42038008
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "Efficient synthesis of optically pure D-lactate from mixed sugars by engineered E. coli consortium."
DOI - E. coli GL10-XL12 D-lactate SynCom
DOI landing page for the Biodesign Research article describing optically pure D-lactate production by GL10 and XL12. 		OTHER doi:10.1016/j.bidere.2026.100072
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "DOI: 10.1016/j.bidere.2026.100072"

Environmental Factors

Factor Value Unit
Mixed glucose-xylose feed 5 g/L glucose and 5 g/L xylose N/A
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "Co-fermentation was performed in M9 medium containing 5 g/L glucose and 5 g/L xylose."
Shaking speed 50, 150, and 250 rpm N/A
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "The incubation was performed at 37 °C and 150 rpm."
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "The fermentation was conducted at two different shaking speeds, including 50 rpm and 250 rpm."
GL10:XL12 inoculation ratio 1:1, 1:5, and 1:15 N/A
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "The initial OD600 was adjust to 0.2, with the inoculation ratio of GL10 and XL12 was 1:1."
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "The fermentation was also tested with the inoculation ratio of GL10 and XL12 at 1:5 and 1:15, respectively."
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "The titer of D-lactate reached 4.53 g/L with a conversion rate of 45.3%, and a production rate of 0.13 g/L/h at an inoculation ratio of 1:5"
Corn straw hydrolysate activated-carbon detoxified hydrolysate in M9 medium, pH 7.0 N/A
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "the pretreated and diluted corn straw hydrolysate was used as the fermentation medium"
  • PMID:42038008 - SUPPORT (IN_VITRO)
    "At 36 h of fermentation, the D-lactate titer reached 5.15 ± 0.22 g/L, which was 41.87% higher than that of WT"

Growth Media

M9 glucose-xylose D-lactate co-fermentation medium

Temperature 37 °C

Composition

Component Concentration Unit CHEBI
glucose · MediaIngredientMech 5 g/L CHEBI:17234
xylose · MediaIngredientMech 5 g/L CHEBI:18222
Na2HPO4 · MediaIngredientMech 6.8 g/L N/A
KH2PO4 · MediaIngredientMech 3.4 g/L N/A
NH4Cl · MediaIngredientMech 1 g/L N/A
NaCl · MediaIngredientMech 0.5 g/L N/A
MgSO4 · MediaIngredientMech 0.24 g/L N/A
CaCl2 · MediaIngredientMech 0.011 g/L N/A

Preparation notes: The consortium was grown in M9 medium containing 5 g/L glucose and 5 g/L xylose from an initial OD600 of 0.2 at a 1:1 GL10:XL12 ratio; the parental E. coli BL21 (DE3) strain was run as the equivalent control.

Evidence

PMID:42038008

"M9 medium consisted of 6.8 g/L Na2HPO4, 3.4 g/L KH2PO4, 1 g/L NH4Cl, 0.5 g/L NaCl to which a 0.24 g/L MgSO4、0.011 g/L CaCl2"

PMID:42038008

"Co-fermentation was performed in M9 medium containing 5 g/L glucose and 5 g/L xylose."

PMID:42038008

"The initial OD600 was adjust to 0.2, with the inoculation ratio of GL10 and XL12 was 1:1."

PMID:42038008

"The incubation was performed at 37 °C and 150 rpm."

Detoxified corn straw hydrolysate M9 medium

pH 7.0

Preparation notes: Corn straw hydrolysate supplied by Wuhan SunHY Biology Co., Ltd. was mixed with powdered activated carbon at 3% w/w, shaken at 50 °C and 220 rpm for 15 h, centrifuged and filtered, supplemented into M9 medium at an appropriate dilution, and adjusted to pH 7.0.

Evidence

PMID:42038008

"To evaluate the production of D-lactate by the bacterial consortium in actual hydrolysate, the pretreated and diluted corn straw hydrolysate was used as the fermentation medium."

PMID:42038008

"The corn straw hydrolysate is provided by Wuhan SunHY Biology Co., Ltd."

PMID:42038008

"the hydrolysate was mixed homogeneously with powdered AC at a ratio of 3% (w/w), followed by incubation with constant temperature shaking at 50 °C and 220 rpm for 15 h."

PMID:42038008

"The hydrolysate was supplemented to M9 medium with an appropriate dilution ( Table S2 ) and the pH was adjusted to 7.0."

Cross-Mech Suite Links

Explore related entities across the CultureBotAI X-Mech knowledge bases:

HabitatMech: engineered E. coli mixed-sugar D-lactate fermentation ↗ TaxonMech: Escherichia coli GL10 ↗ TraitMech: Escherichia coli GL10 ↗ TaxonMech: Escherichia coli XL12 ↗ TraitMech: Escherichia coli XL12 ↗ CultureMech Growth Media ↗ PathwayMech Pathways ↗