What is trehalase?
Trehalase hydrolyses trehalose, a disaccharide used in stress protection and carbon storage across many organisms. Its specific recognition makes it useful for trehalose metabolism and analysis.
Trehalase hydrolyses trehalose; it is not trehalose synthase or trehalose phosphorylase. These enzymes perform different reactions.
The key idea
Trehalose joins two anomeric carbons; recognising that linkage explains its distinction from maltose.
[3]
Core properties and EC classification
An EC number classifies a catalysed reaction. It does not specify a production strain, amino-acid sequence, preparation purity or operating optimum. Related proteins can perform the same classified reaction, while a commercial activity name may cover several reactions.
· Classification · Accepted activity · Reaction scope
· EC 3.2.1.28 · α,α-trehalase · α,α-trehalose + H 2 O = β- D -glucose + α- D -glucose
· Substrate / system · Chemical distinction · Practical interpretation
· Trehalose · α,α-1,1 linkage · Trehalase substrate
· Maltose · α-1,4 linkage · Different disaccharide specificity
· Glucose readout · Product detection · Requires correction for pre-existing glucose
[3]
Molecular weight: monomer, dimer or multimer?
A monomer contains one protein subunit; a homodimer contains two copies of the same subunit, and a higher oligomer contains more. A protein domain is a region within a chain, not an additional subunit. Likewise, mixing enzymes in a bottle does not establish that they form a stable molecular complex.
· Property of the named example · Evidence and interpretation
· Molecular weight of the example · Approximately 61.2 kDa for the deposited protein entity (one polypeptide; PDB 2JF4). This is not whole-formulation mass or a measured glycosylated mass.
· Monomer, dimer or multimer? · Monomer, as annotated for PDB 2JF4 biological assembly 1. UniProt P13482 describes the protein as: Monomer.
· Model and experimental resolution · PDB 2JF4; 2.2 Å X-ray diffraction; representative chain A.
· Deposited protein sequence · 535 residues in the experimental entity; unresolved coordinates and biological processing are separate considerations.
The mass above is the deposited polypeptide-entity value. Glycosylation, precursor processing, linkers or omitted domains can change the experimentally observed mass. SDS–PAGE primarily informs denatured subunit size; native assembly needs evidence such as SEC–MALS, analytical ultracentrifugation or an appropriate structural analysis. The viewer shows one selected chain for clarity, not necessarily the complete biological assembly.
[1][2]
FROM MOLECULE TO APPLICATIONTrehalose joins two anomeric carbons; recognising that linkage explains its distinction from maltose.
Natural sources and fermentation hosts
Trehalases occur in bacteria, fungi, plants and animals. The structural example is a periplasmic E. coli trehalase; other organisms contain cytosolic or differently regulated forms.
Microbial fermentation and recombinant expression can supply trehalase preparations. There is no single universal commercial host; the selected gene and intended assay determine the production route.
· Term · What it means in this report
· Natural donor of the model · Escherichia coli — the organism associated with the displayed protein sequence.
· Expression host of the structural sample · ESCHERICHIA COLI
· Manufacturing route · Microbial fermentation and recombinant expression can supply trehalase preparations. There is no single universal commercial host; the selected gene and intended assay determine the production route.
· Supplied product · Use the linked product documentation for the actual grade, activity assay and declared source. A structural example does not establish the manufacturing organism or purity of the supplied preparation.
[1]
Reaction mechanism and structure–function relationships
Trehalose links two glucose anomeric centres through an α,α-1,1 bond. GH37 trehalases use an inverting hydrolytic mechanism with catalytic acid–base residues. The E. coli structure shown here includes a potent inhibitor and helps explain recognition of this unusual disaccharide linkage. Inhibitor-bound coordinates are a captured state, not a movie of catalysis.
THE REACTION, STEP BY STEP
1
Bind α,α-trehalose in the active site
2
Hydrolyse the α,α-1,1 linkage
3
Release two glucose molecules
Trehalose + water→Two glucose molecules
Conceptual reaction pathway; the stages describe function rather than atomic geometry.
From active-site chemistry to a useful process
Trehalose joins two anomeric carbons; recognising that linkage explains its distinction from maltose. Use a defined trehalose standard beside the actual sample and include a glucose-background blank. Confirm that the analytical method and sample-stopping step work before attributing a low signal to enzyme inactivity.
The catalytic mechanism explains which chemical transformation is possible. It does not, by itself, establish the rate in a complex material. Substrate presentation, reaction-medium composition and retention of the active fold determine whether that chemistry can proceed usefully under the chosen conditions. This is why a defined-substrate activity measurement and an application trial provide complementary evidence.
[2][3]
Discovery and scientific milestones
Discovery, purification, structural characterisation and industrial adoption are different historical milestones. The named studies below identify specific contributions; a publication date is not automatically the first discovery of every activity covered by the enzyme name.
1937
Biochemical and historical context
Myrbäck and Örtenblad studied yeast trehalase activity in 1937. Kalf and Rieder reported preparation and properties of trehalase in 1958.
[3]2007
Gibson and colleagues: molecular characterisation
The primary study associated with PDB 2JF4 is “Molecular Basis for Trehalase Inhibition Revealed by the Structure of Trehalase in Complex with Potent Inhibitors.”. The experimental structure links the named protein to a concrete molecular model, allowing its fold, substrate-binding region and assembly to be examined rather than inferred from the general enzyme name.
[2]
Major industrial applications and research uses
Research studies trehalose mobilisation and stress responses. Analytical workflows can quantify trehalose by controlled conversion to glucose. Industrial investigations assess carbohydrate conversion where trehalose is a relevant feedstock component.
01
Trehalose analysis
Convert trehalose into measurable glucose.
Measure success: Use blank correction and validated conversion.
02
Carbohydrate processing
Investigate trehalose-containing feedstocks.
Measure success: Measure both substrate disappearance and glucose formation.
03
Biological research
Study trehalose mobilisation.
Measure success: Distinguish purified enzyme behaviour from cellular regulation.
A research use, a development-stage process and an established commercial application do not imply the same level of readiness. Match the preparation to the target matrix and required grade, then validate the specific outcome described above. The product links below provide the route from this scientific overview to a defined supplied formulation.
Activity assays and interpreting experimental results
Use a glucose-specific endpoint with a starting-glucose blank. Because one trehalose molecule yields two glucose molecules, stoichiometry matters in calibration. Verify that other glucose-releasing activities are absent when analysing mixtures.
A useful experiment for this enzyme
Use a defined trehalose standard beside the actual sample and include a glucose-background blank. Confirm that the analytical method and sample-stopping step work before attributing a low signal to enzyme inactivity.
· Experimental question · Evidence to collect
· Is the enzyme active? · Measure an initial rate with a defined substrate, blank correction and a stated activity-unit definition.
· Does it work on this material? · Use blank correction and validated conversion.
· Is the preparation stable? · Measure residual activity after a specified exposure, separately from activity during the exposure.
· Is the product what you intended? · Measure both substrate disappearance and glucose formation.
Keep enzyme loading, substrate amount, mixing, temperature and sampling time explicit. Use a no-enzyme control to capture non-enzymatic changes and a suitable analytical blank for colour, background sugars, peptides or other interfering components. A time course is more informative than one endpoint when the reaction slows, because substrate depletion, loss of activity and product effects can produce similar plateaus.
Reading kinetic and operating data
Compare reported pH and temperature optima only when substrate and assay duration are comparable. An optimum describes the measured rate within an experiment; it is not a guarantee of long-incubation stability. For heterogeneous substrates, changes in accessibility can also affect apparent kinetic behaviour. Cite the protein, substrate and conditions alongside any kinetic constant rather than treating it as a universal property of the enzyme name.
[3]
Common questions
How many glucose molecules arise from one trehalose?
Complete hydrolysis gives two glucose molecules.
Does failure on trehalose mean the stated units are false?
First compare the unit assay, matrix and conditions with the experiment; they may differ.
Does the inhibitor-bound structure show normal turnover?
It is a captured inhibited state that informs recognition, not a direct time-resolved reaction.
Continue exploring
Trehalase Not Working? Trehalose Access, Assays and Glucose Release ↗Lactase deep dive ↗Alpha-galactosidase deep dive ↗Invertase deep dive ↗
