Toolkit/DuCV-1 NLS-deleted dCap construct

DuCV-1 NLS-deleted dCap construct

Construct Pattern·Research·Since 2026

Also known as: dCap, NLS-deleted dCap (residues 1-36), putative NLS-deleted dCap

Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.

Summary

Codon-optimized full-length Cap and putative NLS-deleted dCap (residues 1-36) were expressed in Escherichia coli. Deletion of the putative NLS reduced Cap expression by 50%, solubility from 88% to 32.6%, and completely abolished VLP assembly.

Usefulness & Problems

Why this is useful

This deletion construct removes the putative NLS region from the DuCV-1 capsid protein to test its contribution to protein behavior and particle assembly. In the reported system, it fails to support VLP assembly.; testing the functional role of the putative NLS in Cap expression, solubility, and assembly

Source:

This deletion construct removes the putative NLS region from the DuCV-1 capsid protein to test its contribution to protein behavior and particle assembly. In the reported system, it fails to support VLP assembly.

Source:

testing the functional role of the putative NLS in Cap expression, solubility, and assembly

Problem solved

It isolates the contribution of the putative NLS to expression, solubility, folding, and assembly by comparison with full-length Cap.; provides a deletion construct to probe whether the N-terminal putative NLS is required for VLP assembly

Source:

It isolates the contribution of the putative NLS to expression, solubility, folding, and assembly by comparison with full-length Cap.

Source:

provides a deletion construct to probe whether the N-terminal putative NLS is required for VLP assembly

Problem links

provides a deletion construct to probe whether the N-terminal putative NLS is required for VLP assembly

Literature

It isolates the contribution of the putative NLS to expression, solubility, folding, and assembly by comparison with full-length Cap.

Source:

It isolates the contribution of the putative NLS to expression, solubility, folding, and assembly by comparison with full-length Cap.

Published Workflows

Research note: the putative nuclear localization signal of duck circovirus type 1 cap protein is critical for VLP assembly.

2026

Objective: Establish a prokaryotic expression system for DuCV-1 virus-like particles and determine whether the putative NLS of Cap is required for protein function and assembly.

Why it works: The workflow compares full-length Cap with an NLS-deleted variant in the same bacterial expression context, then links observed expression, solubility, and assembly differences to a structural model of the capsid.

role of the putative NLS in Cap foldingrole of the putative NLS in inter-subunit interactions at the 2-fold axisrole of the putative NLS in VLP assemblyprokaryotic expression in Escherichia colicomparative analysis of full-length and NLS-deleted constructshomology modeling

Stages

  1. 1.
    Construct expression in Escherichia coli(library_build)

    This stage establishes the bacterial production system needed to test whether the putative NLS affects Cap behavior.

    Selection: Generate comparable full-length and NLS-deleted Cap proteins in a prokaryotic system.

  2. 2.
    Comparative functional characterization of expression, solubility, and assembly(functional_characterization)

    This stage tests whether the putative NLS is required for productive capsid behavior rather than merely present in the sequence.

    Selection: Determine how NLS deletion changes expression, solubility, and VLP assembly relative to full-length Cap.

  3. 3.
    Structural interpretation by homology modeling(secondary_characterization)

    This stage provides a mechanistic rationale for why the putative NLS affects folding and assembly.

    Selection: Interpret the structural basis for the assembly phenotype associated with the putative NLS.

Steps

  1. 1.
    Express codon-optimized full-length Cap and NLS-deleted dCap in Escherichia coliengineered comparison constructs

    Create matched constructs for testing whether the putative NLS is required for productive Cap behavior in a prokaryotic system.

    Expression in the same bacterial host is needed before comparing solubility and assembly outcomes between full-length and NLS-deleted constructs.

  2. 2.
    Compare expression and solubility of full-length Cap versus dCapcomparison constructs

    Measure whether deleting the putative NLS changes protein yield and solubility before assessing assembly competence.

    Expression and solubility differences can explain or contextualize downstream assembly failure.

  3. 3.
    Assess VLP assembly of full-length Cap and dCapassembly test constructs

    Determine whether the putative NLS is required for self-assembly into DuCV-1 VLP.

    After establishing that both constructs are expressed, assembly testing directly addresses the study objective of VLP formation and NLS function.

  4. 4.
    Use homology modeling to interpret the structural role of the putative NLS

    Explain the observed assembly phenotype by locating how the putative NLS contributes to capsid structure.

    Structural modeling is used after the experimental comparison to rationalize why NLS deletion disrupts folding and assembly.

Taxonomy & Function

Primary hierarchy

Mechanism Branch

Architecture: A reusable architecture pattern for arranging parts into an engineered system.

Techniques

No technique tags yet.

Target processes

No target processes tagged yet.

Implementation Constraints

cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: actuator

The abstract supports expression in Escherichia coli of a codon-optimized NLS-deleted capsid construct lacking residues 1-36. No other build details are given in the provided evidence.; deletes residues 1-36 corresponding to the putative NLS; expressed in Escherichia coli

It does not provide a productive VLP assembly construct in this study, because assembly was completely abolished.; reduced expression by 50%; reduced solubility from 88% to 32.6%; completely abolished VLP assembly

Validation

Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication

Observations

failedBacteriafailed attemptEscherichia coli

Inferred from claim cl3 during normalization. Deletion of the putative NLS reduced Cap expression by 50%, reduced solubility from 88% to 32.6%, and abolished VLP assembly. Derived from claim cl3. Quoted text: Deletion of the putative NLS reduced Cap expression by 50%, solubility from 88% to 32.6%, and completely abolished VLP assembly.

Source:

expression reduction50 %solubility88 %solubility32.6 %

Supporting Sources

Ranked Claims

Claim 1assembly resultsupports2026Source 1needs review

Full-length DuCV-1 Cap self-assembled into 13-17 nm icosahedral VLP structurally consistent with native virions.

Full-length Cap self-assembled into 13-17 nm icosahedral VLP, structurally consistent with native virions.
VLP diameter 13-17 nm
Claim 2comparative construct effectsupports2026Source 1needs review

Deletion of the putative NLS reduced Cap expression by 50%, reduced solubility from 88% to 32.6%, and abolished VLP assembly.

Deletion of the putative NLS reduced Cap expression by 50%, solubility from 88% to 32.6%, and completely abolished VLP assembly.
expression reduction 50 %solubility 88 %solubility 32.6 %
Claim 3engineering outcomesupports2026Source 1needs review

A prokaryotic expression system for DuCV-1 VLP was established using codon-optimized full-length Cap expressed in Escherichia coli.

This study aimed to establish a prokaryotic expression system for DuCV-1 virus-like particle (VLP)... Codon-optimized full-length Cap ... were expressed in Escherichia coli.

Approval Evidence

1 source1 linked approval claimfirst-pass slug ducv-1-nls-deleted-dcap-construct
Codon-optimized full-length Cap and putative NLS-deleted dCap (residues 1-36) were expressed in Escherichia coli. Deletion of the putative NLS reduced Cap expression by 50%, solubility from 88% to 32.6%, and completely abolished VLP assembly.

Source:

comparative construct effectsupports

Deletion of the putative NLS reduced Cap expression by 50%, reduced solubility from 88% to 32.6%, and abolished VLP assembly.

Deletion of the putative NLS reduced Cap expression by 50%, solubility from 88% to 32.6%, and completely abolished VLP assembly.

Source:

Comparisons

Source-stated alternatives

The source directly contrasts dCap with the full-length Cap construct, which retains the putative NLS and self-assembles into VLP.

Source:

The source directly contrasts dCap with the full-length Cap construct, which retains the putative NLS and self-assembles into VLP.

Source-backed strengths

enables direct functional comparison against full-length Cap

Source:

enables direct functional comparison against full-length Cap

Compared with DuCV-1 full-length Cap virus-like particle expression construct

The source directly contrasts dCap with the full-length Cap construct, which retains the putative NLS and self-assembles into VLP.

Shared frame: source-stated alternative in extracted literature

Strengths here: enables direct functional comparison against full-length Cap.

Relative tradeoffs: reduced expression by 50%; reduced solubility from 88% to 32.6%; completely abolished VLP assembly.

Source:

The source directly contrasts dCap with the full-length Cap construct, which retains the putative NLS and self-assembles into VLP.

Ranked Citations

  1. 1.
    StructuralSource 1MED2026Claim 1Claim 2Claim 3

    Extracted from this source document.