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Related Concept Videos

Frames01:30

Frames

Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
Frames: Problem Solving I01:24

Frames: Problem Solving I

Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
Frames: Problem Solving II01:26

Frames: Problem Solving II

Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
Design Consideration01:22

Design Consideration

Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key aspect...
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and stress...
Posttensioned Masonry Walls01:15

Posttensioned Masonry Walls


Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...

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Related Experiment Video

Updated: Jul 13, 2026

Rapid Verification of Terminators Using the pGR-Blue Plasmid and Golden Gate Assembly
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Enhanced Golden Gate Assembly: evaluating overhang strength for improved ligation efficiency.

Patryk Strzelecki1,2, Nicolas Joly3, Pascal Hébraud1

  • 1Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS UMR 7504, Université de Strasbourg, 23, rue du Loess, 67000 Strasbourg, France.

Nucleic Acids Research
|September 28, 2024
PubMed
Summary

Golden Gate Assembly (GGA) uses type IIS enzymes for efficient molecular cloning. This study shows strong DNA overhangs enhance GGA efficiency, contrary to previous hypotheses, optimizing complex DNA assembly.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Biotechnology

Background:

  • Molecular cloning relies on efficient ligation, with Golden Gate Assembly (GGA) offering significant improvements.
  • Type IIS enzymes are crucial for GGA, cleaving DNA to create specific overhangs for assembly.
  • Recent advancements include engineered enzymes and high-throughput assays for optimizing GGA.

Purpose of the Study:

  • To investigate the relationship between DNA overhang stability and ligation efficiency in Golden Gate Assembly.
  • To test the hypothesis that strong overhangs hinder ligation by promoting re-ligation of hydrolyzed fragments.
  • To identify optimal overhangs for enhanced efficiency and yield in complex DNA assemblies.

Main Methods:

  • Utilized gel electrophoresis to analyze DNA fragment ligation.
  • Employed numerical calculations to model and understand ligation kinetics.
  • Performed multi-fragment (10-fragment) Golden Gate Assembly assays.

Main Results:

  • The hypothesis that strong overhangs slow down ligation was disproven under standard GGA conditions.
  • Stronger DNA overhangs directly correlated with higher Golden Gate Assembly efficiency.
  • Weaker overhangs resulted in decreased Golden Gate Assembly efficiency.

Conclusions:

  • Overhang stability is a critical determinant of Golden Gate Assembly efficiency.
  • Strong overhangs are beneficial for maximizing yield in complex DNA assembly.
  • These findings provide a basis for designing optimal overhangs to improve GGA protocols.