Related Experiment Video
Updated: May 18, 2026
04:40
Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS)
Published on: July 30, 2020
Tafazzin senses curvature.
1Laboratory of Membrane Biochemistry and Biophysics, National Institute on Alcohol Abuse and Alcoholism, US National Institutes of Health, Bethesda, MD, USA. gawrisch@helix.nih.gov
Nature Chemical Biology
|September 19, 2012
Summary
The enzyme tafazzin enriches mitochondria cardiolipin with specific fatty acids. Its action on curved lipid membranes explains this preference for linoleoyl chains.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Cardiolipin is a vital mitochondrial lipid.
- The enzyme tafazzin modifies cardiolipin composition.
- Tetralinoleoyl-cardiolipin is a major cardiolipin species.
Purpose of the Study:
- To elucidate the molecular mechanism behind tafazzin's specificity for linoleoyl chains in cardiolipin.
- To understand how tafazzin contributes to the unique lipid profile of mitochondria.
Main Methods:
- Lipid monolayer assays were used to study tafazzin activity.
- Analysis of lipid-protein interactions under varying membrane curvature.
Main Results:
- Tafazzin exhibits specific activity on negatively curved lipid monolayers.
- This curvature preference directly correlates with the enrichment of tetralinoleoyl-cardiolipin.
Conclusions:
- The specific action of tafazzin on negatively curved membranes explains its role in cardiolipin enrichment.
- Understanding tafazzin's mechanism provides insights into mitochondrial lipid homeostasis.
Related Concept Videos
01:30Tangent to a Curve
The graph of a function where each output is the square of the input creates a smooth curve that bends upward, becoming steeper as one moves further from the center. At any chosen position along this curve, the curve reaches a certain height depending on the input value. This position can be a reference for analyzing how the curve behaves in its immediate vicinity.To understand the change in the curve near a particular position, imagine selecting another point slightly ahead along the curve.
01:27Curvilinear Motion: Normal and Tangential Components
When a car traverses a curved road, its motion can be elucidated by breaking it down into tangential and normal components. The car-centric coordinates attached to the vehicle move with it.
The positive direction of the t-axis aligns with the increasing position of the car along the curved path, denoted by the unit vector ut. Simultaneously, the n-axis, perpendicular to the t-axis, dissects the curved path into differential arc segments, each forming the arc of a circle with a radius of...
The positive direction of the t-axis aligns with the increasing position of the car along the curved path, denoted by the unit vector ut. Simultaneously, the n-axis, perpendicular to the t-axis, dissects the curved path into differential arc segments, each forming the arc of a circle with a radius of...
01:27Tactile and Chemical Senses
Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...
01:29Sight Distance in a Vertical Curve
Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
01:19Degree of Curvature and Radius of Curvature
The degree of curvature and the radius of curvature are fundamental concepts in determining the sharpness or smoothness of a curve. The degree of curvature is a measure of how steeply a curve bends and can be determined using the chord basis or the arc basis. In the chord basis method, the degree of curvature is defined as the central angle subtended by a chord of 30.48 meters, helping in the calculation of the radius of the curve. The arc basis method defines the degree of curvature as the...
01:16Vertebral Column: Regions and Curvature
The vertebral column or spine is a flexible column that supports the head, neck, and body and allows for their movements. It also protects the spinal cord.
Regions of the Vertebral Column
In an adult, the spine is subdivided into five regions: the cervical, the thoracic, the lumbar, the sacral, and the coccygeal region. The spine initially develops as a series of 33 vertebrae; after 20 years of age, the nine bones in the sacral region, five sacral, and four coccygeal bones fuse to form the...
Regions of the Vertebral Column
In an adult, the spine is subdivided into five regions: the cervical, the thoracic, the lumbar, the sacral, and the coccygeal region. The spine initially develops as a series of 33 vertebrae; after 20 years of age, the nine bones in the sacral region, five sacral, and four coccygeal bones fuse to form the...