Related Experiment Video
Updated: Jul 29, 2026
10:06
Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM
Published on: July 10, 2014
Protein biosynthesis during spiny dogfish (Squalus acanthias) enameloid formation
Archives of Oral Biology
|January 1, 1984
Summary
Researchers studied protein biosynthesis in shark tooth development. Ameloblasts secrete key proteins (55 and 43 kd) during enameloid formation, revealing insights into selachian amelogenesis.
Area of Science:
- Developmental Biology
- Biochemistry
- Evolutionary Biology
Background:
- Protein biosynthesis during enameloid formation is poorly understood.
- Selachian amelogenesis offers a model for studying early vertebrate tooth development.
Purpose of the Study:
- To characterize protein biosynthesis during selachian amelogenesis.
- To identify specific proteins synthesized by ameloblasts and odontoblasts.
Main Methods:
- Organ culture of spiny dogfish (Squalus acanthias) tooth organs.
- Pulse/chase experiments using [35S]-methionine labeling.
- Analysis via gel electrophoresis, fluorography, and light microscopic autoradiography.
Main Results:
- Ameloblasts are more biosynthetically active than incipient odontoblasts in early tooth development.
- Two specific polypeptides, 55 kd and 43 kd, are secreted by ameloblasts.
- These proteins are released into the developing tooth extracellular matrix.
Conclusions:
- Ameloblasts play a crucial role in secreting matrix proteins during selachian enameloid formation.
- The identified polypeptides are significant components of the developing enameloid.
- This study provides foundational data on protein synthesis in early vertebrate tooth development.
Related Concept Videos
01:26Protein Modifications in the RER
Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
01:31Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
01:29Bone Formation by Intramembranous Ossification
Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
01:29Amino Acid Biosynthetic Pathways
Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...