Paired Helical Filaments Tau

Paired Helical Filaments Tau

The identification of the molecular properties of paired helical filaments has a less public understanding and fame than amyloid fibril - Scientists are yet to understand the abnormal assembly of filaments within a cell. 

Structures of helical filaments

Studies on the structures of the filament show that paired helical filaments have a double-helical stack with subunits, which have a C-shape. The subunits include:

  • Ubiquitin
  • Vimentin
  • Amyloid proteins
  • Microtubule-associated protein

The intense insolubility of the filament gives it a complicated chemical composition. Further research about the immunohistochemical structure established the varying molecular form of the candidate, with distinctions such as the following:

  • High molecular weight
  • Middle molecular weight

It is hard to distinguish the structural makeup of the filaments under a microscope’s light. The only method is by using a chemical process to identify the ambiguity of the molecules. The breakdown of the components requires an intense biological process.

Placing labels in specific parts, as seen under an electron microscope, allows for purification by the predefined biochemical procedure. Previous processes that have proven to be highly successful use a monoclonal antibody to identify the helical filament. 

The pairing of helical filaments in the absence of a protease treatment display the fuzzy coating. This coating can only undergo removal by pronase, which usually leaves a protease-resistant inner element. The remaining core carries the required morphology of paired helical filaments. 

Established results of sequencing paired helical filaments tau

A few researchers have managed to obtain two different sequences of amino acids from 9.5-kDa. They were a groundbreaking result that forged the way for the cloning and sequencing of cDNAs. These cDNAs encoded the protein of the microtubule. 

Cloning various sequences established that the two amino acid sequences were of one class. Further sequencing specified the proteins to be 383 and 352 amino acids. The differentiation was evident in the presence of an amino-acid insertion. 

The coding of the DNA sequence underlined the different sizes of the amino acids, by separating the long-form from the smaller one. Sequencing the genome clones established that additional repeat as a code by a separate exon. 

The most outstanding quality of the filament’s sequence was the presence of repeats by the tandem, made of at least 31 amino acids. The small proteins have three repeats, while the larger ones have four. The implications of the different number of repeats are yet to become apparent in scientific labs and to bodies like Stress Marq Biosciences. 

Impact of the abnormal folding of paired helical filaments tau

The result of the folding is tangled to the neurofibrillary, which is a critical component of Alzheimer’s disease. The particular anatomy of the pathological changes suggests a continuous spread through an axonal network.

This case was vividly evident after the following procedures:

  • Localization of aggregates
  • Redistribution of vitamens in the immediate filament network
  • Retrograde of the motor protein

Scientists observe that cells internalize PHFs and lead to the creation of bodies that resemble aggresome. The bottom line of the reaction of paired helical filament tau opens avenues to create more effective therapy solutions.


Paired Helical Filaments Tau
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