Transcription to protein targeting

Transcription to protein targeting


with computer animation we can enter the cell to view this remarkable system at work after entering the heart of the cell we see that tightly wound strands of DNA storehouses for the instructions necessary to build every protein in an organism in a process known as transcription a molecular machine first unwinds a section of the DNA helix to expose the genetic instructions needed to assemble a specific protein molecule another machine then copies these instructions to form a molecule known as messenger RNA when transcription is complete the slender RNA strand carries the genetic information through the nuclear pore complex the gatekeeper for traffic in and out of the cell nucleus the messenger RNA strand is directed to a two-part molecular factory called a ribosome after attaching itself securely the process of translation begins inside the ribosome a molecular assembly line builds a specifically sequenced chain of amino acids these amino acids are transported from other parts of the cell and then linked into chains often hundreds of units long they’re sequential arrangement determines the type of protein manufactured when the chain is finished it is moved from the ribosome to a barrel-shaped machine that helps fold it into the precise shape critical to its function after the train is folded into a protein it is then released and shepherded by another molecular machine to the exact location where it is needed

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