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In: Biology

Start transfer sequences in newly synthesized proteins are required for translocation of proteins into the nucleus...

Start transfer sequences in newly synthesized proteins are required for translocation of proteins into the nucleus across the NPC (T/F)

Solutions

Expert Solution

Synthesis of proteins begins in cytosol.Newly synthesized proteins enters the endoplasmic reticulum(ER) and then it moves to Golgi apparatus and then secretory or lysosomal pathway.During translation these proteins enters the ER with a presence of a signal sequence that is hydrophobic with 20-30 amino acids which is located in N terminus.This signal sequence combines with Signal recognition particle or SRP to help protein pass through luminal surface of ER.The SRP stops any further translation process until this binding process.The proteins that needs to translocate to the nucleus needs additional sequences like start and stop transfer sequences.The start transfer sequence helps newly synthesized proteins to translocate through nucleus across the Nuclear pore complex(NPC).These sequences located internally and not in N terminus also can bind to the SRP and initiates translocation.But they are not cleaved after the translocation.Start transfer sequences in newly synthesized proteins are required for translocation of proteins into the nucleus across the NPC is a True statement.


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