蛋白质定位一信号肽或导肽 a signal peptide is a short (3-60 amino acids long) peptide chain that directs the transport of a protein Signal peptides may also be called targeting signals, signal sequences transit peptides, or localization signals The amino acid sequences of signal peptides direct proteins (which are synthesized in the cytosol)to certain organelles such as the nucleus, mitochondrial matrix, endoplasmi reticulum, chloroplast, apoplast and peroxisome Some signal peptides are cleaved from the protein by signal peptidase after the proteins are transported蛋白质定位---信号肽或导肽 A signal peptide is a short (3-60 amino acids long) peptide chain that directs the transport of a protein. Signal peptides may also be called targeting signals, signal sequences, transit peptides, or localization signals. The amino acid sequences of signal peptides direct proteins (which are synthesized in the cytosol) to certain organelles such as the nucleus, mitochondrial matrix, endoplasmi reticulum, chloroplast, apoplast and peroxisome. Some signal peptides are cleaved from the protein by signal peptidase after the proteins are transported