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404 Cell-Penetrating Peptides: Processes and Applications<br />
FtsY-dependent, 301<br />
secA-dependent, 299<br />
secB-dependent, 298–299<br />
SecYEG and related protein-dependent,<br />
300<br />
SRP-dependent, 300<br />
Tat-dependent, 301–302<br />
unknown or factor-independent, 302–303<br />
energetic aspects, 302–303<br />
insertion of procoat proteins, 302<br />
eukaryotic secretion pathways, 303–305<br />
cotranslational, 303–304<br />
targeting to ER, 303–304<br />
translocon complex, 304<br />
post-translational, 304–305<br />
chaperone proteins, 305<br />
membrane proteins in addition to Sec,<br />
304–305<br />
historical considerations, 296–297<br />
predictive and proteome analyses, 310–313<br />
artificial neural network–based methods,<br />
311–312<br />
global structure–based methods, 312–313<br />
prediction algorithms, 310<br />
from proteome to secretome, 313<br />
weight matrix methods, 311<br />
sequence features and specificity, 305–310<br />
determinants of specificity, 308–310<br />
eubacterial signal peptides, 308–309<br />
eukaryotic signal peptides, 309–310<br />
general features, 305–306<br />
signal anchors, 306<br />
tripartite structure, 305<br />
signal peptidases, 306–308<br />
PiHD (XcpA), 307<br />
type I<br />
distribution, 306<br />
specificity, 307<br />
type II, 307<br />
Signal recognition particles (SRPs), 297, see also<br />
Signal peptides<br />
Signal sequence-based CPPs, 93–113<br />
design and evaluation, 105–108<br />
cell delivery mechanism, 105–106<br />
nuclear transport mechanism, 106–108<br />
as gene delivery vectors, 102–105<br />
challenges in gene delivery, 102<br />
covalent linkage to condensing agents,<br />
104<br />
direct linkage to DNA, 104–105<br />
noncovalent incorporation of NLS,<br />
102–103<br />
NLS-containing CPPs, 99–102<br />
applications, 100–102<br />
import signal sequences, 99–100<br />
nuclear localization sequence (NLS)<br />
in active cargo delivery, 97–98<br />
principles, 94–95<br />
transport mechanism, 95–97<br />
Single time point experiments, 283–284<br />
SIV fusion peptide, 202–204<br />
Small unicellular vesicles (SUVs), 227<br />
SN50 peptide, 118–119<br />
Solution phase conjugation, 332–336<br />
amine-reactive reagents, 332–333<br />
example: superparamagnetic iron oxide<br />
particle–Tat conjugate, 334–336<br />
heterobifunctional conjugation, 333–334<br />
sulfhydryl-reactive reagents, 333<br />
Solvent mixtures, 228–229<br />
Specificity<br />
determinants of, 308–310<br />
eubacterial signal peptides, 308–309<br />
eukaryotic signal peptides, 309–310<br />
sequence features and, 305–310<br />
general features, 305–306<br />
signal anchors, 306<br />
tripartite structure, 305<br />
signal peptidases, 306–308<br />
PiHD (XcpA), 307<br />
type I<br />
distribution, 306<br />
specificity, 307<br />
type II, 307<br />
Spectrometry, quantification by, 267–269<br />
Spectroscopy<br />
circular dichroism, 167, 232, 235<br />
electron paramagnetic resonance (EPR), 177,<br />
233<br />
Fourier transform infrared, 167–168, 232<br />
transverse relaxation optimized (TROSY), 235<br />
SR-α, 301<br />
7S RNA, 303<br />
SRP-dependent bacterial protein secretion<br />
pathways, 300<br />
STAT1 transcription factor, 118<br />
Stern layer, 229–230<br />
Stretavidin, transportan and, 64–66<br />
Structural organization, of transportans, 67–69<br />
Structure–activity relationships, of transportans,<br />
58–59<br />
Structure prediction modeling, 187–222<br />
conclusions, 215–218<br />
methods, 190–202<br />
atomic surface hydrophobicity (first<br />
restraint), 191–193<br />
charge simulation (third restraint),<br />
194–197<br />
description of water–bilayer interface,<br />
190–191