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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

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