多肽合成中困难序列的缩合研究进展(4)
发布时间:2021-06-08
发布时间:2021-06-08
非常详细的综述性文章
114
药学学报Acta
PharmaceuticaSinica
2007,42(2):111—117
m。◆面O-…-,'-N
1
N
r∞还。凸N'M"几“
H
8。
~?。彳七峨卓名HBTU-M_/DIP。E:
Pipridine/DMF/H202.TFAcleavage
R=p-OCH3(Hmb),m-N02(2.5-Hnb)oro-N02洲nb)
Figure4
ProposedreactionmechanismfortheacylationreactionwiththeHnbN—auxiliary
depsipeptideisrearrangedyieldingthedesiredpeptidebymildbaseaftercleavagefromtheresin[19,2….4
Sequence-assistedpeptideThe
attachment
of
spacer
noticeable“difficuhsequences”thesynthesis
ofH一
(Thr—Val);一OHandH.Val—Ash—Val.Asn.Val—G1n—Val一
Gin—Val—Asp—OH,theAcytCarrierProtein(65—74)
the
andthehumaninsulinB—chainhavebeeninvestigated.Inall
cases
synthesis(SAPS)
units
to
increase
distancefromthepeptide,cantion,known
also
resin
beforesynthesis
ofthe
target
introductionof
a
pre—sequencegivesrise
to
reducethe
peptide—chainaggrega—
satisfactoryresults.Inthe
sequence
lattercase.thelysinepre-
to
as“sequence—assistedpeptide
a
synthesis
couldbeinsulin
cleavedenzymatically
NIR—FT
give
the
(SAPS)”.During
using
studyofsuch“difficultsequences”
strategy,DueLarsenB
aggregation
may
E21。
desB30
B—chain.
rnear—infr ared
theFmoc—protection
that
Fourier—transform)Ramananalysisduringthesvnthesl‘s
of
hasobserved
peptide—chain
when
be
the(Ala)。,the
conformationshiftsofthegrowing
pre—sequencefromcoll
was
a
significantly
sequences
reduced
are
certain
aminoacid
peptidechain
with[Lys(Boc)]6
a
incorporatedC—terminally.Thus,
卢一structure(n≥6)to
that
SPPS
randomobserved.
synthesisofthedifficult
poly—alanine,(Ala)n,(n≤with[Lys(Boc)]。(m≤6)
Thisresultisinagreementwiththegeneralobservation
proceeds
optimally
under
random
coil
20)hasbeeninvestigated
and[Glu(tBu)]。。(m≥6)aspre—sequences.With
m/>3,peptidesproductswhileand
a
are
conditions.5
TheeffectofmixedsolventIt
peptide
iS
not
new
obtained
as
single,homogeneousofdeletionpeptidespeptides
is
complexmixtureFmoc—protected
using
mixed
solventto
improve
to
pay
corresponding
formed
pre—
solubility㈦2“.However.it
use
remainsfor
(n≥6)withoutthe
pre—sequence.A
mixed
a
greatattentiontohydrogen
bond
of
mixedsolventaggregationdestroying
peptide
sequence,[Lys(Boc)Glu(tBu)]3,has
favorableeffect
on
similarother
andthe
between
the
results.Some