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ChineseJournalofBioprocessEngineering
Vol.11No.1
Jan.2013
doi:10.3969/j.issn.1672-3678.2013.01.013
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:2012-11-07
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,Email:jianhexu@ecust.edu.cn
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168
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JOPI
:1672-3678(2013)01-0070-08
Comparativeevaluationofsevenrecombinantesterhydrolases
fromBacilussubtilis168usingstructuralydiversepnitrophenyl
carboxylatesandacetylatedalcohols
LIUJiayan,QIANLe,ZHENGGaowei,XUJianhe
(StateKeyLaboratoryofBioreactorEngineering,EastChinaUniversityofScienceandTechnology,Shanghai200237,China)
Abstract:ThirtyputativehydrolasegenesfromBacilussubtilis168wereclonedandexpressedbasedon
thepublishedgenomicinformationinGenBank.Sevenenzymesshowedsignificantlipolyticactivities
towardspnitrophenylesters.Phylogeneticanalysisrevealedthattheseenzymesbelongtofivesubfamilies
ofα/βhydrolasefamily.HighthroughputscreeningmethodsinvolvingchromogenicsubstratesandpH
indictorwereusedtoobtainactivityfingerprintoftheseenzymestowardsestersofcarboxylicacidsand
acetatesofalcohols.Theenantioselectivityoftheseenzymestowardsvariouschiralsubstrateswasalso
investigatedandcompared.ItwasshownthattheesterasePnbA(aparanitrobenzylesterase)andCah
(anSdeacylase)acceptedabroaderrangeofacetylestersofalcoholsthantheothers.TheenzymesPnbA
andNap(carboxylesteraseNP)exhibitedexcelentenantioselectivity(E>200)inhydrolysisofdl
menthylacetate2chloro1phenethylacetateand2naphthylethylacetate.Moreover,anovelenzymeYitV
wasactedasanantiKazlauskascatalystinhydrolyzing2chloro1phenylethylacetatewithmoderate
enantioselectivity.
Keywords:activityfingerprint;genomeofBacilussubtilis;highthroughputassay;hydrolasefamily;lipase
^Â`&STÀïàOµzZ!8B
¯ó&
,
Å»¿÷»2
[1]。
/<=ó&0
¨ùrê`øeÈ
,
ìÓ\#Ìud
º`Ô+#ÍÎÎ
[2-4]。
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ù½Æ
1997
$pæÅV
[5],30
"0¨eÏ
òºÖx|Ô
,
dçÔæÅe²ÙÇ.
,
í¡
LipA
Ç
LipB[6-9]。
.î
,
Î=
B.subtilisThai
I 8`
â,-Ô
NP(
æ
nap
0¨ab
)
æeij®
¯«ÇßXÈn
[10]。
Ô
YbfK(
æ
ybfK
0¨a
b
),
eèéºSTx|îý`
IPG(1,2O
isopropylideneglycerol)
P,-&
e.e.
ªÖ
999%
`
(S) IPG[11-12]。
Î=)%
NRRLB8079
`K0i0-ÔW
1995
$R%e·
¸
、
.ìÇ.
[12-13]。
)%
DSM402
0
¨ÚÖ
yvak`
-ÔWe4/ºSTx|
1
LNY
N,-÷:`©àáR
(E>150)[14]。
)%
ECU0554
`-Ժ:ܳ
(1mol/L)
DST®¯WXY
,
ÿ:`©à
áR
(E>200),
e·¸.ìjR%
[15-16]。
>u
,
)%¡ùÏx|Ô`RxÇ
º>e23èé
。
ÉJD%)%
168`
0¨ùs
OP
,
Jð4/hid2`x|Ô
。
Â)Õ
.ì§
7
"þë-x|12`)%
-Ô
,
ø0,½¯¨.þ
,
d¯qÅj
5
"Ú
¾`[-v
,
^Ï9R
。
ò=µ*:µ^`
O¯q23dá¿Ï9`,ÇY`Üã
RÇÏ9R
,
))t¦ÐQR-x|
`©àáR
。
1
QRSTU
1.1
c(
)%
(B.subtilis168)
æ?"|&
&o23*DÊ23üÂÃ
。
R%
E.coli
DH5αij·¸ìÓ,E.coliBL21(DE3)ij.ù
Ô`.ì
,
ËÖÂìÓ\
。
1.2
%
LB
`a0
(g/L):NaCl10,
efg
10,
hi
5;
j
121℃
:/½%
20min。
=FC`a0
(g/L):
efg
10,
hi
5,
Na2HPO4895,KH2PO434,NH4Cl267,Na2SO4
071,MgSO4024,SA 5,bcd 05,md 2;j
115℃
:/½%
30min。
1.3
|45©ª§¨
)%
168
30
"ÏÖx|Ô`0
¨eûd·¸
[5],
Å*
PCR
enÔxÔòj.ì
ß
pET 28a,
VTÌh´
E.coliBL21(DE3)
s.ù.ì
。
*.ùÄ
LB
`a0`a{Ä~
(37℃),
=FC`a0
[17]
`a
20h(25℃)。
º)Å
(6500r/min10min)
³;n
,
iË,Ì
ÍÎ~ÅÆ
2
É
(01mol/L,pH70),
!ÈÉÊ
。
p
SDS PAGE
0¨`.ì
,
i
Bradford
åef³
。
ÉÊn`tÔ~$Çnj
4℃
±i
。
1.4
4uþ
.ùÔÔ12åÊË3
[18]。
Ô1(Ñ
(U)
ÙÒÖå56DÓ¯Ôw&
10μmol
K0LM*«`Ô^
。
1.5
}~1
1.5.1
ÔK0LMâ,-`ÜãR
ùiK0LM-Ôx|&æ§`K
0LM
[19]
å-Ô`12
,
*iÜá¿Ï9
R
(
ð
1)。
ì°Üi~
,
Ü{jYZ0[(DMSO),
³Ö
1mmol/L。
hßÁÖ
:
Ô{~
10μL,Üi~50μLÇKPBÍÎ~140μL(100
mmol/L,pH70)。
zpt{~ø(s
96
ºüÝ
sÔä
,30℃
¦«
10s
n
,
404nm
DÓÖ
20s
å
1
ÉÆɪ
,
¥
10min。
1.5.2
ÔÚ¾YN,-`ÜãR
:iK0LMÕÖ
pH
`-À
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åN,-
Ôx|*&`N,^
[20],
*iåÜ(ð
2。
å~ù
:30mmol/L
Ü
/
NX{~
420μL,
NX
470μL,1mmol/LK0LM{~6mL({j
50mmol/LBES
ÍÎ~
,pH72),
pq
50mmol/L
N,N
ú
(2
N0
) 2
ø0Ny,
BES
ÍÎ~
(pH72)511mL。
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5
Ç
100μLtuå
~"(s
96
ºÔü
,
ÝsÔäå
。
25
℃
¦«
10s,
Ó
30s
å
404nm
Æɪ
,
¥
10
min,
ß6®(
(1)。
N,&°
(μmol·min-1)=
dA
dt×
cB
cin
× 1
Δε404l
V×106 (1)
17
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1
#
K*|â
:
ùiá¿Ï9R`K0LMâ,-ÇÒÓYN,-ÒÌ
7
")%-x|Ô``ÄðÝ
:dA/dt
ZÓ¯Ô
404nm
Æɪ`+T
ª
,cBZÍÎ~³(mol/L),cinZ`-ÀK0L
M`³
(mol/L),Δε404Z pH`-ÀK0LM
`xÄTÇ«xÄT
2
{á¿`ÉÁrc¥
(17300mol-1·L·cm-1),l
ZÉ+
(
Ôü
105
μL~ß`É+Ö0306cm),VÖhß。
G
1
A«§Inc|42315XÊo@1ty%z{|
Fig.1 StructureofpnitrophenylestersusedforprofilingsubstratespecificityofBacilussubtilisesterases(BSEs)
G
2
AǤInc|4}~15<|
Fig.2 AcetylestersofalcoholsforfingerprintingsubstratespecificityofBSEs
1.6
4»ùú1}~5t/01
h~T
10mmol/L
Ü
(
ð
3)
ÇÔ{~
,
h56(.
1。
hJ9iN,N-;Coñò
Câ¦
,
Çons:~¦§Ý
(HPLC)
oz
¦§Ý
(GC)¯
¨
。
Ô`©àáR
(E)
Ôê3
[21]
`V6®
。
G
3
A«¤¥nc|4t/015f¬D}~
Fig.3 IndustrialyrelevantsubstratesforevaluatingtheenantioselectivityofBSEs
27
&
(
)
*
+
!
11
"
§1
4p1}~ùú5¼@©ªþTU
Table1 Reactionconditionsandanalyticmethodsforenzymatichydrolysisofvarioussubstrates
Ü
c(
Ü
)/
(mmol·L-1) h56 ¯¨56
methyl3phenylglycidate(24) 10 30℃,V(
P¡
)∶V(
x
)=1∶1,180r/min HPLC,AD H,254nm
trans3(4’methoxyphenyl)
glycidicacidmethylester(25) 10 30℃,V(P¡)∶V(x)=1∶1,180r/min HPLC,OJ H,254nm
naproxenmethylester(NME)(26) 10 30℃,5% DMSO,900r/min HPLC,OD H,254nm
ketoprofenethylester(27) 10 30℃,5% DMSO,900r/min HPLC,OJ H,254nm
2chloro1phenethylacetate(28) 10 30℃,5% DMSO,900r/min GC,ChirasilDexCP
2naphthylethylacetate(29) 10 30℃,5% DMSO,900r/min HPLC,OJ H,254nm
αacetoxyphenylaceticacid(30) 10 30℃,10% DMSO,900r/min HPLC,OD H,228nm
DLmenthylacetate(31) 10 30℃,10%
NY
,900r/min GC,ChirasilDexCP
DLmenthylbenzoate(32) 10 30℃,10% DMSO,900r/min GC,ChirasilDexCP
Ñ
:HPLC
56
(
Ï
30℃,
t9ß
20mL);GC
56
(
å¬
FID,
Ï
130℃,
t9³
280℃,
嬳
350℃,
t9ß
2μL)。
2
XYSZ[
2.1
nc|4
(BSEs)
5©ª
、
§¨o
pDg>¢
30
")%
(B.subtilis)168`
ÏÖ-
x|Ô`0¨e·¸
,N
|(s
His63R%
BL21(DE3)
.ì
,
7
"ÔK0LMN,
-ÇO,-./0þë`x|12
:PnbA,YitV,
YvaK,Nap,SrfAD,LipB
Ç
Cah,YitV
ZÕÉeèé
。
ùi
Megalign(DBAStar)
M6~ç-Ô½s
T¯¨
(
ð
4)。
æð
4
òó
:
dÅjα/β foldx
|Ô-v
5
"Ú¾`[-v
[22]:
[-vⅠ(LipB),
[-vⅢ(Cah),[-vⅤ(NapÇ YvaK),[-vⅥ
(YitV)
Ç[-vⅦ(PnbA)。SrfADU[-vⅡ(GDSL
[-v
)
_@`TÐÁ
,
µZ
SrfAD
f
Gly
AspSer(Leu)[GDS(L)]
A½
。
¨©
,
~ç
0¨Ï9R
、
ÅjÚ¾[-v`Ô
,
pòºáf
{9`STº
。
2.2
|ùú4t®¯£5ty%z{|5}~
1
µ*:µ^å
7
")%-x|Ô
Ú¾â,`K0LM-
(1~14)`
x|12
,
dÚ¾â,`ÜãR
(
ð
1),
áâ(ð
5。
æð
5
òó~çÔp§
Cah
cî
,
ÏÉ4
ÒÓ,
(C4~C8)` K0LM-./0:12。
Cah
Ôpå`èéÖ%Ü%ñ
C
¥NTÔ
,
K0LMN,-./0ödR`:12
[23]。
.î
,
7`Z
SrfAD
Ôaâ,-`Ü
13
_:12
,
~UÔÚ¨¦¾
。
G
4
A
MEGALIGN
>¢nc?
|ùú45opDg
Fig.4 Phylogeneticanalysisofalesterasesand
lipasesfromBacilussubtilis168
37
!
1
#
K*|â
:
ùiá¿Ï9R`K0LMâ,-ÇÒÓYN,-ÒÌ
7
")%-x|Ô``ÄðÝ
G5
Aty%z{|§I
7
¦
nc|ùú45231
Fig.5 Substratespecificityofpnitrophenylestersof
diferentfatyacidsassayedin
highthroughputformat
2.3
|ùú4t®¯<|5}~1
pK0LMÕÖ
pH
`-À
,
åÚ¾Y`
N,-
(15~23)(
ð
2)
x|*w&`,³
,
æ©
-x|ÔY`ÜãR
,
áâ(ð
6。
æ
ð
6
òó
:Cah
Ç
PnbA
ÔaYN-
(18~
23)
ë-0þë`12
,
µ9÷ x|ÒÓY`N
,-
(15~17),
~U3
[15,23]
èé`áâd
ô
。
p©cî
,Nap
ÔT
18、19
Ç
22,YvaK
ÔT
19,
W12
。
µ
3
"Ô
LipB、
SrfAD
Ç
YitV
eåÌþë12
。
G
6
A|§I
7
¦nc|
ùú45<1
Fig.6 Substratespecificityonacetylestersofdiferent
alcoholsassayedinhighthroughputformat
2.4
|ùú4p=>f¬D1pç~
"¯¨§
7
"-x|Ô`ÜãRn
,
÷
dõ§~çÔdç)t¦ÐQR-`©à
áRx|
。
Ðáâ
,
¡Ü`
e.e.sow`e.e.p,
Ü`VT°Ç©ßàá°
(E)
â
,
j.
2。
ÏrÔîýQR0â,-
(24~27)`
x|ë-0Á`©àáR
(E<10),
%Ô
LipB
x|Ü
24
ÇÔ
Nap
x|Ü
27
¿ë-0
â`©àáR
(E
¯qÖ
252
Ç
129)。
u
j}0k`Ü
26
Ç
27,
7
Nap
ë-0ë
!`1R
。
Ü
28~32
ZQRÑjY|`â,-
。
jÜ
28
Ç
29,
*Ô1ë-0dÙ`12
,
u)
Nap
ÔSTx|Ü
28
Ç
29
¿ë-0ÿß`à
áR
(E>200)。
µZ
,
ÏrÔÜ
30、31
Ç
32
f12o12÷Á
,
%
Cah
Ü
30
Ç
31
ë-
§÷:12
,
µ©àáR9÷Á
(E<15)。YitV
~"ÔZ!dÉe.ìÇ.
,
Ü
29(2
N
YN,-
)
:`©àáR
(e.e.p>95%)。
©î54/
YitV
ÔSTx|Ü
28(2
V
1
L
47
&
(
)
*
+
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11
"
§2 7
¦nc|ùú4t1f¬Dj~5t/01
Table2 Performancesofthesevenenzymesinenantioselectivehydrolysisofseveral
industrialyrelevantchiralesters
Ô
24 25 26
VT°
/% e.e.s/%
a Eb VT°/% e.e.s/%
a E
VT°
/% e.e.s/%
a E
LipB 54 91.3 25.2(2R,3S) 35 27.3
4.0
(2R,3S) n
c n n
SrfAD 24 0.5 1.0(2R,3S) 57 8.6
1.2
(2R,3S) n n n
Nap 60 22.2 1.6(2S,3R) 65 5.9
1.1
(2R,3S) 39 67.0 7.6(S)
YvaK 65 60.2 3.4(2R,3S) 52 8.2
1.3
(2R,3S) n n n
YitV 56 0.2 1.0(2R,3S) 55 32.2
2.3
(2R,3S) n n n
Cah n n n 51 5.6 1.2(2S,3R) n n n
PnbA 56 22.5 1.7(2R,3S) 47 6.6
1.2
(2R,3S) n n n
Ô
27 28 29
VT°
/% e.e.s/%
a Eb VT°/% e.e.s/%
a E
VT°
/% e.e.s/%
a E
LipB n n n 48.3 64.2 8.7(S) 35.4 82.6 16.5(R)
SrfAD n n n 46.9 26.8 2.2(R) 34.1 16.4 1.5(R)
Nap 47 73.8 12.9(R) 51.0 95.9 >200(S) 48.5 99.5 >200(R)
YvaK n n n 55.7 76.2 28.1(S) 45.6 92.8 28.1(R)
YitV n n n 46.9 74.6 13.5(R) 34.1 95.7 74.6(R)
Cah n n n 36.9 34.1 2.4(R) 34.9 4.2 1.1(R)
PnbA n n n 56.8 74.8 31.4(S) 40.4 93.8 60.5(R)
Ô
30 31 32
VT°
/% e.e.s/%
a Eb VT°/% e.e.s/%
a E
VT°
/% e.e.s/%
a E
LipB n n n n n n n n n
SrfAD n n n n n n n n n
Nap n n n n n n n n n
YvaK n n n n n n 0.4 65.8 4.9(l)
YitV n n n n n n n n n
Cah 79 24.5 4.5(R) 50 64.1 14.5(l) NDd n n
PnbA n n n 13 99.9 >200(l) 1.0 84.1 11.7(l)
Ñ
:a—
áâæQR
GC
o
HPLC
¯¨
;b—
©ß*^ª
(e.e.)
ê3
[22]
6®
;c—
VT°³ÁuÚºåÌ
,¨
©Ö
n(nul);
d—ND
.-å
。
NYN,-
)
¿
,
./0Ú¾jÏrÔ``ã`
©ßÞíR
。
Ôê
Kazlauskas
g
[24],^
Y0
Cõ0k`
“
ÍÎ
”
,
CjÔST
2
{©
¿ß³`"
,
Ôx|
(R)
E-&
(R)
Y
。
2
V
1
LNY`0Cõ0k
,
0kÖ
L0
,
0kÖ
—CH2Cl,µæjVÃÄuCô0k
z½+T
,
µ-Ô
/
ÒÓÔm!
Kazlauskas
gx
|
(S)
E-
,
&
(S)
Y
,
µ
YitV
x|Ü
28
(2
V
1
LNYN,-
)
¿àáR¦
,
Æ&
(R)
VY
,
©àá°
(E)
Ö
13.5。
57
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1
#
K*|â
:
ùiá¿Ï9R`K0LMâ,-ÇÒÓYN,-ÒÌ
7
")%-x|Ô``ÄðÝ
3
X
[
µ*0¨ùrêOP
,
!)%
168
·¸.ì-x|Ô
,
7
"Ô./0þë`-x
|12
,
d¯Åj
5
"Ú¾`[-v
。
ùië§
hÇ
pH
`-À:µ^}w°§~
7
"-x|
Ô`Ü`ÄÝ
,¯
¨§Ô`ÜãRÇÏ9
R
。
)~çÔST®¯)t¦Ð`QRT
`©àáRs§
,
7`Z
,
4/Ô
YitV
x | ^ Y N , - ¿ á B ( `
Kazlauskas
g
。
Â)ÕÖµ*0¨ùrêO
P4/)thid2`Ô:µ^}ïà
4Üáf§d"¬í
。
JK
:
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1319.
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characterization of enantioselective ester hydrolases from
EscherichiacoliK12[J].WorldJMicrobiolBiotechnol,2011,
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