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Comparative evaluation of seven recombinant ester hydrolases from Bacillus subtilis 168 using structurally diverse p-nitrophenyl carboxylates and acetylated alcohols

利用结构多样性的对硝基苯酚羧酸酯和脂肪醇乙酸酯评估7个枯草芽胞杆菌酯水解酶的指纹图谱



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ChineseJournalofBioprocessEngineering
Vol.11No.1
Jan.2013
doi:10.3969/j.issn.1672-3678.2013.01.013
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:1672-3678(2013)01-0070-08
Comparativeevaluationofsevenrecombinantesterhydrolases
fromBacilussubtilis168usingstructuralydiversepnitrophenyl
carboxylatesandacetylatedalcohols
LIUJiayan,QIANLe,ZHENGGaowei,XUJianhe
(StateKeyLaboratoryofBioreactorEngineering,EastChinaUniversityofScienceandTechnology,Shanghai200237,China)
Abstract:ThirtyputativehydrolasegenesfromBacilussubtilis168wereclonedandexpressedbasedon
thepublishedgenomicinformationinGenBank.Sevenenzymesshowedsignificantlipolyticactivities
towardspnitrophenylesters.Phylogeneticanalysisrevealedthattheseenzymesbelongtofivesubfamilies
ofα/βhydrolasefamily.HighthroughputscreeningmethodsinvolvingchromogenicsubstratesandpH
indictorwereusedtoobtainactivityfingerprintoftheseenzymestowardsestersofcarboxylicacidsand
acetatesofalcohols.Theenantioselectivityoftheseenzymestowardsvariouschiralsubstrateswasalso
investigatedandcompared.ItwasshownthattheesterasePnbA(aparanitrobenzylesterase)andCah
(anSdeacylase)acceptedabroaderrangeofacetylestersofalcoholsthantheothers.TheenzymesPnbA
andNap(carboxylesteraseNP)exhibitedexcelentenantioselectivity(E>200)inhydrolysisofdl
menthylacetate2chloro1phenethylacetateand2naphthylethylacetate.Moreover,anovelenzymeYitV
wasactedasanantiKazlauskascatalystinhydrolyzing2chloro1phenylethylacetatewithmoderate
enantioselectivity.
Keywords:activityfingerprint;genomeofBacilussubtilis;highthroughputassay;hydrolasefamily;lipase
  
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[1]。
/”<=ó&0
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º`ԟ+#ÍÎ΅
[2-4]。
Ž)‘%`0¨
ù½ŒÆ”
1997
$pæÅV‰
[5],30
"0¨eÏ
™òºÖx|Ô

•–dçÔæÅe²ÙÇ.š

í¡
LipA
Ç
LipB[6-9]。


Î=
B.subtilisThai
I 8`
â,-Ô
NP(
æ
nap
0¨ab

æeij®
¯«ÇßXÈn
[10]。
Ô
YbfK(
æ
ybfK
0¨a
b
),
eèéºSTx|îˆý`
IPG(1,2O
isopropylideneglycerol)
P,-&Œ
e.e.
ªÖ
999%
`
(S) IPG[11-12]。
Î=Ž)‘%
NRRLB8079
`K0i0-ÔW”
1995
$”‚R‘%–e·
¸

.ìÇ.š
[12-13]。
Ž)‘%
DSM402
–0
¨ÚÖ
yvak`
-ÔWe4/ºSTx|

LNY
N,-“—˜÷:`©àáR
(E>150)[14]。
Ž
)‘%
ECU0554
`-Ôº”:ܜ³
(1mol/L)
DST®¯WXY

—˜ÿ:`©à
áR
(E>200),
“e·¸.ìj‚R‘%–
[15-16]。
>u

Ž)‘%–¡˜ùÏx|Ô`Rxǝ
º>Še23èé

ÉJD’%Ž)‘%
168`
0¨ù­s
OP

Jð4/—˜hid2`x|Ô

Â)Ռ
.ì§

"—˜þë-x|12`Ž)‘%


•ø0,½Œ¯¨.þ

Žd¯qÅj


¾`[-v

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ò=µ*:µ^`
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RÇÏ9R

“)•)t¦ÐQR-x|
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1 
QRSTU
1.1 
c(
Ž)‘%
(B.subtilis168)
æ–?"|&
œ&o23*DÊ23üÂÃ

‚R‘%
E.coli
DH5αij·¸ìÓ,E.coliBL21(DE3)ij.ù
Ô`.ì

ËÖÂìÓ\””

1.2 
“”%
LB
`a0
(g/L):NaCl10,
efg
10,
hiš
5;
j
121℃
:/½%
20min。
=FC`a0
(g/L):
efg
10,
hiš
5,
Na2HPO4895,KH2PO434,NH4Cl267,Na2SO4
071,MgSO4024,SA 5,bcd 05,md 2;j
115℃
:/½%
30min。
1.3 
|45©ª’§¨
Ž)‘%
168
–
30
"ϙÖx|Ô`0
¨eûd·¸
[5],
Å*
PCR
‹enÔxÔòj.ì
ˆß
pET 28a,
“VTÌh´
E.coliBL21(DE3)
–­s.ù.ì

*˜.ùĔ
LB
`a0–`a{Ä~
(37℃),
”=FC`a0
[17]
–`a
20h(25℃)。
º)Ŗ—
(6500r/min10min)
³;n

iË,Ì
ÍÎ~ÅÆ

É
(01mol/L,pH70),
›!ÈÉÊ

p
SDS PAGE
0¨`.쒓

i
Bradford
„
å™efœ³

ÉÊn`t™Ô~$Çnj
4℃
”
“±i

1.4 
4uþš
.ùÔÔ12å™ÊË3­
[18]。
Ô1(Ñ
(U)
ÙÒ֔å™56DÓ¯Ôw&
10μmol
K0LM*‰«`Ô^

1.5 
}~€1
1.5.1 
ԍK0LMâ,-`ÜãR
ùiK0LM-Ôx|&Œæ§`K
0LM
[19]
å™-Ô`12

*iܗ˜á¿Ï9
R

ð
1)。
ì°Üi~

Ü{jYZ0[(DMSO),
œ³Ö
1mmol/L。
hßÁÖ

Ô{~
10μL,Üi~50μLÇKPBÍÎ~140μL(100
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zpt{~øƒ(s
96
ºüÝ
sԗä
,30℃
¦«
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n

”
404nm
DÓÖ
20s
å™

ÉÆɪ

¥
10min。
1.5.2 
ԍھYN,-`ÜãR
:iK0LMÕÖ
pH
`-À

å™N,-
Ôx|*&Œ`N,^
[20],
*iå™Ü(ð
2。
å™~ùŒ
:30mmol/L
Ü

NX{~
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NX
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50mmol/L
N,N
ú
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CÔ~

Ç
100μLtuå™
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96
ºÔ—ü

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”
25

¦«
10s,
Ó
30s
å™
404nm
›Æɪ

¥
10
min,
—ß6®(’
(1)。
N,&Œƒ°
(μmol·min-1)=
dA
dt×
cB
cin
× 1
Δε404l
V×106 (1)
17 
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#
 
K*|â

ùiá¿Ï9R`K0LMâ,-ÇÒÓYN,-ÒÌ

"Ž)‘%-x|Ô``ÄðÝ
’–
:dA/dt
ZӯԔ
404nm
›Æɪ`+T
ª
,cBZÍÎ~œ³(mol/L),cinZ`-ÀK0L
M`œ³
(mol/L),Δε404Z pH`-ÀK0LM
`xÄTÇ«xÄT

{á¿`ˆÉÁrc¥
(17300mol-1·L·cm-1),l
ZÉ+

ԗü–
105
μL~ß`É+Ö0306cm),V֝hߞ。
G
1 
A«§I‹Œ†nc|423‚€15XÊo@1ty%z{|
Fig.1 StructureofpnitrophenylestersusedforprofilingsubstratespecificityofBacilussubtilisesterases(BSEs)
G
2 
A«§I‹Œ†nc|4}~€15<›‚|
Fig.2 AcetylestersofalcoholsforfingerprintingsubstratespecificityofBSEs
1.6 
4»ùú1}~5t/01
h~TŸ
10mmol/L
Ü

ð
3)
ÇÔ{~

h56(.
1。
hJ9iN,N-;Coñò
C˜â¦

Çon­s:ž~¦§Ý
(HPLC)
oz
¦§Ý
(GC)¯
¨

Ô`©àáR
(E)
Ôê3­
[21]
–`V’6®

G
3 
A«¤¥‹Œ†nc|4t/015f¬ŸD}~
Fig.3 IndustrialyrelevantsubstratesforevaluatingtheenantioselectivityofBSEs
27
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11
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§1 
4‘p1}~ùú5¼@©ª’þšTU
Table1 Reactionconditionsandanalyticmethodsforenzymatichydrolysisofvarioussubstrates
Ü
c(
Ü
)/
(mmol·L-1) h56 ¯¨56
methyl3phenylglycidate(24) 10 30℃,V(
P¡
)∶V(
x
)=1∶1,180r/min HPLC,AD H,254nm
trans3(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
2chloro1phenethylacetate(28) 10 30℃,5% DMSO,900r/min GC,ChirasilDexCP
2naphthylethylacetate(29) 10 30℃,5% DMSO,900r/min HPLC,OJ H,254nm
αacetoxyphenylaceticacid(30) 10 30℃,10% DMSO,900r/min HPLC,OD H,228nm
DLmenthylacetate(31) 10 30℃,10%
NY
,900r/min GC,ChirasilDexCP
DLmenthylbenzoate(32) 10 30℃,10% DMSO,900r/min GC,ChirasilDexCP
 
Ñ
:HPLC
56

ύ
30℃,
t9ߞ
20mL);GC
56

噬
FID,
ύ
130℃,
t9³
280℃,
噬³
350℃,
t9ߞ
2μL)。
2 
XYSZ[
2.1 
‹Œ†nc|4
(BSEs)
5©ª

§¨’o
pDg>¢
  30
"Ž)‘%
(B.subtilis)168`
ϙÖ-
x|Ô`0¨e·¸
,N
|(s
His6—3”‚R‘%
BL21(DE3)
–.ì

•–

"ԍK0LMN,
-ÇO,-./0þë`x|12
:PnbA,YitV,
YvaK,Nap,SrfAD,LipB
Ç
Cah,YitV
ZÕÉeèé

ùi
Megalign(DBAStar)
M6~ç-Ô½Œ­s­
T¯¨

ð
4)。
æð

òó

ŽdÅjα/β foldx
|Ô-v–

"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)]
”A½Œ

¨©

~ç—
˜0¨Ï9R

ÅjÚ¾[-v`Ô

p˜òºáf
{9`STº

2.2 
|ùú4t®¯£‚5ty%z{|5}~
€1
  
µ*:µ^å™

"Ž)‘%-x|ԍ
Ú¾â,`K0LM-
(1~14)`
x|12


ŽdÚ¾â,`ÜãR

ð
1),
áâ(ð
5。
æð

òó~çÔp§
Cah


‚ύ–É4
ÒÓ,
(C4~C8)` K0LM-./0:12。
Cah
Ԕpå`èé–Ö%Ü%ñ

¥N„TÔ

ŽK0LMN,-./0ödR`:12
[23]。


˜7`Z
SrfAD
ԍ„aâ,-–`Ü
13
—˜_:12

~U•ŸÔÚ¨¦¾

G
4 
A
MEGALIGN
>¢‹Œ†nc?
­|ùú45opDg
Fig.4 Phylogeneticanalysisofalesterasesand
lipasesfromBacilussubtilis168
37 
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K*|â

ùiá¿Ï9R`K0LMâ,-ÇÒÓYN,-ÒÌ

"Ž)‘%-x|Ô``ÄðÝ
G5 
Aty%z{|œ’™§I

¦‹Œ
†nc|ùú4523‚€1
Fig.5 Substratespecificityofpnitrophenylestersof
diferentfatyacidsassayedin
highthroughputformat
2.3 
|ùú4t®¯<›‚|5}~€1
pK0LMÕÖ
pH
`-À

å™Ú¾Y`
N,-
(15~23)(
ð
2)
x|*w&`,³

æ©
-x|ԍY`ÜãR

áâ(ð
6。
æ
ð

òó
:Cah
Ç
PnbA
ԍ„aYN„-
(18~
23)
ë-0þë`12

µ9÷ x|ÒÓY`N
,-
(15~17),
~U3­
[15,23]
èé`áâd
ô

p©cî
,Nap
ԍT‹
18、19
Ç
22,YvaK
ԍT‹
19,
W˜12

µ•Ÿ


LipB、
SrfAD
Ç
YitV
“Šeå™Ìþë12

G
6 
A›‚|œ’™§I

¦‹Œ†nc|
ùú45<€1
Fig.6 Substratespecificityonacetylestersofdiferent
alcoholsassayedinhighthroughputformat
2.4 
|ùú4‘p=>f¬ŸD1pç~
”"ƒ¯¨§

"-x|Ô`ÜãRn

÷
­dõ§~çԍdç)t¦ÐQR-`©à
áRx|

˜Ðáâ

¡Ü`
e.e.sow`e.e.p,
Ü`VT°Ç©ßàá°
(E)
â

Œj.
2。
‚ÏrԍîˆýQR„0â,-
(24~27)`
x|ë-0Á`©àáR
(E<10),
%˜Ô
LipB
x|Ü
24
ÇÔ
Nap
x|Ü
27
¿ë-0
–â`©àáR
(E
¯qÖ
252
Ç
129)。

j}˜‚0k`Ü
26
Ç
27,
7
Nap
ë-0ë
!`1R

Ü
28~32
ZQR–—ÑjY|`â,-



28
Ç
29,
*˜Ô1ë-0dÙ`12

u)
Nap
ԔSTx|Ü
28
Ç
29
¿ë-0ÿß`à
áR
(E>200)。
µZ

‚ÏrԍÜ
30、31
Ç
32
f˜12o12÷Á


Cah
Ü
30
Ç
31
ë-
§÷:12

µ•©àáR9÷Á
(E<15)。YitV
~"ÔZ!dÉe.ìÇ.š

ŽÜ
29(2
•N
YN,-

—˜:`©àáR
(e.e.p>95%)。
©î54/
YitV
ԔSTx|Ü
28(2
V

L
47
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(
 
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§2 7
¦‹Œ†nc|ùú4t1f¬ŸDj~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]

;c—
VT°³ÁuÚºå™Ì
,¨
©—˜Ö
n(nul);
d—ND
.-Šå™

NYN,-

¿

./0Ú¾j•ŸÏrÔ``ã`
©ßÞíR

Ôê
Kazlauskas
‰g
[24],^
Y­0
”Cõ0k`

ÍÎ

‚‘

CjÔST

{©
¿ßƒ³`"•

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(R)
E-&Œ
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L0

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—CH2Cl,µæj˜VÃÄuCô0k
z½+T

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|
(S)
E-


(S)
Y

µ
YitV
”x|Ü
28
(2
V

LNYN,-

¿àáR¦

Æ&Œ
(R)
VY

•©àá°
(E)
Ö
13.5。
57 
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ùiá¿Ï9R`K0LMâ,-ÇÒÓYN,-ÒÌ

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3 
X
 
[
µ*0¨ùrêOP

!Ž)‘%
168
–
·¸.ì-x|Ô

•–

"Ô./0þë`-x
|12

Žd¯Åj

"Ú¾`[-v

ùië§
hÇ
pH
`-À„:µ^}w°§~

"-x|
Ô`Ü`ÄÝ
,¯
¨§Ô`ÜãRÇÏ9
R

“)~çÔST®¯)t¦Ð`QRT‹
`©àáR­s§

˜7`Z

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