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Recombinant nitrile hydratase from Herbaspirillum seropedicae as biocatalyst for selective hydration of 3-(4-chlorophenyl)glutaronitrile

重组固氮菌腈水合酶催化3-(4-氯苯基)戊二腈的选择性水解



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ChineseJournalofBioprocessEngineering
Vol.11No.1
Jan.2013
doi:10.3969/j.issn.1672-3678.2013.01.005
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:1672-3678(2013)01-0023-06
RecombinantnitrilehydratasefromHerbaspirilumseropedicaeasbiocatalystfor
selectivehydrationof3(4chlorophenyl)glutaronitrile
LIQian,RENJie,FENGJinhui,WUQiaqing,ZHUDunming
(NationalEngineeringLaboratoryforIndustrialEnzymes,TianjinInstituteofIndustrialBiotechnology,
ChineseAcademyofSciences,Tianjin300308,China)
Abstract:Nitrilehydratase(NHase)isthekeyenzymesofnitrilemetabolism.GenomeMiningwasutilized
toacquiretheNhasegene(hsn1)fromHerbaspirilumseropedicaeSmR1.Theplasmidhsn1/pETDuet1was
constructedandexpressedinE.coliBL21.Therecombinantenzyme(HSN1)wasidentifiedasacobalt
dependenttypeNHase.ThesubstrateprofileofHSN1wasstudiedbythewholecelreactions.HSN1showed
theexcelentregioselectivityand theenantioselectivityforthehydration of3(4chlorophenyl)
glutaronitrile.The3(4chlorophenyl)4cyanobutyramidecouldbegiven,thusitcouldbeconvertedto
baclofenbyonestepchemicalreaction.
Keywords:3(4chlorophenyl)4cyanobutyramide;hydration;nitrilehydratase
  
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rê,
(htp://www.ncbi.nlm.nih.gov/
protein)
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ø 0 , ½ Œ ¯ q U Î ï j
Pseudonocardia
thermophilaJCM3095[15]
Ç
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µ*
Genomemining
G#§ÎïjÁ%Å
H.seropedicaeSmR1`
Xx‹Ô0¨
hsn1(β [0
GenBankNO.NC_014323.1,α [0 GenBankNO.
NC_014323.1)。
ùief
(htp://www.expasy.
crg/)
ϙXx‹Ô
HSN1
`œTRx

C`0¨
æt­Ûg&?;45˜ëVW‹Œ

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ã.ìÁÂ
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DNA
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¨ÔòÌ
pETDuet 1` MCSⅠÇMCSⅡ,¯ qG#β/
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S

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hsn1/pETDuet 1
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–

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}øi‚ƒñ
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a0–
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al
OD600Â0.8,å™
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Ú¾FC¿Õ
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.쒓`€
。125%
`
SDSPAGE
efx]šþ×å™.ìáâ

1.2.3 HSN1`
1R²ÙqÜÝïà
i
50mmol/L、pH7.2
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K3PO4ÍÎ~
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•–å™

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pH15
:V,

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3 (4
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YX`x|
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z
32Lhsn1/BL21
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β[00¨»¼(660bp)(ð1);hsn1/pETDuet

Çα/pETDuet 1.ùxSÅ NdeⅠÇ XhoⅠú
Ôxn¯q#ÌC`5q β/pETDuet 1(6.08
kb)、pETDuet 1(5.42kb)
q α [00¨»¼
(600bp)(
ð
2)。
1—
.ùxSβ/pETDuet1eë°R0xÔ
NcoⅠÇHindⅢúÔx`áâ;M——Õef
G
1 
…†éüβ/pETDuet1\4ÿ¥¦G
Fig.1 Digestedelectrophoretogramof
recombinantplasmidβ/pETDuet1
1—
.ùxS
hsn1/pETduet1
eë°R0xÔ
NdeⅠÇXhoⅠúÔx`áâ;2—.ùxS
α/pETDuet1eë°R0xÔNdeⅠÇXhoⅠ
úÔx`áâ
;M—
—Õef
G
2 
…†éü
hsn1/pETduet1
’
α/pETDuet1\4ÿ¥¦
Fig.2 Digestedelectrophoretogramsof
recombinantplasmidhsn1/pETduet1
andα/pETDuet1
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.ùÁ%Xx‹ÔST
3(4
VL0

YX`àáRx|
2.2 
%!
hsn1
5§¨XY
Xx‹Ô0¨
hsn1`
.쒓Úuòß

}T
.ì56“f˜˜ž}e(
HSN1`
ò{.ì

j
Z
HSN1`
STh]:i
hsn1/pETDuet1/BL21
‚R‘%[º)ÀޝhßÁ



}¦¾œ³
(40μmol/L)Fe3+oCo2+o¾9`a56D`Ë
4h~

³;%ßÀÞ¾9hßÁ
(100mg
F%
ßi
K3PO4ÍÎ~.Ël1mL–,LZX›œ³
Ö
15mmol/L)
q¦¾h¿Õ
(2h),TLC
å™}
Fe3+
`hßÁ– Aƒw&Œ

u}
Co2+

hßÁ˜LZ„6&Œ
,¨
©
HSN1
ÖÞß
Co2+
`
Xx‹Ô
。hsn1
`.ì56
:CoCl2›œ³Ö 40
μmol/L[18],” OD600≈ 08¿,(s IPTG(›œ³
05mmol/L),25℃
FC
6h,
.ìáâ¡ð

*-

β[0¦¯Äx^ÂÖ25×104,α [0¦
¯Äx^ÂÖ
22×104。
1—
ËìÓ

Ú(
IPTG
FC
);2—
%ßÉÊ~`t™

3—
%ßÉÊ~`3Ý
G
3 hsn1
û§¨5XY
Fig.3 Resultsofthecoexpressedhsn1
2.3 HSN1
5}~¡þšXY
HSN1
STLZXh
13h
n

Üeÿ[V
T

n›œ#Ì
285mg
w

wÅU—ÕJ9¾
q£¤ÓÖLZ„6
。13CNMR(CDCl3,600
MHz),δ(10-6):16835(CO),13475(C 1),
13164(C 4),12864(C 3,C 5),12790(C
2,C 6)。
"þµ*0¨rêOPG#`ÎïjÁ
%Å`0¨
hsn1
×엘ST12`Xx‹Ô


Xx‹Ô
HSN1`
ÜÝ¡.

*-

æ.

òó
:HSN1
ÈÞßj„avX×Ü
[8],
w•
Ö¶XÜ¡

¬0Zc
、4
¬0Zc˜=ß
`ST12

uíL¶4w0X`3ÃÄrC˜
*e(¿
,HSN1
™Úº›./0ST12

§
1 HSN1
‘p®¯}~7ÅpÄ
Table1 DiferentsubstratescatalyzedbyHSN1
anddiferentconversions
Ü w VT°
/%


師
N CN


師
N CONH2
97


師

CN


師

CONH2
78


師


CN


師

CONH




師
98


師
CN CONH2



師

CN 帨

師

CONH2 0


師

CN


師

CONH2

NC
NH


H2NOC
NH



 
Ñ
:HSN1
ÜÝ噝hßÁC
100mg
F%ß

i
K3POP4ÍÎ
~
(50mmol/L,pH7.2)
.Ël
1mL,
(sܓ<•›œ³
Ö
15mmol/L;
sfËhßÁÖzÜ(sÌ
1mLK3PO4
ÍÎ~–

“<•›œ³Ö
15mmol/L,
h³Ö
30℃,
h
¿ÕÖ
30min。
2.4 HSN1
‘p
3 (4
Žz%

Ûèø˜"

(4
Žz%
) 4
á%åŠ#
  HSN1
ST
3 (4
VL0

YXx‹h

50h
0Üÿ[VT

n›œ#Ìwl
131mg,¯
–
w°Ö
72%,
wÅxÝU£¤ÓÖ
3 (4
VL
0
) 4
¬0O„6
。ESIMS(+):m/z2450[M+
Na]+。1HNMR(CDCl3,600MHz),δ(10
-6):734
(d,J=84Hz,2H),723(d,J=84Hz,2H),5.43
(s,2H),358~354(m,1H),283~272(m,3H),
265~261(m,1H)。13CNMR(CDCl3,600MHz),δ
(10-6):17168(CO),13913(C′6),13376(C′
1),12926(C′2,C′4),12846(C′3,C′5),
11788(CN),3982(C 4),3725(C 3),2404
(C 2)。
62
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¬0O„6”
Br2Ç
NaOH
`ÕiD

Å*x©y.zqX0x|&Œ
?V@

ð
4),
U?V@—Õl¾òó
,´
«w
Ö

¿E?V@

•
e.e.
ªÖ
22%(
ð
5)。
ùi
Ÿ¦
HPLC
zw
3 (4
VL0
) 4
¬0O„6
­sQR¯–

µ
e.e.
ª7Ö
52%(
ð
6)。
G
4 HSN1
‘p
3(4
Žz%

Ûèø˜"

(4
Žz%
)4
á%åŠ#

o$pÓ
U˜"%Ž&
Fig.4 3(4chlorophenyl)glutaronitrilehydratedinto
3(4chlorophenyl)4cyanobutyramide,
andconvertedintobaclofen
19519min
›ÎÖ

¿E?V@

30063min
›Ö

¿E?V@
G
5 
%Ž&51
HPLC

Fig.5 ChiralHPLCanalysisofbaclofen
24393min
›ÎÖ

¿E
3 (4
VL0
) 4
¬0O„6

31358min
›ÎÖ

¿E
3 (4
VL0
) 4
¬0O„6
G
6 3(4
Žz%
)4
á%åŠ#51
HPLC

Fig.6 ChiralHPLCanalysisof3(4chlorophenyl)
4cyanobutyramide
”å™
HSN1
STÜ
3 (4
VL0

YX
`h¿ÕqÜVT°`¾¿

{rs§VT­+
ZŸw`
e.e.
ªw&‚`€

áâ(.
2。
æ.

òó

h¿ÕÖ
6h
¿
,HSN1
ST
3 (4
V
L0

YX`VT°æ‚j
90%,
<=¿Õ`‹Œ
ÑÈ

VT°rª+Tÿ•Í•

*#w
3 (4
VL0
)4
¬0O„6

¿E`
。e.e.
ª<=¿Õ
ÇVT°`+Tï/0jeț@Á`ðñ

µÕ
ßu|

©ß*^ª<=h­+˜*}ª

§
2 HSN1
‘p
3(4
Žz%

Ûèø¼@7j~
e.e.
Æ
Table2 3(4 chlorophenyl)glutaronitrilecatalyzedby
HSN1,ande.e.ofproduct
¿Õ
/h
VT°
/% e.e./%
0.5 30 8.4
1 68 11.4
2 71 18.2
6 93 9.8
12 95 9.1
48 98 9.8
      
Ñ

C
100mg
F%ß

i
K3PO4ÍÎ~
(50mmol/L、pH7.2)
.Ël

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