Hydroxynitrile lyase (Hnl)
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1 Hydroxynitrile lyase (Hnl) R 1 HCN R 1 OH R 2 C O R 2 C * CN S-selective: Hevea brasiliensis R-selective: Prunus spp.
2 (S)-Hnl of Hevea brasiliensis and (R)-Hnl of Prunus amygdalus Hb_Hnl Type II Hnl intracellular protein 29.2 kda homodimer / hydrolase fold protein catalytic triad (S)-selektive Pam_Hnl Type I Hnl secretory protein 61 kda ( 57.9 kda) Homology to oxidases FAD N-glycosylated isoenzymes (R)-selektive
3 3-D structure of Hb_HNL K236 C81 S80 H235 D207
4 Intracellular Hnl Expression in Escherichia coli Translational Coupling ATG...AATAAGGAGAATAAACCATGGCATTC Met...AsnLysGluGlu * MetAlaPhe mini-cistron SD NcoI Hnl ORF P trc HbHnl ORF T rrnb pse420 phnl-200
5 Soluble
6 Intracellular Hnl Expression in Saccharomyces cerevisiae and Pichia pastoris ATTATTCGAACGAGGCCATGGCATTC EcoRI MetAlaPhe Hnl ORF AAAGATCCCCCGGGCTGCAGGAATTCCATGGCATTC Hnl ORF BamHI/BglI MetAlaPhe P AOX PGK Hnl ORF T PGK AOX phild2 pma91 phnl-400 phnl-300
7 Secretory Hnl Expression in Saccharomyces cerevisiae and Pichia pastoris XbaI MF 1-leader GGGGTATCTCTCGAGAAAAGAGAGGCATTC GlyValSerLeuGluLysArgGluAlaPhe Hnl ORF P AOX PGK P.pastoris AOX1 Promoter Hnl ORF phnl-401 T PGK AOX phild2 pma91 Vector basis S.cerevisiae PGK Promoter phnl-309
8 Secretion-targeted Hb_Hnl accumulates in the cell periphery intracellular secretory
9 Hb-Hnl expression in filamentous fungi P gpd Hnl ORF TtrpC panhnl P gla Hnl ORF TtrpC pglahnl P uce aox Hnl ORF T pucehnl trpc paoxhnl P gla SS gla24 Hnl ORF TtrpC pglass1hnl P gpd P gla P P aox gla SS gla24 Hnl ORF TtrpC p***hnl-pyrg pyrg gpd: A.niger glyceraldehydephosphate dehydrogenase gla: A.awamori glucoamylase uce: unknown constitutively expressed gene, P.chrysogenum aox: P.chrysogenum alcohol oxidase
10 Intracellular Hnl Expression in Penicillium chrysogenum under control of P AOX Termination Problem AOX: Penicillium chrysogenum Alcohol Oxidase PAOX Hnl ORF T TrpC paoxhnl PAOX Hnl ORF T AOX paoxhnl-ta paoxhnl-tat PAOX Hnl ORF T AOX T TrpC
11 Southern analysis of Penicillium chrysogenum P AOX transformants B paoxhnl-tat paoxhnl-ta
12 Northern blot analysis of Penicillium chrysogenum P AOX transformants paoxhnl-tat C Hnl probe C Actin probe
13 Western blot analysis of Penicillium chrysogenum P AOX transformants Protease Problems Total cellular proteins - SDS PAGE Western blot with Hnl Antibody B 97 kd 66 kd 45 kd paoxhnl-tat 97 kd 66 kd 45 kd A 31 kd 21 kd 14 kd 66 kd 45 kd 31 kd 21 kd 14 kd A 31 kd 21 kd 14 kd Hnl paoxhnl-ta 97 kd 66 kd 45 kd 31 kd 21 kd 14 kd Degradation!
14 Expression analysis of Penicillium chrysogenum P AOX transformants Hnl Expression AOX Promoter Activity Test uida: Reporter gene, ß-glucuronidase AOX::uidA fusion 2% lactose ph 8 Blue colour = cleavage of X-Glucose by ß-glucuronidase paoxhnl-tat negative control v.i purified HNL
15 Gene replacement in Pichia pastoris at AOX1 AOX1 promoter HIS4 selection marker AOX1 transcription termination signal 3 AOX1 region Amp R F1 ori ColE1 replicon NotI NotI 5 P AOX1 Gene o.i. TT HIS4 3 AOX1 Mut s 5 AOX1 TT 3
16 Pichia pastoris Hb_Hnl expression strain 1-17 Fed-batch fermentation Cell density [OD600] Cell density Methanol Hnl-activity time [h] specific Hnl-activity [U/mg]
17 Pichia pastoris Hb_Hnl expression strain 1-17 Fed-batch fermentation Fermentation time (hours after induction) ST ST Soluble proteins in cell extracts
18 Heterologous Hnl Expression (shake flask experiments) Construct Host cytosol (U/mg) purified enzyme (U/mg) total per culture Hevea brasiliensis phnl-200 E. coli phnl-300 S. cerevisiae phnl-400 P. pastoris panhnl A. niger U/g (leaves) U/ml OD= U/ml OD= U/ml OD= ~ 0.1 U/ml nd
19 Production of Hb_Hnl with Pichia pastoris Expression System ( Fed-Batch Fermentation) Cell wet weight Cell dry weight Total protein Hnl protein Hnl units 400 g / l 100 g / l 56 g / l 23 g / l 1.4 x 10 6 / l
20 (S)-Hnl of Hevea brasiliensis and (R)-Hnl of Prunus amygdalus Hb_Hnl Type II Hnl intracellular protein 29.2 kda homodimer / hydrolase fold protein catalytic triad (S)-selektive Pam_Hnl Type I Hnl secretory protein 61 kda ( 57.9 kda) Homology to oxidases FAD N-glycosylated isoenzymes (R)-selektive
21 Pam_Hnl5: Secretory Expression of Prunus amygdalus (R)- Hnl in Pichia pastoris P AOX1 SS Hnl ORF TT HIS4 3 AOX1 Host: Pichia pastoris GS115 Alpha factor signal sequence Mut s and Mut + Transformants Functional secretory expression Endo H d n u EndoF u Endo F n d 97 kda 66 kda 39 kda 27 kda highly glycosylated 21 kda 14 kda
22 High-level Expression Clone D1-17??? Super expression strain D1-17 Standard expression clone Hnl wt great success with expression Engineered Hnl Proteins do it the same way! High expression levels were Not Reproducible!!
23 High-level Expression Clone D1-17??? ATTATTCGAACGAGGCCATGGCATTC EcoRI MetAlaPhe Hnl ORF phnl-400 PAOX Hnl ORF TAOX phild2 Intracellular Hnl Expression in Pichia pastoris Haßlacher et al., Prot.Expr.Purif., 1997 Not the Problem!
24 Molecular Analysis of Expression Strain Southern blotting HNL probe Strange Fragments AOX1 Probe More than one Copy Integrated How??
25 Molecular Analysis of Expression Strain ~ 400 bp Deletion Hnl Δ 383 bp Δ 29 bp Hnl Tandem Integration head to head (divergent) P AOX1 P AOX1 3 copies of Hnl, 1 standard Integration in AOX1 Locus 2 truncated, in a head to head oriented AOX1 Promoter Fragments
26 Expression analysis phhaox561(-hbhnlwt) Expression phhaox915(-hbhnlwt) paoxgrazlang(-hbhnlwt) paoxgrazshort(-hbhnlwt) paoxgraztotal(-hbhnlwt) single copy D1.17
27 Specific genomic setup Hartner et al., Nucleic Acids Research, 2008, Vol. 36, Specific complex?? Concerted action of activators?? Repression-active site deleted??
28 hh - Expression vector CYC1 transcription termination TEF1 promoter Zeocin EM7 promoter EcoRV (6610) 3 AOX1 XmnI (6164) EcoRV (7578) EheI (5801) BglI (7445) EheI (5687) EheI (5666) XmnI (5160) ColE1 ori phhaox 561-HbHNL wt 8568 bp HIS4 BglII (2) paox1- hh SalI (4211) HindIII (74) BglI (3622) XmnI (3728) EheI (3766) KpnI (3837) 1.17 hhaox1 long BglI (676) 1.17 hhaox1 short KpnI (3225) HindIII (1413) EcoRI (1484) NdeI (1527) HbHNL wt NotI (2269) XmnI (2280) 3 AOX transcription termina HindIII (2615) HindIII (2627) EcoRV (2785) GOI
29 Expression of Hb_Hnl mutants in Pichia pastoris Super expression strain D1-17 Standard expression clone Novel expression clones Modified hh-aox1-based promoter System Intracellular Expression Hnl
30 Screening for High-level Expression Screening systems based on principle of translational coupling Well known in Prokayotes Does it work in Eukaryotes??? P AOX1 Hb_HNL Sh_ble 3 -AOX1 Zeocin R 5 Cap 3 Poly A ATG Stop Hb_Hnl Veeresh Juturu, PhD Thesis Stop Start NNNUGAATGNNN. Bicistronic system 1 mrna, 2 Proteins Sh_Ble
31 Correlating Hnl expression to zeocin resistance Veeresh Juturu, PhD Thesis Increasing Zeocin Concentration MD 4.9x10 4 BMMS 4.9x10 4 BMMS 4.9x µg/ml BMMS 4.9x µg/ml BMMS 4.9x10 4, 150 µg/ml
32 Hnl expression Screen for High Resistance Check for Expression Level A B C D E F mg/l Zeocin 150 mg/l Zeocin Controls Single copy D1-17 Row A Clones from BMMS 50 µg/ml Zeo Row C Clones from BMMS 150 µg/ml Zeo Lane 1D-1F GFP expressing strain (- control) Lane 4D-4F P. pastoris HNL single copy strain (+ control) Lane 8D-8F P. pastoris HNL multi copy strain (+ control)
33
MOL.911 HNL Expression
1 W I S S E N T E C H N I K L E I D E N S C H A F T MOL.911 HNL Expression www.tugraz.at 2 Hydroxynitrile lyase (Hnl) R 1 HCN R 1 OH R 2 C O R 2 C * CN S selective: Hevea brasiliensis R selective: Prunus
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