simple and quick ms analysis of chemically synthesized … · 2017. 6. 16. · simple and quick ms...
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Simple and Quick MS Analysis of Chemically Synthesized Glycopeptides: Hydrogen/Deuterium Exchange (HDX)/MS for Verifying Racemization *Izumi Sakamoto (1), Kenji Hirose (2)
Introduction
(1) AcroScale Inc., Sendai, Japan; (2) Nihon Waters K.K., Osaka, Japan
The production of glycoproteins is facing a new era. Chemical syntheses of
biologically active glycoproteins such as erythropoietin (EPO) and interferon
beta (IFN-b) have recently been realized. Since such processes are often
accompanied by racemizations of amino acid residues and chromatographic
separation of the resulting diastereomeric peptides is practically difficult, a
simple and quick detection method is highly required. Here, we present the use
of hydrogen/deuterium exchange (HDX) / MS to reveal the partial racemization
of amino acid residues in chemical syntheses of glycopeptides.
Concept & Methods
Asn
The chemical synthesis of sialylglycoproteins is challenging because of the unexpected lability of the sialyl
linkage under acidic conditions, which is a common problem in organic synthesis
R = H R = Protective
Group
Interferon b-1a
• Glycoprotein, 166 amino acid residues
• Glycosylated at Asn80
Lability of the sialyl linkage
under acidic conditions
Using the protective group
Deprotection : Hydrolysis with sodium hydroxide Racemization of amino acid residues?
A glycopeptide was treated with sodium deuteroxide solution for deprotection. After treatment of the
reaction mixture with H2O, hydrogen/deuterium exchange (HDX) via enolization of the carbonyl Cα-H
was monitored by ESI-QTOF-MS.
Monitoring Q-TOF systems
NaOD
D2O
OR
Desirable Condition
Undesirable Condition
Results
Chemical Synthesis of Glycopeptides / Glycoproteins
0.1 mM
Sample
50 mM NaOD
D2O,
Temp., Time
Sample Interferon β fragment
Chromatogram (TIC):
Temp.: 0 ℃,
Reaction Time: 30 min, 60 min, 180 min
Chromatogram
After deprotection, the peak remained at the same retention time.
12/09/12 2238-24-Bn on ice 180min 10uL injection
Time6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00 7.10 7.20 7.30 7.40 7.50 7.60 7.70 7.80 7.90 8.00 8.10 8.20 8.30
%
3
6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00 7.10 7.20 7.30 7.40 7.50 7.60 7.70 7.80 7.90 8.00 8.10 8.20 8.30
%
1
6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00 7.10 7.20 7.30 7.40 7.50 7.60 7.70 7.80 7.90 8.00 8.10 8.20 8.30
%
1
6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00 7.10 7.20 7.30 7.40 7.50 7.60 7.70 7.80 7.90 8.00 8.10 8.20 8.30
%
2
IS_2238_24_Bn_ice_180min 1: TOF MS ES+ TIC
3.72e4
6.881544.69
6.07500.88
IS_2238_24_Bn_ice_60min 1: TOF MS ES+ TIC
4.13e4
6.881544.64
6.12500.90
IS_2238_24_Bn_ice_30min 1: TOF MS ES+ TIC
4.03e4
6.881544.32
6.08541.93
IS_2238_24_Bn_ice_start 1: TOF MS ES+ TIC
3.05e4
7.551604.35
7.291574.347.19
1574.00
6.901543.98
6.02524.91
Synapt12/09/12 2238-24-Bn on ice 180min 10uL injection
m/z1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
%
0
100
m/z1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
%
0
100
m/z1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
%
0
100
IS_2238_24_Bn_ice_180min 796 (6.889) Sm (SG, 2x2.00); Cm (792:802) 1: TOF MS ES+ 544
A: 4627.00±0.001158.75
1158.49
1158.24
1157.99
1159.00
1159.25
1159.50
1159.75
1160.01
1160.251160.48 1160.77
1161.08 1161.60
IS_2238_24_Bn_ice_60min 795 (6.880) Sm (SG, 2x2.00); Cm (792:801) 1: TOF MS ES+ 607
A: 4627.00±0.001158.75
1158.49
1158.23
1157.99
1159.01
1159.26
1159.51
1159.74
1160.001160.25 1160.47
IS_2238_24_Bn_ice_30min 795 (6.880) Sm (SG, 2x2.00); Cm (792:802) 1: TOF MS ES+ 627
A: 4627.00±0.001158.49
1158.23
1157.99
1158.75
1159.00
1159.25
1159.50
1159.76
1159.99 1160.271161.16
Spectrum: Calcd.:[M+3H]3+1157.98
Start
30 min
60 min
180 min
Temp.: 0 ℃, 24 ℃, 50 ℃
Reaction Time: 60 min
12/09/12 2238-24-Bn on ice 60min 10uL injection
Time6.00 6.05 6.10 6.15 6.20 6.25 6.30 6.35 6.40 6.45 6.50 6.55 6.60 6.65 6.70 6.75 6.80 6.85 6.90 6.95 7.00 7.05 7.10 7.15 7.20 7.25 7.30 7.35 7.40 7.45 7.50 7.55 7.60 7.65 7.70 7.75 7.80 7.85 7.90 7.95 8.00 8.05 8.10 8.15 8.20 8.25 8.30
%
2
6.00 6.05 6.10 6.15 6.20 6.25 6.30 6.35 6.40 6.45 6.50 6.55 6.60 6.65 6.70 6.75 6.80 6.85 6.90 6.95 7.00 7.05 7.10 7.15 7.20 7.25 7.30 7.35 7.40 7.45 7.50 7.55 7.60 7.65 7.70 7.75 7.80 7.85 7.90 7.95 8.00 8.05 8.10 8.15 8.20 8.25 8.30
%
3
6.00 6.05 6.10 6.15 6.20 6.25 6.30 6.35 6.40 6.45 6.50 6.55 6.60 6.65 6.70 6.75 6.80 6.85 6.90 6.95 7.00 7.05 7.10 7.15 7.20 7.25 7.30 7.35 7.40 7.45 7.50 7.55 7.60 7.65 7.70 7.75 7.80 7.85 7.90 7.95 8.00 8.05 8.10 8.15 8.20 8.25 8.30
%
7
IS_2238_24_Bn_50_60min 1: TOF MS ES+ TIC
1.33e4
6.911548.38
6.701548.37
6.591548.35
6.361548.31
5.97500.90
7.89523.93
IS_2238_24_Bn_rt_60min 1: TOF MS ES+ TIC
2.90e4
6.891546.35
6.721546.65
6.09500.90
IS_2238_24_Bn_ice_60min 1: TOF MS ES+ TIC
4.22e4
6.881544.64
Thz-IFRQDSSSTGWN(R1)ETIVENLL-OH,
R1 = protected oligosaccharide
Synapt12/09/12 2238-24-Bn on ice 60min 10uL injection
m/z1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
%
0
100
m/z1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
%
0
100
m/z1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
%
0
100
IS_2238_24_Bn_50_60min 798 (6.906) Sm (SG, 2x2.00); Cm (792:803) 1: TOF MS ES+ 1651161.52
1161.28
1161.02
1160.78
1160.50
1160.29
1156.751156.54
1161.79
1162.01
1162.28
1162.54
1162.79
1163.02
1164.721163.49
1164.981165.591166.23
IS_2238_24_Bn_rt_60min 796 (6.889) Sm (SG, 2x2.00); Cm (792:804) 1: TOF MS ES+ 450
A: 4627.00±0.001159.75
1159.51
1159.26
1159.01
1158.76
1158.48
1160.01
1160.27
1160.53
1160.76
1161.03
1161.27
1162.45 1163.18
IS_2238_24_Bn_ice_60min 795 (6.880) Sm (SG, 2x2.00); Cm (792:799) 1: TOF MS ES+ 553
A: 4627.00±0.001158.73
1158.49
1158.23
1157.99
1159.00
1159.26
1159.51
1159.74
1160.00
1160.47
Chromatogram:
The peak remained at the same
retention time.
0 ℃
24 ℃
50 ℃
The reaction conditions for the removal of the benzyl groups were
selected according to this monitoring. (Temp.: 0 ℃, Time: ~ 60 min)
Glycopeptide : Evaluation of reaction conditions
1.50 mM NaOD,
D2O, Temp.,60 min
2. Lyophilization
(with H2O), Twice
Sample Interferon β fragment
Thz-IFRQDSSSTGWN(R1)ETIVENLL-OH,
R1 = protected oligosaccharide
Glycopeptide : Monitoring with deuterium label
Endo-M,
0.1 mM PB (pH 6.0),
35 ℃, 90 min
Temp.: 0 ℃
Synapt12/09/20 2238-40 on ice EndoM (+) 10uL injection
m/z1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
%
0
100
IS_2238_40_ice_with_EndoM 870 (7.528) Sm (SG, 2x2.00); Cm (867:876) 1: TOF MS ES+ 2.38e31315.65
1315.14
1314.65
1314.15
1316.16
1316.67
1317.18
1317.69
1318.18
1318.69
Synapt12/09/20 2238-40 rt EndoM (+) 10uL injection
m/z1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
%
0
100
IS_2238_40_rt_with_EndoM 872 (7.545) Sm (SG, 2x2.00); Cm (867:878) 1: TOF MS ES+ 1.25e31317.18
1316.67
1316.16
1315.67
1315.16
1317.67
1318.18
1318.69
1319.20
1319.69
1320.21
1320.70
Spectrum :
Calcd: [M+2H]2+ 1314.11
Found: [M+2H]2+ 1314.15
Spectrum :
Calcd: [M+2H]2+ 1314.11
Found: [M+2H]2+ 1315.16
Part of the peptide fragment labeled with deuterium
Glycoprotein
Sample Interferon β
sialyl(Bn)-IFN b-1a sialyl-IFN b-1a
ASS-006-029-6 24 degree 60min 1796-33 0.1%TFA BEH130 C18 #186003556 (0228341401)
m/z750 800 850 900 950 1000 1050 1100 1150 1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800 1850 1900 1950
%
0
100
m/z750 800 850 900 950 1000 1050 1100 1150 1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800 1850 1900 1950
%
0
100
m/z750 800 850 900 950 1000 1050 1100 1150 1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800 1850 1900 1950
%
0
100
ASS_006_029_6 1024 (8.870) Sm (SG, 2x2.00); Cm (1008:1041-(989:1004+1043:1057)) 1: TOF MS ES+ 1.45e4974.81
968.82
838.82 968.09
928.95
928.17 968.01
1012.65
1012.731113.04
1013.68
1014.36
1062.43
1113.86
1173.361116.88
1123.801173.48
1174.58 1246.77
1238.11
1184.641249.84
ASS_006_029_4 1050 (9.098) Sm (SG, 2x2.00); Cm (1039:1057-(1030:1040+1058:1064)) 1: TOF MS ES+ 1.36e41011.69
967.69
967.63
967.56
927.39927.30
890.33838.85 927.68
1112.721059.71
1012.48
1013.27
1059.87
1112.55
1059.95
1061.24
1112.39
1066.03
1066.66
1171.09
1112.95
1170.99
1170.93
1113.671114.46
1115.62
1120.08
1171.26
1171.35
1236.23
1172.21
1172.38
1176.92
1236.34
1308.881237.23
1237.33
1308.57
1309.84
1390.59
1316.37 1483.141397.66
ASS_006_029_S 1050 (9.098) Sm (SG, 2x2.00); Cm (1014:1079) 1: TOF MS ES+ 4.78e51068.24
1019.78
974.82
838.83
934.84
897.48
854.81
935.54
936.22
976.14
976.84
977.48
978.22
1020.50
1021.27
1021.86
1068.34
1121.60
1069.81
1070.54
1071.19
1072.81
1122.45 1180.59
1123.25
1124.00
1124.70
1127.39
1128.76
1181.43
1182.271246.11
1183.16
1186.58
1247.07
1247.95
ASS-006-029-4 on ice 60min 1796-33 0.1%TFA BEH130 C18 #186003556 (0228341401)
m/z990 995 1000 1005 1010 1015 1020 1025 1030 1035 1040 1045
%
0
100
m/z990 995 1000 1005 1010 1015 1020 1025 1030 1035 1040 1045
%
0
100
m/z990 995 1000 1005 1010 1015 1020 1025 1030 1035 1040 1045
%
0
100
ASS_006_029_6 1024 (8.870) Sm (SG, 2x2.00); Cm (1008:1041-(989:1004+1043:1057)) 1: TOF MS ES+ 1.42e41012.65
1011.89
1011.79
1011.74
990.781010.36
1005.071002.53991.14 1001.46
995.69 998.051008.58
1005.53
1012.73
1013.68
1014.17
1021.551016.33
1020.271017.23 1022.281025.27
1024.98
1027.06
1027.98
1030.13
ASS_006_029_4 1050 (9.098) Sm (SG, 2x2.00); Cm (1039:1057-(1030:1040+1058:1064)) 1: TOF MS ES+ 1.36e41011.69
1011.50
1010.22
1009.66998.33990.78996.76995.65
993.48
1001.86 1006.66
1004.81
1012.48
1013.27
1015.35
1024.141018.61 1019.76
1029.901025.251037.701033.041036.03 1043.19
1039.81
ASS_006_029_S 1050 (9.098) Sm (SG, 2x2.00); Cm (1014:1079) 1: TOF MS ES+ 4.37e51019.78
1019.00
990.79 1018.27
1017.511012.52
1002.23996.50991.79993.50
997.50
1000.23 1006.76 1009.93
1020.50
1021.27
1021.86
1022.64
1024.17
1025.15
1025.50
1026.55
1032.761028.521033.52
1034.52
Start
0 ℃
24 ℃
Calcd: [M+22H]22+ 1019.78
Found: [M+22H]22+ 1019.78
Calcd: [M+22H]22+ 1011.58
Found: [M+22H]22+ 1011.50
Start
0 ℃
24 ℃
Could determine the reaction conditions for glycoprotein ・Racemization of glycoprotein was also monitored by MS.
・Deprotection of glycoprotein should be carried out at 0 ℃.
Conclusion Hydrogen/Deuterium exchange (HDX)/MS has successfully revealed partial
racemization of amino acid residues during chemical synthesis of
glycopeptides and glycoproteins upon the removal of the sialic acid benzyl
groups under alkaline conditions. This system can be used to synthesize
glycopeptides/glycoproteins accurately.
J. Am. Chem. Soc. 2012, 134, 5428-5431
Calcd: [M+22H]22+ 1011.58
Found: broadening
Lyophilization (with H2O)
Twice
1.50 mM NaOD,
D2O, Temp.,60 min
2. Lyophilization
(with H2O), Twice
During the removal of the sialic acid benzyl groups under alkaline conditions, racemization
will occur.
Fully chemically-synthetic route
Chemical Synthesis of Interferon b-1a
180 min
Found: [M+3H] 3+ (1157.99)
1158.24
60 min
Found: [M+3H]3+ 1157.99
30 min
Found: [M+3H]3+ 1157.99
Spectrum:
Monitored the shift of the monoisotopic
mass with time.
Time (min)
m/z: [M+3]3+
Plot of monoisotopic’ centroid.
50 ℃:
Found: [M+3H]3+ 1160.56
24 ℃:
Found: [M+3H]3+ 1158.48
0 ℃:
Found: [M+3H]3+ 1157.99
Chromatogram (TIC): Spectrum: Calcd.:[M+3H]3+1157.98
Spectrum:
Monitored the shift of the monoisotopic
mass with temperature.
Temp.: 24 ℃
With this method, peaks will not
be visible if the reaction
conditions are unsuitable.
Deuterium attached via enolization of the carbonyl Cα-H were
monitored by this system.