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Table 2 MS/MS spectral features of unadducted and HNE-adducted water buffalo (Bubalus bubalis) myoglobin peptides

From: Proteomic based approach for characterizing 4-hydroxy-2-nonenal induced oxidation of buffalo (Bubalus bubalis) and goat (Capra hircus) meat myoglobins

Peptide positiona)

Peptide sequenceb)

Modification and mass shift

Precursor m/z

b and y ions identifiedc)

17–31

VETDVAGHGQEVLIR

Unadducted

1604.83

b ions: 100.08 (b1), 229.12 (b2), 300.16 (b3), 415.18 (b4), 514.25 (b5), 585.29 (b6), 642.31 (b7), 779.37 (b8), 836.39 (b9), 964.45 (b10), 1093.49 (b11), 1192.56 (b12), 1305.64 (b13), 1418.73 (b14)

y ions: 173.10 (y1), 286.19 (y2), 399.27 (y3), 498.34 (y4), 627.38 (y5), 755.44 (y6), 812.46 (y7), 949.52 (y8), 1006.54 (y9), 1077.58 (y10), 1176.65 (y11), 1291.68 (y12), 1362.71 (y13), 1491.76 (y14)

17–31

VETDVAGHGQEVLIR

HNE + 158.1

1604.84

b ions: 100.08 (b1), 229.12 (b2), 300.16 (b3), 415.18 (b4), 514.25 (b5), 585.29 (b6), 642.31 (b7), 937.50 (b8), 994.52 (b9), 1122.58 (b10), 1251.62 (b11), 1350.69 (b12), 1463.77 (b13), 1576.86 (b14)

y ions: 173.10 (y1), 286.19 (y2), 399.27 (y3), 498.34 (y4), 627.38 (y5), 755.44 (y6), 812.46 (y7), 1107.65 (y8), 1164.67 (y9), 1235.71 (y10), 1334.78 (y11), 1449.81 (y12), 1520.84 (y13), 1649.89 (y14)

32–42

LFTGHPETLEK

Unadducted

1271.66

b ions: 114.09 (b1), 261.16 (b2), 362.21 (b3), 419.23 (b4), 556.29 (b5), 653.34 (b6), 782.38 (b7), 883.43 (b8), 996.52 (b9), 1125.56 (b10)

y ions: 145.10 (y1), 274.14 (y2), 387.22 (y3), 488.27 (y4), 617.31 (y5), 714.37 (y6), 851.43 (y7), 908.45 (y8), 1009.50 (y9), 1156.56 (y10)

32–42

LFTGHPETLEK

HNE + 158.1

1253.65

b ions: 114.09 (b1), 261.16 (b2), 362.21 (b3), 419.23 (b4), 714.42 (b5), 811.47 (b6), 940.51 (b7), 1041.56 (b8), 1154.65 (b9), 1283.69 (b10)

y ions: 145.10 (y1), 274.14 (y2), 387.22 (y3), 488.27 (y4), 617.31 (y5), 714.37 (y6), 1009.56 (y7), 1066.58 (y8), 1167.63 (y9), 1314.69 (y10)

80–87

GHHEAEVK

Unadducted

1893.90

b ions: 58.03 (b1), 195.09 (b2), 332.15 (b3), 461.19 (b4), 532.23 (b5), 661.27 (b6), 760.34 (b7)

y ions: 145.10 (y1), 244.17 (y2), 373.21 (y3), 444.25 (y4), 573.29 (y5), 710.35 (y6), 847.41 (y7)

80–87

GHHEAEVK

HNE + 158.1

1893.93

b ions: 58.03 (b1), 353.22 (b2), 490.28 (b3), 619.32 (b4), 690.36 (b5), 819.40 (b6), 918.47 (b7)

y ions: 145.10 (y1), 244.17 (y2), 373.21 (y3), 444.5 (y4), 573.29 (y5),710.35 (y6), 1005.54 (y7)

88–96

HLAESHANK

Unadducted

1253.65

b ions: 138.07 (b1), 251.15 (b2), 322.19 (b3), 451.23 (b4), 538.26 (b5), 675.32 (b6), 746.36 (b7), 860.40 (b8)

y ions: 145.10 (y1), 259.14 (y2), 330.18 (y3), 467.24 (y4), 554.27 (y5), 683.70 (y6), 754.78 (y7), 867.94 (y8)

88–96

HLAESHANK

HNE + 158.1

1253.65

b ions: 296.20 (b1), 409.28 (b2), 480.32 (b3), 609.74 (b4), 696.82 (b5), 833.96 (b6), 905.04 (b7), 1019.15 (b8)

y ions: 145.10 (y1), 259.14 (y2), 330.18 (y3), 467.24 (y4), 554.27 (y5), 683.70 (y6), 754.78 (y7), 867.94 (y8)

88–96

HLAESHANK

Unadducted

1271.66

b ions: 138.07 (b1), 251.15 (b2), 322.19 (b3), 451.23 (b4), 538.26 (b5), 675.32 (b6), 746.36 (b7), 860.40 (b8)

y ions: 145.10 (y1), 259.14 (y2), 330.18 (y3), 467.24 (y4), 554.27 (y5), 683.70 (y6), 754.78 (y7), 867.94 (y8)

88–96

HLAESHANK

HNE + 158.1

1271.66

b ions: 138.07 (b1), 251.15 (b2), 322.19 (b3), 451.23 (b4), 538.26 (b5), 833.96 (b6), 905.04 (b7), 1019.15 (b8)

y ions: 145.10 (y1), 259.14 (y2), 330.18 (y3), 625.75 (y4), 712.82 (y5), 841.94 (y6), 913.02 (y7), 1026.18 (y8)

119–133

HPSDFGADAQAAMSK

Unadducted

1514.67

b ions: 138.07 (b1), 235.12 (b2), 322.15 (b3), 437.18 (b4), 584.25 (b5), 641.27 (b6), 712.31 (b7), 827.33 (b8), 898.37 (b9), 1026.43 (b10), 1097.47 (b11), 1168.50 (b12)

y ions: 363.17 (y1), 434.21 (y2), 505.24 (y3), 633.30 (y4), 704.34 (y5), 819.37 (y6), 890.40 (y7), 947.43 (y8), 1094.49 (y9), 1209.52 (y10), 1296.55 (y11), 1393.61 (y12)

119–133

HPSDFGADAQAAMSK

HNE + 158.1

1532.68

b ions: 296.20 (b1), 393.25 (b2), 480.28 (b3), 595.67 (b4), 742.85 (b5), 799.90 (b6), 870.98 (b7), 986.07 (b8), 1057.15 (b9), 1185.28 (b10), 1256.36 (b11), 1327.44 (b12)

y ions: 363.17 (y1), 434.21 (y2), 505.24 (y3), 633.75 (y4), 704.83 (y5), 819.91 (y6), 890.99 (y7), 948.05 (y8), 1095.22 (y9), 1210.31 (y10), 1297.39 (y11), 1394.51 (y12)

148–153

VLGFHG

Unadducted

629.34

b ions: 100.08 (b1), 213.16 (b2), 270.18 (b3), 417.25 (b4), 554.31 (b5)

y ions: 74.02 (y1), 211.08 (y2), 358.15 (y3), 415.17 (y4), 528.26 (y5)

148–153

VLGFHG

HNE + 158.1

629.34

b ions: 100.08 (b1), 213.16 (b2), 270.18 (b3), 417.25 (b4), 712.91 (b5)

y ions: 74.02 (y1), 369.21 (y2), 516.28 (y3), 573.30 (y4), 686.83 (y5)

  1. a) Amino acid position in the water buffalo Mb; b) Amino acid sequence in the water buffalo Mb; c) Observed signals assigned as b or y ions. Ions showing shift in the mass by 156 Da indicating HNE adduction with respect to corresponding ions in unmodified peptides are highlighted in bold fonts
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