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Table 1 Putative peptide or EGS-crosslinked peptides identified from complete trypsinolysis of EGS-crosslinked HbII.

From: Quaternary structure of Artemia haemoglobin II: analysis of T and C polymer alignment and interpolymer interface

Mass/charge ratio (m/z)

Charge statea

Putative peptide species

  

(Peptide assignment receiving best SearchXlinks score)

  

Peptide 1b

Polymer, Domainc

Peptide 2b

Polymer, Domainc

SXL Score

Noted

626.462f

+2

715-FSSIGK-720

TP, Domain 5

883-QLK-885

TP or CP, Domain 6

11.5

XLP

648.457

+2

738-EHIK R-742

TP or CP, Domain 5

883-QLK-885

TP or CP, Domain 6

6.0

XLP

927.400e,f

+1

931-GFK-933

TP, Domain 6

931-GFK-933

CP, Domain 6

21.0

XLP

983.462

+1

1138-IFTKVFTK-1145

TP, Domain 8

-

-

10.0

UmP

1273.996

+1

68-NIPASELASSER-79

TP, Domain 1

-

-

16.0

UmP

1405.492

+1

672-VFAK-675

TP or CP, Domain 5

742-RGLSRK-747

TP or CP, Domain 5

11.5

XLP

1418.573e,f

+1

301-ASWNK-305

TP or CP, Domain 2

29-ATIK R-33

TP or CP, Domain 1

130.5

XLP

1542.509f

+1

1016-HAISVTTK-1023

TP or CP, Domain 7

493-EAIK-496

CP, Domain 4

153.0

XLP

Mass/charge ratio (m/z)

Charge state a

Mass/charge Ratio Expected (m/z)

Total Possible Peptide Assignment

    

626.462f

+2

626.323

6

    

648.457

+2

648.348

7

    

927.400e,f

+1

927.446

1

    

983.462

+1

983.593

5

    

1273.996

+1

1273.639

17

    

1405.492

+1

1405.780

20

    

1418.573e,f

+1

1418.727

5

    

1542.509f

+1

1541.806

38

    
  1. a Charge state of the peaks were inferred from the ESI-MS zoom scan data obtained. The inferred charged states were confirmed by consulting the PMF.
  2. b Crosslinked lysines were in bold.
  3. c TP, T polymer; CP, C polymer.
  4. d XLP, EGS-crosslinked peptides; UmP, unmodified peptide.
  5. e Statistical significances of b and y-type ion matchings were measured for these peaks (See also Table 2).
  6. f Further identifications of peaks remaining unannotated after SearchXlinks scoring were done for these peaks, and afterwards a majority of significant peaks were identified. [See Additional file 1, 2, 3, 4]