Q-TOF MS/MS : de-novo sequencing

1
Q-TOF MS/MS de-novo sequencing
Tip 1. Generally, Q-TOF ESI-MS shows multiple
charged ions in the mass spectrum e.g.
729(2) m/z ? m/z 729.8 M2H/2 ?
M(729.8x2)-21457.6 2. MS/MS fragmented
ions next page 3. Leu(L)Ile(I) and
Phe(F)Met(M) oxidation have the same MW
It means that L or F can be replaced with I
or M, respectively.
y ions
2
Fragmentation of Peptides
3
2D 17184448 (spot No.) 710(3) (M3H3) -
NLLLQGDAHLDPNVLQLTR (estimated sequen.)
4
2D 17184448 729(2) - VLAVEMDTFMDR
5
2D 17184448 895(2) - LQGDAHLDPNDPQLTR
6
2D 162627 ?
2D 2627
2D 16
7
2D 30 794(2) - VGSYQGEELYAPFK
8
2D 33 1012(2) - DLSQDDGLVPLVEEL
9
2D 3638 1194(2) - NGDLTTLADVVELK
10
2D 3943 1102(3) - TSDLGDPNYPHLGLDYF
11
2D 54 842(2) - NTVDDGSPLLLSSPLR
12
2D 54 870(2) - LLVATEDNPFVVMFK
13
2D 6061 627(2) - MLGLFNDASDR
14
2D 71 960(2) - WAMoxLGALGCVF
15
2D 74 704(2) - LTYYTPEYETK
16
2D 77 998(2) VMPGLLNSSPN(?)
17
2D 79 727(2) WLSMQVARVVHK
18
2D 213379 have same peptide m/z 727 (MW1454)
- aldolase
2D 33
2D 21
2D 79