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Table 1 Peptide sequences of gp114 derived from MS/MS spectra. Peptide sequences from gp114 produced by the interpretation of MS/MS spectra and MS BLAST alignments with corresponding peptides. X are unidentified amino acid residues, L stands for both Leu and Ile residues; B stands for a generic trypsin cleavage site (Arg or Lys); sequences in brackets present isobaric combinations of amino acid residues, which could not be distinguished because of the absence of the corresponding fragment ions in the mass spectrum. All peptide sequence candidates from all fragmented precursors were merged into a single MS BLAST search string. Multiple sequence candidates per each fragmented precursor were allowed. Peptides 2, 4, 5, 3 and 6 (underlined) are contained in one putative exon derived from sequence FE8.

From: Identification of glycosylated marker proteins of epithelial polarity in MDCK cells by homology driven proteomics

#

m/z

z

m

Sequence proposal

Alignment

Protein homologue

1

1185.6

3

3553.8

SNVLYGPDTPTLSQSLGNS

Query: NVLYGPDTPTLSQS

CEACAM8

     

NVLYGPD PT+S S

P31997

     

Sbjct: NVLYGPDAPTISPS

H. sapiens

2

693.3

3

2076.9

BXXTVESVPPNAAEGKDALLR

Query: TVESVPPNAAEGKDALL

CEACAM8

 

1039

2

  

T+E VP NAAEGK+ LL

P31997

     

Sbjct: TIEAVPSNAAEGKEVLL

H. sapiens

3

553.2

2

1104.4

BVTTPGPAYSGR

Query: TPGPAYSGR

CEACAM8

     

TPGPAYS R

P31997

     

Sbjct: TPGPAYSNR

H. sapiens

4

656.8

4

2623.2

B [VL]LPGDTASLTWFK [W/GE/AD/SV]TVLPXXK

Query: WFKGETV

CEACAM8

 

875.4

3

  

W+KGETV

P31997

     

Sbjct: WYKGETV

H. sapiens

5

539.2

2

1076.4

BLLLYVLDTK

Query: BLLLYVLDT

Q9NOP7

     

+++ YV+ T

CEA protein

     

Sbjct: RIIGYVIAT

P. hamadryas

6

425.2

2

848.4

BFETALLR

No match

 

7

386.2

2

770.4

BTVPDSPR

No match

 
  1. FE8 putative exon
  2. SLLAFWNPPTTAQVTVESVPPNAAEGKDALLR VLNLPGDTASLTWFKGETVLP THKILLYVIDTK ITTPGPAYSGR ETIY PNGSLLFQNITLNDTGSYILQIINQKFETAL VRGQLQVFRE