Table II.

PAD incubation of CXC and CC chemokines

Chemokine
NH2-terminal sequencea
Enzyme
E/Sb
Incubation timec
Percentage first Citd
Percentage second Citd
Mr shifte
CXCL5 AGPAAAVLRELRCVCrabbit PAD 1/20 90 89.8 + 1.0 
  hu PAD2 1/200 120 14.0 + 0.4 
  hu PAD4 1/200 120 35.1 + 0.6 
CXCL8 AVLPRSAKELRCQCrabbit PAD 1/20 90 100 + 1.1 
  hu PAD2 1/200 120 88.0 ND 
  hu PAD4 1/200 120 94.5 + 1.0 
CCL17 ARGTNVGRECChu PAD2 1/200 120 24.8 22.6 + 0.8 
  hu PAD4 1/200 120 92.1 54.3 + 2.4 
CCL26 TRGSDISKTCChu PAD 1/200 120 17.1 ND + 0.2 
  hu PAD4 1/200 120 17.8 ND + 0.2 
  hu PAD4 1/40 120 100 ND + 1.3 
Chemokine
NH2-terminal sequencea
Enzyme
E/Sb
Incubation timec
Percentage first Citd
Percentage second Citd
Mr shifte
CXCL5 AGPAAAVLRELRCVCrabbit PAD 1/20 90 89.8 + 1.0 
  hu PAD2 1/200 120 14.0 + 0.4 
  hu PAD4 1/200 120 35.1 + 0.6 
CXCL8 AVLPRSAKELRCQCrabbit PAD 1/20 90 100 + 1.1 
  hu PAD2 1/200 120 88.0 ND 
  hu PAD4 1/200 120 94.5 + 1.0 
CCL17 ARGTNVGRECChu PAD2 1/200 120 24.8 22.6 + 0.8 
  hu PAD4 1/200 120 92.1 54.3 + 2.4 
CCL26 TRGSDISKTCChu PAD 1/200 120 17.1 ND + 0.2 
  hu PAD4 1/200 120 17.8 ND + 0.2 
  hu PAD4 1/40 120 100 ND + 1.3 
a

NH2-terminal Arg residues are indicated in bold, cysteine motifs are underlined.

b

Molar Enzyme/Substrate ratio.

c

Incubation time in minutes.

d

Percentages of conversion of NH2-terminal Arg residues to Cit were determined by Edman degradation.

e

Shift compared to the theoretical average Mr of the uncitrullinated chemokine as determined by ion trap mass spectrometry.

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