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Table 2 Phosphorylated peptides quantified

From: Tau protein profiling in tauopathies: a human brain study

Measured peptide

Extended-peptide standarda

Phosphate locations

Extended peptide sequenceb

175-190-p1

170-195-p181

T181

RIPAKTPPAPK[T]PPSSGEPP(K)SGDRS

195-209-p1c

190-214-p202

S202

KSGDRSGYSSPG[S]PGTPGS(R)SRTPS

190-214-p205

T205

KSGDRSGYSSPGSPG[T]PGS(R)SRTPS

195-209-p2

190-214-p202 + 205

S202 + T205

KSGDRSGYSSPG[S]PG[T]PGS(R)SRTPS

210-224-p1

205-229-p217

T217

TPGSRSRTPSLP[T]PPTREP(K)KVAVV

210-224-p2

205-229-p212 + 217

T212 + T217

TPGSRSR[T]PSLP[T]PPTREP(K)KVAVV

210-224-p3d

Same as for 210-224-p2

212-224-p1e

205-229-p217

T217

TPGSRSRTPSLP[T]PPTREP(K)KVAVV

225-240-p1

220-245-p231

T231

TREPKKVAVVR[T]PPKSPSSA(K)SRLQT

225-240-p2c

220-245-p231 + 235

T231 + S235

TREPKKVAVVR[T]PPK[S]PSSA(K)SRLQT

220-245-p231 + 237

T231 + S237

TREPKKVAVVR[T]PPKSP[S]SA(K)SRLQT

220-245-p231 + 238

T231 + S238

TREPKKVAVVR[T]PPKSPS[S]A(K)SRLQT

225-240-p3c

220-245-p231 + 235 + 237

T231 + S235 + S237

TREPKKVAVVR[T]PPK[S]P[S]SA(K)SRLQT

220-245-p231 + 235 + 238

T231 + S235 + S238

TREPKKVAVVR[T]PPK[S]PS[S]A(K)SRLQT

220-245-p231 + 237 + 238

T231 + S237 + S238

TREPKKVAVVR[T]PPKSP[S][S]A(K)SRLQT

386-406-p1c

379-411-p396

S396

RENAKAKTDHGAEIVYK[S]PVVSGDTSP(R)HLSNV

379-411-p404

S404

RENAKAKTDHGAEIVYKSPVVSGDT[S]P(R)HLSNV

386-406-p2

379-411-p396 + 404

S396 + S404

RENAKAKTDHGAEIVYK[S]PVVSGDT[S]P(R)HLSNV

386-406-p3

Same as for 396-406-p2

407-438-p1d

[U-15N]-labelled non-phosphorylated 407–438

…HLSNVSSTGSIDMVDSPQLATLADEVSASLAK…[U-15N]

407-438-p2d

407-438-p3d

  1. a Numbering according to tau 2N4R
  2. b [X] amino acid with phosphate group, (X) isotope labelled amino acid; [13C6,15N2-Lys] or [13C6,15N4-Arg]; black letters are expected peptide after trypsination (based on experiments) and red letters are extended sequence parts
  3. c Labelled standards had the same retention time and since quantification was performed with the intact peptide no distinction was made for different phosphate locations, just the number of phosphate groups
  4. d For these peptides no specific standards were obtained so in these cases surrogate standards were used
  5. e Depending on phosphate location different tryptic peptides were produced, cf. 210-224-p1