The Raman detection of peptide tyrosine phosphorylation.
Drop-coating-deposition-Raman (DCDR) is used to detect spectral changes induced by phosphorylation of tyrosine amino acid residues in peptides. Four peptides are investigated, with sequences derived from the human protein-tyrosine kinase, p60c-src, with Y-216, Y-419, and Y-530 phosphorylation sites. Although the spectra of the four peptides are quite different, tyrosine phosphorylation is found to invariably induce the collapse of a doublet at 820-850cm(-1) and the attenuation of a peak around 1205cm(-1). Moreover, amide III band shifts suggest that tyrosine phosphorylation may promote beta sheet formation, particularly in peptides that lack phenylalanine residues. The degree of tyrosine phosphorylation in peptide mixtures is determined using DCDR combined with partial least squares multivariate calibration with a 2% root mean standard error of prediction.
Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
Yong
Y
Xie
Dongmao
D
Zhang
Gotam K
GK
Jarori
V Jo
VJ
Davisson
Dor
D
Ben-Amotz
D000595:Amino Acid Sequence; D006801:Humans; D008969:Molecular Sequence Data; D015688:Oncogene Protein pp60(v-src) / Q000737:chemistry / Q000378:metabolism; D010446:Peptide Fragments / Q000737:chemistry / Q000378:metabolism*; D010766:Phosphorylation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014443:Tyrosine / Q000378:metabolism*
D010446:Peptide Fragments; D014443:Tyrosine; D015688:Oncogene Protein pp60(v-src)