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Originally published In Press as doi:10.1074/mcp.M100007-MCP200 on October 12, 2001.
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Molecular & Cellular Proteomics 1:46-59, 2002.
© 2002 by The American Society for Biochemistry and Molecular Biology, Inc.

Research

The Chloroplast Grana Proteome Defined by Intact Mass Measurements from Liquid Chromatography Mass Spectrometry*

Stephen M. Gómez{ddagger},§, John N. Nishio{ddagger}, Kym F. Faull§ and Julian P. Whitelegge§,¶

§ The Pasarow Mass Spectrometry Laboratory, Department of Psychiatry and Biobehavioral Sciences, The Neuropsychiatric Institute and the Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095
{ddagger} Department of Botany, University of Wyoming, Laramie, Wyoming 82071

Proteomics seeks to address the entire complement of protein gene products of an organism, but experimental analysis of such complex mixtures is biased against low abundance and membrane proteins. Electrospray-ionization mass spectrometry coupled with reverse-phase chromatography was used to separate and catalogue all detectable proteins in samples of photosystem II-enriched thylakoid membrane subdomains (grana) from pea and spinach. Around 90 intact mass tags were detected corresponding to approximately 40 gene products with variable post-translational covalent modifications. Provisional identity of 30 of these gene products was proposed based upon coincidence of measured mass with that calculated from genomic sequence. Analysis of isolated photosystem II complexes allowed detection and resolution of a minor population of D1 (PsbA) that was apparently palmitoylated and not detected in less purified preparations. Based upon observed +80-Da adducts, D1, D2 (PsbD), CP43 (PsbC), two Lhcbs, and PsbH were confirmed to be phosphorylated, and a new phosphoprotein was proposed to be the product of psbT. The appearance of a second +80-Da adduct on PsbH provides direct evidence for a second phosphorylation site on PsbH, complicating interpretation of its role in regulation of thylakoid membrane organization and function, including light-state transitions. Adducts of +32 Da, presumably arising from oxidative modification during illumination, were associated with more highly phosphorylated forms of PsbH implying a relationship between the two phenomena. Intact mass proteomics of organellar subfractions and more highly purified protein complexes provides increasingly detailed insights into functional genomics of photosynthetic membranes.

To whom correspondence should be addressed: The Pasarow Mass Spectrometry Laboratory, Dept. of Chemistry and Biochemistry, UCLA, 405 Hilgard Ave., Los Angeles, CA 90095. Tel.: 310-206-7886; Fax: 310-206-2161; E-mail: jpw{at}chem.ucla.edu.


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