Bereich Zellbiologie, Proteasen und Apoptose:

Than ME, Helm M, Simpson DJ, Lottspeich F, Huber R und Gietl C (2004)  The 2.0 Å crystal structure and substrate specificity of the KDEL- tailed cysteine endopeptidase functioning in programmed cell death of Ricinus communis endosperm.  J. Mol. Biol. 336: 1103-1116.

Greenwood JS, Helm M und Gietl C (2005) Ricinosomes and endosperm transfer cell structure in programmed cell death of the nucellus during Ricinus seed development. Proc. Natl. Acad. Sci. U.S.A. 102: 2238-2243. doi: 10.1073/pnas.0409429102

Helm M, Lück C, Prestele J, Hierl G, Huesgen PF, Fröhlich T, Arnold GJ, Adamska I, Görg A, Lottspeich F und Gietl C. (2007) Dual specificities of the glyoxysomal/ peroxisomal processing protease Deg15 in higher plants. Proc. Natl. Acad. Sci. U.S.A. 104: 11501-11506. doi:  10.1073/pnas.0704733104

Helm M, Schmid M , Hierl G, Terneus K, Tan L, Lottspeich F, Kieliszewski MJ und Gietl C (2008) KDEL-tailed cysteine endopeptidases involved in programmed cell death, intercalation of new cells and dismantling of extensin scaffolds. Am. J. Bot. 95: 1049-1062. doi: 10.3732/ajb.2007404.

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