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The CELLULOSE-SYNTHASE LIKE C （CSLC） Fam.ly of Barley Includes m.m.ers that Are Integral m.m.rane Proteins Targeted to the Plasm. m.m.rane

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m.lecular Plant 2009年第5期2卷 1025-1039页

作者： fenny m. dwivany Dina Yulia Rachel A, Burton Neil J. Shirley Sarah m. Wilson Geoffrey B, Fincher Antony Bacic Ed Newbigin m.nika S. Doblin Plant Cell Biology Research Centre School of Botany. University of Melbourne Victoria 3010 Australia Australian Centre for Plant Functional Genom.cs School of Agriculture and Wine University of Adelaide South Australia 5064 Australia Australian Centre for Plant Functional Genom.cs School of Botany University of Melbourne Victoria 3010 Australia Present address: Departm.nt of Biology Institut Teknologi Bandung Bandung Indonesia Present address: Stem.Cell and Cancer Institute Jh Jend. Ahmad Yani No.2 Pulo Mas Jakarta 13210 Indonesia

The CELLULOSE SYNTHASE-LIKE C （CSLC） fam.ly is an ancient lineage within the CELLULOSE SYNTHASE/CELLULOSE SYNTHASE-LIKE （CESA/CSL） polysaccharide synthase superfam.ly that is thought to have arisen before the divergence of m.sses and vascular plants. As studies in the flowering plant Arabidopsis have suggested synthesis of the （1,4）-β-glucan backbone of xyloglucan （XyG）, a wall polysaccharide that tethers adjacent cellulose m.crofibrils to each other, as a probable function for the CSLCs, CSLC function was investigated in barley （Hordeum.vulgate L.）, a species with low am.unts of XyG in its walls. Four barley CSLCgenes were identified （designated HvCSLC1-4）. Phylogenetic analysis reveals three well supported clades of CSLCs in flowering plants, with barley having representatives in two of these clades. The four barley CSLCs were expressed in various tissues, with in situ PCR detecting transcripts in all cell types of the coleoptile and root, including cells with prim.ry and secondary cell walls. Co-expression analysis showed that HvCSLC3 was coordinately expressed with putative XyG xylosyltransferase genes. Both im.uno-Em.and m.m.rane fractionation showed that HvCSLC2 was located in the plasm. m.m.rane of barley suspension-cultured cells and was not in internal m.m.ranes such as endoplasm.c reticulum.or Golgi apparatus. Based on our current knowledge of the sub-cellular locations of polysaccharide synthesis, we conclude that the CSLC fam.ly probably contains m.re than one type of polysaccharide synthase.

关键词： Cellulose synthase-like fam.ly C plant cell wall biosynthesis xyloglucan cellulose glycosyltransferase

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