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Molecular Plant Advance Access originally published online on June 23, 2008
Molecular Plant 2008 1(4):634-644; doi:10.1093/mp/ssn018
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© The Author 2008. Published by the Molecular Plant Shanghai Editorial Office in association with Oxford University Press on behalf of CSPP and IPPE, SIBS, CAS.

New microsome-associated HT-family proteins from Nicotiana respond to pollination and define an HT/NOD-24 protein family

Katsuhiko Kondo and Bruce McClure*

Department of Biochemistry, Interdisciplinary Plant Group, and the Christopher S. Bond Life Sciences Center, University of Missouri, MI, USA

* To whom correspondence should be addressed: E-mail mcclureb{at}missouri.edu

HT-family proteins have been identified in Nicotiana, Solanum, and Petunia. HT-B-type proteins are implicated in S-RNase-based self-incompatibility, but the functions of other family members are unknown. Screening for cDNA sequences with an expression pattern similar to HT-B in Nicotiana alata revealed a new group of small HT-family proteins, designated HT-M. HT-M proteins resemble HT-B in several respects: their pistil-specific expression pattern is indistinguishable from HT-B, they pellet with a microsome fraction, and their abundance decreases after pollination. Unlike HT-B, there is no S-specificity to this response, and RNAi experiments show that HT-M proteins are not necessary for self-incompatibility. Identification of a third group of pistil-specific HT-family proteins helps better define the characteristics of the family and allowed identification of putative new family members. By searching the databases with only the most conserved HT-family sequence elements, the signal sequence and cysteine motifs, we identified nodulin-24-like proteins and several small glycine-rich proteins as putative HT-family members. Like HT-M and HT-B, nodulin-24 is membrane associated. We propose that the conserved features in HT-family proteins are important for targeting or modification and refer to the broader family that includes both HT- and nodulin-24-like proteins as the HT/NOD-24-family.


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