Hanson D D, Hamilton D A, Travis J L, Bashe D M, Mascarenhas J P
Department of Biological Sciences, State University of New York, Albany 12222.
Plant Cell. 1989 Feb;1(2):173-9. doi: 10.1105/tpc.1.2.173.
A pollen-specific cDNA clone, Zmc13, has been isolated from a cDNA library constructed to poly(A) RNA from mature maize pollen. The cDNA as shown by primer extension analysis is a full-length copy of the mRNA. The cDNA has been sequenced and is 929 nucleotides in length plus a 47-nucleotide poly(A) tail. Putative polyadenylation signals are identifiable in the 3'-nontranslated region. The mRNA codes for a predicted polypeptide containing 170 amino acid residues and with a molecular mass of 18.3 kilodaltons. The hydropathy profile suggests a possible signal sequence on the amino terminus. A comparison of the nucleotide and deduced amino acid sequence with sequences in data banks has not shown homology to known molecules. In situ hybridizations using RNA probes show that the mRNA is located in the cytoplasm of the vegetative cell of the pollen grain and after germination is distributed throughout the pollen tube cytoplasm.
从一个以成熟玉米花粉的聚腺苷酸RNA构建的cDNA文库中分离出了一个花粉特异性cDNA克隆Zmc13。引物延伸分析表明该cDNA是mRNA的全长拷贝。该cDNA已被测序,长度为929个核苷酸,加上一个47个核苷酸的聚腺苷酸尾巴。在3'-非翻译区可识别出推定的聚腺苷酸化信号。该mRNA编码一个预测的含有170个氨基酸残基、分子量为18.3千道尔顿的多肽。亲水性图谱表明在氨基末端可能存在信号序列。将核苷酸和推导的氨基酸序列与数据库中的序列进行比较,未发现与已知分子的同源性。使用RNA探针进行的原位杂交表明,该mRNA位于花粉粒营养细胞的细胞质中,萌发后分布于整个花粉管细胞质中。