Plant Physiol. Illumina
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Purification and cDNA Cloning of Maize Poly(ADP)-Ribose Polymerase

Pramod B. Mahajan* and Zhuang Zuo

Department of Crop Protection, Trait and Technology Development, Pioneer Hi-Bred International, Johnston, Iowa 50131

Poly(ADP)-ribose polymerase (PADPRP) has been purified to apparent homogeneity from suspension cultures of the maize (Zea mays) callus line. The purified enzyme is a single polypeptide of approximately 115 kD, which appears to dimerize through an S-S linkage. The catalytic properties of the maize enzyme are very similar to those of its animal counterpart. The amino acid sequences of three tryptic peptides were obtained by microsequencing. Antibodies raised against peptides from maize PADPRP cross-reacted specifically with the maize enzyme but not with the enzyme from human cells, and vice versa. We have also characterized a 3.45-kb expressed-sequence-tag clone that contains a full-length cDNA for maize PADPRP. An open reading frame of 2943 bp within this clone encodes a protein of 980 amino acids. The deduced amino acid sequence of the maize PADPRP shows 40% to 42% identity and about 50% similarity to the known vertebrate PADPRP sequences. All important features of the modular structure of the PADPRP molecule, such as two zinc fingers, a putative nuclear localization signal, the automodification domain, and the NAD+-binding domain, are conserved in the maize enzyme. Northern-blot analysis indicated that the cDNA probe hybridizes to a message of about 4 kb.

*   Corresponding author; e-mail mahajanp{at}phibred.com; fax 1-515-270-3444.

Plant Physiol. (1998) 118: 895-905
Copyright Clearance Center:   0032-0889/98/118//11
© 1998 American Society of Plant Physiologists




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