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Myosins from angiosperms, ferns, and algae amplification of gene fragments with versatile PCR primers and detection of protein products with a monoclonal antibody to a conserved head epitope

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Summary

Myosins providing the motors for the actin-based motility that occurs in diverse plants have proved difficult to study. To facilitate those studies, we describe polymerase chain reaction primers that reliably amplify part of the myosin head from diverse plants, consensus sequences that characterise the amplified product as encoding a class V or class VIII myosin, and a monoclonal antibody that recognises an epitope conserved in the head of most plant, fungal, and animal myosins. A pair of stringent oligonucleotide primers was designed that, when used in the polymerase chain reaction, amplified at least eleven different myosins from five species of angiosperms and one sequence from each of the fernAzolla and the algaeNitella andPhaeodactylum. The amplified products, comprising 126 to 135 nucleotides encoding part of the myosin head domain, can be used as myosin-specific probes to screen genomic and cDNA libraries. To identify the products of plant myosin genes, we raised a monoclonal antibody (anti-CHE) to a nine amino acid peptide matching a conserved head epitope showing not more than single amino acid substitutions in most published myosin genes. This antibody recognises rabbit skeletal myosin and multiple polypeptides of >100 kDa in four angiosperms and in the algaNitella. Relating the Mr values of immunoreactive bands inArabidopsis extracts to the predicted Mr values of the products of five myosin genes supports the view that the antibody recognises both myosins V and VIII together with the products of some as yet unsequenced genes. The previously described MB170 antibodies may, in contrast, be specific for one or more type V myosins. Together, the polymerase chain reaction primers and the antibody represent versatile tools for identifying and categorising myosins in diverse plants.

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Correspondence to J. Plazinski.

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Plazinski, J., Elliott, J., Hurley, U.A. et al. Myosins from angiosperms, ferns, and algae amplification of gene fragments with versatile PCR primers and detection of protein products with a monoclonal antibody to a conserved head epitope. Protoplasma 196, 78–86 (1997). https://doi.org/10.1007/BF01281061

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