title: The '30K' superfamily of viral movement proteins.
abstract: Relationships among the amino acid sequences of viral movement proteins related to the 30 kDa ('30K') movement protein of tobacco mosaic virus - the 30K superfamily - were explored. Sequences were grouped into 18 families. A comparison of secondary structure predictions for each family revealed a common predicted core structure flanked by variable N- and C-terminal domains. The core consisted of a series of beta-elements flanked by an alpha-helix on each end. Consensus sequences for each of the families were generated and aligned with one another. From this alignment an overall secondary structure prediction was generated and a consensus sequence that can recognize each family in database searches was obtained. The analysis led to criteria that were used to evaluate other virus-encoded proteins for possible membership of the 30K superfamily. A rhabdoviral and a tenuiviral protein were identified as 30K superfamily members, as were plant-encoded phloem proteins. Parsimony analysis grouped tubule-forming movement proteins separate from others. Establishment of the alignment of residues of diverse families facilitates comparison of mutagenesis experiments done on different movement proteins and should serve as a guide for further such experiments.
authors.affiliation: Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA. u-melcher-4@alumni.uchicago.edu
authors.forename: U
authors.initials: U
authors.lastname: Melcher
mesh_terms: D000595:Amino Acid Sequence; D008969:Molecular Sequence Data; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics; D053830:Plant Viral Movement Proteins; D010942:Plant Viruses / Q000737:chemistry* / Q000235:genetics / Q000502:physiology; D017433:Protein Structure, Secondary; D012328:RNA Viruses / Q000737:chemistry* / Q000235:genetics / Q000502:physiology; D016415:Sequence Alignment; D014027:Tobacco Mosaic Virus / Q000737:chemistry* / Q000235:genetics / Q000502:physiology; D014764:Viral Proteins / Q000737:chemistry* / Q000145:classification / Q000235:genetics
chemical_list: D010940:Plant Proteins; D053830:Plant Viral Movement Proteins; D014764:Viral Proteins