atom selection for nucleic acid residues

Hii all, i am new to bio3d getting thus error. my nucleic acid residues are 48 while with atoms it shows 1522. from galaxy i am able to generate the graph for all 1522 atoms but i want graph of only 48 nucleotide. please help me with this. i just want the C alpha atoms and nucleic acid residues DCCM graph. in galaxy if i want to do which kind of residues i have to select? as i select residues like residue id A, G , C, U it give error. i had attached by pdb file for the same.

read.pdb(wtpdb , multi=TRUE)

Call: read.pdb(file = wtpdb, multi = TRUE)

Total Models#: 1 Total Atoms#: 2984, XYZs#: 8952 Chains#: 1 (values: A)

 Protein Atoms#: 1462  (residues/Calpha atoms#: 94)
 Nucleic acid Atoms#: 1522  (residues/phosphate atoms#: 48)

 Non-protein/nucleic Atoms#: 0  (residues: 0)
 Non-protein/nucleic resid values: [ none ]

Protein sequence: GSSGSSGMSGGLAPSKSTVYVSNLPFSLTNNDLYRIFSKYGKVVKVTIMKDKDTRKSKGV AFILFLDKDSAQNCTRAINNKQLFGRVIKASIAI

Nucleic acid sequence: AUUAAAGACCAACCAACUUCUGUUCUCUAAACGAACUUUAAAUUAAUA

attr: atom, xyz, calpha, call

p.inds <- atom.select(wtpdb, "phosphates") Error in UseMethod("atom.select") : no applicable method for 'atom.select' applied to an object of class "character" sele = atom.select(wtpdb, "protein") Error in UseMethod("atom.select") : no applicable method for 'atom.select' applied to an object of class "character" sele = atom.select(wtpdb, "protein") Error in UseMethod("atom.select") : no applicable method for 'atom.select' applied to an object of class "character" pdb <- read.pdb('wtpdb') Error in read.pdb("wtpdb") : No input PDB file found: check filename

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