schrodinger.livedesign.biologics.sequence module¶

class schrodinger.livedesign.biologics.sequence.AlignedSequence(sequence: 'str', natural_analog_sequence: 'str' = None, identity: 'float' = None, similarity: 'float' = None)¶

Bases: object

sequence: str¶

natural_analog_sequence: str = None¶

identity: float = None¶

similarity: float = None¶

static fromProteinSequence(seq: schrodinger.protein.sequence.ProteinSequence, ref_seq: schrodinger.protein.sequence.ProteinSequence = None, nonstandard_symbol='X')¶

__init__(sequence: str, natural_analog_sequence: str = None, identity: float = None, similarity: float = None) → None¶

schrodinger.livedesign.biologics.sequence.get_sequence_viewer_data(mol: rdkit.Chem.rdchem.Mol, scheme: schrodinger.infra.util.AntibodyCDRScheme = AntibodyCDRScheme.Kabat)¶

Parameters: mol – rdmol to extract sequence data from
Returns: a map from polymer id to a dictionary mapping antibody regions to monomer indices in the corresponding simple polymer
Raises: RuntimeError – if the molecule contains nonlinear peptides

schrodinger.livedesign.biologics.sequence.get_annotations_for_helm_model(model: schrodinger.protein.helm._helm_parser.HelmModel, scheme: schrodinger.infra.util.AntibodyCDRScheme) → Dict[str, Dict[str, Union[Tuple[int, int], List[str]]]]¶

HelmModels reorder polymer chains to canonicalize input, which means that the same polymer can have two different polymer ids in two models if those two models contain different peptide polymers. This function goes back through a HELM model and computes the mapping between each antibody chains and its constituent region annotation.

Parameters: model – HelmModel to extract annotations for
Returns: a map from polymer id to a dictionary mapping antibody regions to monomer indices in the corresponding simple polymer.

schrodinger.livedesign.biologics.sequence.get_sequence_filter_chain_name(entity_class: schrodinger.livedesign.entity_type.EntityClass) → str¶

Simplify chain names presented in the sequence viewer filter combobox

Parameters: entity_class – the entity class of the given polymer chain
Returns: chain name to label the given entity’s sequence viewer data

schrodinger.livedesign.biologics.sequence.get_polymer_annotations(polymer: schrodinger.protein.helm._helm_parser.HelmPolymer, scheme: schrodinger.infra.util.AntibodyCDRScheme) → Tuple[str, Dict[str, Union[Tuple[int, int], List[str]]]]¶: Returns the chain ID and sequence annotations for a HelmPolymer.

schrodinger.livedesign.biologics.sequence.get_monomer_data(polymer: schrodinger.protein.helm._helm_parser.HelmPolymer) → dict[str, dict[str, Any]]¶: Returns a list of dictionaries containing monomer information for each monomer in the polymer.

schrodinger.livedesign.biologics.sequence.get_ab_annotations(fasta_sequence: str, scheme: schrodinger.infra.util.AntibodyCDRScheme) → Dict[str, Union[Tuple[int, int], List[str]]]¶: Cheap cache wrapper around antibody.SeqType to reduce the cost of calling get_annotations for each RegistrationData object.

schrodinger.livedesign.biologics.sequence.split_by_hierarchy(region_dict: Dict[str, List[int]]) → Dict[str, Dict[str, List[int]]]¶: Splits a region dictionary into a dictionary of antibody domain boundaries (e.g., VH, CH1) and a dictionary of subdomain boundaries (e.g. HFR1, H1).

schrodinger.livedesign.biologics.sequence.get_arm_indices(model: schrodinger.protein.helm._helm_parser.HelmModel) → Dict[str, int]¶: Returns a mapping from polymer id to arm pairs. If no arm pairing is provided, assignes a unique arm pair to each polymer id.

schrodinger.livedesign.biologics.sequence.align_sequences(sequences: List[List[schrodinger.protein.helm._helm_parser.HelmMonomer]], ref_seq_index: Optional[int] = None, polymer_type=PolymerType.PEPTIDE) → List[schrodinger.livedesign.biologics.sequence.AlignedSequence]¶

Returns aligned sequences as a FASTA string.

Parameters

sequences – sequences to align
ref_seq_index – if not None, all sequences are pairwise aligned using the sequence at ref_seq_index as a reference sequence
polymer_type – the type of polymer to align (Default: PEPTIDE)

Returns

FASTA string of the aligned sequences

schrodinger.livedesign.biologics.sequence.make_sequence_with_analogs(seq: List[schrodinger.protein.helm._helm_parser.HelmMonomer], polymer_type: schrodinger.protein.helm._helm_parser.PolymerType, nonstandard_symbol) → schrodinger.protein.sequence.ProteinSequence¶

Returns a ProteinSequence with nonstandard monomers replaced with their natural analogs.

Parameters

seq – sequence to replace nonstandard monomers in
polymer_type – the type of polymer to align (Default: PEPTIDE)
nonstandard_symbol – the symbol to use for nonstandard monomers

schrodinger.livedesign.biologics.sequence.get_res_type(monomer_id: str, polymer_type: schrodinger.protein.helm._helm_parser.PolymerType, nonstandard_symbol: str) → List[schrodinger.protein.residue.ResidueType]¶

Returns the ResidueType (an alignment-specific data structure) for a given monomer id. It returns one of three possible ResidueTypes: 1. the ResidueType for the monomer, if it is a standard monomer 2. the ResidueType for the natural analog of the monomer, if it is a nonstandard monomer with a natural analog in the monomer database 3. a nonstandard ResidueType with the monomer id as the symbol, if it is a nonstandard monomer without a natural analog in the monomer database

Parameters

monomer_id – the monomer id to get the residue type for
polymer_type – the type of polymer to align (Default: PEPTIDE)
nonstandard_symbol – the symbol to use for nonstandard monomers

schrodinger.livedesign.biologics.sequence.align_all_to_reference(aln: schrodinger.protein.alignment.ProteinAlignment, ref_seq_index: int, sub_matrix: dict[tuple[str, str], int] = None, **extra_args) → None¶

Aligns a given ProteinAlignment pairwise with respect to the specified reference sequence. Due to the way alignments were implemented, (see protein.alignment.BaseAlignment) ref_seq must be a sequence already in the alignment. The input ProteinAlignment is modified and not returned.

Parameters

aln – the alignment to be aligned
ref_seq_index – index corresponding to the reference sequence
sub_matrix – substitution matrix mapping pairs of amino acids to a score
extra_args – additional arguments to pass to the aligner

schrodinger.livedesign.biologics.sequence.multiple_align(aln: schrodinger.protein.alignment.ProteinAlignment) → None¶

Aligns a given ProteinAlignment via multiple sequence alignment. The input ProteinAlignment is modified and not returned.

Parameters: aln – the alignment to be aligned

schrodinger.livedesign.biologics.sequence.get_fasta_monomers(model: schrodinger.protein.helm._helm_parser.HelmModel) → List[List[schrodinger.protein.helm._helm_parser.HelmMonomer]]¶

Returns a list of sequences of monomers from a given HelmModel. Only monomers that are FASTA-compatible (nucleotides and amino acids) are included in the output.

Parameters: model – the HelmModel to get the monomers from