Antibody Choices

Leader sequences

Chicken Lysozyme

Chicken lysozyme derives from chicken egg white.  Breaks down bacterial cell walls.

mAb name:  HyHEL-10

Sequence:  this paper

Binding interactions: this paper (interacts with discontinuous parts of peptide)

Peptide sequence: UniProt

Cross-checked peptide sequence with antibody binding interaction sites.  None of those sites have known variants/mutations.  However, peptide numbering is different on UniProt and in binding interactions paper (18aa difference).

Peptide suppliers:

Sigma-Aldrich:  1g/$49.50

Merck-Millipore:  1g/$39

HBV Surface Antigen

1g/$39

HIV1 gp120 (HIV envelope glycoprotein)

gp120 is a glycoprotein derived from gp160.  gp160 is processed into gp120 and gp41, which together form a complex that binds to CD4, permitting the fusion of viral and cell membranes.

gp120 antibodies review

mAb database:  HIV Molecular Immunology 2002 (same as this)

mAb name:  0.5beta

Sequence:  IMGT

Epitope (recognition sequence):

IMGT:  RKSIRIQRGPGRAFVTIG

HIV molecular immunology database:  RGPGRAFVTIG

Peptide suppliers:

Full-length gp120 peptides are not readily available.  Check the manufacturing details to ensure that the epitope is included in the peptide.  Also check that peptide comes glycosylated.

Abcam:  10ug/$228

MyBioSource:  50ug/$365

**PROBLEM:  These have the amino acid sequence RKRIRIQRGPGRAFVTIG

Sequence data:  NCBI, UniProt

Serine residue does contribute to binding:  0.5beta binding interactions.pdf

Tried testing binding in silico:

Performed in silico mutation using Swiss PDB Viewer:  S234R, where 234 is PDB residue number (contained in peptide P) corresponding to S residue in RKSIRIQRGPGRAFVTIG

Energy minimization with Python code from 20.320 using PyRosetta:

Looking more closely at PDB file SPV didn't add hydrogens with the mutation  - how to fix this?