Production of Chimeric Heavy-Chain Antibodies
Bibliographic record
Abstract
Antibody has become a major category of therapeutics. However, IgG, the primary molecular format of existing antibody drugs, has some major shortcomings such as undesirable pharmacokinetics, high dose requirement, and high production cost, partially due to its large molecular size. Much efforts have been made to address these issues, which usually led to antibodies or antibody fragments with smaller size. However, in most cases these changes also resulted in complete or partial deletion of fragment crystallizable (Fc), which is known to be crucial for a long serum half-life through binding to FcRn and antibody-mediated cell killing through binding to Fcgamma receptors and complement. Single-domain antibodies (sdAbs) derived from camelid heavy-chain antibodies (HCAbs) provide an excellent building block for constructing antibodies with moderate size yet with an intact Fc. We describe in this chapter the construction, production, and purification of chimeric HCAbs (cHCAbs), that is, fusion of camelid sdAb to human Fc. The cHCAb has a molecular size approximately half that of IgG (80 kDa vs. 150 kDa). Production is achieved through a transient expression with a human embryonic kidney (HEK) expression system, which can rapidly provide hundreds of milligrams to low-gram quantities of soluble and glycosylated recombinant antibodies for early-stage drug development.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".