Short answer: there isn’t a single “heparin biosynthetic pathway patent.” The area is spread across multiple patent families focused on different approaches to making heparin/heparan sulfate (HS) or HS-like polysaccharides, often via chemoenzymatic routes or recombinant/biotechnological production. If you’re evaluating patent landscape or freedom-to-operate, you’ll want to search several overlapping families rather than one patent.
What kinds of patents you’re likely to see
- Chemoenzymatic synthesis patents: starting from heparosan (often from E. coli K5) and using a suite of sulfotransferases and epimerases to install specific sulfation patterns.
- Enzyme toolkit patents: covering genes, proteins, and methods for NDST (N-deacetylase/N-sulfotransferase), 2-O-, 3-O-, 6-O-sulfotransferases, C5-epimerase, and related enzymes, as well as their expression, purification, and use in synthesis.
- Biosynthetic production patents: methods to produce heparosan or HS-like polymers in microbial or cell-free systems, including fermentation, bioconversion, and downstream processing.
- Substrate and process patents: starting materials (e.g., heparosan), intermediate oligosaccharides, and defined process steps to achieve scalable, controlled sulfation.
- Purification, quality control, and composition patents: assays, purification steps, and defined product compositions (e.g., specific sulfation patterns or molecular weight distributions).
How to search effectively
- Jurisdiction: US, Europe (EP), WIPO (PCT), China (CN), Japan (JP) are common. If you need, I can tailor a search plan for a specific jurisdiction.
- Databases: Google Patents, Espacenet (European Patent Office), USPTO, WIPO PATENTSCOPE, CNIPA, JPO.
- Keywords and synonyms:
- “chemoenzymatic synthesis” AND “heparan sulfate” OR “heparin”
- “heparosan” AND “sulfotransferase”
- “NDST” OR “N-sulfotransferase” AND “heparin”
- “2-O-sulfotransferase” OR “6-O-sulfotransferase” OR “3-O-sulfotransferase”
- “C5-epimerase” AND “heparin” OR “heparan sulfate”
- “biosynthesis” AND “heparin” OR “heparan sulfate”
- “K5 polysaccharide” OR “heparosan” AND “production” OR “fermentation”
- Look for families rather than single documents, and check for continuations, international filings (PCT), and family members in other jurisdictions.
- Inspect claim scope: are they about enzymes themselves, production in a host, in vitro enzymatic cascades, starting material, or the final product?
What I can do for you
- If you tell me your target jurisdiction and time frame (e.g., US only, or worldwide; last 10 years vs. entire history), I can sketch a focused, preliminary list of relevant patent families and summarize their likely claim scopes.
- I can help draft targeted search strings and organize results into families with status (granted vs. application), assignees, and key claim themes.
- I can also help assess potential freedom-to-operate considerations at a high level, though for legal opinions you’d want a patent attorney.
If you want, tell me:
- Which jurisdictions you care about
- Whether you want granted patents, applications, or both
- Any known players or institutions (universities, biotech companies) you’re particularly interested in
I can then give you a structured overview or start a targeted search plan.