DISULFIDE LINKAGE OF IMMUNOTOXINS BY IGG OLIGOSACCHARIDE

Award Information
Agency: Department of Health and Human Services
Branch: N/A
Contract: N/A
Agency Tracking Number: 18950
Amount: $50,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1992
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Houston Biotechnology
3608 Research Forest Drive, The Woodlands, TX, 77381
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Peter J Kelleher
 (713) 363-0999
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE PREPARATION OF IMMUNOTOXINS COMPOSED OF RICIN A AND IMMUNOGLOBULINS HAS CLASSICALLY BEEN PERFORMED WITH HETEROBIFUNCTIONAL CROSSLINKERS SUCH AS N-SUCCINIMIDYL 3-(2-PYRIDYLDITHIO) PROPIONATE (SPDP). THESE CROSSLINKERS REACT WITH THE EPSILON-AMINO GROUPS OF LYSINE ON THE IGG MOLECULE AND THE SULFHYDRYL GROUP OF RICIN A. A COMMON DRAWBACK WITH THIS APPROACH IS THE LACK OF SPECIFIC LOCATION OF AMINO GROUPS ON THE IGG MOLECULE THAT MAY RESULT IN INAPPROPRIATE CONJUGATION LEADING TO DENATURATION OF THE ANTIBODY AND LOSS OF BINDING AFFINITY. IN THIS RESPECT THE CONJUGATION OF RICIN A TO THE FC-REGION OLIGOSACCHARIDES HAS A NUMBER OF DESIRABLE ASPECTS. THIS RESEARCH SEEKS TO SYNTHESIZE A NEW HETEROBIFUNCTIONAL CROSSLINKER AND TO DEVELOPCONJUGATION METHODS THAT UTILIZE ALDEHYDE GROUPS GENERATED FROM THE OXIDATION OF IGG CARBOHYDRATES. THE CROSSLINKER WILL PROVIDE A GROUP ON THE CARBOHYDRATES THAT CAN REACT WITH THE SULFHYDRYL GROUP OF RICIN A. THE CROSSLINKER AND CONJUGATION METHODS DEVELOPED IN THESE STUDIES WILL ALLOW THE PREPARATION OF IMMUNOTOXINS WITH LESS LOSS OF ACTIVITY THROUGH INAPPROPRIATE CONJUGATION OF AMINO GROUPS AND MORE DEFINED CHARACTERISTICS.

* information listed above is at the time of submission.

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