Related Experiment Videos
Partial assignment of disulfide pairs in neurophysins
S Burman1, E Breslow, B T Chait
1Department of Biochemistry, Cornell University Medical College, New York.
Biochemical and Biophysical Research Communications
|October 29, 1987
Summary
This study corrects previous findings on bovine neurophysin structure. New disulfide bond assignments reveal that the carboxyl terminal region does not form a distinct domain, revising our understanding of neurophysin
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Previous studies (Schlesinger et al., 1972) incorrectly assigned disulfide pairings in bovine neurophysins based on an erroneous amino acid sequence.
- Neurophysins are crucial proteins involved in the transport and release of peptide hormones.
Purpose of the Study:
- To re-investigate and correct the disulfide bond assignments in bovine neurophysins.
- To elucidate the structural organization of the neurophysin molecule, particularly the carboxyl terminal region.
Main Methods:
- Proteolytic fragmentation of bovine neurophysins.
- Analysis and re-assignment of disulfide bond pairings among cysteine residues.
Main Results:
- The majority of disulfide bond assignments from the original 1972 report were found to be incorrect.
- Three specific disulfide pairs were accurately assigned: Cys21-Cys44, Cys67-Cys85, and Cys74-Cys79.
- The established disulfide pairing pattern demonstrates that the variable carboxyl terminal region is not a self-contained domain.
Conclusions:
- The structural model of bovine neurophysins requires significant revision based on corrected disulfide bond assignments.
- The carboxyl terminal region, encoded by a separate gene exon, integrates into the overall protein structure rather than forming an independent domain.