How cheese-making enzyme knows where to cut milk protein
Peptide substrates for chymosin (rennin). Interaction sites in kappa-casein-related sequences located outside the (103-108)-hexapeptide region that fits into the enzyme's active-site cleft.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
His-102 is functionally important, but not irreplaceable — substituting it with Pro or Lys reduces cleavage, yet some activity remains.
Earlier studies suggested one histidine might be the primary anchor; this shows redundancy and resilience in the system.
Practical Takeaways
Cheese producers could design better enzymes or milk proteins by preserving His/Pro/Lys motifs for more efficient curdling.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
His-102 is functionally important, but not irreplaceable — substituting it with Pro or Lys reduces cleavage, yet some activity remains.
Earlier studies suggested one histidine might be the primary anchor; this shows redundancy and resilience in the system.
Practical Takeaways
Cheese producers could design better enzymes or milk proteins by preserving His/Pro/Lys motifs for more efficient curdling.
Publication
Journal
The Biochemical journal
Year
1987
Authors
S. Visser, C. Slangen, P. J. VAN ROOIJEN
Related Content
Claims (6)
Rennet cuts a protein on milk's tiny particles, making them clump together and turn into cheese curds.
In a specific part of a milk protein, both the histidine and proline building blocks help an enzyme called chymosin do its job in lab tests, and neither one is more important than the others.
Some specific parts of a milk protein help it stick in the right spot on an enzyme, making it easier to cut and activate in lab tests.
In milk protein, certain 'Pro' building blocks act like tiny braces that hold the protein in the right shape so an enzyme can cut it cleanly at a specific spot in a lab setting.
Changing one specific building block (histidine) in a lab-made milk protein makes it harder for an enzyme to cut it, which suggests that spot is important for the enzyme to recognize its target.