HIV-1 protease is an enzyme made by the HIV virus. The enzyme consists of two identical chains, each containing 99 amino acids. In each chain, amino acids 25, 26 and 27 along the sequence make up part of the active site. Which levels of protein structure determine the shape of the active site?
- Aprimary, secondary, tertiary and quaternary
- Bprimary, secondary and tertiary only
- Cprimary and quaternary only
- Dquaternary only