Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Four different parts of chain A are involved. The A-chain helix over the reaction face (green) does not continue as chain A extends along the NH3 path from Cys62A to Ser52A. The α-helix of chain B (red) is near the NH3 pathway only at Glu93, then chain B loops back to flank the NH3 pathway near Met118.
