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.
Fig. 3. Structural alignment of the conserved catalytic domains of (A) A.fulgidus CCA-adding enzyme (N-terminal domain), (B) bovine poly(A) polymerase (N-terminal domain), (C) B.stearothermophilus CCA-adding enzyme (Head domain) and (D) human pol β (Palm domain). The α-helices and β-strands are colored pink and blue, respectively. Three catalytic carboxylates are displayed. Metal ions are shown as yellow spheres.
