Identify the First Step in the Mechanism for the Vitamin

question 74

Multiple Choice

Identify the first step in the mechanism for the vitamin KH₂-dependent carboxylation of glutamate.

• A)The vitamin K base removes a proton from the gamma-carbon of the gluatamate.
• B)The vitamin loses a proton from a phenolic OH group.
• C)The dioxetane collapses to form a vitamin K base.
• D)The base attacks molecular oxygen.
• E)The glutamate carbanion attacks carbon dioxide.