Table 1. N-terminal sequences of GCS and control proteins. The ATCUN motif is shown in bold italic.

Construct					+1	H148	–1
cpOPT		NH2–	E	L	S	H	N	V	Y	I	T
GCS-1			NH2–	G	G	H	N	V	Y	I	T
(–1)GCS-1				NH2–	G	G	H	V	Y	I	T
GCS-2		NH2–	G	G	H	H	N	V	Y	I	T
G-GCS-2	NH2–	G	G	G	H	H	N	V	Y	I	T
GCS-2-G		NH2–	G	G	H	G	N	V	Y	I	T