3CRP

A heterospecific leucine zipper tetramer

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, D	GCN4 leucine zipper	polymer	34	3902.6	2	UniProt (P03069) Pfam (PF07716) In PDB	Saccharomyces cerevisiae (Baker's yeast)	Amino acid biosynthesis regulatory protein
2	B, C, E	GCN4 leucine zipper	polymer	34	3902.5	3	UniProt (P03069) Pfam (PF07716) In PDB	Saccharomyces cerevisiae (Baker's yeast)	Amino acid biosynthesis regulatory protein
3	B	SODIUM ION	non-polymer		23.0	1	Chemie (NA)
4		water	water		18.0	130	Chemie (HOH)

Sequence modifications

A, D: 4 - 34 (UniProt: P03069)

PDB	External Database	Details
Met 1	-	expression tag
Lys 2	-	expression tag
Val 3	-	expression tag
Ala 7	Glu 254	engineered mutation
Ala 21	Glu 268	engineered mutation
Ala 28	Lys 275	engineered mutation

B, C, E: 4 - 34 (UniProt: P03069)

PDB	External Database	Details
Met 1	-	expression tag
Lys 2	-	expression tag
Val 3	-	expression tag
Ala 9	Lys 256	engineered mutation
Ala 16	Lys 263	engineered mutation
Ala 23	Glu 270	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	5
	Total formula weight	19512.8
Non-Polymers*	Number of molecules	1
	Total formula weight	23.0
All*	Total formula weight	19535.8

*Water molecules are not included.