3CK4

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, E, H, I...	GCN4 leucine zipper	polymer	34	3986.8	6	UniProt (P03069) Pfam (PF07716) In PDB	Saccharomyces cerevisiae (Baker's yeast)
2	B, C, F, G, J...	GCN4 leucine zipper	polymer	34	3986.7	6	UniProt (P03069) Pfam (PF07716) In PDB	Saccharomyces cerevisiae (Baker's yeast)
3	B, F, I, J	MAGNESIUM ION	non-polymer		24.3	4	Chemie (MG)
4		water	water		18.0	405	Chemie (HOH)

Sequence modifications

A, D, E, H, I, L: 4 - 34 (UniProt: P03069)

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

B, C, F, G, J, K: 4 - 34 (UniProt: P03069)

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

Contents of the asymmetric unit

Polymers	Number of chains	12
	Total formula weight	47840.8
Non-Polymers*	Number of molecules	4
	Total formula weight	97.2
All*	Total formula weight	47938.0

*Water molecules are not included.