1PK1

Hetero SAM domain structure of Ph and Scm.

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C (A, C)	Polyhomeotic-proximal chromatin protein	polymer	89	10319.5	2	UniProt (P39769) Pfam (PF07647)	Drosophila melanogaster (fruit fly)
2	B, D (B, D)	Sex comb on midleg CG9495-PA	polymer	89	10410.0	2	UniProt (Q9VHA0) Pfam (PF00536)	Drosophila melanogaster (fruit fly)
3	E, F, G, H (A, B, C, D)	water	water		18.0	193	Chemie (HOH)

Sequence modifications

A, C: 6 - 81 (UniProt: P39769)

PDB	External Database	Details
Met 1	-	cloning artifact
Glu 2	-	cloning artifact
Lys 3	-	cloning artifact
Thr 4	-	cloning artifact
Arg 5	-	cloning artifact
Mse 61	Met 1557	modified residue
Mse 63	Met 1559	modified residue
Arg 69	Leu 1565	engineered mutation
Arg 82	-	expression tag
Asp 83	-	expression tag
His 84	-	expression tag
His 85	-	expression tag
His 86	-	expression tag
His 87	-	expression tag
His 88	-	expression tag
His 89	-	expression tag

B, D: 6 - 82 (UniProt: Q9VHA0)

PDB	External Database	Details
Met 1	-	cloning artifact
Glu 2	-	cloning artifact
Lys 3	-	cloning artifact
Thr 4	-	cloning artifact
Arg 5	-	cloning artifact
Arg 52	Leu 841	engineered mutation
Arg 57	Met 846	engineered mutation
Asp 83	-	expression tag
His 84	-	expression tag
His 85	-	expression tag
His 86	-	expression tag
His 87	-	expression tag
His 88	-	expression tag
His 89	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	41458.8
All*	Total formula weight	41458.8

*Water molecules are not included.