4AYA

Crystal structure of ID2 HLH homodimer at 2.1A resolution

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	DNA-BINDING PROTEIN INHIBITOR ID-2	polymer	97	10844.6	2	UniProt (Q02363) Pfam (PF00010)	HOMO SAPIENS (HUMAN)	CLASS D BASIC HELIX-LOOP-HELIX PROTEIN 26, CLASS B BASIC HELIX-LOOP-HELIX PROTEIN 26, BHLHB26, INHIBITOR OF DNA BINDING 2
2	C, E (A, B)	POTASSIUM ION	non-polymer		39.1	2	Chemie (K)
3	D (A)	ACETATE ION	non-polymer		59.0	1	Chemie (ACT)
4	F, G (A, B)	water	water		18.0	24	Chemie (HOH)

Sequence modifications

A, B: 1 - 82 (UniProt: Q02363)

PDB	External Database	Details
Gly 0	-	cloning artifact
Leu 83	-	SEE REMARK 999
Lys 84	-	SEE REMARK 999
Pro 85	-	SEE REMARK 999
Ser 86	-	SEE REMARK 999
Phe 87	-	SEE REMARK 999
Leu 88	-	SEE REMARK 999
Val 89	-	SEE REMARK 999
Gln 90	-	SEE REMARK 999
Ser 91	-	SEE REMARK 999
Gly 92	-	SEE REMARK 999
Asp 93	-	SEE REMARK 999
Ile 94	-	SEE REMARK 999
Ala 95	-	SEE REMARK 999
Ser 96	-	SEE REMARK 999

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	21689.1
Non-Polymers*	Number of molecules	3
	Total formula weight	137.2
All*	Total formula weight	21826.4

*Water molecules are not included.