3M4B

A Zn-mediated tetrahedral protein lattice cage

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B, C, D	Soluble cytochrome b562	polymer	106	11645.1	4	UniProt (P0ABE7) Pfam (PF07361) In PDB	Escherichia coli	Cytochrome b-562
2	A, B, C, D	PROTOPORPHYRIN IX CONTAINING FE	non-polymer		616.5	4	Chemie (HEM)
3	A, B, C, D	ACETATE ION	non-polymer		59.0	4	Chemie (ACT)
4	A, B, D	ZINC ION	non-polymer		65.4	12	Chemie (ZN)
5		water	water		18.0	81	Chemie (HOH)

Sequence modifications

A, B, C, D: 1 - 106 (UniProt: P0ABE7)

PDB	External Database	Details
Ala 34	Arg 56	engineered mutation
Ala 38	Leu 60	engineered mutation
Trp 41	Gln 63	engineered mutation
Ser 42	Lys 64	engineered mutation
His 59	Lys 81	engineered mutation
Trp 66	Asp 88	engineered mutation
Cys 67	Ile 89	engineered mutation
Ile 69	Val 91	engineered mutation
His 73	Asp 95	engineered mutation
Ala 74	Asp 96	engineered mutation
His 77	Lys 99	engineered mutation
Cys 98	Arg 120	engineered mutation
Cys 101	Tyr 123	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	46580.2
Non-Polymers*	Number of molecules	20
	Total formula weight	3487.0
All*	Total formula weight	50067.3

*Water molecules are not included.