1R22

Crystal structure of the cyanobacterial metallothionein repressor SmtB (C14S/C61S/C121S mutant) in the Zn2alpha5-form

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)	Transcriptional repressor smtB	polymer	122	13513.3	2	UniProt (P30340) Pfam (PF01022)	Synechococcus elongatus PCC 7942
2	C, D (A, B)	ZINC ION	non-polymer		65.4	2	Chemie (ZN)
3	E, F (A, B)	water	water		18.0	60	Chemie (HOH)

Sequence modifications

A, B: 1 - 122 (UniProt: P30340)

PDB	External Database	Details
Ser 14	Cys 14	engineered mutation
Ser 61	Cys 61	engineered mutation
Ser 121	Cys 121	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	27026.6
Non-Polymers*	Number of molecules	2
	Total formula weight	130.8
All*	Total formula weight	27157.4

*Water molecules are not included.