3KHK

Crystal structure of type-I restriction-modification system methylation subunit (MM_0429) from Methanosarchina mazei.

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)	Type I restriction-modification system methylation subunit	polymer	544	62865.3	2	UniProt (Q8PZR3) Pfam (PF12161) Pfam (PF02384)	Methanosarcina mazei (Methanosarcina frisia)
2	C, D (A, B)	SULFATE ION	non-polymer		96.1	2	Chemie (SO4)
3	E, F (A, B)	water	water		18.0	18	Chemie (HOH)

Sequence modifications

A, B: 3 - 535 (UniProt: Q8PZR3)

PDB	External Database	Details
Met 0	-	expression tag
Ser 1	-	expression tag
Leu 2	-	expression tag
Glu 536	-	expression tag
Gly 537	-	expression tag
His 538	-	expression tag
His 539	-	expression tag
His 540	-	expression tag
His 541	-	expression tag
His 542	-	expression tag
His 543	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	125730.7
Non-Polymers*	Number of molecules	2
	Total formula weight	192.1
All*	Total formula weight	125922.8

*Water molecules are not included.