3SM4	Hydrolase Dna	date	Jun 27, 2011
title	Crystal Structure Of The K131a Mutant Of Lambda Exonuclease With A 5'-Phosphorylated 14-Mer12-Mer Duplex And Magnesium
authors	C.E.Bell, J.Zhang
compound		source
Molecule: Exonuclease Chain: A, B, C Ec: 3.1.11.3 Engineered: Yes Mutation: Yes		Organism_scientific: Enterobacteria Phage Lambda Organism_taxid: 10710 Gene: Exo, Lambda Exonuclease, Red-Alpha, Redx Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: Bl21-Ai Expression_system_vector_type: Pet-14b
Molecule: 5'-D(Tpcpgpgptpapcpapgptpapg)-3' Chain: D Engineered: Yes		Synthetic: Yes
Molecule: 5'-D(Papgpcptpapcptpgptpapcpcpgpa)- Chain: E Engineered: Yes Other_details: 5'-Phosphorylated		Synthetic: Yes
symmetry	Space Group: P 65	R_factor 0.160 R_Free 0.186
crystal cell	length a length b length c angle alpha angle beta angle gamma 78.391 78.391 247.534 90.00 90.00 120.00
method	X-Ray Diffraction	resolution	1.88 Å
ligand	CL, MG, PO4	enzyme	Hydrolase E.C.3.1.11.3 BRENDA
note	3SM4 is a representative structure
Gene Ontology	Chain Function Process Component A, C, B nuclease activity exonuclease activity
Primary reference	Crystal structures of {lambda} exonuclease in complex with DNA suggest an electrostatic ratchet mechanism for processivity., Zhang J, McCabe KA, Bell CE, Proc Natl Acad Sci U S A. 2011 Jul 5. PMID:21730170

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (258 Kb) [Save to disk] Biological Unit Coordinates (3sm4.pdb1.gz) 249 Kb LPC: Ligand-Protein Contacts for 3SM4 CSU: Contacts of Structural Units for 3SM4 Structure Factors (966 Kb) Retrieve 3SM4 in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 3SM4 from S2C, [Save to disk] Re-refined 3sm4 structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 3SM4 in 3D

Proteopedia, because life has more than 2D. On Jmol, a nice Rasmol like molecule viewer. This is good for easiest viewing of basic structure. On FirstGlance, an excellent tool for a guided tour on the structure components, by E. Martz.

Visual 3D analysis of 3SM4

Ramachandran plot from PDBSum

Structure-derived information

Dipole moment, from Dipole Server at Weizmann Institute 3D motif for 3SM4, from MSDmotif at EBI

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [3sm4_C] [3sm4_A] [3sm4_E] [3sm4_B] [3sm4_D] [3sm4] SWISS-PROT database: Domain organization of by SWISSPFAM

Other resources with information on 3SM4

Community annotation for 3SM4 at PDBWiki (http://pdbwiki.org)

Movements, Movies and Images

Images from IMB Jena Image Library of Biological Macromolecules.

You may enter another PDB ID code

Go [Back], to the [PDB Lite page], to the [OCA Search page] or to the [PDB Home page]

---

OCA© by Jaime Prilusky, 1996-2014,2022 Bioinformatics Unit Weizmann Institute of Science

---