2RTK	Biotin-Binding Protein	date	Sep 11, 1997
title	Streptavidin-Glycoluril Complex, Ph 2.58, Space Group I4122 From An Apostreptavidin Crystal
authors	B.A.Katz
compound		source
Molecule: Streptavidin Chain: A		Organism_scientific: Streptomyces Avidinii Organism_taxid: 1895
symmetry	Space Group: I 41 2 2	R_factor 0.196 R_Free 0.276
crystal cell	length a length b length c angle alpha angle beta angle gamma 58.200 58.200 176.660 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	1.82 Å
ligand	ACT, GLL, SO4	enzyme
related structures	by homologous chain: 1VWA, 1VWB
Gene Ontology	Chain Function Process Component A
Primary reference	Binding of biotin to streptavidin stabilizes intersubunit salt bridges between Asp61 and His87 at low pH., Katz BA, J Mol Biol 1997 Dec 19;274(5):776-800. PMID:9405158

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (53 Kb) [Save to disk] Biological Unit Coordinates (2rtk.pdb1.gz) 180 Kb LPC: Ligand-Protein Contacts for 2RTK CSU: Contacts of Structural Units for 2RTK Likely Quarternary Molecular Structure file(s) for 2RTK Structure Factors (153 Kb) Retrieve 2RTK in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 2RTK from S2C, [Save to disk] Re-refined 2rtk structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 2RTK 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 2RTK

Ramachandran plot from PDBSum

Structure-derived information

Electron Density related parameters from EDS Electron Density Server, at Upsala Dipole moment, from Dipole Server at Weizmann Institute 3D motif for 2RTK, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d2rtk__, region [Jmol] [rasmolscript] [script source] Class (fold), Architecture (subfold), Topology, Homologous superfamily from CATH Summaries and structural analyses of PDB data files from PDBSum Identification of Protein Pockets & Cavities at CASTp

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [2rtk_A] [2rtk] SWISS-PROT database: [P22629] Domain organization of [SAV_STRAV] by SWISSPFAM

Other resources with information on 2RTK

Community annotation for 2RTK at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

Movements, Movies and Images

Images from IMB Jena Image Library of Biological Macromolecules.

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