1Q4N	Hydrolase	date	Aug 04, 2003
title	Structural Studies Of Phe256trp Of Human Salivary Alpha-Amyl Implications For The Role Of A Conserved Water Molecule And Associated Chain In Enzyme Activity
authors	N.Ramasubbu
compound		source
Molecule: Alpha-Amylase, Salivary Chain: X Synonym: 1,4-Alpha-D-Glucan Glucanohydrolase Ec: 3.2.1.1 Engineered: Yes Mutation: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Gene: Amy1a Or Amy1 Expression_system: Spodoptera Frugiperda Expression_system_common: Fall Armyworm Expression_system_taxid: 7108 Expression_system_vector_type: Baculovirus Expression_system_plasmid: Pvl1392
symmetry	Space Group: P 21 21 21	R_factor 0.156 R_Free 0.206
crystal cell	length a length b length c angle alpha angle beta angle gamma 51.900 74.200 134.820 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	2.07 Å
ligand	CA, CL, PCA, TAM	enzyme	Hydrolase E.C.3.2.1.1 BRENDA
related structures	by homologous chain: 1NM9, 1XH1
Gene Ontology	Chain Function Process Component X
Primary reference	Structural studies of a Phe256Trp mutant of human salivary alpha-amylase: implications for the role of a conserved water molecule in enzyme activity., Ramasubbu N, Sundar K, Ragunath C, Rafi MM, Arch Biochem Biophys 2004 Jan 1;421(1):115-24. PMID:14678792

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (90 Kb) [Save to disk] Biological Unit Coordinates (1q4n.pdb1.gz) 85 Kb LPC: Ligand-Protein Contacts for 1Q4N CSU: Contacts of Structural Units for 1Q4N Likely Quarternary Molecular Structure file(s) for 1Q4N Structure Factors (461 Kb) Retrieve 1Q4N in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1Q4N from S2C, [Save to disk] Re-refined 1q4n structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1Q4N 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 1Q4N

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 1Q4N, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1q4nx2, region X:1-403 [Jmol] [rasmolscript] [script source]     - Domain d1q4nx1, region X:404-496 [Jmol] [rasmolscript] [script source]

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [1q4n] [1q4n_X] SWISS-PROT database: [P04745] Domain organization of [AMY1_HUMAN] by SWISSPFAM Domains found in 1Q4N: [Aamy] [Aamy_C ] by SMART

Other resources with information on 1Q4N

Community annotation for 1Q4N at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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