1YAC

THE 1.8 ANGSTROM CRYSTAL STRUCTURE OF THE YCAC GENE PRODUCT FROM ESCHERICHIA COLI REVEALS AN OCTAMERIC HYDROLASE OF UNKNOWN SPECIFICITY

• PDB DOI: https://doi.org/10.2210/pdb1YAC/pdb

• Classification: UNKNOWN BACTERIAL HYDROLASE
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 1998-07-29 Released: 1999-02-16 
• Deposition Author(s): Colovos, C., Cascio, D., Yeates, T.O.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.196 
• R-Value Work: 0.175 
• R-Value Observed: 0.175 

Literature

The 1.8 A crystal structure of the ycaC gene product from Escherichia coli reveals an octameric hydrolase of unknown specificity.

Colovos, C., Cascio, D., Yeates, T.O.

(1998) Structure 6: 1329-1337

• PubMed: 9782055 
• DOI: https://doi.org/10.1016/s0969-2126(98)00132-4
• Primary Citation of Related Structures:  
  1YAC


• PubMed Abstract: 
  

  The ycaC gene comprises a 621 base pair open reading frame in Escherichia coli. The ycaC gene product (ycaCgp) is uncharacterized and has no assigned function. The closest sequence homologs with an assigned function belong to a family of bacterial hydrolases that catalyze isochorismatase-like reactions, but these have only low sequence similarity to ycaCgp (approximately 20% amino acid identity). The ycaCgp was obtained and identified during crystallization trials of an unrelated E. coli protein with which it co-purified.

---

Organizational Affiliation: 

Department of Chemistry & Biochemistry Molecular Biology Institute UCLA-DOE Laboratory of Structural Biology and Molecular Medicine University of California Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095, USA.

Biological Assembly 1  

Global Symmetry: Dihedral - D4  (Explore in 3D)
Global Stoichiometry: Homo 8-mer - A8 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 45.96 kDa 
• Atom Count: 3,435 
• Modelled Residue Count: 408 
• Deposited Residue Count: 416 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
YCAC GENE PRODUCT	A, B	208	Escherichia coli	Mutation(s): 0  Gene Names: YCAC
UniProt
Find proteins for P21367 (Escherichia coli (strain K12)) Explore P21367  Go to UniProtKB:  P21367

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.196 
• R-Value Work: 0.175 
• R-Value Observed: 0.175 
• Space Group: P 4 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 91.898	α = 90
b = 91.898	β = 90
c = 113.4	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-02-16 
Deposition Author(s): Colovos, C., Cascio, D., Yeates, T.O.

Revision History  

• Version 1.0: 1999-02-16
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2024-02-14
  Changes: Data collection, Database references, Derived calculations, Other