2AAE

THE ROLE OF HISTIDINE-40 IN RIBONUCLEASE T1 CATALYSIS: THREE-DIMENSIONAL STRUCTURES OF THE PARTIALLY ACTIVE HIS40LYS MUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Role of histidine-40 in ribonuclease T1 catalysis: three-dimensionalstructures of the partially active His40Lys mutant.

Zegers, I.Verhelst, P.Choe, H.W.Steyaert, J.Heinemann, U.Saenger, W.Wyns, L.

(1992) Biochemistry 31: 11317-11325

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Histidine-40 is known to participate in phosphodiester transesterification catalyzed by the enzyme ribonuclease T1. A mutant enzyme with a lysine replacing the histidine-40 (His40Lys RNase T1) retains considerable catalytic activity [Steyaert, J., Ha ...

    Histidine-40 is known to participate in phosphodiester transesterification catalyzed by the enzyme ribonuclease T1. A mutant enzyme with a lysine replacing the histidine-40 (His40Lys RNase T1) retains considerable catalytic activity [Steyaert, J., Hallenga, K., Wyns, L., & Stanssens, P. (1990) Biochemistry 29, 9064-9072]. We report on the crystal structures of His40Lys RNase T1 containing a phosphate anion and a guanosine 2'-phosphate inhibitor in the active site, respectively. Similar to previously described structures, the phosphate-containing crystals are of space group P2(1)2(1)2(1), with one molecule per asymmetric unit (a = 48.27 A, b = 46.50 A, c = 41.14 A). The complex with 2'-GMP crystallized in the lower symmetry space group P2(1), with two molecules per asymmetric unit (a = 49.20 A, b = 48.19 A, c = 40.16 A, beta = 90.26). The crystal structures have been solved at 1.8- and 2.0-A resolution yielding R values of 14.5% and 16.0%, respectively. Comparison of these His40Lys structures with the corresponding wild-type structures, containing 2'-GMP [Arni, R., Heinemann, U., Tokuoka, R., & Saenger, W. (1988) J. Biol. Chem. 263, 15358-15368] and vanadate [Kostrewa, D., Hui-Woog Choe, Heinemann, U., & Saenger, W. (1989) Biochemistry 28, 7692-7600] in the active site, respectively, leads to the following conclusions. First, the His40Lys mutation causes no significant changes in the overall structure of RNase T1; second, the Lys40 side chains in the mutant structures occupy roughly the same space as His40 in the corresponding wild-type RNase T1 structures.(ABSTRACT TRUNCATED AT 250 WORDS)


    Organizational Affiliation

    Instituut voor Moleculaire Biologie, Vrije Universiteit Brussel, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RIBONUCLEASE T1
A
104Aspergillus oryzae (strain ATCC 42149 / RIB 40)Mutation(s): 0 
Gene Names: rntA
EC: 3.1.27.3
Find proteins for P00651 (Aspergillus oryzae (strain ATCC 42149 / RIB 40))
Go to UniProtKB:  P00651
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

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Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 48.270α = 90.00
b = 46.500β = 90.00
c = 41.120γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other