2J28

MODEL OF E. COLI SRP BOUND TO 70S RNCS


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Following the Signal Sequence from Ribosomal Tunnel Exit to Signal Recognition Particle

Halic, M.Blau, M.Becker, T.Mielke, T.Pool, M.R.Wild, K.Sinning, I.Beckmann, R.

(2006) Nature 444: 508-511

  • DOI: 10.1038/nature05326
  • Primary Citation of Related Structures:  
    2J28, 2J37

  • PubMed Abstract: 
  • Membrane and secretory proteins can be co-translationally inserted into or translocated across the membrane. This process is dependent on signal sequence recognition on the ribosome by the signal recognition particle (SRP), which results in targeting of the ribosome-nascent-chain complex to the protein-conducting channel at the membrane ...

    Membrane and secretory proteins can be co-translationally inserted into or translocated across the membrane. This process is dependent on signal sequence recognition on the ribosome by the signal recognition particle (SRP), which results in targeting of the ribosome-nascent-chain complex to the protein-conducting channel at the membrane. Here we present an ensemble of structures at subnanometre resolution, revealing the signal sequence both at the ribosomal tunnel exit and in the bacterial and eukaryotic ribosome-SRP complexes. Molecular details of signal sequence interaction in both prokaryotic and eukaryotic complexes were obtained by fitting high-resolution molecular models. The signal sequence is presented at the ribosomal tunnel exit in an exposed position ready for accommodation in the hydrophobic groove of the rearranged SRP54 M domain. Upon ribosome binding, the SRP54 NG domain also undergoes a conformational rearrangement, priming it for the subsequent docking reaction with the NG domain of the SRP receptor. These findings provide the structural basis for improving our understanding of the early steps of co-translational protein sorting.


    Organizational Affiliation

    Gene Center, Department of Chemistry and Biochemistry, University of Munich, Feodor-Lynen-Strasse 25, 81377 Munich, Germany.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L32A [auth 0]56Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7N4 (Escherichia coli (strain K12))
Explore P0A7N4 
Go to UniProtKB:  P0A7N4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7N4
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L33B [auth 1]54Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7N9 (Escherichia coli (strain K12))
Explore P0A7N9 
Go to UniProtKB:  P0A7N9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7N9
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L34C [auth 2]46Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7P5 (Escherichia coli (strain K12))
Explore P0A7P5 
Go to UniProtKB:  P0A7P5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7P5
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L35D [auth 3]64Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7Q1 (Escherichia coli (strain K12))
Explore P0A7Q1 
Go to UniProtKB:  P0A7Q1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7Q1
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L36E [auth 4]38Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7Q6 (Escherichia coli (strain K12))
Explore P0A7Q6 
Go to UniProtKB:  P0A7Q6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7Q6
Protein Feature View
Expand
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
SIGNAL SEQUENCEF [auth 7]18Escherichia coliMutation(s): 0 
UniProt
Find proteins for O62798 (Tursiops truncatus)
Explore O62798 
Go to UniProtKB:  O62798
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO62798
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
SIGNAL RECOGNITION PARTICLE 54H [auth 9]430Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0AGD7 (Escherichia coli (strain K12))
Explore P0AGD7 
Go to UniProtKB:  P0AGD7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AGD7
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L2K [auth C]267Escherichia coliMutation(s): 0 
UniProt
Find proteins for P60422 (Escherichia coli (strain K12))
Explore P60422 
Go to UniProtKB:  P60422
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60422
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L3L [auth D]209Escherichia coliMutation(s): 0 
UniProt
Find proteins for P60438 (Escherichia coli (strain K12))
Explore P60438 
Go to UniProtKB:  P60438
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60438
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L4M [auth E]201Escherichia coliMutation(s): 0 
UniProt
Find proteins for P60723 (Escherichia coli (strain K12))
Explore P60723 
Go to UniProtKB:  P60723
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60723
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 14
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L5N [auth F]178Escherichia coliMutation(s): 0 
UniProt
Find proteins for P62399 (Escherichia coli (strain K12))
Explore P62399 
Go to UniProtKB:  P62399
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP62399
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L6O [auth G]176Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0AG55 (Escherichia coli (strain K12))
Explore P0AG55 
Go to UniProtKB:  P0AG55
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AG55
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L9P [auth H]149Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7R1 (Escherichia coli (strain K12))
Explore P0A7R1 
Go to UniProtKB:  P0A7R1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7R1
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 17
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L11Q [auth I]141Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7J7 (Escherichia coli (strain K12))
Explore P0A7J7 
Go to UniProtKB:  P0A7J7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7J7
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 18
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L13R [auth J]140Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0AA10 (Escherichia coli (strain K12))
Explore P0AA10 
Go to UniProtKB:  P0AA10
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AA10
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 19
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L14S [auth K]121Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0ADY3 (Escherichia coli (strain K12))
Explore P0ADY3 
Go to UniProtKB:  P0ADY3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ADY3
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 20
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L15T [auth L]144Escherichia coliMutation(s): 0 
UniProt
Find proteins for P02413 (Escherichia coli (strain K12))
Explore P02413 
Go to UniProtKB:  P02413
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02413
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 21
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L16U [auth M]136Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0ADY7 (Escherichia coli (strain K12))
Explore P0ADY7 
Go to UniProtKB:  P0ADY7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ADY7
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 22
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L17V [auth N]127Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0AG44 (Escherichia coli (strain K12))
Explore P0AG44 
Go to UniProtKB:  P0AG44
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AG44
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 23
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L18W [auth O]117Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0C018 (Escherichia coli (strain K12))
Explore P0C018 
Go to UniProtKB:  P0C018
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C018
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 24
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L19X [auth P]114Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7K6 (Escherichia coli (strain K12))
Explore P0A7K6 
Go to UniProtKB:  P0A7K6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7K6
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 25
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L20Y [auth Q]117Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7L3 (Escherichia coli (strain K12))
Explore P0A7L3 
Go to UniProtKB:  P0A7L3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7L3
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 26
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L21Z [auth R]103Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0AG48 (Escherichia coli (strain K12))
Explore P0AG48 
Go to UniProtKB:  P0AG48
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AG48
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 27
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L22AA [auth S]110Escherichia coliMutation(s): 0 
UniProt
Find proteins for P61175 (Escherichia coli (strain K12))
Explore P61175 
Go to UniProtKB:  P61175
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61175
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 28
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L23BA [auth T]99Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0ADZ0 (Escherichia coli (strain K12))
Explore P0ADZ0 
Go to UniProtKB:  P0ADZ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ADZ0
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 29
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L24CA [auth U]102Escherichia coliMutation(s): 0 
UniProt
Find proteins for P60624 (Escherichia coli (strain K12))
Explore P60624 
Go to UniProtKB:  P60624
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60624
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 30
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L25DA [auth V]94Escherichia coliMutation(s): 0 
UniProt
Find proteins for P68919 (Escherichia coli (strain K12))
Explore P68919 
Go to UniProtKB:  P68919
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP68919
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 31
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L27EA [auth W]84Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7L8 (Escherichia coli (strain K12))
Explore P0A7L8 
Go to UniProtKB:  P0A7L8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7L8
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 32
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L29FA [auth X]63Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7M6 (Escherichia coli (strain K12))
Explore P0A7M6 
Go to UniProtKB:  P0A7M6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7M6
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 33
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L30GA [auth Y]58Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0AG51 (Escherichia coli (strain K12))
Explore P0AG51 
Go to UniProtKB:  P0AG51
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AG51
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 34
MoleculeChainsSequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L31HA [auth Z]70Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A7M9 (Escherichia coli (strain K12))
Explore P0A7M9 
Go to UniProtKB:  P0A7M9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7M9
Protein Feature View
Expand
  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 7
MoleculeChainsLengthOrganismImage
4.5S SIGNAL RECOGNITION PARTICLE RNAG [auth 8]74Escherichia coli
Protein Feature View
Expand
  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 9
MoleculeChainsLengthOrganismImage
5S RIBOSOMAL RNAI [auth A]117Escherichia coli
Protein Feature View
Expand
  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 10
MoleculeChainsLengthOrganismImage
23S RIBOSOMAL RNAJ [auth B]2904Escherichia coli
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download Ideal Coordinates CCD File 
AB [auth B],
AC [auth B],
AD [auth B],
AE [auth B],
BB [auth B],
AB [auth B],
AC [auth B],
AD [auth B],
AE [auth B],
BB [auth B],
BC [auth B],
BD [auth B],
BE [auth B],
CB [auth B],
CC [auth B],
CD [auth B],
CE [auth B],
DB [auth B],
DC [auth B],
DD [auth B],
DE [auth B],
EB [auth B],
EC [auth B],
ED [auth B],
EE [auth B],
FB [auth B],
FC [auth B],
FD [auth B],
FE [auth B],
GB [auth B],
GC [auth B],
GD [auth B],
GE [auth B],
HB [auth B],
HC [auth B],
HD [auth B],
HE [auth B],
IA [auth B],
IB [auth B],
IC [auth B],
ID [auth B],
IE [auth B],
JA [auth B],
JB [auth B],
JC [auth B],
JD [auth B],
JE [auth B],
KA [auth B],
KB [auth B],
KC [auth B],
KD [auth B],
KE [auth B],
LA [auth B],
LB [auth B],
LC [auth B],
LD [auth B],
LE [auth B],
MA [auth B],
MB [auth B],
MC [auth B],
MD [auth B],
ME [auth B],
NA [auth B],
NB [auth B],
NC [auth B],
ND [auth B],
NE [auth B],
OA [auth B],
OB [auth B],
OC [auth B],
OD [auth B],
OE [auth N],
PA [auth B],
PB [auth B],
PC [auth B],
PD [auth B],
QA [auth B],
QB [auth B],
QC [auth B],
QD [auth B],
RA [auth B],
RB [auth B],
RC [auth B],
RD [auth B],
SA [auth B],
SB [auth B],
SC [auth B],
SD [auth B],
TA [auth B],
TB [auth B],
TC [auth B],
TD [auth B],
UA [auth B],
UB [auth B],
UC [auth B],
UD [auth B],
VA [auth B],
VB [auth B],
VC [auth B],
VD [auth B],
WA [auth B],
WB [auth B],
WC [auth B],
WD [auth B],
XA [auth B],
XB [auth B],
XC [auth B],
XD [auth B],
YA [auth B],
YB [auth B],
YC [auth B],
YD [auth B],
ZA [auth B],
ZB [auth B],
ZC [auth B],
ZD [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-11-08
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-04-19
    Changes: Other
  • Version 1.4: 2017-08-30
    Changes: Data collection, Source and taxonomy
  • Version 1.5: 2018-10-03
    Changes: Data collection, Derived calculations