7PI5 | pdb_00007pi5

Unstacked stretched Dunaliella PSII

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.78 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history. 

Literature

Structure of Dunaliella Photosystem II reveals conformational flexibility of stacked and unstacked supercomplexes.

Caspy, I., Fadeeva, M., Mazor, Y., Nelson, N.

(2023) Elife 12

  • DOI: https://doi.org/10.7554/eLife.81150
  • Primary Citation Related Structures: 
    7PI0, 7PI5, 7PIN, 7PIW, 7PNK

  • PubMed Abstract: 

    Photosystem II (PSII) generates an oxidant whose redox potential is high enough to enable water oxidation , a substrate so abundant that it assures a practically unlimited electron source for life on earth . Our knowledge on the mechanism of water photooxidation was greatly advanced by high-resolution structures of prokaryotic PSII . Here, we show high-resolution cryogenic electron microscopy (cryo-EM) structures of eukaryotic PSII from the green alga Dunaliella salina at two distinct conformations. The conformers are also present in stacked PSII, exhibiting flexibility that may be relevant to the grana formation in chloroplasts of the green lineage. CP29, one of PSII associated light-harvesting antennae, plays a major role in distinguishing the two conformations of the supercomplex. We also show that the stacked PSII dimer, a form suggested to support the organisation of thylakoid membranes , can appear in many different orientations providing a flexible stacking mechanism for the arrangement of grana stacks in thylakoids. Our findings provide a structural basis for the heterogenous nature of the eukaryotic PSII on multiple levels.

    • Organizational Affiliation: 
    • Department of Biochemistry and Molecular Biology, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel.

Macromolecule Content 

  • Total Structure Weight: 1,081.35 kDa 
  • Atom Count: 76,287 
  • Modeled Residue Count: 7,455 
  • Deposited Residue Count: 7,456 
  • Unique protein chains: 25

Macromolecules

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Entity ID: 1
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II protein D1A,
Z [auth a]		336Dunaliella salinaMutation(s): 0 
EC: 1.10.3.9
Membrane Entity: Yes 
UniProt
Find proteins for D0FY08 (Dunaliella salina)
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Reference Sequence
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Entity ID: 2
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II CP47 reaction center proteinAA [auth b],
B		484Dunaliella salinaMutation(s): 2 
Membrane Entity: Yes 
UniProt
Find proteins for D0FY05 (Dunaliella salina)
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Reference Sequence
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Entity ID: 3
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein Ycf12BA [auth v],
C [auth V]		32Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D0FY13 (Dunaliella salina)
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Reference Sequence
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Entity ID: 4
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II CP43 reaction center proteinCA [auth c],
D [auth C]		449Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D0FXY3 (Dunaliella salina)
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Reference Sequence
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Entity ID: 5
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II D2 proteinDA [auth d],
E [auth D]		348Dunaliella salinaMutation(s): 0 
EC: 1.10.3.9
Membrane Entity: Yes 
UniProt
Find proteins for A0A1C8XRK9 (Dunaliella salina)
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Reference Sequence
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Entity ID: 6
MoleculeChains  Sequence LengthOrganismDetailsImage
Cytochrome b559 subunit alphaEA [auth e],
F [auth E]		76Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D0FY01 (Dunaliella salina)
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Reference Sequence
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Entity ID: 7
MoleculeChains  Sequence LengthOrganismDetailsImage
Cytochrome b559 subunit betaFA [auth f],
G [auth F]		31Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A1C8XRP4 (Dunaliella salina)
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Reference Sequence
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Entity ID: 8
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein HGA [auth h],
H		67Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A1C8XRP3 (Dunaliella salina)
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Reference Sequence
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Entity ID: 9
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein IHA [auth i],
I		35Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D0FXX5 (Dunaliella salina)
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Reference Sequence
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Entity ID: 10
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein JIA [auth j],
J		36Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A1C8XRM8 (Dunaliella salina)
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Reference Sequence
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Entity ID: 11
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein KJA [auth k],
K		37Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D0FXX2 (Dunaliella salina)
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Reference Sequence
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Entity ID: 12
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein LKA [auth l],
L		38Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D0FY19 (Dunaliella salina)
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Reference Sequence
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Entity ID: 13
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein MLA [auth m],
M		32Dunaliella salinaMutation(s): 1 
Membrane Entity: Yes 
UniProt
Find proteins for D0FXZ3 (Dunaliella salina)
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Reference Sequence
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Entity ID: 14
MoleculeChains  Sequence LengthOrganismDetailsImage
PsbOMA [auth o],
N [auth O]		238Dunaliella salinaMutation(s): 0 
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Entity ID: 15
MoleculeChains  Sequence LengthOrganismDetailsImage
PsbPNA [auth p],
O [auth P]		187Dunaliella salinaMutation(s): 0 
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Entity ID: 16
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein TOA [auth t],
P [auth T]		30Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D0FY04 (Dunaliella salina)
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Reference Sequence
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Entity ID: 17
MoleculeChains  Sequence LengthOrganismDetailsImage
PSII 6.1 kDa proteinPA [auth w],
Q [auth W]		44Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A7S3QU88 (Dunaliella tertiolecta)
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Entity ID: 18
MoleculeChains  Sequence LengthOrganismDetailsImage
Hypothetical proteinQA [auth x],
R [auth X]		30Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for A0A7S3VKF3 (Dunaliella tertiolecta)
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Reference Sequence
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Entity ID: 19
MoleculeChains  Sequence LengthOrganismDetailsImage
Photosystem II reaction center protein ZRA [auth z],
S [auth Z]		61Dunaliella salinaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D0FXZ2 (Dunaliella salina)
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Entity ID: 20
MoleculeChains  Sequence LengthOrganismDetailsImage
LHCII M3SA [auth n],
T [auth N]		222Dunaliella salinaMutation(s): 0 
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Entity ID: 21
MoleculeChains  Sequence LengthOrganismDetailsImage
Chlorophyll a-b binding protein, chloroplasticTA [auth g],
U [auth G]		221Dunaliella salinaMutation(s): 0 
UniProt
Find proteins for A1XKU7 (Dunaliella salina)
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Reference Sequence
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Entity ID: 22
MoleculeChains  Sequence LengthOrganismDetailsImage
CP29UA [auth r],
V [auth R]		202Dunaliella salinaMutation(s): 0 
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Entity ID: 23
MoleculeChains  Sequence LengthOrganismDetailsImage
CP26VA [auth s],
W [auth S]		243Dunaliella salinaMutation(s): 0 
UniProt
Find proteins for A0A7S3VRZ8 (Dunaliella tertiolecta)
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Reference Sequence
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Entity ID: 24
MoleculeChains  Sequence LengthOrganismDetailsImage
LHCII M1WA [auth y],
X [auth Y]		222Dunaliella salinaMutation(s): 0 
UniProt
Find proteins for A0A6S8N9J6 (Dunaliella tertiolecta)
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Reference Sequence
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Entity ID: 25
MoleculeChains  Sequence LengthOrganismDetailsImage
PsbUXA [auth u],
Y [auth U]		27Dunaliella salinaMutation(s): 0 

Small Molecules

Ligands 26 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DGD

Query on DGD


Download:Ideal Coordinates CCD File
AD [auth C]
BD [auth C]
CD [auth C]
ED [auth C]
PJ [auth c]
AD [auth C],
BD [auth C],
CD [auth C],
ED [auth C],
PJ [auth c],
QJ [auth c],
RJ [auth c],
TJ [auth c]
DIGALACTOSYL DIACYL GLYCEROL (DGDG)
C51 H96 O15
LDQFLSUQYHBXSX-HXXRYREZSA-N
CHL

Query on CHL


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AH [auth Y]
BE [auth N]
CE [auth N]
CG [auth S]
DE [auth N]
AH [auth Y],
BE [auth N],
CE [auth N],
CG [auth S],
DE [auth N],
DG [auth S],
EE [auth N],
EG [auth S],
FE [auth N],
FM [auth r],
GL [auth g],
GM [auth r],
IN [auth y],
KL [auth g],
LL [auth g],
MF [auth R],
ML [auth g],
MN [auth y],
NF [auth R],
NK [auth n],
NL [auth g],
NM [auth s],
NN [auth y],
OL [auth g],
ON [auth y],
QE [auth G],
QN [auth y],
RK [auth n],
SG [auth Y],
SK [auth n],
SM [auth s],
TK [auth n],
TM [auth s],
UE [auth G],
UK [auth n],
UM [auth s],
VE [auth G],
VK [auth n],
WE [auth G],
WG [auth Y],
XD [auth N],
XE [auth G],
XF [auth S],
XG [auth Y],
YE [auth G],
YG [auth Y]
CHLOROPHYLL B
C55 H70 Mg N4 O6
MWVCRINOIIOUAU-UYSPMESUSA-M
CLA

Query on CLA


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AC [auth B]
AE [auth N]
AF [auth G]
AG [auth S]
AI [auth b]
AC [auth B],
AE [auth N],
AF [auth G],
AG [auth S],
AI [auth b],
AJ [auth c],
AK [auth d],
AL [auth n],
AN [auth s],
BC [auth B],
BF [auth G],
BG [auth S],
BH [auth Y],
BI [auth b],
BJ [auth c],
BN [auth s],
CB [auth A],
CF [auth G],
CH [auth Y],
CI [auth b],
CJ [auth c],
CM [auth r],
DB [auth A],
DF [auth G],
DH [auth Y],
DI [auth b],
DJ [auth c],
DM [auth r],
EB [auth A],
EH [auth Y],
EI [auth b],
EJ [auth c],
EM [auth r],
FG [auth S],
FH [auth Y],
FI [auth b],
FJ [auth c],
GE [auth N],
GG [auth S],
GI [auth b],
GJ [auth c],
HB [auth A],
HE [auth N],
HG [auth S],
HI [auth b],
HJ [auth c],
HL [auth g],
HM [auth r],
IE [auth N],
IG [auth S],
II [auth b],
IJ [auth c],
IL [auth g],
IM [auth r],
JC [auth C],
JE [auth N],
JF [auth R],
JG [auth S],
JI [auth b],
JJ [auth c],
JL [auth g],
JM [auth r],
JN [auth y],
KC [auth C],
KD [auth D],
KE [auth N],
KF [auth R],
KG [auth S],
KI [auth b],
KJ [auth c],
KM [auth r],
KN [auth y],
LC [auth C],
LD [auth D],
LF [auth R],
LG [auth S],
LI [auth b],
LM [auth r],
LN [auth y],
MB [auth B],
MC [auth C],
MI [auth b],
MM [auth r],
NB [auth B],
NC [auth C],
NI [auth b],
OB [auth B],
OC [auth C],
OF [auth R],
OI [auth b],
OK [auth n],
OM [auth s],
PB [auth B],
PC [auth C],
PF [auth R],
PI [auth b],
PK [auth n],
PL [auth g],
PM [auth s],
PN [auth y],
QB [auth B],
QC [auth C],
QF [auth R],
QH [auth a],
QK [auth n],
QL [auth g],
QM [auth s],
RB [auth B],
RC [auth C],
RE [auth G],
RF [auth R],
RH [auth a],
RL [auth g],
RM [auth s],
RN [auth y],
SB [auth B],
SC [auth C],
SE [auth G],
SF [auth R],
SH [auth a],
SL [auth g],
SN [auth y],
TB [auth B],
TC [auth C],
TE [auth G],
TF [auth R],
TG [auth Y],
TL [auth g],
TN [auth y],
UB [auth B],
UC [auth C],
UG [auth Y],
UN [auth y],
VB [auth B],
VC [auth C],
VG [auth Y],
VH [auth a],
VM [auth s],
VN [auth y],
WB [auth B],
WK [auth n],
WM [auth s],
XB [auth B],
XK [auth n],
XM [auth s],
YB [auth B],
YD [auth N],
YF [auth S],
YI [auth c],
YK [auth n],
YM [auth s],
ZB [auth B],
ZD [auth N],
ZE [auth G],
ZF [auth S],
ZG [auth Y],
ZI [auth c],
ZJ [auth d],
ZK [auth n],
ZM [auth s]
CHLOROPHYLL A
C55 H72 Mg N4 O5
ATNHDLDRLWWWCB-AENOIHSZSA-M
PHO

Query on PHO


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FB [auth A],
GB [auth A],
TH [auth a],
UH [auth a]		PHEOPHYTIN A
C55 H74 N4 O5
CQIKWXUXPNUNDV-RCBXBCQGSA-N
SQD

Query on SQD


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FC [auth B]
HD [auth C]
JB [auth A]
TI [auth b]
WJ [auth c]
FC [auth B],
HD [auth C],
JB [auth A],
TI [auth b],
WJ [auth c],
XH [auth a]
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL
C41 H78 O12 S
RVUUQPKXGDTQPG-JUDHQOGESA-N
LMG

Query on LMG


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DD [auth C]
GC [auth B]
GK [auth d]
JK [auth h]
KB [auth A]
DD [auth C],
GC [auth B],
GK [auth d],
JK [auth h],
KB [auth A],
LK [auth j],
RD [auth D],
SJ [auth c],
UD [auth H],
UI [auth b],
VD [auth J],
YH [auth a]
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
C45 H86 O10
DCLTVZLYPPIIID-CVELTQQQSA-N
LMK

Query on LMK


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ID [auth C],
XJ [auth c]		trimethyl-[(2~{R})-1-oxidanyl-1-oxidanylidene-4-[(2~{S})-2-[(1~{S})-1-oxidanyloctadecoxy]-3-[(1~{R})-1-oxidanyloctadecoxy]propoxy]butan-2-yl]azanium
C46 H94 N O7
BUXLRCGOLVGJEI-LHQLQFMZSA-O
PL9

Query on PL9


Download:Ideal Coordinates CCD File
CK [auth d],
ND [auth D]		2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE
C53 H80 O2
FKUYMLZIRPABFK-UHFFFAOYSA-N
LHG

Query on LHG


Download:Ideal Coordinates CCD File
AO [auth y]
DK [auth d]
EK [auth d]
FK [auth d]
FL [auth n]
AO [auth y],
DK [auth d],
EK [auth d],
FK [auth d],
FL [auth n],
FN [auth s],
GD [auth C],
IF [auth G],
KH [auth Y],
MK [auth l],
OD [auth D],
PD [auth D],
PE [auth N],
PG [auth S],
QD [auth D],
VJ [auth c],
WD [auth L],
YL [auth g]
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
C38 H75 O10 P
BIABMEZBCHDPBV-MPQUPPDSSA-N
3PH

Query on 3PH


Download:Ideal Coordinates CCD File
HN [auth s],
KK [auth i],
RG [auth S]		1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE
C39 H77 O8 P
YFWHNAWEOZTIPI-DIPNUNPCSA-N
DGA

Query on DGA


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FD [auth C],
HC [auth B],
UJ [auth c],
VI [auth b]		DIACYL GLYCEROL
C39 H76 O5
UHUSDOQQWJGJQS-QNGWXLTQSA-N
HEM

Query on HEM


Download:Ideal Coordinates CCD File
HK [auth f],
SD [auth F]		PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
NEX

Query on NEX


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BM [auth r]
EL [auth n]
EN [auth s]
HF [auth G]
JH [auth Y]
BM [auth r],
EL [auth n],
EN [auth s],
HF [auth G],
JH [auth Y],
OE [auth N],
OG [auth S],
WF [auth R],
XL [auth g],
ZN [auth y]
(1R,3R)-6-{(3E,5E,7E,9E,11E,13E,15E,17E)-18-[(1S,4R,6R)-4-HYDROXY-2,2,6-TRIMETHYL-7-OXABICYCLO[4.1.0]HEPT-1-YL]-3,7,12,16-TETRAMETHYLOCTADECA-1,3,5,7,9,11,13,15,17-NONAENYLIDENE}-1,5,5-TRIMETHYLCYCLOHEXANE-1,3-DIOL
C40 H56 O4
PGYAYSRVSAJXTE-OQASCVKESA-N
XAT

Query on XAT


Download:Ideal Coordinates CCD File
AM [auth r]
DL [auth n]
GF [auth G]
IH [auth Y]
NE [auth N]
AM [auth r],
DL [auth n],
GF [auth G],
IH [auth Y],
NE [auth N],
VF [auth R],
WL [auth g],
YN [auth y]
(3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL
C40 H56 O4
SZCBXWMUOPQSOX-WVJDLNGLSA-N
LUT

Query on LUT


Download:Ideal Coordinates CCD File
BL [auth n]
CL [auth n]
CN [auth s]
DN [auth s]
EF [auth G]
BL [auth n],
CL [auth n],
CN [auth s],
DN [auth s],
EF [auth G],
FF [auth G],
GH [auth Y],
HH [auth Y],
LE [auth N],
ME [auth N],
MG [auth S],
NG [auth S],
UF [auth R],
UL [auth g],
VL [auth g],
WN [auth y],
XN [auth y],
ZL [auth r]
(3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL
C40 H56 O2
KBPHJBAIARWVSC-NSIPBSJQSA-N
C7Z

Query on C7Z


Download:Ideal Coordinates CCD File
EC [auth B],
SI [auth b]		(1~{S})-3,5,5-trimethyl-4-[(1~{E},3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E},17~{E})-3,7,12,16-tetramethyl-18-[(4~{S})-2,6,6-trimethyl-4-oxidanyl-cyclohexen-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohex-3-en-1-ol
C40 H56 O2
JKQXZKUSFCKOGQ-ANDPMPNWSA-N
RRX

Query on RRX


Download:Ideal Coordinates CCD File
IK [auth h],
TD [auth H]		(3R)-beta,beta-caroten-3-ol
C40 H56 O
DMASLKHVQRHNES-FKKUPVFPSA-N
BCR

Query on BCR


Download:Ideal Coordinates CCD File
BK [auth d]
CC [auth B]
DC [auth B]
IB [auth A]
LJ [auth c]
BK [auth d],
CC [auth B],
DC [auth B],
IB [auth A],
LJ [auth c],
MD [auth D],
MJ [auth c],
NJ [auth c],
OJ [auth c],
QI [auth b],
RI [auth b],
WC [auth C],
WH [auth a],
XC [auth C],
YC [auth C],
ZC [auth C]
BETA-CAROTENE
C40 H56
OENHQHLEOONYIE-JLTXGRSLSA-N
LPX

Query on LPX


Download:Ideal Coordinates CCD File
GN [auth s],
QG [auth S]		(2S)-3-{[(R)-(2-aminoethoxy)(hydroxy)phosphoryl]oxy}-2-hydroxypropyl hexadecanoate
C21 H44 N O7 P
YVYMBNSKXOXSKW-FQEVSTJZSA-N
OEX

Query on OEX


Download:Ideal Coordinates CCD File
MH [auth a],
YA [auth A]		CA-MN4-O5 CLUSTER
Ca Mn4 O5
SEXWDHMBWJEXOJ-UHFFFAOYSA-N
SPH

Query on SPH


Download:Ideal Coordinates CCD File
BO [auth y],
LH [auth Y]		SPHINGOSINE
C18 H37 N O2
WWUZIQQURGPMPG-MSOLQXFVSA-N
GOL

Query on GOL


Download:Ideal Coordinates CCD File
CO [auth y],
IC [auth B],
WI [auth b],
XI [auth b]		GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
BCT

Query on BCT


Download:Ideal Coordinates CCD File
JD [auth D],
YJ [auth d]		BICARBONATE ION
C H O3
BVKZGUZCCUSVTD-UHFFFAOYSA-M
FE2

Query on FE2


Download:Ideal Coordinates CCD File
NH [auth a],
ZA [auth A]		FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
CL

Query on CL


Download:Ideal Coordinates CCD File
AB [auth A],
BB [auth A],
OH [auth a],
PH [auth a]		CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA

Query on NA


Download:Ideal Coordinates CCD File
LB [auth A],
ZH [auth a]		SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.78 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
RECONSTRUCTIONRELION3.1

Structure Validation

View Full Validation Report



View more in-depth experimental data

Entry History 

& Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Israel Science FoundationIsrael569/17
Israel Science FoundationIsrael199/21

Revision History  (Full details and data files)

  • Version 1.0: 2022-08-17
    Type: Initial release
  • Version 1.1: 2023-03-01
    Changes: Database references, Refinement description
  • Version 1.2: 2024-07-17
    Changes: Data collection, Refinement description