#Question id: 12720
#Unit 6. System Physiology – Plant
#Question id: 12721
#Unit 6. System Physiology – Plant
There are the five groups of late embryogenesis abundant (LEA) proteins found in plants
Group
(family name) |
Functional information |
I) Group 1 (D-19 family) |
a) It is an
abundant protein in cotton embryos, Each putative dimer of this group may
bind as many as ten inorganic phosphates and their counterions |
II) Group 2 (D-11 family) |
b) Possibly functions in ion
sequestration to protect cytosolic metabolism When LE25 is expressed in
yeast, it confers salt and freezing tolerance |
III) Group 3 (D-7 family) |
c) In tomato, a
gene encoding a similar protein is expressed in response to nematode feeding |
IV) Group 4 (D-95 family) |
d) Contains more
water of hydration than typical globular proteins Overexpression confers
water deficit tolerance on yeast cells |
V) Group 5 (D-113 family) |
e) Often
localized to the cytoplasm or nucleus More acidic members of the family are
associated with the plasma membrane May act to stabilize macromolecules at
low water potential |
#Question id: 12722
#Unit 6. System Physiology – Plant
#Question id: 12723
#Unit 6. System Physiology – Plant
#Question id: 12724
#Unit 6. System Physiology – Plant
In response to sudden, 5 to 10°C rises in temperature, plants produce a unique set of proteins referred to as heat shock proteins (HSPs). There are five classes of heat shock proteins found in plants such as;
HSP class |
Examples
(Arabidopsis / prokaryotic) |
Cellular location |
I) HSP100 |
a) AtTCP-1 /
GroEL, GroES |
i) Cytosol |
II) HSP90 |
b) Various
AtHSP22, AtHSP20, AtHSP18.2, AtHSP17.6 / IBPA/B |
ii) mitochondria |
III) HSP70 |
c) AtHSP101 /
ClpB, ClpA/C |
iii) chloroplasts |
IV) HSP60 |
d) AtHSP70 /
DnaK |
iv) endoplasmic
reticulum |
V) smHSP |
e) AtHSP90 /
HtpG |
|
Match the following HSPs with their correct location and the examples of the HSPs;
#Question id: 27687
#Unit 6. System Physiology – Plant
Precursor of GB is