AtHsp21.7.
This subsection of the Names and taxonomy section indicates the name (s) of the gene (s) that code for the protein sequence (s) described in the entry.

Identification of core subunits of photosystem II as action sites of HSP21, which is activated by the GUN5‐mediated retrograde pathway in Arabidopsis Identiﬁcation of core subunits of photosystem II as action sites of HSP21, which is activated by the GUN5-mediated retrograde pathway in Arabidopsis

We show that an Arabidopsis thaliana knockout mutant of HSP21 had an ivory phenotype under heat stress. Quantitative real-time RT-PCR, run-on transcription, RNA gel blot, and polysome association analyses demonstrated that HSP21 is involved in plastid-encoded RNA polymerase (PEP)–dependent transcription. Anti-Hsp21 (Arabidopsis) antibody, HSP21 | chloroplastic heat shock protein antibodies, AS08 285, P31170heat shock is an environmental stress when the organism or cell is subjected to a temperature higher than the optimal one. HSP21.7 - 21.7 kDa class VI heat shock protein - Arabidopsis thaliana (Mouse-ear cress) - HSP21.7 gene & protein UniProtKB - Q9FIT9 (HS217_ARATH) The nuclear-encoded chloroplast protein HSP21 (monomer size 21 kDa, also known as HSP25.3-P (ref. 18)) is a plastid-localized sHSP in Arabidopsis 19.

-. 10.04. 1.61. During phase I, we showed that the small chloroplast localised heat shock protein HSP21 plays a crucial role for long-term thermomemory in Arabidopsis kDa oligomeric Hsp21 protein during moderate heat stress (<40?C) of Arabidopsis plants, as judged b mobility in non-denaturing electrophoresis.

Sep 22, 2017 Arabidopsis thaliana mutants with constitutively decreased Clp proteolytic As shown in S2 Fig, genes encoding Hsp21, ClpB3, and the two HSP21 is encoded in Arabidopsis by a single gene whose coding region is Under abrupt stress conditions the HSP21 transcript is somewhat longer than List of Arabidopsis genes (36 genes) annotated as small heat shock proteins ( sHSPs) or. HSP20-like chaperones AT4G27670 HSP21.

Loss-of-function analyses in Arabidopsis indicate that HSP21 is essential for chloroplast development under heat stress through maintaining PEP function. Furthermore, we show that HSP21 interacts with plastid nucleoid protein pTAC5, which is also essential for maintaining PEP function under heat stress.

Physiological evidence suggests that the small chloroplast heat‐shock protein 21 (HSP21) is involved in plant thermotolerance, but the molecular mechanism of its action remains largely unknown. Here, we have provided genetic and biochemical evidence that HSP21 is activated by the GUN5‐dependent retrograde signaling pathway, and stabilizes PSII by Loss-of-function analyses in Arabidopsis indicate that HSP21 is essential for chloroplast development under heat stress through maintaining PEP function.

2001-01-15

Importance of Hsp21 in stress protection of transgenic Arabidopsis thaliana, recombinant expression and characterization of oxidation-dependent conformational changes.

Here we show that Arabidopsis HSP21, a plastidial small heat shock protein that rapidly accumulates after heat stress and remains abundant during the thermomemory phase, is a crucial component of thermomemory. Sustained memory requires that HSP21 levels remain high. The Arabidopsis proteins RAR1 and SGT1 are required for the action of many R proteins, and display some structural similarity to HSP90 co‐chaperones. Each associates with HSP90 in plant cells. Our data suggest that (i) RPM1 is an HSP90 client protein; and (ii) RAR1 and SGT1 may function independently as HSP90 cofactors. kDa oligomeric Hsp21 protein during moderate heat stress (<40?C) of Arabidopsis plants, as judged b mobility in non-denaturing electrophoresis.
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Here, we have provided genetic and biochemical evidence that HSP21 is activated by the GUN5‐dependent retrograde signaling pathway, and stabilizes PSII by Chloroplast small heat shock protein HSP21 interacts with plastid nucleoid protein pTAC5 and is essential for chloroplast development in Arabidopsis under heat stress. Compared with small heat shock proteins (sHSPs) in other organisms, those in plants are the most abundant and diverse. However, the molecular mechanisms by which sHSPs are involved A Chloroplast Localized Small Heat Shock Protein, Hsp21.

"Chloroplast small heat shock protein HSP21 interacts with plastid nucleoid protein pTAC5 and is essential for chloroplast development in Arabidopsis under heat stress." Zhong L., Zhou W., Wang H., Ding S., Lu Q., Wen X., Peng L., Zhang L., Lu C. The chloroplast-localized sHsp, named Hsp21 with reference to its monomeric size, has an N-terminal region that is some 40 amino acids longer compared to the cytosolic sHsps, and increases plant stress tolerance as shown by Arabidopsis thaliana plants which overexpress Hsp21.
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Encodes Hsp21, a chloroplast located small heat shock protein. A structure model of Hsp21, obtained by homology modeling, single-particle electron microscopy, and lysine-specific chemical crosslinking, shows that the Hsp21 subunits are arranged in two hexameric discs, rotated by 25 degree in relation to each other. TAIR Short Description