| 11. |
- Guzman, Ulises H., et al.
(författare)
-
Loss of N-terminal acetyltransferase A activity induces thermally unstable ribosomal proteins and increases their turnover in Saccharomyces cerevisiae
- 2023
-
Ingår i: Nature Communications. - 2041-1723. ; 14:1
-
Tidskriftsartikel (refereegranskat)abstract
- Protein N-terminal (Nt) acetylation is one of the most abundant modifications in eukaryotes, covering ~50-80 % of the proteome, depending on species. Cells with defective Nt-acetylation display a wide array of phenotypes such as impaired growth, mating defects and increased stress sensitivity. However, the pleiotropic nature of these effects has hampered our understanding of the functional impact of protein Nt-acetylation. The main enzyme responsible for Nt-acetylation throughout the eukaryotic kingdom is the N-terminal acetyltransferase NatA. Here we employ a multi-dimensional proteomics approach to analyze Saccharomyces cerevisiae lacking NatA activity, which causes global proteome remodeling. Pulsed-SILAC experiments reveals that NatA-deficient strains consistently increase degradation of ribosomal proteins compared to wild type. Explaining this phenomenon, thermal proteome profiling uncovers decreased thermostability of ribosomes in NatA-knockouts. Our data are in agreement with a role for Nt-acetylation in promoting stability for parts of the proteome by enhancing the avidity of protein-protein interactions and folding.
|
|
| 12. |
- Hougaard, Jesper Leth, et al.
(författare)
-
The nerve fibre layer symmetry test: computerized evaluation of human retinal nerve fibre layer thickness as measured by optical coherence tomography
- 2004
-
Ingår i: Acta Ophthalmologica Scandinavica. - : Wiley. - 1395-3907 .- 1600-0420. ; 82:4, s. 410-418
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose: To present and test a new interpretative concept, the nerve fibre layer symmetry test (NST), for computerized evaluation of retinal nerve fibre layer thickness (RNFLT) as measured by optical coherence tomography (OCT) in glaucoma. Methods: The NST concept was constructed and tested in a pilot study. A total of 32 healthy and 40 age-matched glaucomatous eyes were included and examined by OCT, computerized perimetry, RNFL/disc photography, tonometry and a general ophthalmologic examination. Results: The observed NST sensitivity and specificity were high, at 38/40 eyes (95%) and 32/32 eyes (100%), respectively, and 40/40 eyes (100%), and 31/32 eyes (97%), respectively, when correcting the OCT RNFLT measurement for the influence of variability in image signal/quality. The NST sensitivity was 8-10% higher than the single most sensitive traditional OCT RNFLT parameter; this difference was not statistically significant in this small sample. Conclusion: The NST showed high specificity and sensitivity for detection of RNFLT attenuation indicating early to severe glaucoma. Although promising, the NST needs to be further developed and validated in larger study samples and in patients with various stages of glaucomatous damage.
|
|
| 13. |
- Krogh, Jesper, et al.
(författare)
-
Growth hormone, prolactin and cortisol response to exercise in patients with depression
- 2010
-
Ingår i: Journal of Affective Disorders. - : Elsevier BV. - 1573-2517 .- 0165-0327. ; 125:1-3, s. 189-197
-
Tidskriftsartikel (refereegranskat)abstract
- Background: A blunted growth hormone and prolactin response to pharmacological stress test have previously been found in depressed patients, as well as an increased cortisol response to psychosocial stress. This study investigated these hormones in response to acute exercise using an incremental bicycle test. Method: A cross-sectional comparison of cortisol, growth hormone, and prolactin in depressed (n = 137) and healthy (n = 44) subjects during rest and in response to an incremental bicycle test. Secondly, we tested the depressed patients again after a 4-month randomized naturalistic exercise intervention. Results: Resting plasma levels of growth hormone (GH), cortisol, or prolactin (PRL) did not differ between depressed and healthy subjects (all p-values > .12). In response to an incremental bicycle test the GH (p = .02) and cortisol (p = .05) response in depressed was different compared to healthy controls. The effect of acute exercise stress on PRL (p = .56) did not differ between depressed and healthy subjects. Apart from a decrease in CH response in the strength-training group (p = .03) the pragmatic exercise intervention did not affect resting hormonal levels, or the response to acute exercise. Conclusions: Patients with mild to moderate depression had a different growth hormone and cortisol response to acute exercise stress compared to healthy controls. Strength training was able to reduce the growth hormone response to acute exercise stress in this patient population. Studies with more rigorous inclusion criteria and higher exercise frequencies are needed to evaluate and confirm the possible effect of exercise in depressed subjects. (C) 2010 Elsevier B.V. All rights reserved.
|
|
| 14. |
- Krogh, Jesper, et al.
(författare)
-
N-terminal pro-atrial natriuretic peptide response to acute exercise in depressed patients and healthy controls
- 2011
-
Ingår i: Psychoneuroendocrinology. - : Elsevier BV. - 1873-3360 .- 0306-4530. ; 36:5, s. 656-663
-
Tidskriftsartikel (refereegranskat)abstract
- Background: The dysfunction of hypothalamic-pituitary-adrenal (HPA) axis in major depression includes hyperactivity and reduced feedback inhibition. Atrial natriuretic peptide (ANP) is able to reduce the HPA-axis response to stress and has an anxiolytic effect in rodents and humans. We hypothesized that patients with depression would have an attenuated N-terminal proANP (NT-proANP) response to acute exercise compared to healthy controls. Secondly, we aimed to assess the effect of antidepressants on NT-proANP response to acute exercise. Methods: We examined 132 outpatients with mild to moderate depression (ICD-10) and 44 healthy controls, group matched for age, sex, and BMI. We used an incremental bicycle ergometer test as a physical stressor. Blood samples were drawn at rest, at exhaustion, and 15, 30, and 60 min post-exercise. Results: The NT-proANP response to physical exercise differed between depressed subjects and healthy controls (group x time; F-4,F-162.9 = 10.92; p < 0.001). The increase from rest to VO2max was 0.98 (SD 0.8) and 1.96 nmol/l (SD 1.1), respectively, for depressed subjects and healthy controls (mean diff: 0.98 nmol/l; 95% CI 0.7-1.3; t = 6.63; df = 170; p < 0.001). The increase in NT-proANP from rest to peak VO2max was 1.27 (SD 1.0) and 0.84 nmol/l (SD 0.6), respectively, for unmedicated and medicated patients (mean diff: 0.42 nmol/l; 95% CI 0.1-0.8; t = 2.56; df = 128; p = 0.01). Conclusion: We observed an attenuated NT-proANP response to acute physical stress in depressed patients. Antidepressants were associated with an independent suppressive effect on the NT-proANP response. (c) 2010 Elsevier Ltd. All rights reserved.
|
|
| 15. |
- Krogh, Jesper Wisborg
(författare)
-
Development and Implementation of Methods in Theoretical Chemistry
- 2006
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The method development research in the field of theoretical chemistry is the never ending quest for methods that are faster, gives more accurate results, and expands the possibilities. The work in this thesis is no exception to that statement. Thus a CI routine more suited for calculations on large active spaces was implemented in the RASSCF code of Molcas; a new scheme for localizing multipole moments and polarizabilities were developed and implemented; and a parallel SCF code that provides super linear speed up saw the light of the day. These implementations were largely used throughout the remainder of the work, where the nuclear quadrupole moment of tin and the electronic spectrum of UO2 were determined; the photodissociation of bromoiodomethane was investigated; and the ability of localized properties to reproduce the electrostatic potential was tested.
|
|
| 16. |
|
|
| 17. |
- Krogh, Jesper Wisborg, et al.
(författare)
-
The condensation energy of the homogeneous superconducting gas.
- 2003
-
Ingår i: Computer Physics Communications. - 0010-4655. ; 150:1, s. 53-63
-
Tidskriftsartikel (refereegranskat)abstract
- We present CHS, a computer program designed to calculate the condensation energy of the homogeneous superconducting electron gas. The correlation energy, which we treat at the level of the RPA, is an essential ingredient for the construction of a local density approximation in the framework of density functional theory for superconductors (SCDFT) [Kurth et al., Phys. Rev. Lett. 83 (1999) 2628].
|
|
| 18. |
- Krogh, Jesper Wisborg, et al.
(författare)
-
The prediction of the nuclear quadrupole splitting of Sn-119 Mossbauer spectroscopy data by scalar relativistic DFT calculations
- 2006
-
Ingår i: Chemistry - A European Journal. - : Wiley. - 0947-6539 .- 1521-3765. ; 12:19, s. 5116-5121
-
Tidskriftsartikel (refereegranskat)abstract
- The electric field gradient components for the tin nucleus of 34 tin compounds of experimentally known structures and Sn-119 Mossbauer spectroscopy parameters were computed at the scalar relativistic density functional theory level of approximation. The theoretical values of the electric field gradient components were used to determine a quantity, V, which is proportional to the nuclear quadrupole splitting parameter (Delta E). In a subsequent linear regression analysis the effective nuclear quadrupole moment, Q, was evaluated. The value of (11.9 +/- 0.1) fm(2) is a significant improvement over the non-relativistic result of (15.2 +/- 4.4) fm(2) and is in agreement with the experimental value of (10.9 +/- 0.8) fm(2). The average mean square error Delta E-calcd-Delta E-exptl = +/- 0.3 mm s(-1) is a factor of two smaller than in the non-relativistic case. Thus, the approach has a quality which provides accurate support for the structure interpretation by Sn-119 spectroscopy. It was noted that geometry optimization at the relativistic level does not significantly increase the quality of the results compared with non-relativistic optimized structures. The accuracy in the approach called on us to consider the singlet-triplet state nature of the electronic structure of one of the investigated compounds.
|
|
| 19. |
- Krogh, Kristian B. R. M., et al.
(författare)
-
Characterization and kinetic analysis of a thermostable GH3 beta-glucosidase from Penicillium brasilianum
- 2010
-
Ingår i: Applied Microbiology and Biotechnology. - : Springer Science and Business Media LLC. - 1432-0614 .- 0175-7598. ; 86:1, s. 143-154
-
Tidskriftsartikel (refereegranskat)abstract
- A GH3 beta-glucosidase (BGL) from Penicillium brasilianum was purified to homogeneity after cultivation on a cellulose and xylan rich medium. The BGL was identified in a genomic library, and it was successfully expressed in Aspergillus oryzae. The BGL had excellent stability at elevated temperatures with no loss in activity after 24 h of incubation at 60A degrees C at pH 4-6, and the BGL was shown to have significantly higher stability at these conditions in comparison to Novozym 188 and to other fungal GH3 BGLs reported in the literature. The BGL had significant lower affinity for cellobiose compared with the artificial substrate para-nitrophenyl-beta-d-glucopyranoside (pNP-Glc) and further, pronounced substrate inhibition using pNP-Glc. Kinetic studies demonstrated the high importance of using cellobiose as substrate and glucose as inhibitor to describe the inhibition kinetics of BGL taking place during cellulose hydrolysis. A novel assay was developed to characterize this glucose inhibition on cellobiose hydrolysis. The assay uses labelled glucose-C-13(6) as inhibitor and subsequent mass spectrometry analysis to quantify the hydrolysis rates.
|
|
| 20. |
- Krogh, K.B.R.M., et al.
(författare)
-
Characterization and kinetic analysis of a thermostable GH3 β-glucosidase from Penicillum brasilianum
- 2010
-
Ingår i: Applied Microbiology and Biotechnology. - : Springer Science and Business Media LLC. - 1432-0614 .- 0175-7598. ; 86:86, s. 143-154
-
Tidskriftsartikel (refereegranskat)abstract
- A GH3 β-glucosidase (BGL) from Penicillum brasilianum was purified to homogeneity after cultivation on a cellulose and xylan rich medium. The BGL was identified in a genomic library, and it was successfully expressed in Aspergillus oryzae. The BGL had excellent stability at elevated temperatures with no loss in activity after 24 h of incubation at 60°C at pH 4-6, and the BGL was shown to have significantly higher stability at these conditions in comparison to Novozym 188 and to other fungal GH3 BGLs reported in the literature. The BGL had significant lower afinity for cellobiose compared with the artificial substrate para-nitrophenyl-β-D-glucopyranoside (pNP-Glc)and further, pronounced substrate inhibition using p-NP-Glc. Kinetic studies demonstrated the high importance of using cellbiose as substrate and glucose as inhibitor to describe the inhibition kinetics of BGL taking place during cellulose hydrolysis. A novel assay was developed to characterize this glucose inhibition on cellobiose hydrolosis. The assay uses labelled glucose-13C6 as inhibitor and subsequent mass spectrometry analysis to quantify the hydrolysis rates
|
|
