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Humphries A, Speroni S, Eden K, Nolan M, Gilbert C, McNamara J. Horseshoe kidney: Morphologic features, embryologic and genetic etiologies, and surgical implications. Clin Anat 2023; 36:1081-1088. [PMID: 36708162 DOI: 10.1002/ca.24018] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 01/18/2023] [Accepted: 01/22/2023] [Indexed: 01/29/2023]
Abstract
The horseshoe kidney (HSK) is the most common congenital abnormality of the upper urinary tract with an incidence of approximately 1 in 500 in the general population. Although individuals with HSK are often asymptomatic, they are at increased risk for neoplasms, infections, ureteropelvic obstruction secondary to lithiasis or vascular compression. Direct injury from trauma is increased in these individuals as is the risk of intraoperative complications secondary to damage involving the typically complex renal or adrenal vascular supply. We briefly review etiological factors including renal and urinary system embryology, genetic mutations, abnormalities related to faulty cell signaling, aberrant cell migration, and other possible causes including environmental exposures and trauma. In addition, we call attention to factors that might influence the success of surgical procedures in patients with HSK. We argue that an understanding of possible etiologies of the HSK and its different subtypes may be useful when planning surgical procedures or considering risk-benefit ratios associated with different surgical options. We briefly present the organization of a HSK in a 100-year-old male demonstrating an unusual vascular supply discovered during a dissection laboratory session in a medical school anatomy course. We describe the structure of the HSK, the position and relationships of the HSK to other structures within the abdomen, and the associated vascular relationships.
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Affiliation(s)
- Audrey Humphries
- Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
| | - Samantha Speroni
- Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
| | - Kristin Eden
- Department of Basic Sciences Education, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
| | - Michael Nolan
- Department of Basic Sciences Education, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
| | - Carol Gilbert
- Department of Basic Sciences Education, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
| | - John McNamara
- Department of Basic Sciences Education, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
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Jean Paul A, Louis D, Desravines AJ, Jean RM, Jean Baptiste A, Buteau JH, Andre W. Suspicion of Frasier's Syndrome in the Nephrology Unit of the State University Hospital of Haiti: Case Study and Review of Literature. Int Med Case Rep J 2021; 14:533-538. [PMID: 34408503 PMCID: PMC8367082 DOI: 10.2147/imcrj.s325619] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Accepted: 07/29/2021] [Indexed: 02/05/2023] Open
Abstract
Objective Frasier syndrome is a rare genetic nephropathy characterized by the presence of progressive glomerulopathy with proteinuria associated with male pseudo hermaphroditism. This case study described a picture of a young boy where the clinical suspicion context reminded the Frasier syndrome. To our knowledge, this case is the first described in Haiti. Case Study This is a 19-year-old young phenotypically male, born with a genital anomaly, was seen on referral at the nephrology/dialysis unit of the internal medicine department of the State University Hospital of Haiti for evaluation and follow-up. Insidious progression of symptoms had occurred over 3 years. Over three months of outpatient follow-up, he had four sets of renal labs drawn, and all showed impaired renal function. At the ultrasound, a bilateral cryptorchidism is described in the inguinal, and presence of functional ovaries with follicles of variable size scattered in the parenchyma. So, in the light of these anamnestic, clinical and paraclinical findings, we concluded to the diagnosis of end-stage renal failure by progressive glomerulopathy in a context of Frasier's syndrome. Conclusion With any clinical picture consisting of genital anomalies at birth, renal symptomatology during childhood and the diagnosis of renal failure during adolescence, rare genetic nephropathies, such as Frasier syndrome must be considered.
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Affiliation(s)
- Axler Jean Paul
- General Medicine, State University Hospital of Haiti, Port-au-Prince, West, Haiti
| | - Dieuguens Louis
- Internal Medicine, State University Hospital of Haiti, Port-au-Prince, West, Haiti
| | | | - Raema Mimrod Jean
- General Medicine, State University Hospital of Haiti, Port-au-Prince, West, Haiti
| | | | - Jean Henold Buteau
- Internal Medicine, State University Hospital of Haiti, Port-au-Prince, West, Haiti
| | - Wislet Andre
- Internal Medicine, State University Hospital of Haiti, Port-au-Prince, West, Haiti
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Haider I, Kumar C, Jain G, Bakhshi S, Kumar L, Chopra A, Ranjan A, Tanwar P. Hotspots mutational analysis of Wilms tumor 1 gene in acute myeloid leukaemia; prevalence and clinical correlation in North Indian population. AMERICAN JOURNAL OF BLOOD RESEARCH 2020; 10:179-189. [PMID: 33224562 PMCID: PMC7675118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 09/02/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND The pathogenic role of Wilms tumor 1 gene (WT1) is well known in renal cancer. However, recently, its over expression is been documented in cases of acute myeloid leukaemia (AML), acute lymphoblastic leukaemia (ALL) and myelodysplastic syndrome (MDS). WT1 mutations is found in about 6%-15% of cases of AML affecting mainly hotspot exon 7 and 9, and less frequently in other exon such as 1, 2, 3, and 8. Different studies have shown equivocal findings with few of them depicting poorer prognosis, while others suggesting lack of any significant clinical impact. OBJECTIVE This study was planned to evaluate prevalence of WT1 gene mutation on exon 7 & 9 in de novo cases of AML and its correlation with their clinical features and disease course. METHODOLOGY A total of newly diagnosed and treatment naive 100 cases of AML, having blast count of ≥20% in peripheral blood or bone marrow were enrolled. Genomic DNA of all participants was extracted from blood/bone marrow sample using Qiagen® DNA extraction kit. Haematological workup for counts and flow cytometry based immunophenotypes was done. Mutation on exon 7 & 9 were detected with the help of Sanger sequencing. RESULTS WT1 mutations were detected in both types of cases having normal vs. abnormal cytogenetics. The overall prevalence of WT1 mutation of 2% was found. We have reported one novel mutation on exon 9 of WT1 gene. Twelve cases (12%) among all analyzed AMLs were found to have synonymous single nucleotide polymorphism (SNPs) on exon 7 which has been previously reported in SNP database (rs16754). CONCLUSION In our study, presence of synonymous SNP was not associated with any change at protein level. We also evaluated mutational status with deaths during induction remission and concluded that presence of WT1 gene mutation was associated with death during induction therapy.
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Affiliation(s)
- Imran Haider
- Laboratory Oncology Unit, Dr. B. R. A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi-110029, India
| | - Chandan Kumar
- Laboratory Oncology Unit, Dr. B. R. A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi-110029, India
| | - Garima Jain
- Laboratory Oncology Unit, Dr. B. R. A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi-110029, India
| | - Sameer Bakhshi
- Department of Medical Oncology, Dr. B. R. A. Institute Rotary Cancer Hospital All India Institute of Medical SciencesNew Delhi-110029, India
| | - Lalit Kumar
- Department of Medical Oncology, Dr. B. R. A. Institute Rotary Cancer Hospital All India Institute of Medical SciencesNew Delhi-110029, India
| | - Anita Chopra
- Laboratory Oncology Unit, Dr. B. R. A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi-110029, India
| | - Amar Ranjan
- Laboratory Oncology Unit, Dr. B. R. A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi-110029, India
| | - Pranay Tanwar
- Laboratory Oncology Unit, Dr. B. R. A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi-110029, India
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Goel H, Rahul E, Gupta AK, Meena JP, Chopra A, Ranjan A, Hussain S, Rath GK, Tanwar P. Molecular update on biology of Wilms Tumor 1 gene and its applications in acute myeloid leukemia. AMERICAN JOURNAL OF BLOOD RESEARCH 2020; 10:151-160. [PMID: 33224559 PMCID: PMC7675129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Accepted: 09/16/2020] [Indexed: 06/11/2023]
Abstract
Wilms tumor gene 1 (WT1) is an important gene which is involved in growth and development of many organs. It is identified as a tumor suppressor gene in nephroblastoma. However, its role as a tumor oncogene has been highlighted by many studies in haematological as well as non haematological malignant neoplasm. The expression of WT1 on leukemic blast cells sensitised us to explore its impact on neoplastic phenomenon. WT1 is has been found both mutated as well as over expressed in different subsets of acute myeloid leukemia (AML). WT1 is a gene has been used as a biomarker for diagnosis, monitoring of minimal residual disease (MRD) and detection of relapse for molecular remission in AML. It also has potential of being a predictive molecular predictive biomarker for the treatment of leukemic cases after allogeneic transplantation. The WT1 specific expression on blast cells and its interaction with cytotoxic T cell has also been explored for its potential usage WT1 based immunotherapy. Here, we are reviewing molecular updates of WT1 gene and discuss its potential clinical applications as a predictive molecular biomarker for diagnosis, as MRD detection and as immunotherapy in AML.
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Affiliation(s)
- Harsh Goel
- Laboratory Oncology Unit, Dr. B.R.A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi 110029, India
| | - Ekta Rahul
- Laboratory Oncology Unit, Dr. B.R.A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi 110029, India
| | - Aditya Kumar Gupta
- Department of Pediatrics, All India Institute of Medical SciencesNew Delhi 110029, India
| | - Jagdish Prasad Meena
- Department of Pediatrics, All India Institute of Medical SciencesNew Delhi 110029, India
| | - Anita Chopra
- Laboratory Oncology Unit, Dr. B.R.A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi 110029, India
| | - Amar Ranjan
- Laboratory Oncology Unit, Dr. B.R.A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi 110029, India
| | - Showket Hussain
- Division of Molecular Oncology, National Institute of Cancer Prevention & Research I-7Sector-39, NOIDA-201301, India
| | - GK Rath
- All India Institute of Medical ScincesNew Delhi, India
| | - Pranay Tanwar
- Laboratory Oncology Unit, Dr. B.R.A. Institute Rotary Cancer Hospital, All India Institute of Medical SciencesNew Delhi 110029, India
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Nishikawa T, Wojciak JM, Dyson HJ, Wright PE. RNA Binding by the KTS Splice Variants of Wilms' Tumor Suppressor Protein WT1. Biochemistry 2020; 59:3889-3901. [PMID: 32955251 DOI: 10.1021/acs.biochem.0c00602] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Wilms' tumor suppressor protein WT1 regulates the expression of multiple genes through binding of the Cys2-His2 zinc finger domain to promoter sites. WT1 has also been proposed to be involved in post-transcriptional regulation, by binding to RNA using the same set of zinc fingers. WT1 has two major splice variants, where the Lys-Thr-Ser (KTS) tripeptide is inserted into the linker between the third and fourth zinc fingers. To obtain insights into the mechanism by which the different WT1 splice variants recognize both DNA and RNA, we have determined the solution structure of the WT1 (-KTS) zinc finger domain in complex with a 29mer stem-loop RNA. Zinc fingers 1-3 bind in a widened major groove favored by the presence of a bulge nucleotide in the double-stranded helical stem. Fingers 2 and 3 make specific contacts with the nucleobases in a conserved AUGG sequence in the helical stem. Nuclear magnetic resonance chemical shift mapping and relaxation analysis show that fingers 1-3 of the two splice variants (-KTS and +KTS) of WT1 form similar complexes with RNA. Finger 4 of the -KTS isoform interacts weakly with the RNA loop, an interaction that is abrogated in the +KTS isoform, and both isoforms bind with similar affinity to the RNA. In contrast, finger 4 is required for high-affinity binding to DNA and insertion of KTS into the linker of fingers 3 and 4 abrogates DNA binding. While finger 1 is required for RNA binding, it is dispensable for binding to consensus DNA sites.
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Affiliation(s)
- Tadateru Nishikawa
- Department of Integrative Structural and Computational Biology and Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Jonathan M Wojciak
- Department of Integrative Structural and Computational Biology and Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - H Jane Dyson
- Department of Integrative Structural and Computational Biology and Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Peter E Wright
- Department of Integrative Structural and Computational Biology and Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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Wang D, Horton JR, Zheng Y, Blumenthal RM, Zhang X, Cheng X. Role for first zinc finger of WT1 in DNA sequence specificity: Denys-Drash syndrome-associated WT1 mutant in ZF1 enhances affinity for a subset of WT1 binding sites. Nucleic Acids Res 2019; 46:3864-3877. [PMID: 29294058 PMCID: PMC5934627 DOI: 10.1093/nar/gkx1274] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 12/22/2017] [Indexed: 12/14/2022] Open
Abstract
Wilms tumor protein (WT1) is a Cys2-His2 zinc-finger transcription factor vital for embryonic development of the genitourinary system. The protein contains a C-terminal DNA binding domain with four tandem zinc-fingers (ZF1-4). An alternative splicing of Wt1 can add three additional amino acids-lysine (K), threonine (T) and serine (S)-between ZF3 and ZF4. In the -KTS isoform, ZF2-4 determine the sequence-specificity of DNA binding, whereas the function of ZF1 remains elusive. Three X-ray structures are described here for wild-type -KTS isoform ZF1-4 in complex with its cognate DNA sequence. We observed four unique ZF1 conformations. First, like ZF2-4, ZF1 can be positioned continuously in the DNA major groove forming a 'near-cognate' complex. Second, while ZF2-4 make base-specific interactions with one DNA molecule, ZF1 can interact with a second DNA molecule (or, presumably, two regions of the same DNA molecule). Third, ZF1 can intercalate at the joint of two tail-to-head DNA molecules. If such intercalation occurs on a continuous DNA molecule, it would kink the DNA at the ZF1 binding site. Fourth, two ZF1 units can dimerize. Furthermore, we examined a Denys-Drash syndrome-associated ZF1 mutation (methionine at position 342 is replaced by arginine). This mutation enhances WT1 affinity for a guanine base. X-ray crystallography of the mutant in complex with its preferred sequence revealed the interactions responsible for this affinity change. These results provide insight into the mechanisms of action of WT1, and clarify the fact that ZF1 plays a role in determining sequence specificity of this critical transcription factor.
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Affiliation(s)
- Dongxue Wang
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - John R Horton
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yu Zheng
- RGENE, Inc., 953 Indiana Street, San Francisco, CA 94107, USA
| | - Robert M Blumenthal
- Department of Medical Microbiology and Immunology, and Program in Bioinformatics, University of Toledo College of Medicine and Life Sciences, Toledo, OH 43614, USA
| | - Xing Zhang
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Xiaodong Cheng
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA.,Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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Hudson NO, Whitby FG, Buck-Koehntop BA. Structural insights into methylated DNA recognition by the C-terminal zinc fingers of the DNA reader protein ZBTB38. J Biol Chem 2018; 293:19835-19843. [PMID: 30355731 DOI: 10.1074/jbc.ra118.005147] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/16/2018] [Indexed: 02/05/2023] Open
Abstract
Methyl-CpG-binding proteins (MBPs) are selective readers of DNA methylation that play an essential role in mediating cellular transcription processes in both normal and diseased cells. This physiological function of MBPs has generated significant interest in understanding the mechanisms by which these proteins read and interpret DNA methylation signals. Zinc finger and BTB domain-containing 38 (ZBTB38) represents one member of the zinc finger (ZF) family of MBPs. We recently demonstrated that the C-terminal ZFs of ZBTB38 exhibit methyl-selective DNA binding within the ((A/G)TmCG(G/A)(mC/T)(G/A)) context both in vitro and within cells. Here we report the crystal structure of the first four C-terminal ZBTB38 ZFs (ZFs 6-9) in complex with the previously identified methylated consensus sequence at 1.75 Å resolution. From the structure, methyl-selective binding is preferentially localized at the 5' mCpG site of the bound DNA, which is facilitated through a series of base-specific interactions from residues within the α-helices of ZF7 and ZF8. ZF6 and ZF9 primarily stabilize ZF7 and ZF8 to facilitate the core base-specific interactions. Further structural and biochemical analyses, including solution NMR spectroscopy and electrophoretic mobility gel shift assays, revealed that the C-terminal ZFs of ZBTB38 utilize an alternative mode of mCpG recognition from the ZF MBPs structurally evaluated to date. Combined, these findings provide insight into the mechanism by which this ZF domain of ZBTB38 selectively recognizes methylated CpG sites and expands our understanding of how ZF-containing proteins can interpret this essential epigenetic mark.
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Affiliation(s)
| | - Frank G Whitby
- Biochemistry, University of Utah, Salt Lake City, Utah 84112
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Ramsawhook A, Ruzov A, Coyle B. Wilms' Tumor Protein 1 and Enzymatic Oxidation of 5-Methylcytosine in Brain Tumors: Potential Perspectives. Front Cell Dev Biol 2018; 6:26. [PMID: 29623275 PMCID: PMC5874295 DOI: 10.3389/fcell.2018.00026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 03/05/2018] [Indexed: 12/24/2022] Open
Abstract
The patterns of 5-methylcytosine (5mC) and its oxidized derivatives, 5-hydroxymethylcytosine, 5-formylcytosine, and 5-carboxylcytosine (5caC) are reportedly altered in a range of cancers. Likewise, Wilms' Tumor protein 1 (WT1), a transcription factor essential for urogenital, epicardium, and kidney development exhibits aberrant expression in multiple tumors. Interestingly, WT1 directly interacts with TET proteins that catalyze the enzymatic oxidation of 5mC and exhibits high affinity for 5caC-containing DNA substrates in vitro. Here we review recent developments in the fields of Tet-dependent 5mC oxidation and WT1 biology and explore potential perspectives for studying the interplay between TETs and WT1 in brain tumors.
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Affiliation(s)
- Ashley Ramsawhook
- Wolfson Centre for Stem Cells, Tissue Engineering and Modelling (STEM), Centre for Biomolecular Sciences, University of Nottingham, Nottingham, United Kingdom
| | - Alexey Ruzov
- Wolfson Centre for Stem Cells, Tissue Engineering and Modelling (STEM), Centre for Biomolecular Sciences, University of Nottingham, Nottingham, United Kingdom
| | - Beth Coyle
- Children's Brain Tumour Research Centre, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, United Kingdom
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Zhang LF, Zheng QC, Zhang HX. Recognition mechanism of Wilms' tumour suppressor protein and DNA triplets: insights from molecular dynamics simulation and free energy analysis. J Biomol Struct Dyn 2018; 37:562-575. [PMID: 29375007 DOI: 10.1080/07391102.2018.1433066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The Wilms' tumour suppressor protein (WT1) plays a multifaceted role in human cancer processes. Mutations on its DNA recognition domain could lead to Denys-Drash syndrome, and alternate splicing results in insertion of the tripeptide Lys-Thr-Ser (KTS) between the third and fourth zinc fingers (ZFs), leading to changes in the DNA-binding function. However, detailed recognition mechanisms of the WT1-DNA complex have not been explored. To clarify the mutational effects upon WT1 towards DNA binding at the atomic level, molecular dynamics simulations and the molecular mechanics/Poisson Boltzmann surface area (MM/PBSA) method were employed. The simulation results indicate that mutations in ZF domains (E427Q and Q369H) may weaken the binding affinity, and the statistical analyses of the hydrogen bonds and hydrophobic interactions show that eight residues (Lys351, Arg366, Arg375, Arg376, Lys399, Arg403, Arg424 and Arg430) have a significant influence on recognition and binding to DNA. Insertion of the tripeptide KTS could form an immobilized hydrogen-bonding network with Arg403, affecting the flexibility and angle of the linker between ZF3 and ZF4, thus influencing the recognition between the protein and the DNA triplet at its 5' terminus. These results represent the first step towards a thorough characterization of the WT1 recognition mechanisms, providing a better understanding of the structure-function relationship of WT1 and its mutants.
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Affiliation(s)
- Ling-Fei Zhang
- a International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , People's Republic of China
| | - Qing-Chuan Zheng
- a International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , People's Republic of China.,b Key Laboratory for Molecular Enzymology & Engineering, The Ministry of Education, School of Life Sciences , Jilin University , Changchun 130023 , People's Republic of China
| | - Hong-Xing Zhang
- a International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , People's Republic of China
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