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The exquisite structure-function correlations observed in filamentous protein assemblies provide a paradigm for the design of synthetic peptide-based nanomaterials. However, the plasticity of quaternary structure in sequence-space and the lability of helical symmetry present significant challenges to the de novo design and structural analysis of such filaments. Here, we describe a rational approach to design self-assembling peptide nanotubes based on controlling lateral interactions between protofilaments having an unusual cross-α supramolecular architecture. Near-atomic resolution cryo-EM structural analysis of seven designed nanotubes provides insight into the designability of interfaces within these synthetic peptide assemblies and identifies a non-native structural interaction based on a pair of arginine residues. This arginine clasp motif can robustly mediate cohesive interactions between protofilaments within the cross-α nanotubes. The structure of the resultant assemblies can be controlled through the sequence and length of the peptide subunits, which generates synthetic peptide filaments of similar dimensions to flagella and pili. Peptide-based filamentous assemblies are successfully used for generation of structurally ordered materials, but their de novo design and structural characterization is challenging. Here, the authors provide a strategy for the design of self-assembling peptide nanotubes based on modifications of an arginine clasp interaction motif, and report the cryo-EM structures of seven designed nanotubes. [ABSTRACT FROM AUTHOR]

To explore the potential effects of race on pathological outcomes of renal tumor and on kidney function preservation in the patients undergoing robotic partial nephrectomy (RPN) at our center. Retrospective review of our institutional review board approved database for African-American (AA) patients undergoing RPN from 2006 to 2014 was performed. AA and non-AA groups were compared with regards to demographics, tumor characteristics, functional data and, oncological outcomes. For functional outcomes, groups were matched (1:1) in terms of age, preoperative estimated glomerular filtration rate (eGFR) and R.E.N.A.L score. From the total of 1005 patients, 84 were AA. Age and the tumor size were comparable between the two groups (2.7 vs. 3 cm; p = 0.29). Proportion of patients with papillary RCC was higher among AAs compared to non-AAs (43.3 vs. 19.4 %; p < 0.001). After matching AA patients with non-AA counterparts (1:1 matching), eGFR preservation at latest follow up after surgery was comparable between groups (84.3 vs. 85 %; p = 0.25). AA race (OR 3.62, p < 0.001), male gender (OR 2.05, p < 0.001) and low preoperative eGFR (OR 0.97, p < 0.001) were predictors of papillary RCC on multivariate analyses. The incidence of papillary RCC is higher in AA patients undergoing RPN. There was no difference in kidney function recovery after robotic partial nephrectomy in both AA and non-AA groups. AA race itself is not a significant factor in determining renal malignancy. Further studies are needed to clarify the impact of higher prevalence of papillary tumors in AA group in terms of long-term oncological and functional outcomes. [ABSTRACT FROM AUTHOR]

To understand Black men’s healthcare and social needs and determine if the resources that healthcare systems offer meet expectations. We surveyed men who had previously participated in at least one Minority Men’s Health Fair in Cleveland, Ohio. In this descriptive study, we spoke with men up to three times (i.e., phases) between May and October 2020 by email and/or telephone. Phase 1 was a needs assessment survey. Phase 2 involved outreach to those who identified a need to provide a resource. Phase 3 determined whether the resource met individuals’ needs. We described the demographic characteristics of the survey respondents, the percentage of men reporting a need and wanting a resource, and whether the resource resolved their need. Of the 768 men contacted, 275 completed the survey (36% response rate). The majority of respondents were 50–69 years old, identified as Black, and had at least a bachelor’s degree. Eighty-five percent reported a need, of which wellness, financial, and healthcare access were among the top-reported needs. Among the men identifying a need, 35% were interested in a resource. Resources that were provided for employment, behavioral health, oral health, vision, or wellness needs were deemed insufficient. A few individuals reported that resources for food/personal hygiene, financial support, health care access, annual health screening, and medication met their needs. Among men with healthcare and social needs, only a fraction were interested in a resource, and fewer reported that the resource met their needs. These results warrant a greater understanding of what constitutes a resolution of healthcare and social needs from patients’ perspectives. [ABSTRACT FROM AUTHOR]