The 49-residue functional upstream domain (FUD) of Streptococcus pyogenes F1 adhesin interacts with fibronectin (FN) in a heretofore unknown manner that prevents assembly of a FN matrix. Biotinylated FUD (b-FUD) bound to adsorbed FN or its recombinant N-terminal 70-kDa fibrin- and gelatin-binding fragment (70K). Binding was blocked by FN or 70K, but not by fibrin- or gelatin-binding subfragments of 70K. Isothermal titration calorimetry showed that FUD binds with Kd values of 5.2 and 59 nm to soluble 70K and FN, respectively. We tested sets of FUD mutants and epitope-mapped monoclonal antibodies (mAbs) for ability to compete with b-FUD for binding to FN or to block FN assembly by cultured fibroblasts. Deletions or alanine substitutions throughout FUD caused loss of both activities. mAb 4D1 to the 2FNI module had little effect, whereas mAb 7D5 to the 4FNI module in the fibrin-binding region, 5C3 to the 9FNI module in the gelatin-binding region, or L8 to the G-strand of 1FNIII module adjacent to 9FNI caused loss of binding of b-FUD to FN and decreased FN assembly. Conversely, FUD blocked binding of 7D5, 5C3, or L8, but not of 4D1, to FN. Circular dichroism indicated that FUD binds to 70K by β-strand addition, a possibility supported by modeling based on crystal structures of peptides bound to 2FNI-5FNI of the fibrin-binding domain and 8FNI-9FNI of the gelatin-binding domain. Thus, the interaction likely involves an extensive anti-parallel β-zipper in which FUD interacts with the E-strands of 2FNI-5FNI and 8FNI-9FNI.

Background: Conversion of fibronectin from a compact plasma protein to a fibrillar component of extracellular matrix is not understood. Results: Binding of polypeptides by ␤-strand addition to N-terminal modules 1-5 FNI is linked to changes in distant integrin-and glycosaminoglycan-binding regions. Conclusion: Ligation of 1-5 FNI is sufficient for fibronectin expansion. Significance: Allosteric interactions among regions of fibronectin control assembly into extracellular fibrils.

PAGE 22885:In the left hand column, eight lines from the top, the sentence should read as follows: UV-visible spectroscopy can detect P. denitrificans cytochrome c 550 via the Soret peak at concentrations down to 3 ϫ10 Ϫ8 M, and heme staining can detect ϳ1 ϫ 10 Ϫ12 mol of cytochrome c 550 . Identification of a gene essential for the first committed step in the biosynthesis of bacteriochlorophyll c. Zhenfeng Liu and Donald A. BryantThe locus tag for the bciC gene of Candidatus Chloracidobacterium thermophilum was indicated as Cabther_B0031 throughout the text and in Fig. 3. The correct locus tag for this bciC gene is Cabther_B0081. THE JOURNAL OF BIOLOGICAL CHEMISTRY VOL. 286, NO. 33, p. 29442, August 19, 2011 © 2011 by The American Society for Biochemistry and Molecular Biology, Inc. Printed in the U.S.A. JOURNAL OF BIOLOGICAL CHEMISTRY ADDITIONS AND CORRECTIONS This paper is available online at www.jbc.orgWe suggest that subscribers photocopy these corrections and insert the photocopies in the original publication at the location of the original article. Authors are urged to introduce these corrections into any reprints they distribute. Secondary (abstract) services are urged to carry notice of these corrections as prominently as they carried the original abstracts.

Objective To retrospectively evaluate the safety and efficacy of percutaneous image-guided mediastinal mass core-needle biopsy. Patients and Methods Retrospective review of an institutionally maintained biopsy registry identified 337 computed tomography– or ultrasound-guided percutaneous mediastinal mass core needle biopsies between October 2002 and August 2017 in a single quaternary referral center. Mean patient age was 51 (range, 18 to 93) years. Procedural techniques, anticoagulation/antiplatelet therapy, and tumor anatomical characteristics were reviewed. Classification and gradation of complications was based on the Clavien-Dindo system. Diagnostic yield was defined as the ratio of diagnostic biopsy to all biopsies performed. Results Mean tumor size was 59.2 (range, 10 to 180) mm with 89.9% (n=303) of lesions located in the prevascular (anterior) mediastinum. There was a single major complication (0.3%) of a symptomatic pneumothorax requiring intervention. There were seven (2.1%) minor complications, including three bleeding complications. A transpleural approach was the only variable associated with an increased complication rate ( P <.01). Forty-one (12.2%) patients had a biopsy performed while taking an antiplatelet/anticoagulant agent within the therapeutic window, with a single case (0.3%) associated with a minor bleeding complication. Of 18 (5.3%) procedures performed without cessation of anticoagulant/antiplatelet therapy, there were no bleeding complications. Of all 337 biopsies, 322 (95.5%) were diagnostic. None of the analyzed variables were significantly associated with a nondiagnostic biopsy. Conclusion Image-guided percutaneous core-needle biopsy of mediastinal masses is a safe procedure with high diagnostic yield. Further prospective studies are required to assess the complication profile in higher risk patients.

Preoperative pulmonary embolism is not associated with worse early mortality, recurrence or cancer specific survival in patients with renal cell carcinoma and tumor thrombus.

433 Background: Renal cell carcinoma (RCC) patients who present with pulmonary embolism (PE) and venous thrombus may not be offered surgery because of concerns with anti-coagulation and presumed poor post-surgical outcomes. The objective of this study was to evaluate post-surgical recurrence and disease specific survival (DSS) in RCC patients with venous thrombus who had PE diagnosed at initial presentation. Methods: After IRB approval, we reviewed the records from 2000-2011 at 3 tertiary hospitals (UW, UTMDACC, UTSW) for all consecutive RCC patients who had nephrectomy with thrombectomy. Clinical and pathologic predictive factors for recurrence and survival were collected for each patient. Univariate and multivariate analysis was used to evaluate whether PE at presentation was associated with RCC recurrence or DSS after nephrectomy with thrombectomy. Results: Preoperative PE was diagnosed in 35/782 (0.5%) RCC patients undergoing nephrectomy with thrombectomy with a median follow-up time of 22 months. Patients with PE at initial diagnosis were more likely to have higher level thrombus (p<0.01) but no differences were found between groups for age, gender, race, tumor diameter, Fuhrman grade, sarcomatoid de-differentiation, peri-nephric fat invasion or histologic subtype. In N0M0 patients, there was no difference (p=0.36) in the rate of RCC recurrence for 395/782(50%) or 7/17(41%) patients without PE or with PE respectively. On multivariate analysis, peri-nephric fat invasion, Fuhrman grade, and thrombus height, but not preoperative PE status, were predictive of recurrence risk. Similarly, there was no difference in the rates of lung metastases for 67/123 (53%) N0M0 patients without PE or 3/7 (43%) patients with PE (p=0.71). Preoperative PE diagnosis was not predictive of death from RCC (p=0.58). On multivariate analysis, peri-nephric fat invasion, sarcomatoid de-differentiation, Fuhrman grade, and thrombus height, were independently predictive of risk of death from RCC. Conclusions: PE at initial diagnosis is not associated with worse post-surgical recurrence or survival in RCC patients with tumor thrombus.

No abstract