Secondary substrate binding strongly affects activity and binding affinity ofBacillus subtilisandAspergillus nigerGH11 xylanases
نویسندگان
چکیده
منابع مشابه
Low Affinity and Slow Na+ Binding Precedes High Affinity Aspartate Binding in the Secondary-active Transporter GltPh.
GltPh from Pyrococcus horikoshii is a homotrimeric Na(+)-coupled aspartate transporter. It belongs to the widespread family of glutamate transporters, which also includes the mammalian excitatory amino acid transporters that take up the neurotransmitter glutamate. Each protomer in GltPh consists of a trimerization domain involved in subunit interactions and a transport domain containing the sub...
متن کاملThe topology of the substrate binding clefts of glycosyl hydrolase family 10 xylanases are not conserved.
The crystal structures of family 10 xylanases indicate that the distal regions of their active sites are quite different, suggesting that the topology of the substrate binding clefts of these enzymes may vary. To test this hypothesis, we have investigated the rate and pattern of xylooligosaccharide cleavage by the family 10 enzymes, Pseudomonas fluorescens subsp. cellulosa xylanase A (XYLA) and...
متن کاملBinding Affinity of Antibodies?
Although the switch process is frequently associated with affinity maturation, the constant region is not assumed to play a role in Ag–Ab binding. In the present work, we demonstrate that two clonally related human monoclonal Igs sharing identical V H and V L sequences, but expressing different isotypes (IgA1 k PER and IgG1 k PER ), bind tubulin with significantly different affinities. This dif...
متن کاملDiesterase activity and substrate binding in purple acid phosphatases.
Purple acid phosphatases (PAPs) are dinuclear monoesterases1,2 that are structurally diverse but with a conserved set of ligands to the Fe3+-M2+ metal centers (M2+ ) Fe, Zn, or Mn).3 The identity of the nucleophile and the substrate binding mode have been matters of controversy (Figure 1).1,3-5 In one proposal, substrate binds to the divalent metal and is attacked by a terminal Fe3+-bound hydro...
متن کاملManganese and Iron Binding to Human Transferrin
The characteristics of manganese and iron binding to human apotransferrin (apo-tf) have been investigated and compared in this study. Both metal ions were taken up by human apo-tf and formed complexes, with the maximum absorbances observed at 410 and 340 nm for manganese-transferrin (Mn-tf) and 465 nm for iron-transferrin (Fe-tf). Addition of manganese (1.5 µg/ml) to the reaction mixture contai...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: FEBS Journal
سال: 2011
ISSN: 1742-464X
DOI: 10.1111/j.1742-4658.2011.08023.x